WO2019148650A1 - Mold and method for using the mold to manufacture molded product - Google Patents

Abstract

A mold and a method for using the mold to manufacture a molded product. The mold comprises a first half mold (10). The first half mold (10) is provided with a first mold cavity surface (110). An annular sealing structure is provided on the first mold cavity surface (110). The first annular sealing structure comprises a first protrusion (111) and/or a first groove (112) used for sealing the area between the molded product and the first mold cavity surface (110). The product molded using the mold is of improved quality.

Description

Mold and method for preparing molded product using the same Technical field

The present disclosure relates to the field of mechanical processing, and in particular to a mold and a method of preparing a molded product using the mold.

Background technique

In resin lens casting, a step of curing a curable liquid (usually a polymerizable monomer) in a cavity formed between two mold halves is generally included.

The inventors have known a method of making a multilayer molded product, such as a multilayer resin lens, which casts a multilayer molded product in a mold having a first mold half and a second mold half, comprising the steps of:

Forming a first curable liquid in a first cavity formed between the first mold half and the second mold half to form a first layer of the multilayer molded product;

Separating the second mold half from the first layer of the multilayer molded product while leaving the first mold half unseparated from the first layer of the multilayer molded product (eg, all or a portion remains attached);

Forming a second cavity between the first mold half and the second mold half, the second mold cavity having a greater thickness than the first mold cavity to form outside of one side of the first layer of the multilayer molded product a cavity

Forming a second curable liquid in the second mold cavity (while also on the surface of the first layer of the molded product) to obtain a second layer of the first layer laminated composite molded product with the molded product;

Demolding to obtain a multilayer molded product.

Summary of the invention

The inventors have found that after the curable liquid is formed, the molded product has a volume shrinkage with respect to the original liquid, for example, an average shrinkage ratio of 1 to 10%. In the preparation of the multilayer molded product, the above shrinkage may cause a gap between the first layer of the molded product after molding and the edge of the first mold half, and then, when the second layer is applied to the surface of the first layer of the molded product When the liquid is solidified, the second curable liquid penetrates between the first layer of the molded product and the first mold half through the slit, that is, penetrates into the front surface of the first layer of the molded product, resulting in molding of the product. The front surface of the first layer is destroyed.

The present disclosure provides a mold including a first mold half having a first cavity surface, and a first annular seal structure on the first cavity surface.

The first annular seal structure includes a first projection and/or a first recess for sealing the area between the molded product and the first cavity face.

In some embodiments, the first annular sealing structure encloses an area of more than 50% of the first cavity face.

In some embodiments, the outer edge of the first annular sealing structure abuts the edge of the first cavity face.

In some embodiments, the first annular sealing structure is located at an end of the first cavity face.

In some embodiments, there is a gap between the outer edge of the first annular seal structure and the edge of the first cavity face.

In some embodiments, the direction of the first raised protrusion is parallel to the normal passing through the midpoint of the first cavity face.

In some embodiments, the direction in which the first groove is recessed is parallel to the normal passing through the midpoint of the first cavity face.

In some embodiments, the direction of the first raised protrusion is not parallel to the normal passing through the midpoint of the first cavity face.

In some embodiments, the direction in which the first groove is recessed is not parallel to the normal passing through the midpoint of the first cavity face.

In some embodiments, the angle between the outer side of at least a portion of the sidewall of the first projection and the outer side of the first cavity is an acute angle.

In some embodiments, the angle between the inner side of at least a portion of the sidewall of the first recess and the inner side of the first cavity face is an acute angle.

In some embodiments, the distance from the top of the first projection to the normal passing through the midpoint of the first cavity face is greater than the distance from the bottom of the first projection to the normal through the midpoint of the first cavity face.

In some embodiments, the distance of the notch of the first groove to the normal passing through the midpoint of the first cavity face is greater than the distance from the groove bottom of the first groove to the normal passing through the midpoint of the first cavity face.

In some embodiments, the generatrices of the sidewalls of the first protrusion are curved or polygonal.

In some embodiments, the generatrices of the sidewalls of the first groove are curved or polygonal.

In some embodiments, the third raised and/or third recess is disposed on the sidewall of the first projection.

In some embodiments, the third groove and/or the third groove are disposed on the sidewall of the first groove.

In some embodiments, the third projection or the third recess is circumferentially disposed on the sidewall of the first projection or first recess.

In some embodiments, the cross section of the first groove is stepped.

In some embodiments, the cross section of the first groove is V-shaped.

In some embodiments, the first annular seal structure is an annular snap seal structure for sealing a region between the molded product and the first cavity face and removably snapping the molded product into the first cavity On the surface.

In some embodiments, the first protrusion is used to mold a second groove on the molded product.

In some embodiments, the first groove is for molding a second protrusion on the molded product.

In some embodiments, the mold further includes a second mold half that can be clamped with the first mold half to define a first mold cavity therebetween.

In some embodiments, the second mold half can be clamped with the first mold half to define a second mold cavity therebetween, the second mold cavity having a greater thickness than the first mold cavity.

In some embodiments, the mold includes a first replaceable second mold half and a second replaceable second mold half;

The first replaceable second mold half and the second replaceable second mold half have second cavity faces (211, 220) of different shapes;

The first replaceable second mold half is moldable with the first mold half to define a first mold cavity therebetween;

The second replaceable second mold half can be clamped with the first mold half to define a second mold cavity therebetween.

In some embodiments, the mold further includes an engagement mold that engages the first mold half and the second mold half.

In some embodiments, the first groove is located at an end of the first cavity face. At this time, the grooved end surface of the first mold half and the inner side surface of the engaging mold form a groove.

In some embodiments, the mold is a casting mold.

Preferably, the mold is a multilayer body casting mold.

Preferably, the mold is an ophthalmic lens casting mold.

The present disclosure also provides a method of preparing a molded product using the mold of the present disclosure, the mold further comprising a second mold half, the second mold half being clamped with the first mold half to define a first mold cavity therebetween, the second half The mold is movable relative to the first mold half and is again clamped with the first mold half to define a second mold cavity therebetween; the method comprising the steps of:

Forming a first curable liquid in a first cavity formed by the first mold half and the second mold half to form a first layer of the multilayer molded product;

Separating the second mold half from the first layer of the multilayer molded product, leaving the first mold half unseparated from the first layer of the multilayer molded product (eg, all or a portion remains connected);

Forming a second cavity between the first mold half and the second mold half, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of the molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

The present disclosure also provides a method of preparing a molded product using the mold of the present disclosure, the mold further comprising a first replaceable second mold half and a second replaceable second mold half, the first replaceable second mold half and the first half The mold is closed to define a first mold cavity therebetween, and the second replaceable second mold half is closed with the first mold half to define a second mold cavity therebetween; the method comprising the steps of:

Forming a first curable liquid in a first mold cavity formed by the first mold half and the first replaceable second mold half to form a first layer of the multilayer molded product;

Separating the first replaceable second mold half from the first layer of the multilayer molded product, leaving the first mold half unseparated from the first layer of the multilayer molded product (eg, all or partially remaining connected);

Forming a second cavity between the first mold half and the second replaceable second mold half, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of the molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

The present disclosure also provides a molded product obtained by molding the mold of the present disclosure.

In some embodiments, the molded product is a layered body.

In some embodiments, the molded product is a multilayer body.

In some embodiments, the molded product is transparent.

In some embodiments, the molded product is made of plastic, glass or metal.

In some embodiments, the molded product is a transparent optical body.

In some embodiments, the molded product is a lens.

In some embodiments, the molded product is an ophthalmic lens.

In some embodiments, the molded product is a multilayer lens.

In some embodiments, the molded product contains a dye.

In some embodiments, at least one layer of the multilayer body contains a dye.

In some embodiments, the dye is a photochromic dye.

In some embodiments, the ophthalmic lens is a contact lens or a non-contact lens.

In some embodiments, the molded product is a multilayer ophthalmic lens, the first layer of the multi-layer ophthalmic lens is a flat lens layer, the second layer is a refractive lens layer, the flat lens layer contains a dye, and the refractive lens layer does not Contains dyes.

The disclosed mold or method of making a molded product has one or more of the following beneficial or unexpected effects:

1) Low mold cost;

2) The mold structure is simple;

3) The mold has less variation than the conventional mold;

4) The mold is durable and not easily damaged;

5) The mold is used to prepare the molded product, and the yield is high;

6) The mold is used for preparing the molded product, and the operation is simple;

7) The mold is used to prepare a molded product, which is easy to industrialize.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the present disclosure, which is a part of the present disclosure, and the description of the present disclosure and the description thereof are not intended to limit the disclosure. In the drawing:

Figure 1 is a schematic cross-sectional view of a mold;

2 is a top plan view of a first cavity surface of a first mold half;

Figure 3 is a schematic cross-sectional view of another mold;

Figure 4 is a schematic cross-sectional view of another mold;

Figure 5 is a partial cross-sectional view of another mold;

Figure 6 is a partial cross-sectional view of another mold;

Figure 7 is a schematic cross-sectional view of another mold

Figure 8 is a schematic cross-sectional view of the mold of Comparative Example 1;

Figure 9 is a partial cross-sectional view showing another mold;

Figure 10 is a partial cross-sectional view showing another mold;

Figure 11 is a schematic view of a multilayer molded product;

Figure 12 is a schematic view showing the cross-sectional shape of some first grooves

Figure 13 is a schematic cross-sectional view of another mold;

Figure 14 is a schematic cross-sectional view showing a mold and a first layer of the multilayer lens thereof;

Figure 15 is a schematic cross-sectional view of still another mold and a first layer of the multilayer lens therein.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, however, the following examples are intended to illustrate the invention and are not intended to limit the scope of the invention.

As used herein (herein), "around", "about" or "approximately" generally mean within 20% of the deviation of a given value or range, preferably within 10%, more preferably 5%. Within the deviation. The quantities given herein are approximations that imply the terms "left and right", "about" or "approximately" (if such terms are not explicitly stated).

Likewise, the use of "a" or "an" This is for the sake of brevity and the general meaning of the present disclosure. This description should be understood to include one or at least one, and the singular includes plural.

It should be understood that the terms "midpoint", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" Orientation or positional relationship of the indications of "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or The components must have a particular orientation, construction and operation for a particular orientation, and thus are not to be construed as limiting the scope of the invention.

In some embodiments, "snap-on" refers to a state in which a component can be snapped rather than always stuck. For example, when a small pulling force is applied (for example, when separating the second mold half and the first layer of the molded product), the first layer of the molded product can be kept with the resulting first mold half. The first layer of the molded product and the resulting first mold half can be detached from the snap when a large pulling force is applied (when demolding is completed after the multi-layer molded product is cured).

In one embodiment, "cavity" refers to the space in the mold used to form the molded product.

In some embodiments, the "cavity face" is the face of the mold that is in contact with the molded product.

In some embodiments, "first cavity face" refers to the cavity face of the first mold half.

In some embodiments, "second cavity face" refers to the cavity face of the second mold half.

In some embodiments, "annular" refers to a pattern that meets end to end in a week. The ring is circular. The ring can be any closed figure, such as an elliptical triangle, a quad, a regular or an irregular polygon. The ring is not limited to a ring on the plane, but may also be a ring on the surface. The ring may also be a non-closed pattern, for example one or more discontinuities may be provided on the ring, the total length of the discontinuities is < 0.05 L, and L is the circumference of the ring. Alternatively, the length of the discontinuity is ≤ 5 mm, for example ≤ 2 mm.

In some embodiments, a "snap groove" means a groove in which a structure is interlocked with another structure (e.g., a snap-on protrusion) to form an interlock, snap, accept, or a combination of the above various combinations.

In some embodiments, a "snap bump" refers to a protrusion that extends from a structure and is inserted, interlocked, card inserted, placed into another structure (eg, a snap groove), or received by another structure. Start.

In some embodiments, "sealing" refers to the area of the molded product and the first cavity face that is substantially impermeable to the liquid, enclosed by the first annular sealing structure. For example, when using a mold to prepare a multilayer body, when the residue rate due to sealing failure is less than 50%, it may be 40% or less, 30% or less, 20% or less, and 10% or less. Choose 5% or less, select 1% or less, and select 0.1% or less, indicating that the sealing effect is achieved.

In some embodiments, "forming" means curing or semi-curing, i.e., capable of maintaining its shape from flowing or collapsing, and the shaped product may be solid or semi-solid.

In some embodiments, a "mold" is a "mold set" that includes a plurality of "mold parts."

In some embodiments, as shown in FIG. 4, "thickness of the cavity" refers to the distance from the midpoint (A) of the first cavity face 110 to the second cavity face 210.

In some embodiments, the distance between object A and object B refers to the shortest distance from object A to object B.

In some embodiments, "the first layer of molded product" refers to a molded product that is formed on the first cavity face.

In some embodiments, the outer side of the side wall refers to the side of the side wall that faces the free space, and the inner side of the side wall refers to the side of the side wall and the side facing away from the free space.

In some embodiments, the depth of the first groove refers to the distance from the bottom of the groove to the first cavity face.

In some embodiments, the height of the first protrusion refers to the distance from the top of the protrusion to the first cavity face.

Figure 1 is a schematic cross-sectional view of a mold. 2 is a top plan view of a first cavity surface of a first mold half. Figure 3 is a schematic cross-sectional view of yet another mold. Figure 4 is a schematic cross-sectional view of yet another mold. As shown in Figures 1-4, the present disclosure provides a mold comprising a first mold half (10) having a first mold cavity surface (110), the first mold cavity surface (110) is provided with a first annular sealing structure, the first annular sealing structure comprising a first protrusion (111) and/or a first groove (112) for molding the molded product and the first cavity surface The area between 110 (e.g., the area enclosed by the first annular seal structure) is sealed.

As shown in Figures 1 and 2, the first annular seal structure includes a first projection 111.

In some embodiments, the first annular sealing structure includes an annular first projection.

As shown in Figures 3 and 4, the first annular seal structure includes a first recess 112.

In some embodiments, the first annular seal structure includes an annular first groove.

The inventors have found that when the above mold is used to prepare a multilayer molded product, there is no second curable liquid flowing between the first layer and the first mold half of the molded product (for example, the first projection or the first concave The case where the groove is enclosed.

Without being bound by theory, the first annular seal structure includes a first protrusion 111 for molding a second groove that is in sealing engagement with the first protrusion 111 on the molded product. The first protrusion 111 is sealingly engaged with the second groove to block the flow of the second curable liquid between the first layer and the first mold half of the molded product.

Further, if the molded product has a volume shrinkage after molding, the shrinkage further causes the contact surface of the first protrusion 111 and the second groove to be pressed, thereby enhancing the seal between the first protrusion 111 and the second groove. The compounding, in turn, more effectively blocks the flow of the second curable liquid between the first layer of the molded product and the first mold half (especially the area enclosed by the first projections). Based on this, the above mold can obtain a high quality multilayer molded product.

Without being bound by theory, the first annular seal structure includes a first recess 112 for correspondingly molding a second sealing fit with the first recess 112 on the first layer of molded product Raised. The first recess 112 is sealingly engaged with the second projection to block the flow of the second curable liquid between the first layer and the first mold half of the molded product.

Further, if the molded product has a volume contraction during molding, the shrinkage further causes the contact surface of the first groove 112 and the second protrusion to be pressed, thereby enhancing the sealing fit between the first groove 112 and the second protrusion. Further, it is more effective to block the flow of the second curable liquid between the first layer of the molded product and the first mold half (especially the area enclosed by the first groove). Based on this, the above mold can obtain a high quality multilayer molded product.

In some embodiments, the first annular sealing structure is an annular first projection 111.

In some embodiments, the first annular seal structure is an annular first groove 112.

In some embodiments, the first annular sealing structure encloses an area of 50% or more of the first cavity surface, an area of 60% or more, an area of 70% or more, an area of 80% or more, for example, an area of 90% or more, for example More than 95% of the area, such as more than 99% of the area. Based on this, it is possible to make the molded product have a large high quality area.

As shown in Figure 4, in some embodiments, the outer edge of the first annular sealing structure abuts the edge of the first cavity face (110). Based on this, the molded product can have a large high quality area, and the preparation of the mold is relatively easy.

As shown in Figures 1 and 3, in some embodiments, the outer edge of the first annular sealing structure is spaced from the edge of the first cavity face (110). In some embodiments, the first annular seal structure is spaced from the edge of the first cavity face 110 by 0.1 to 10 mm, such as 1, 2, 3, 4, 5, 6, 7, 8, or 9 mm. Based on this, the durability of the mold is better.

As shown in FIGS. 1, 3 and 4, in some embodiments, the direction in which the first protrusion 111 is convex or the direction in which the first groove 112 is recessed is parallel to the normal passing through the point A in the first cavity surface 110. . Based on this, it is relatively easy to obtain a mold, and the cost of the mold is low. Demolding is also easier when the stripping direction is parallel to the normal passing through the midpoint of the first cavity face 110.

In some embodiments, the first annular seal structure is a first annular snap seal structure for sealing a region between the molded product and the first cavity face 110 and molding The product is detachably snapped onto the first cavity surface. The snap-on sealing structure can prevent the molded product from being detached from the first cavity surface or the seal failure due to volume shrinkage during molding of the molded product. Additionally, the annular snap-on sealing structure also prevents the first layer of the molded product from separating from the first mold half 10 when the second mold half is separated from the first layer of the molded product.

In some embodiments, the snap-fit structure is an annular snap-on structure, a cantilever snap-fit structure, or a twist-and-kick structure.

In some embodiments, the first annular sealing structure is an annular snap-on sealing structure by providing a convex direction of the first protrusion 111 or a concave direction of the first groove 112.

In some embodiments, the direction in which the first protrusions 111 are convex is not parallel to the normal passing through the midpoint of the first cavity face 110. In some embodiments, the direction in which the first groove 112 is recessed is not parallel to the normal passing through the midpoint of the first cavity face 110. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, the distance from the top of the first protrusion 111 to the normal passing through the midpoint A of the first cavity face is greater than the bottom of the first protrusion 111 to the point A through the midpoint of the first cavity face. The distance of the line. In some embodiments, the distance from the notch of the first groove 112 to the normal of the point A in the first cavity surface is greater than the groove bottom of the first groove 112 to pass through the midpoint of the first cavity face The distance of the normal. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, an angle between an outer side of at least a portion of the side wall of the first protrusion 111 and an outer side of the first cavity surface 110 is an acute angle. In some embodiments, an angle between an inner side of at least a portion of the sidewall of the first recess 112 and an inner side of the first cavity surface 110 is an acute angle. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, the first annular sealing structure is detachably snap-fitted to the molded product by providing the shape of the first projection 111 or the first recess 112.

As shown in FIG. 9, in some embodiments, a third groove 113 is disposed on a sidewall of the first groove 112. In some embodiments, a third protrusion or a third groove 113 is disposed on a sidewall of the first protrusion 111 or the first groove 112. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, the third protrusion or third groove 113 is circumferentially disposed on the sidewall of the first protrusion 111 or the first groove 112. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, the bus bars of the first protrusions 111 and/or the sidewalls of the first grooves 112 are curved or polygonal lines. Based on this, the first annular sealing structure removably snaps over the molded product.

As shown in FIG. 5, in some embodiments, the bus bars 121 of the sidewalls of the first recess 112 are fold lines. As shown in FIG. 6, in some embodiments, the bus bars 121 of the sidewalls of the first recess 112 are curved. Based on this, the first annular sealing structure removably snaps over the molded product.

In some embodiments, the height of the first protrusion 111 or the third protrusion is 0.1 mm or more, such as 0.1 to 10 mm, such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or 9 mm.

In some embodiments, the first groove 112 or the third groove 113 has a depth of 0.1 mm or more, such as 0.1 to 10 mm, such as 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or 9 mm.

In some embodiments, the first protrusion 111, the third protrusion, the first groove 112, and the third groove 113 have a cross-sectional width of 0.1 to 5 mm, such as 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, or 4 mm. .

In some embodiments, the aspect ratio (ratio of height to cross-sectional width) of the first protrusions 111 or the third protrusions is 0.1 to 10, such as 0.1 to 1, such as 1 to 10, such as 0.2 to 8, such as 0.3. ～7, for example, 0.4 to 6, for example, 0.5 to 5, for example, 0.6 to 4, for example, 0.7 to 3, for example, 0.8 to 2, for example, 0.9 to 1.

In some embodiments, the aspect ratio (ratio of depth to cross-sectional width) of the first groove 112 or the third groove 113 is 0.1 to 10. For example, 0.1 to 1, for example 1 to 10, for example 0.2 to 8, for example 0.3 to 7, for example 0.4 to 6, for example 0.5 to 5, for example 0.6 to 4, for example 0.7 to 3, for example 0.8 to 2, for example 0.9 to 1 .

In some embodiments, the first protrusions 111 and/or the third protrusions are snap-fit protrusions.

In some embodiments, the first groove 112 and/or the third groove 113 are snap grooves.

In some embodiments, after the first layer of the multilayer molded product is formed, the first protrusions 111 and/or the first grooves 112 of the first mold half 10 form a concave-convex fit with the first layer of the multilayer molded product. .

In some embodiments, after the first layer of the multilayer molded product is formed, the first protrusions 111 and/or the first grooves 112 of the first mold half 10 are engaged with the first layer of the multilayer molded product. Concave fit.

In some embodiments, after the first layer of the multilayer molded product is formed, the first protrusions 111 of the first mold half 10 and/or the first grooves 112 are in contact with the first layer of the multilayer molded product. Press tight.

In some embodiments, the first protrusion 111 is detachably snap-fitted with the second groove.

In some embodiments, the first groove 112 is detachably snap-fitted with the second protrusion.

As shown in FIG. 4, in some embodiments, the first groove 112 is a stepped groove. The mold based on this is lower in cost, that is, the cost of preparing the mold is lower.

In some embodiments, the cross section of the first groove 112 is L-shaped. The mold based on this is lower in cost, that is, the cost of preparing the mold is lower.

In some embodiments, the mold further includes a second mold half 20 that, after being clamped with the first mold half 10, defines a mold cavity therebetween.

In some embodiments, the second mold half 20 is capable of clamping the first mold half 10 at a first distance from the first mold half 10 and defining a first mold cavity therebetween; the second mold half 20 is also capable of The first mold half 10 is clamped at a second distance from the first mold half 10 and defines a second mold cavity therebetween.

In some embodiments, the "first distance" and the "second distance" between the second mold half 20 and the first mold half 10 are the distance from the midpoint (A) of the first cavity surface to the second cavity surface. meter.

In some embodiments, the first mold cavity and the second mold cavity have different thicknesses.

In some embodiments, the mold includes a plurality of second mold halves 20 of different shapes.

In some embodiments, the mold includes a plurality of replaceable second mold halves having second mold cavities of different shapes.

In some embodiments, the second mold half includes a first replaceable second mold half 21 and a second replaceable second mold half 22.

As shown in FIG. 7, in some embodiments, the mold includes a first replaceable second mold half 21 and a second replaceable second mold half 22, the first replaceable second mold half 21 and the The second replaceable second mold half 22 has second cavity faces (211, 220) of different shapes;

The first replaceable second mold half 21 can be clamped with the first mold half 10 to define a first mold cavity therebetween;

The second replaceable second mold half 22 can be clamped with the first mold half 10 to define a second mold cavity therebetween. Based on this, the first layer of the molded product and the second layer of the molded product can have surfaces of different curvatures.

The present disclosure provides a mold including a second mold half 20.

As shown in FIG. 10, in some embodiments, the intersection of the end face of the second mold half 20 (e.g., the first replaceable second mold half) with the second mold cavity face is chamfered 201. Based on this, it is helpful to separate the second mold half (for example the first replaceable second mold half) from the first layer of the molded product.

In some embodiments, the second cavity face of the second mold half is convex.

In some embodiments, the chamfer is a circular chamfer or a bevel chamfer.

In some embodiments, the outside of the chamfered surface is at an angle <90 degrees to the outside of the inner surface of the engagement die, such as < 75 degrees, such as < 60 degrees, such as < 45 degrees, such as < 30 degrees.

In some embodiments, the molded product is a multilayer lens, the first layer of the multilayer lens may be a flat lens layer (zero diopter), and the second layer of the multilayer lens may be a refractive lens layer (the diopter is not zero, ie Greater than zero or less than zero). In some embodiments, the second mold half 20 has a second cavity face 210.

In some embodiments, after the mold is clamped, the first cavity face 110 faces the second cavity face 210.

In some embodiments, the shape of the first mold cavity and/or the second mold cavity is layered.

In some embodiments, the first cavity face and the second cavity face are each independently planar or curved.

In some embodiments, the curved surface is a concave curved surface or a convex curved surface.

In some embodiments, the area of the first annular seal member is removed, and the other regions of the first cavity face 110 are continuous curved surfaces.

In some embodiments, the first cavity face is a concave curved surface or a convex curved surface.

In some embodiments, the mold further includes an engagement die 30 that engages the first mold half 10 and the second mold half 20.

In some embodiments, the engagement die 30 engages the edges of the first mold half 10 and the second mold half 20.

In some embodiments, the engagement die 30 seals the cavity formed between the first mold half 10 and the second mold half 20.

In some embodiments, the engagement mold 30 is in the form of a plate, a strip, or a strip.

In some embodiments, the engagement die 30 is resilient.

In some embodiments, the engagement die 30 is tacky.

In some implementations, the engagement molds are detachably coupled to the first mold half and the second mold half, respectively.

In some embodiments, the engagement dies 30 are sealingly coupled to the first mold half and the second mold half, respectively.

In some embodiments, the engagement die 30 is a plastic ring or tape.

In some embodiments, the plastic ring is resilient. Based on this, the first mold half and the second mold half can be better sealed.

In some embodiments, the tape is viscous. Based on this, the first mold half and the second mold half can be better sealed.

In some embodiments, the first mold half 10, the second mold half 20, and the engagement mold 30 are clamped to form a mold cavity.

In some embodiments, the mold includes a first engagement mold and a second engagement mold. The first engagement die has a different width than the second engagement die. The first mold half, the second mold half and the first engagement mold are enclosed to form a first mold cavity. The first mold half, the second mold half and the second engagement mold are enclosed to form a second mold cavity.

In some embodiments, the engagement die 30 is provided with a first fixed position of the mold and a second fixed position of the mold. The first mold half and the second mold half are disposed on the first mold fixing position of the joint mold 30, and the three are enclosed to form the first mold cavity. The first mold half and the second mold half are disposed on the mold fixing position of the second pitch of the joining mold, and the three are enclosed to form the second mold cavity.

In some embodiments, the raw material injection port of the mold is located between the first mold half and the second mold half.

In some embodiments, the raw material injection port of the mold is located on the joining die 30.

In some embodiments, the mold includes a support that maintains a spacing between the first mold half and the second mold half after the mold is clamped.

In some embodiments, the mold includes a first support and a second support, the first support maintaining a first spacing between the first mold half and the second mold half after the mold is clamped, the second support being in the mold After clamping, the second half is maintained between the first mold half and the second mold half. The first support or the second support may be selected as needed.

In some embodiments, the first protrusion 111 extends into a mold cavity (eg, a first mold cavity).

In some embodiments, the first groove 112 is in communication with a mold cavity (eg, a first mold cavity).

In some embodiments, the first cavity face 110 is provided with one or more first protrusions 111 and/or one or more first grooves 112.

In some embodiments, the first protrusion 111 is in full conformity with the first cavity face 110.

In some embodiments, the shape of the path of the first protrusion 111 or the first groove 112 along the first cavity face 110 may include a semicircle, a U-shape, an ellipse, a triangle, a rectangle, a pentagon, and Other polygons.

In some embodiments, the first mold half 10 includes a plurality of mold assemblies. Optionally, a plurality of mold assemblies are detachably coupled.

In some embodiments, the second mold half 20 includes a plurality of mold assemblies. Optionally, a plurality of mold assemblies are detachably coupled.

In some embodiments, the mold is a casting mold.

In some embodiments, the mold is a lens mold.

In some embodiments, the mold is an ophthalmic lens mold.

In some embodiments, the material of the mold includes one or more of the following: plastic, metal, glass.

In some embodiments, the surface of the mold is coated with one or more of the following coatings: coatings that improve mold release properties, coatings that improve mold durability, and coatings that improve lens quality.

Yet another aspect of the present disclosure provides a method of casting a molded product using the mold of the present disclosure.

The mold used in the method further includes a second mold half 20 capable of clamping the first mold half 10 at a first distance from the first mold half 10 and defining a first mold cavity therebetween The mold halves 20 are also capable of clamping the first mold half 10 at a second distance from the first mold half 10 and defining a second mold cavity therebetween; the method comprising the steps of:

Forming a first curable liquid in a first cavity formed by the first mold half (10) and the second mold half (20) to form a first layer of the multilayer molded product;

Separating the second mold half from the first layer of the multilayer molded product, leaving the first mold half unseparated from the first layer of the multilayer molded product (eg, all or a portion remains connected);

Forming a second cavity between the first mold half and the second mold half, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

In some embodiments, the method of making a molded product further includes the step of replacing a second mold half of a different shape, forming a second mold cavity between the first mold half and the second mold half.

As shown in Figure 7, a further aspect of the present disclosure provides a method of casting a molded product using the mold of the present disclosure.

The mold used in the method further includes a first replaceable second mold half 21 and a second replaceable second mold half 22, the first replaceable second mold half 21 being clamped with the first mold half 10 to A first mold cavity is defined therebetween, and the second replaceable second mold half 22 is clamped with the first mold half 10 to define a second mold cavity therebetween; the method comprising the steps of:

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the first replaceable second mold half 21 to form a first layer of the multilayer molded product;

Separating the first replaceable second mold half 21 from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product, for example, all or a portion remains connected;

Forming a second cavity between the first mold half 10 and the second replaceable second mold half 21, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

In some embodiments, the curable liquid includes a curable liquid capable of obtaining a thermosetting resin or a curable liquid capable of obtaining a thermoplastic resin.

In one embodiment, the curable liquid capable of obtaining a thermosetting resin includes one or more of the following materials: MR ^TM series materials sold by Mitsui Chemicals, Inc., such as MR-8, MR-7, MR-10 or MR- 174; KOC55, KY55, KA50, KOC-55-I, KT60, KOC60S, KOC6420, KT67 or KT70 of KOC Solution; CR-39 of PPG; UNO-Magic A1 of UNO-Chemical, UNO-Magic A5, UNO -Magic A6.

In some embodiments, the curable liquid used to prepare the molded product includes one or more of the following: a molten resin, a resin monomer.

In some embodiments, the curable liquid used to prepare the molded product includes a resin monomer such as a polyol and a diisocyanate.

In some embodiments, forming refers to a liquid state transition to a semi-solid or solid state.

Yet another aspect of the present disclosure provides a molded product made from the mold of the present disclosure.

In some embodiments, the molded product is a layered body.

In some embodiments, the molded product is a multilayer body.

In some embodiments, the molded product is transparent.

In some embodiments, the molded product is made of plastic, glass or metal.

In some embodiments, the molded product is a lens.

In some embodiments, the molded product is a multilayer lens.

In some embodiments, the molded product is an ophthalmic lens.

In some embodiments, the molded product is a transparent optical body.

In some embodiments, the molded product contains a dye.

In some embodiments, at least one layer of the multilayer body contains a dye.

In some embodiments, the dye is a photochromic dye.

In some embodiments, the ophthalmic lens is a contact lens or a non-contact lens.

The present disclosure also provides a molded product obtained by the preparation of any of the methods of the present disclosure.

In some embodiments, the cross section of the first groove 112 is any one of i to vii shown in FIG.

In some embodiments, when the cross-sectional shape of the groove is a V-shape, the depth of the groove is preferably 1 mm or more, such as 1.5 mm or more, for example, 2 mm or more.

In some embodiments, the first groove refers to a space disposed on the first mold half that is lower than the first cavity face 110.

In some embodiments, the first protrusion refers to a mold body disposed on the first mold half that is higher than the first mold cavity surface 110.

In some embodiments, when the first groove 112 is located at the edge of the first mold half, the sidewall of the first groove 112 is enclosed by the first mold half 10 and the interface film 30.

In some embodiments, the boundary edge of the first cavity face 110 and the end face 120 of the first mold half 10 is provided with a chamfered face 130. The space formed by the chamfered surface 130 on the first mold half lower than the first mold cavity 110 is the first recess 112. The chamfered surface 130 constitutes a portion of the side wall of the first recess 112, and the engaging die 30 can constitute another portion of the side wall of the first recess 112.

In some embodiments, the first groove 112 is located at the junction of the first mold half 10 and the engagement die 30.

In some embodiments, the engagement die 30 is an adhesive tape with a viscous layer on one side of the tape.

In some embodiments, the engagement mold 30 is an apron, ie, an elastic plastic ring. The apron includes an endless belt and an annular projection disposed on an inner side surface of the endless belt. The endless belt is used to engage the first mold half and the second mold half, and the annular projection is used to extend between the first mold half and the second mold half to maintain the distance therebetween.

In some embodiments, the mold further includes an engagement mold.

In some embodiments, the engagement mold is an endless belt.

In some embodiments, the inner sidewall of the engagement mold has a viscous layer. The viscous layer is used to receive the connected objects more tightly and more stably.

In some embodiments, the inner side wall of the engagement mold is provided with an annular projection along the length of the engagement die for maintaining the spacing between the first mold half and the second mold half. The adapter can be used with a clamp.

In some embodiments, the engagement mold includes a first portion of the engagement mold and a second portion of the engagement mold, the first portion of the engagement mold is for engaging the first mold half with the molded product, and the second portion of the engagement mold is for engaging the second portion. Semi-molded and molded products.

In some embodiments, the mold further includes a clamp for clamping the first and second mold halves after the mold clamping.

In some embodiments, in the method of the present invention for casting a molded product, the mold further includes an engagement die 30, the engagement die 30 engaging the first mold half 10 and the second mold half;

The method includes the following steps:

The first mold half 10 and the second mold half 20 are clamped, and the gap between the first mold half 10 and the edge of the second mold half 20 is formed by the joint mold 30 to form a first mold cavity;

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the second mold half 20 to form a first layer of the multilayer molded product;

The splicing die 30 is divided into a first portion 301 of the splicing die and a second portion 302 of the splicing die, the first portion 301 of the splicing die 30 is a portion of the first dies 10 and the first layer of the multi-layer molded product. The second portion 302 of the joining die refers to the portion of the joining die 30 that engages the second mold half 20 and the second layer of the multilayer molded product, and separates the second portion 302 of the joining die from the mold while maintaining the first portion of the joining die 301 is connected to the first layer and the first mold half of the multilayer molded product;

Separating the second mold half 20 from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product, for example, all or a portion remains connected;

Forming a second cavity between the first mold half 10 and the second mold half 20, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

In some embodiments, in the method of the present invention for casting a molded product, the mold further includes an engagement mold 30 that engages the first mold half 10 and the second mold half, the engagement mold 30 includes an engagement The first portion 301 of the mold and the second portion 302 of the connecting mold, the first portion 301 of the joining mold is used for engaging the first mold half 20 and the molded product, and the second portion 302 of the joining mold is used for engaging the second mold half 10 and the mold Product

The method includes the following steps:

The first mold half 10 and the second mold half 20 are clamped, and the gap between the first mold half 10 and the edge of the second mold half 20 is sealed by the joint mold 30 to form a first mold cavity;

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the second mold half 20 to form a first layer of the multilayer molded product;

Separating the second portion 302 of the joining mold from the mold while maintaining the connection of the first portion 301 of the joining mold to the first layer and the first mold half of the multilayer molded product;

Separating the second mold half 20 from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product, for example, all or a portion remains connected;

Forming a second cavity between the first mold half 10 and the second mold half 20, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

In some embodiments, in the method of the present invention for casting a molded product, the mold further includes an engagement die 30 that engages the first mold half 10 and the second mold half, the inside of the engagement mold 30 The wall is provided with an annular protrusion along the length direction of the engaging die for maintaining the spacing between the first mold half 10 and the second mold half 20;

The mold further includes a clamp 60 for clamping the first mold half and the second mold half after the mold clamping;

The method includes the following steps:

The first mold half 10 and the second mold half 20 are clamped, and the gap between the first mold half 10 and the edge of the second mold half 20 is sealed by the joint mold 30 to form a first mold cavity;

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the second mold half 20 to form a first layer of the multilayer molded product;

Separating the second mold half 20 from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product, for example, all or a portion remains connected;

Forming a second cavity between the first mold half 10 and the second mold half 20, the second mold cavity having a greater thickness than the first mold cavity, and engaging the first mold half 10 and the second mold half with the engagement mold 30 20, the protrusion of the engagement die is located between the second mold half 20 and the first layer of the multilayer molded product, maintaining the spacing between the second mold half 20 and the first mold half 20, and the first The mold half 10 and the second mold half 20 are clamped toward each other;

Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product;

Demolding to obtain a multilayer molded product.

In some embodiments, the method of the present invention casts a molded product, between forming a second layer of the molded product and the demolding step, further comprising laminating one or more layers on the second layer of the molded product step.

The method of the present disclosure can not only cast two layers of molded products, but also cast three or more layers of molded products. The method of the present disclosure can also adjust the number of layers of the molded product, adjusting the composition, shape and properties of each layer, for example, to a preset value.

In some embodiments, after forming the second layer of the molded product laminated with the first layer of the molded product, before demolding, the method further comprises the steps of: heating the mold and the multilayer molded product therein to make The layer molded product becomes soft and the first mold half and the multilayer molded product are separated. The heating temperature may be 80 ° C or higher, for example, 80 to 120 ° (for example, 90 to 110 ° C). Based on this, since the heated multilayer lens is soft, it is not easy to cause the groove structure of the first mold half to be broken during separation.

The first annular seal structure is used to seal the area between the molded product and the first cavity face 110. Sealing herein means preventing liquid material from flowing between the molded product and the first cavity face.

In some embodiments, the first annular sealing structure includes an annular first projection.

In some embodiments, the annular first protrusion is continuous.

In some embodiments, one or more discontinuities may be provided on the annular first projection. The total length of the intermittent e.g. less than 0.05L _1, another example less than 0.03L _1, L ₁ is the perimeter of the first annular protrusion.

In some embodiments, the first annular seal structure includes a continuous annular first groove.

In some embodiments, one or more discontinuities may be provided on the first groove of the ring. The total length of the intermittent e.g. less than 0.05L _2, another example less than 0.03L _2, L ₂ is the perimeter of the second annular recess.

In some embodiments, for a case where only one discontinuity is provided, the total length of the discontinuity is the length of the discontinuity; for the case where a plurality of discontinuities are provided, the total length of the discontinuity is the sum of the lengths of the plurality of discontinuities.

In some embodiments, the length of the discontinuity refers to the length of the discontinuity along the annular path.

Specific embodiment

The mold of the present disclosure and a method of preparing the multilayer body using the same are further explained below by way of specific examples.

Example 1

Fig. 9 is a partial cross-sectional view showing the mold of the first embodiment. As shown in Fig. 9, a first groove 112 having a depth of 1.5 mm was provided at the edge of the first mold half 10 of the mold of Example 1. The first groove 112 has a minimum cross-sectional width of 0.2 mm and a maximum cross-sectional width of 0.7 mm. On the side wall of the first groove 112, at a position against the bottom of the groove, there is a third groove 113 having a depth of 0.5 mm and a width of 0.6 mm, and the first groove 112 has a 45° chamfer at the edge of the groove. .

In addition to the structure of the first mold half 10 shown in FIG. 9, the other mold assembly of Embodiment 1 basically refers to FIG. 7, that is, further includes a first replaceable second mold half 21, a second replaceable mold half 22, and an engagement mold. 30. The engagement die 30 engages the edge 22 of the first mold half 10 and the first replaceable second mold half 21 or the second replaceable mold half. The first replaceable second mold half 21 and the second replaceable second mold half 22 have second cavity faces (211, 220) of different shapes. The first replaceable second mold half 21 can be clamped with the first mold half 10 to define a first mold cavity therebetween; the second replaceable second mold half 22 can be clamped with the first mold half 10 so as to be in them A second mold cavity is defined therebetween.

Figure 11 shows a schematic of a multilayer lens. The multilayer lens 40 includes a laminated composite multilayered first layer 41 and a multilayered lensed second layer 42.

The specific method for preparing the above multilayer lens 40 of Embodiment 1 includes:

The first mold half 10 is clamped with the first replaceable second mold half 21 to form a first mold cavity, and the first curable liquid is injected into the first mold cavity.

The first curable liquid includes: curable resin raw material KT60 (purchased from KOC solution company in Korea), 0.5% dye Oracet Black 007 (purchased from BASF company), curing agent DC (dibutyltin dichloride dibutyltin dichloride), purchased From KOC solution, UV absorber UV-31 (purchased from KOC solution) and release agent UB67 (purchased from KOC solution). KT-60 is a monomer raw material for thermosetting resin polyurethane.

The following first heating procedure is applied to the mold and the liquid therein:

First heating procedure: 120 degrees Celsius 120 minutes, 30-40 degrees Celsius 330 minutes, 40-50 degrees Celsius 180 minutes, 50-65 degrees Celsius 120 minutes, 65-95 degrees Celsius 180 minutes, 95-110 degrees Celsius 60 minutes, 110 degrees Celsius for 120 minutes Cool down from 110 degrees to 70 degrees in 60 minutes and cool to room temperature.

After the first heating procedure, the raw material in the mold is partially cured to obtain a first layer of the semi-solid multilayer lens. Separating the first replaceable second mold half 21 from the first layer of the semi-solid multilayer lens while maintaining the first mold half 10 unseparated from the first layer of the semi-solid multilayer lens (eg, all or part of the connection remains) .

Forming a second cavity between the first mold half 10 and the second replaceable second mold half 22, the second mold cavity having a greater thickness than the first mold cavity, thereby forming a first layer 41 of the multilayer lens A layered cavity is formed outside the side. The second curable liquid is injected into the second mold cavity.

The second curable liquid includes: a curable resin solution KT60 (purchased from KOC solution, Korea), a curing agent DC (dibutyltin dichloride dibutyltin dichloride, purchased from KOC solution), and an ultraviolet absorber UV-31 (from KOC solution company purchased) and release agent UB67 (purchased from KOC solution company).

The following second heating procedure is performed on the mold and the multilayered first layer and the second curable liquid therein:

Second heating procedure: 30 degrees Celsius 120 minutes, 30-40 degrees Celsius 330 minutes, 40-50 degrees Celsius 180 minutes, 50-65 degrees Celsius 120 minutes, 65-95 degrees Celsius 180 minutes, 95-120 degrees Celsius 60 minutes, 120 degrees Celsius for 120 minutes It was cooled from 120 degrees to 70 degrees in 60 minutes and cooled to room temperature.

After the second heating process, the first layer 41 of the multilayer lens and the second layer 42 of the multilayer lens are fully cured and laminated to form a multilayer lens 40. The first resin solid layer 41 and the second resin solid layer 42 are connected by a chemical bond. The chemical bond connecting the first solid layer 41 and the second resin solid layer 42 is the same as the chemical bond inside the first resin solid layer 41 (or the chemical bond inside the second resin solid layer 42).

The first layer 41 of the multilayer lens has a thickness of 1.0 mm, a diameter of 78 mm, and a curvature of 500 (Base Curve); the second layer 42 of the multilayer lens has a thickness of 3 mm, a diameter of 75 mm, and a curvature of 500 curves (Base Curve).

20 multilayer lenses were prepared by the method of Example 1, and the yield was 100%.

Example 2

The mold of Embodiment 2 is substantially the same as Embodiment 1, except that the first mold half 10 of the mold of Embodiment 2 is as shown in FIG. 4, wherein the first groove 112 is located at the edge of the first mold half 10. Step slot. The step groove has a depth of 2 mm and a width of 0.8 mm.

The engaging die 30 of Embodiment 2 is an adhesive tape, that is, an endless belt having an adhesive layer on the inner side wall.

In Example 2, the method of preparing the multilayer lens is as follows:

The first mold half 10 and the second mold half 20 are clamped, and the gap between the first mold half 10 and the edge of the second mold half 20 is sealed by the joint mold 30, that is, the tape, to form a first mold cavity;

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the second mold half 20 to form a first layer of the multilayer lens;

Prior to separating the second mold half 20 from the first layer of the multilayer lens, the joining mold 30 is separated by a new process. Figure 13 is a schematic cross-sectional view of a mold of Embodiment 2, and Figure 11 is a schematic view of a multilayer lens. Embodiment 2 The above engaging die 30 is the same as the engaging die 30 shown in FIG. As shown in FIGS. 11 and 13, the adapter die 30 (tape) is divided into a first portion 301 of the connecting die and a second portion 302 of the connecting die by a blade, and the first portion 301 of the engaging die is a connecting die that engages the first mold half 10 and the multilayer lens. The portion of the first layer 41, the second portion 302 of the connecting mold means that the engaging mold engages the portion of the second mold half 20 and the first layer 41 of the multilayer lens, and separates the second portion 302 of the joining mold from the mold while maintaining the engaging mold. The first portion 301 is connected to the first layer 41 of the molded product and the first mold half 10;

Separating the second mold half 20 from the first layer 41 of the multilayer lens, keeping the first mold half and the first layer of the multilayer lens unseparated, for example, all or part of the connection;

Forming a second cavity between the first mold half 10 and the second mold half 20, the second mold cavity having a greater thickness than the first mold cavity;

Forming a second curable liquid in the second mold cavity to form a second layer 42 of the multilayer lens laminated with the first layer 41 of the multilayer lens;

Demolding to obtain a multilayer lens.

Other steps not explicitly stated are referred to in Example 1.

20 multilayer lenses were prepared by the method of Example 2, and the yield was 100%.

Example 3

The mold of Embodiment 3 is basically the same as Embodiment 2 except that the first mold half 10 of Embodiment 3 is as shown in FIG. 13, wherein the first groove 112 is a V-shaped portion located at the edge of the first mold half 10. groove. The V-groove has a depth of 2 mm and a maximum width of 1.3 mm.

In Example 3, the method of preparing the multilayer lens was the same as in Example 2.

20 multilayer lenses were prepared by the method of Example 3, and the yield was 100%.

Example 4

Figure 14 is a schematic illustration of the mold of Example 4, i.e., the first layer of the multilayer lens therein. The mold of Example 4 is basically the same as that of Embodiment 2, except that the engaging die 30 is an adhesive tape when preparing the first layer of the multilayer lens, and the joining die 30 is shown in FIG. 14 when the second layer of the multilayered lens is prepared. In the case of a rubber ring (ie, an elastic plastic ring), the apron is an annular band having an annular projection on the inner side wall for maintaining a spacing between the first mold half and the second mold half. Moreover, when the apron is used as the engagement mold, the mold further includes a clamp 60 for clamping the first mold half 10 and the second mold half 20 toward each other.

In Example 4, the method of preparing the multilayer lens is as follows:

The first mold half 10 and the second mold half 20 are clamped, and the gap between the first mold half 10 and the edge of the second mold half 20 is sealed by the first joint mold 30, that is, tape, to form a first mold cavity;

Forming a first curable liquid in a first cavity formed by the first mold half 10 and the second mold half 20 to form a first layer of the multilayer lens;

Stripping the entire tape from the mold, separating the second mold half 20 from the first layer of the multilayer lens, keeping the first mold half and the first layer of the multilayer lens unseparated, for example, all or part of the connection;

Then, as shown in FIG. 14, a second cavity is formed between the first mold half 10 and the second mold half 20, the second cavity has a greater thickness than the first cavity, and the second engagement die 30 is used. That is, the apron seals the gap between the first mold half 10 and the edge of the first layer 41 of the multilayer lens, and the annular projection on the rubber ring extends between the second mold half 20 and the first layer 41 of the multilayer lens. For maintaining the distance between the second mold half 20 and the first mold half 10, and then clamping the first mold half 10 and the second mold half 20 by the clamp 60;

Forming a second curable liquid in the second mold cavity to form a second layer of the lens laminated to the first layer of the lens;

Demolding to obtain a multilayer lens.

Other steps not explicitly stated are referred to in Example 2.

20 multilayer lenses were prepared by the method of Example 4, and the yield was 100%.

Example 5

The mold of Embodiment 5 is substantially the same as Embodiment 4, except that the first mold half 10 of Embodiment 5 is as shown in FIG. 15, wherein the first groove 112 is a V-shaped groove located at the edge of the first mold half 10. . V-groove has a depth of 2mm and a maximum width of 1.3mm

In Example 5, the method of preparing the multilayer lens was the same as in Example 4.

20 multilayer lenses were prepared by the method of Example 5, and the yield was 80%.

Example 6

A cross-sectional view of the mold of Example 6 is basically as shown in FIG. The first mold half 10 of the mold of Embodiment 6 is provided with a first cavity surface 110, and the first cavity surface 110 is provided with an annular first protrusion (111). The annular first projection (111) has a circumference of 267 mm, a height of 0.8 mm, and a width of 2 mm. In particular, the annular first projection of Embodiment 6 is not a continuous annular shape but has a discontinuity distributed along the annular path with a discontinuous length of 2 mm.

Other mold assemblies of Example 6 were substantially referred to in Example 1.

The mold preparation method of Example 6 is referred to Example 1.

20 multilayer lenses were prepared by the method of Example 6, and the yield was 60%.

Comparative example 1

The mold of Comparative Example 1 is shown in Fig. 8, and Comparative Example 1 replaces the first mold half 10 of Embodiment 1 with the third mold half 50. The third mold half 50 has a third cavity face 510, and the surface of the third cavity face 510 is continuously flat without protrusions or grooves. The other mold components of Comparative Example 1 were the same as in Example 1.

The engagement die 30 engages the third mold half 50 and the edge 22 of the first replaceable second mold half 21 or the second replaceable mold half. The first replaceable second mold half 21 and the second replaceable second mold half 22 have second cavity faces (211, 220) of different shapes. The first replaceable second mold half 21 can be clamped with the third mold half 50 to define a first mold cavity therebetween; the second replaceable second mold half 22 can be clamped with the third mold half 50 to A second mold cavity is defined therebetween.

A multilayer lens was prepared by following the method steps of Example 1.

Riddle:

1, Comparative Example 1

The mold of Comparative Example 1 had the following problems in the preparation of the lens:

(1) When the first replaceable second mold half 21 and the first layer of the multilayer lens are separated, the resulting pulling force causes the first layer of the semi-solid multilayer lens to be disconnected from the third mold half 50, thereby causing subsequent Operation is not easy. Therefore, in order to avoid the above situation, great patience and meticulous operation are required for separation, which wastes time and effort. It was found that in 20 repeated experiments, the success rate of the first layer of the second half-molded and semi-solid multilayer lenses of Comparative Example 1 was relatively low, about 5%.

(2) The first curable liquid has a volume shrinkage after curing, for example, an average shrinkage of about 3%. The above shrinkage causes a gap between the first layer of the semi-solid multilayer lens and the edge of the third cavity surface 510. Subsequently, when a second curable liquid is applied to the surface of the first layer of the semi-solid multilayer lens, the second curable liquid penetrates between the first layer and the third mold half of the molded product through the slit, for example Penetration into the front surface of the first layer of the molded product causes the first layer of the molded product to be destroyed toward the surface of the third mold half.

It was found in the experiment that in the 20 repeated experiments, the second curable liquid penetrated into the front surface of the first layer of the molded product each time, resulting in a zero yield of the product.

2. About Embodiment 1

The mold of Example 1 has the following beneficial effects in the preparation of the lens:

Embodiment 1 provides a sealed connection between the first mold half 10 and the first layer of the multilayer lens by providing a first recess 112 in the first cavity face 110 of the first mold half 10. The second curable liquid is rendered impermeable to the front surface of the first layer of the multilayer lens.

The volumetric shrinkage of the first layer of the multilayer lens after molding creates a compression bond between the first mold half 10 and the multilayer lens. This compression connection enhances the tightness of the sealed connection.

The arrangement of the third recess 113 causes a snap-fit connection between the first mold half 10 and the first layer of the multilayer lens, the snap-on connection avoiding the first replaceable second mold half 21 and the first molded product on the one hand The first layer of the multilayer lens remains connected to the first mold half during layer separation, and on the other hand the snap connection also enhances the sealing of the sealed joint.

It was found:

(1) In 20 repeated experiments, the success rate of the first layer capable of separating the second mold half and the semi-solid multilayer lens of Example 1 alone was 100%.

(2) In 20 repeated experiments, the second curable liquid did not penetrate into the front surface of the first layer of the molded product, and the yield of the product was 100%.

The above comparison shows that the mold and the preparation method of Embodiment 1 have one or more of the following advantages:

1) The mold cost is low and easy to prepare;

2) The mold structure is simple;

3) The mold has less variation than the conventional mold;

4) The mold is durable and not easily damaged;

5) The mold is used to prepare the molded product, and the yield is high;

6) The mold is used for preparing the molded product, and the operation is simple;

7) The mold is used to prepare a molded product, which is easy to industrialize.

3. About Embodiments 2 to 3

The molds of Examples 2 to 3 have the following beneficial effects in the preparation of the lens:

i) The first mold half 10 is sealed to the first layer of the multilayer lens by providing a first recess 112 in the first cavity face 110 of the first mold half 10. The second curable liquid is rendered impermeable to the front surface of the first layer of the multilayer lens.

Ii) The volumetric shrinkage of the first layer of the multilayer lens after molding causes a compression bond between the first mold half 10 and the multilayer lens. This compression connection enhances the tightness of the sealed connection.

Iii) The separation mold is peeled off by a new process before the second mold half is separated from the first layer of the multilayer lens. Based on the process, the first layer 41 of the second half mold 20 multilayer lens can be conveniently separated, and the first mold half 10 can be kept sealed with the first layer 41 of the multilayer lens to avoid separation of the second mold half. In the first layer of the multilayer lens, the resulting tensile force causes the first layer 41 of the multilayer lens to be disconnected from the first mold half 10. On the other hand, the first portion 301 of the joining die can also enhance the sealing action of the first annular sealing structure, preventing the second curable liquid from penetrating between the first layer 40 of the molded product and the first mold half 10.

4. About Embodiments 4 to 5

The molds of Examples 4 to 5 have the following beneficial effects in the preparation of the lens:

i) The first mold half 10 is sealed to the first layer of the multilayer lens by providing a first recess 112 in the first cavity face 110 of the first mold half 10. The second curable liquid is rendered impermeable to the front surface of the first layer of the multilayer lens.

Ii) The volumetric shrinkage of the first layer of the multilayer lens after molding causes a compression bond between the first mold half 10 and the multilayer lens. This compression connection enhances the tightness of the sealed connection.

Iii) When the second layer of the multilayer lens is prepared, the first mold half 10 and the second mold half 20 are clamped toward each other using a jig 60. Based on this, the clamping force applied by the clamp 60 can also clamp the first layer 41 of the multilayer lens to the first mold half 10, thereby enhancing the sealing effect of the first annular sealing structure and preventing the second curable liquid from penetrating. To between the first layer 40 of the molded product and the first mold half 10.

5. About Embodiment 6

As shown in Embodiment 6, when there is a 2 mm discontinuity on the first projection of the ring, the sealing effect of the annular sealing structure is slightly inferior, and the yield is lowered, failing to reach 100%. However, it is undeniable that Example 6 still achieved a certain sealing effect compared to the case where the yield ratio of Comparative Example 1 was 0%. Therefore, even if there is a 2 mm discontinuity on the annular projection or the annular groove provided on the mold, it is still an annular sealing structure capable of sealing and improving the yield of the product.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that The invention is not limited to the spirit of the technical solutions of the present invention, and should be included in the scope of the technical solutions claimed in the present invention.

Claims (29)

A mold comprising a first mold half (10) having a first cavity face (110), the first cavity face (110) being provided with a first annular seal structure , The first annular seal structure includes a first protrusion (111) and/or a first groove (112) for sealing a region between the molded product and the first cavity face (110). The mold of claim 1 wherein said first annular sealing structure encloses an area of more than 50% of the first cavity face. The mold of claim 1 characterized by one or more of the following: The first annular sealing structure includes an annular first protrusion; The first annular sealing structure includes an annular first groove; Preferably, the first protrusion of the ring is provided with one or more discontinuities, the total length of the discontinuity is ≤ 0.05 L1, and L1 is the circumference of the first protrusion of the ring; Preferably, the first groove of the ring is provided with one or more discontinuities, the total length of the discontinuities is ≤ 0.05 L1, and L2 is the circumference of the first groove of the ring. The mold of claim 1 characterized by one or more of the following: There is a gap between an outer edge of the first annular sealing structure and an edge of the first cavity surface (110); The outer edge of the first annular sealing structure abuts the edge of the first cavity face (110). The mold of claim 1 having one or more of the following features: The direction of the protrusion of the first protrusion (111) is parallel to a normal line passing through a midpoint of the first cavity surface (110); The first groove (112) is recessed in a direction parallel to a normal passing through a midpoint of the first cavity face (110). The mold of claim 1 having one or more of the following features: The direction of the protrusion of the first protrusion (111) is not parallel to the normal line passing through the midpoint of the first cavity surface (110); The direction in which the first groove (112) is recessed is not parallel to the normal passing through the midpoint of the first cavity face (110). The mold of claim 1 having one or more of the following features: An angle between an outer side of at least a portion of the side wall of the first protrusion (111) and an outer side of the first cavity surface (110) is an acute angle; An angle between an inner side of at least a portion of the sidewall of the first recess (112) and an inner side of the first cavity surface (110) is an acute angle. The mold of claim 1 having one or more of the following features: a distance from a top of the first protrusion (111) to a normal passing through a midpoint of the first cavity surface is greater than a bottom of the first protrusion (111) to a normal passing through a midpoint of the first cavity surface distance; The distance from the notch of the first groove (112) to the normal passing through the midpoint of the first cavity surface is greater than the groove bottom of the first groove (112) to pass through the midpoint of the first cavity face The distance of the line. The mold of claim 1 having one or more of the following features: a bus bar of a sidewall of the first protrusion (111) is a curved line or a broken line; a bus bar of a sidewall of the first groove (112) is a curved line or a broken line; The mold of claim 1 having one or more of the following features: a third protrusion and/or a third groove (113) is disposed on a sidewall of the first protrusion (111); A third protrusion and/or a third groove (113) are disposed on a sidewall of the first groove (112). The mold according to claim 10, wherein the third projection or third recess (113) is circumferentially disposed on a sidewall of the first projection (111) or the first recess (112). The mold according to claim 1, wherein the first groove (112) has a stepped or V-shaped cross section. The mold according to claim 1, wherein said first annular seal structure is an annular snap seal structure for sealing a region between the molded product and the first cavity face (110) and detaching the molded product The ground card is attached to the first cavity surface. The mold of claim 1 having one or more of the following features: The first protrusion (111) is used to mold a second groove on the molded product; The first recess (112) is for molding a second projection on the molded product. The mold of claim 1 further comprising a second mold half (20), the second mold half (20) being moldable with the first mold half (10) to define a first mold cavity therebetween; Preferably, the intersection of the end face of the second mold half (20) and the second cavity face (210) is chamfered (201). The mold according to claim 15, wherein said second mold half (20) is moldable with said first mold half (10) to define a second mold cavity therebetween, and said second mold cavity is more than said first mold cavity The cavity has a greater thickness. The mold of claim 1 , the mold comprising a first replaceable second mold half (21) and a second replaceable second mold half (22), The first replaceable second mold half (21) and the second replaceable second mold half (22) have second cavity faces (211, 220) of different shapes; The first replaceable second mold half (21) is moldable with the first mold half (10) to define a first mold cavity therebetween; The second replaceable second mold half (22) is capable of clamping the first mold half (10) to define a second mold cavity therebetween. A mold according to any one of claims 15 to 17, further comprising The engagement die (30) engages the first mold half (10) and the second mold half. The mold according to claim 1, wherein the mold is a casting mold; Preferably, the mold is a multilayer body casting mold; Preferably, the mold is an ophthalmic lens casting mold. The mold according to any one of claims 15 to 17, further comprising a joining die (30) for engaging the first mold half and the second mold half; Preferably, the engagement mold is an endless belt; Preferably, the inner side wall of the engaging die (30) has a viscous layer; Preferably, the inner side wall of the engaging die (30) is provided with an annular protrusion along the length direction of the engaging die, and the annular protrusion is used for maintaining the spacing between the first mold half and the second mold half; Preferably, the engaging die (30) comprises a first part (301) of the joining die and a second part (302) of the joining die, the first part (301) of the joining die is used for engaging the first mold half (10) and molding The second portion (302) of the adapter is used to engage the second mold half (20) with the molded product. A mold according to any one of claims 15 to 17, further comprising a clamp (60) for clamping the first mold half and the second mold half after the mold clamping. A method of preparing a molded product using the mold of any one of claims 1 to 21, the mold further comprising a second mold half, the second mold half (20) and the first mold half (10) Clamping to define a first cavity therebetween, the second mold half being movable relative to the first mold half and again being clamped with the first mold half (10) to define a a two-cavity cavity; the method comprises the following steps: Forming a first curable liquid in a first cavity formed by the first mold half (10) and the second mold half (20) to form a first layer of the multilayer molded product; Separating the second mold half (20) from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product (eg, all or part remains connected); Forming a second cavity between the first mold half (10) and the second mold half (20), the second cavity having a greater thickness than the first cavity; Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product; Demolding to obtain a multilayer molded product. A method of preparing a molded product using the mold of any one of claims 1 to 21, the mold further comprising a first replaceable second mold half (21) and a second replaceable second mold half (22) The first replaceable second mold half (21) is clamped with the first mold half (10) to define a first mold cavity therebetween, and the second replaceable second mold half (22) Forming a mold with the first mold half (10) to define a second mold cavity therebetween; the method comprising the steps of: Forming a first curable liquid in a first mold cavity formed by the first mold half (10) and the first replaceable second mold half (20) to form a first layer of the multilayer molded product; Separating the first replaceable second mold half from the first layer of the multilayer molded product, leaving the first mold half unseparated from the first layer of the multilayer molded product (eg, all or partially remaining connected); Forming a second mold cavity between the first mold half (10) and the second replaceable second mold half (21), the second mold cavity having a greater thickness than the first mold cavity; Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product; Demolding to obtain a multilayer molded product. The method according to claim 22 or 23, the mold further comprising an engagement die (30), the engagement die (30) engaging the first mold half (10) and the second mold half (20); The method includes the following steps: Forming the first mold half (10) with the second mold half (20), and forming a gap between the first mold half (10) and the edge of the second mold half (20) by the joint mold (30) to form the first mold cavity ; Forming a first curable liquid in a first cavity formed by the first mold half (10) and the second mold half (20) to form a first layer of the multilayer molded product; The connecting die (30) is divided into a first part (301) of the connecting die and a second part (302) of the connecting die, and the first part (301) of the connecting die means that the connecting die (30) is connected to the first partial die (10) and a portion of the first layer of the multilayer molded product, the second portion (302) of the joining die means a portion of the joining die (30) that engages the second mold half (20) and the second layer of the multilayer molded product, Separating the second portion (302) of the joining die from the mold while maintaining the connection of the first portion (301) of the joining die to the first layer and the first mold half of the multilayer molded product; Separating the second mold half (20) from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product (eg, all or part remains connected); Forming a second cavity between the first mold half (10) and the second mold half (20), the second cavity having a greater thickness than the first cavity; Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product; Demolding to obtain a multilayer molded product. The method according to claim 22 or 23, wherein the mold further comprises an engagement mold (30), the engagement mold (30) engaging the first mold half (10) and the second mold half (20), the engagement mold (30) comprising a first part (301) of the connecting die and a second part (302) of the connecting die, the first part (301) of the connecting die for engaging the first mold half (20) with the molded product, the connecting die The second part (302) is used to connect the second mold half (10) with the molded product; The method includes the following steps: The first mold half (10) is clamped with the second mold half (20), and the gap between the first mold half (10) and the edge of the second mold half (20) is sealed by the joint mold (30) to form the first mold. Cavity Forming a first curable liquid in a first cavity formed by the first mold half (10) and the second mold half (20) to form a first layer of the multilayer molded product; Separating the second portion (302) of the joining die from the mold while maintaining the connection of the first portion (301) of the joining die to the first layer and the first mold half of the multilayer molded product; Separating the second mold half (20) from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product (eg, all or part remains connected); Forming a second cavity between the first mold half (10) and the second mold half (20), the second cavity having a greater thickness than the first cavity; Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product; Demolding to obtain a multilayer molded product. The method according to claim 22 or 23, wherein the mold further comprises an engagement die (30), the engagement die (30) engaging the first mold half (10) and the second mold half, the engagement mold (30) The inner side wall is provided with an annular protrusion along the length direction of the engaging die, and the annular protrusion is used for maintaining the spacing between the first mold half (10) and the second mold half (20); The mold further includes a clamp (60) for clamping the first mold half and the second mold half after the mold clamping; The method includes the following steps: The first mold half (10) is clamped with the second mold half (20), and the gap between the first mold half (10) and the edge of the second mold half (20) is sealed by the joint mold (30) to form the first mold. Cavity Forming a first curable liquid in a first cavity formed by the first mold half (10) and the second mold half (20) to form a first layer of the multilayer molded product; Separating the second mold half (20) from the first layer of the multilayer molded product, keeping the first mold half unseparated from the first layer of the multilayer molded product (eg, all or part remains connected); Forming a second cavity between the first mold half (10) and the second mold half (20), the second cavity having a greater thickness than the first cavity, and engaging the first mold half with the engagement die (30) (10) and the second mold half (20), the projection of the engagement mold is located between the second mold half (20) and the first layer of the multilayer molded product, maintaining the second mold half (20) and the first The spacing between the mold halves (20), the first mold half (10) and the second mold half (20) are clamped toward each other by a clamp (60); Forming a second curable liquid in the second mold cavity to form a second layer of a molded product laminated with the first layer of the molded product; Demolding to obtain a multilayer molded product. A method according to claim 22 or 23, wherein the forming of the second layer of the molded product and the demolding further comprises the step of compounding one or more layers on the second layer of the molded product. A molded product obtained by molding the mold according to any one of claims 1 to 21; Preferably, the molded product is a layered body; Preferably, the molded product is a multilayer body; Preferably, the molded product is transparent; Preferably, the material of the molded product is plastic, glass or metal; Preferably, the molded product is a transparent optical body; Preferably, the molded product is a lens; Preferably, the molded product is an ophthalmic lens; Preferably, the molded product is a multilayer lens; Preferably, the molded product contains a dye; Preferably, at least one layer of the multilayer body contains a dye; Preferably, the dye is a photochromic dye; Preferably, the ophthalmic lens is a contact lens or a non-contact lens; Preferably, the molded product is a multilayer ophthalmic lens, the first layer of the multi-layer ophthalmic lens is a flat lens layer, the second layer is a refractive lens layer, the flat lens layer contains a dye, and the refractive lens layer contains no dye. A molded product obtained by the process of any one of claims 22 to 27.

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