JP2000061969A - Laminate molding method using plastic fluid and its mold structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When mounting an adhered surface having a curved surface in a mold and injecting and compressing molten resin, it is easy to hold the adhered surface in the mold in close contact. The present invention provides a lamination molding method and a mold structure that can perform lamination molding safely and reliably. SOLUTION: An entire surface opposite to a surface which receives a flow pressure of a molding material at the time of molding a fragile adhered surface body (such as a bent sheet glass 30) in a mold cavity 2 is formed into a plastic fluid 20. The molten resin 10 is injected and compression-molded. Further, in order to realize such lamination molding, the mold block 1 having the cavity 2 is provided with an overflow passage so that the back side of the adhered surface body is uniformly held by the plastic fluid during compression molding. 5 and a weir 6 for blocking the same are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a heterogeneous member is mounted inside a cavity of a mold and a resin is injected and compression-molded to be integrated, that is, a so-called laminating molding is performed. The present invention relates to a laminate molding method using a plastic fluid having a function of increasing the degree of adhesion with a resin and performing safe and reliable molding, and a mold structure thereof.

[0002]

2. Description of the Related Art Conventionally, for example, to obtain a reinforced transparent plate, a transparent thermoplastic resin melted on one surface of a laminated glass or a flat glass plate is integrally laminated by injection compression molding to laminate a different material. It is known to manufacture (bonded plates). In order to obtain these transparent plate materials having a relatively large area, the adherend (glass plate, etc.) can be used as it is as long as it has excellent dimensional accuracy in order to produce it by the latter molding method. There is no problem in molding even if it is mounted in the cavity and subjected to injection compression molding or injection press molding. Therefore, when it is manufactured as a laminated body by molding, generally, an adherend (such as a glass plate) is mounted in a cavity of a mold, and then a required amount of molten resin is injected to perform compression molding or injection press molding. By doing so, a desired product can be obtained.

[0003]

However, when a laminated body having a two-dimensional curved surface or a three-dimensional curved surface is manufactured by injection compression molding in obtaining a laminated body, a curved surface which is an adherend, unlike a flat plate, is used. In the case of a hard sheet (for example, curved glass) with dimensional accuracy in the process is unstable,
It is difficult to hold the mold closely. In particular, when the adherend having a hard surface is a curved plate glass, cracks may occur or break during molding in a portion that cannot be adhered to the mold, resulting in difficulty in molding.

Particularly, when the adherend is a three-dimensionally bent hard sheet, the portion which is rigid and does not adhere to the die is more likely to be damaged. .

However, there is a demand from consumers for a strengthened demand for a transparent hard plate having a two-dimensional or three-dimensional curved surface.

The present invention has been made in view of the above circumstances, and when a surface-to-be-adhered body having a curved surface is mounted in a mold and molten resin is injected and compression-molded, the structure is formed in the mold. An object of the present invention is to provide a laminate molding method using a plastic fluid and a mold structure for the same, by which the adherend of the adherend surface can be easily held and the laminate molding can be carried out safely and reliably.

[0007]

In order to achieve the above-mentioned object, a method of laminating and molding using a plastic fluid according to the first aspect of the present invention is a method in which a surface to be adhered, which is easily broken, is In the cavity, the entire surface on the side opposite to the surface that receives the flow pressure of the molding material at the time of molding is supported by a plastic fluid body for molding.

According to the molding method of the first invention, the space formed between the die and the rear surface of the adherend when the adherend is placed in the mold cavity. The back surface of the adherend is evenly supported by the plastic fluid so that the part is filled with the plastic fluid, and then the mold is closed and the molding material (for example, molten resin) is injected into the cavity. When injected and compression-molded, the back surface side is evenly received by the plastic fluid even if the adherend surface body is pressed by the entire surface by the pressure applied to the molten resin. It is held in close contact with the mold through the plastic fluid. Therefore, even if the adherend has a strain, the plastic fluid fills the cavity space according to the strain and holds the entire back face evenly. Thus, a laminated body having a curved surface can be obtained by the above-mentioned laminated molding. With respect to the plastic fluid arranged on the back side of the adherend, it is possible to prevent the excess from overflowing from the inside of the mold.

Further, according to the present invention, in order to dispose the plastic fluid in the cavity between the rear surface of the adherend and the mold surface, a plate-shaped product is mounted on the mold. It is advisable that the adherend surface member is applied to the front surface side of the container and held. Alternatively, it is preferable that the plate-like plastic fluid is pasted on the non-adhesive surface side of the adherend surface body and then inserted into the mold. In this case, it is easy to make the amount of the plastic fluid used to correspond to the holding surface of the adherend surface body in advance, so that the work can be efficiently performed without waste.

Further, as a means for supplying the plastic fluid in the cavity between the back of the adherend and the cavity surface of the die, an injection passage for the plastic fluid is provided in the die in advance, and the injection passage is provided in the injection passage. On the other hand, it is preferable that the mold can be inserted and filled from outside the mold by a pump or the like. This makes it possible to automate operations other than the loading operation of the adherend surface body into the cavity in the molding operation, and it is possible to expect an improvement in workability.

Further, in the present invention, a molding material is injected into the plastic fluid to be received in the mold cavity,
The plastic flow is stopped when a pressure sufficient to bring the adherend surface body and the molding material into close contact is received, and the plastic fluid body is adapted so that the adherend surface body can respond to the joining pressure of the molding material on the back side. It is better to hold the. By doing so, the pressures acting on the adherend surface body and the molding material are balanced, and the adherend surface body with variations can be reasonably held in the mold and laminated molding can be performed without damage. Become. In order to do so, it is preferable to use a part of the edge of the adherend to close the overflow port of the plastic fluid provided in the mold.

In the present invention, it is preferable that the plastic fluid for holding the adherend on the back surface is a plastic body containing no water. The plastic fluid is preferably an oil clay plastic fluid. Moreover, you may make it use the organic viscous material used for a tooth-entry stabilizer. By using such a plastic fluid, it is easy to maintain the pressure balance, and since the volume does not change due to hardening or evaporation during molding, the intended purpose can be easily achieved.

Next, a mold structure according to a second aspect of the present invention is for carrying out the laminate molding method utilizing the plastic fluid according to the first aspect of the present invention, and has a surface to be adhered in the cavity of the mold. A plastic fluid receiving space is formed on the rear end surface of the portion where the body is loaded, slightly deeper than the receiving position of the adherend, and a weir is provided at a part of the peripheral edge of this plastic fluid receiving space. An overflow passage of a plastic fluid is provided outside the mold so as to communicate with the outer surface of the mold.

The mold structure of the present invention having the above-described structure has a predetermined size of the adhered surface when the adhered surface-like body is loaded and held in the cavity during the laminated molding. A space is formed on the back side from the holding position of the shaped body, and the plastic fluid is fed into the space by the required means,
By the time the mold is closed and the molding material is injected, the back surface side of the adherend is received by the plastic fluid, and in this state, the molding material is injected and filled into the front surface of the adherend surface body. Then, when the injection-filled molding material fills and adheres to the front surface of the adherend surface material, the plastic fluid located behind due to the fluid pressure causes the surface state of the adherend surface material object in the space portion. In accordance with the above, a plastic flow occurs, and a pressure-balanced state is formed on the adherend surface body on both front and rear surfaces. At this time, the plastic fluid is discharged to the outside through the overflow passage when the capacity exceeds the pressure balancing capacity in the filled space, and at the same time, the edge of the adherend at the position where the pressure balance can be maintained, It is possible to mold without damaging the pressure balance in the subsequent pressure bonding step by closing the preset weir and closing the overflow passage.

Further, in the present invention, a plastic fluid passage communicating with the outside is provided on the rear end face side of the portion for feeding the adherend surface-like body in the cavity, and an outer end portion of the plastic fluid passage. It is preferable that a pump for injecting the plastic fluid be attached and a check valve be provided in the middle of the plastic fluid passage. In this way, when the adherend is placed in the cavity and temporarily held, the plastic fluid is then injected from outside by a pump behind the adherend and the molding material is injected and compressed. By performing the operation to be performed with an appropriate time lag, it is possible to automate the operation. A plunger pump is preferably used as the pump for injecting the plastic fluid. By using this type of pump, it is possible to regulate the injection amount of the plastic fluid, and there is an advantage that no unreasonableness occurs.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, with respect to a laminated molding method using a plastic fluid according to the first invention, a concrete embodiment carried out by using a mold structure according to the second invention will be described with reference to the drawings. explain.

FIG. 1 is a schematic cross-sectional view of an embodiment of a mold structure suitable for carrying out the laminating method using a plastic fluid according to the first invention. The mold shown in this embodiment is for compression molding, and the cavity 2 is formed in one mold block 1 and the cavity is formed by a molding convex portion 4 formed in the other mold block 3. In the structure, a resin layer is molded into a desired shape on one surface of the adherend, and a laminated plate-shaped molded product having a curved surface is obtained. Of course, injection molding may be performed by installing a molding material injection device and a material passage (not shown).

In injection compression molding, the cavity 2 is provided with a curved surface 2a which substantially matches the curved surface formed on the front surface 4'of the molding convex portion 4 formed on the other mold block 3.
An overflow passage 5 of a plastic fluid used at a position apart from a pouring position (gate position) of a molding material (molten resin) not shown is provided so as to communicate with the outside at least at one position. In the vicinity of the inside of the cavity 2 of the overflow passage 5, a weir 6 is formed which is in contact with the edge of the adherend surface body during molding and blocks the overflowing plastic fluid.

Both of the mold blocks 1 and 3 have a well-known structure except for the above-mentioned structure, and the means for temporarily holding the adherends to be laminated and formed are closed. It is supported by well-known means so that it does not fall or slip until it is injection-compressed.

2 (a), 2 (b), with respect to the procedure for performing the molding operation by the injection compression molding machine using the mold structure for molding the curved surface laminate according to the present embodiment having the above-described structure.
This will be described with reference to the explanatory diagram of the procedure for forming the laminate shown in (c). First, a die is mounted on an injection compression molding machine (not shown), and the previously prepared adherend surface body to be laminated is loaded into the cavity 2 of the one die block 1. As the adherend to be used here, a bent plate glass 30 processed into a two-dimensional curved surface is used.
As the plastic fluid 20 that holds the bent plate glass 30 on the back side, for example, an oil clay type plasticine or a commercially available dental stabilizer (for example, a viscous material containing PVA as a main component) is used.

First, as shown in FIG. 2A, a sheet-shaped plastic fluid 20 having an appropriate thickness corresponding to the surface area of the bent plate glass 30 to be charged is put in the cavity 2 and, for example, The cavity 2 is attached along the curved surface 2a. It should be noted that the sheet of the plastic fluid 20 has a thickness measured by previously measuring the bending strain of the bent plate glass 30 used for laminating, and predicting the relationship with the correction amount that can deal with the degree of the strain. It is desirable to set it.

Next, the bent plate glass 30 is loaded into the cavity 2 so that the convex curved surface side is along the sheet surface of the plastic fluid 20. At this time, it is preferable that the sheet surface of the plastic fluid 20 is contacted and temporarily held.

Prepared in this way, one mold block 1
After inserting the bent plate glass 30 into the cavity 2 of
As shown in FIG. 2 (b), when the molding convex portion 4 of the other mold block 3 is received in the cavity 2 of one mold block 1 and injection compression molding is performed by a well-known means, an injection not shown When a required amount of molten resin 10 (hereinafter referred to as molten resin 10) is injected and injected from the nozzle and the resin passage into the cavity 2, the molten resin 10 diffuses and flows along the front surface of the bent plate glass 30 in the cavity 2. Then, along with the flow of the injected molten resin 10, the bending pressure of the molten resin 10 gradually acts on the charged bent plate glass 30, and the plastic fluid 2 located behind
The pressing force acts on the sheet of 0.

Since the sheet of the plastic fluid 20 is located between the inner surface 2a of the cavity 2 and the bending plate glass 30 that is inserted and fills the space, it is plastically fluidized by the fluid pressure, The space between the bent plate glass 30 and the inner surface 2a of the cavity 2 is filled with the pressing force applied through the bent plate glass 30. Bending plate glass 3 in the meantime
0 is pressed against the inner surface 2a side of the cavity 2 by the fluidization of the plastic fluid 20, and the excess plastic fluid 20 flows into the overflow passage 5 according to the displacement amount and is pushed out of the mold block 1. Be done. Eventually, when the displacement of the bent sheet glass 30 approaches the limit, the edge of the bent sheet glass 30 comes into contact with the weir 6 provided in the vicinity of the overflow passage 5 to confine the plastic fluid 20 behind the bent sheet glass 30. become. In short, at the time of injection compression molding of resin, the plastic fluid 20 that is confined behind the bent plate glass 30 becomes solid along the surface shape of the bent plate glass 30, and is held in a completely comfortable posture. Become. As a result, the bent plate glass 30 is in a state where the pressures generated in the plastic fluid 20 remaining on the front and rear surfaces and the injected molten resin 10 for molding are balanced.

Therefore, by the pressing action of both mold blocks 1 and 3 continuously applied thereafter, the cavity 2 is
The resin layer (10 ') of the required thickness made of the molten resin 10 is compression-molded on one surface of the bent plate glass 30 which is entirely held by the plastic fluid 20 remaining inside to obtain a laminate (FIG. 2). (See (c)). Further, in the above-mentioned embodiment, the plastic fluid 20 is preliminarily charged into the cavity 2. However, the plate-shaped plastic fluid 20 is preliminarily adhered to the adherend 30 corresponding to the mold surface by pre-adhesion, and then the metal The same effect can be obtained even if the mold cavity 2 is loaded and held.

The laminated body compression-molded in the cavity 2 in this way is taken out to the outside by opening the mold after the required cooling time has elapsed. Since the plastic fluid 20 used for fixing is adhered in the form of a film on the outer surface of the bent plate glass 30 of the laminated body formed in this state, for example, the adhered film-like plastic fluid is used. Air may be blown from one end between the bent plate glass 20 and the bent plate glass 30 to cause the mold to separate, and the removal treatment may be performed. In this case, since the laminated molded body side is a bent sheet glass, the surface thereof is smooth and easily loosened. Further, since the plastic fluid 20 thus removed is of a clay type as described above, it can be recovered as it is, kneaded again, and reused. Of course, the plastic fluid 20 that overflows during the molding operation is also collected and reused. Therefore, this auxiliary material can be effectively utilized.

Next, FIG. 3 is a schematic sectional view of another embodiment of the mold structure. This mold is also for injection compression molding, although the resin passage is not shown, as in the above embodiment. Therefore, the same components as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The mold structure of this embodiment is almost the same as that of the above embodiment in its overall structure, but is different in that the pump for press-fitting the plastic fluid 20 into the outer side of the mold block 1 having the cavity 2 is used. 7 is installed side by side. In addition, from the discharge port 7a of the pump 7 to the cavity 2
A supply passage 8 is provided at an appropriate position on the inner surface 2a of the so that the plastic fluid can be pumped during the molding. A check valve 9 is provided in the middle of the supply passage 8 to prevent the plastic fluid 20 supplied during pressurization from flowing back to the pump 7 side.

As the pump 7 for press-fitting the plastic fluid, a plunger pump is most preferable because it can quantitatively feed the plastic fluid 20. However, the material is not limited to the plunger pump as long as it can pressurize and feed the material having relatively high viscosity as described above. It is desirable that the plunger pump is provided with a supply port 7b for supplying the plastic fluid 20 by a required amount to prevent an excessive amount from being supplied so that overflow can be restricted.

Next, the laminated body shown in FIGS. 4 (a), 4 (b), and 4 (c) for the procedure of performing the molding operation by the injection compression molding machine using the mold structure constructed as described above. This will be described with reference to the explanatory drawing of the molding operation procedure. First, a mold is attached to an injection compression molding machine (not shown), and a previously prepared adherend surface body (using bent plate glass 30 as in the above example) of the one mold block 1 is attached. Insert into the cavity 2. In this embodiment, unlike the case of the above-mentioned embodiment, since the sheet-shaped plastic fluid is not used, the bent plate glass 30 is inserted along the inner peripheral surface of the cavity 2 (Fig. 4 ( See a)).
Further, the plastic fluid 20 is prepared so that a preset amount can be supplied from the supply port 7b of the pump 7 and pressure-fed.

Next, as shown in FIG. 4 (b), the plastic fluid 20 is fed into the cavity 2 by the pump 7 while the mold blocks 1 and 3 are closed. At the same time, the molten resin 30 to be laminated is injection-injected from an injection nozzle (not shown) and a resin passage into the front surface of the bent plate glass 30 loaded in the cavity 2. The timing of the injection of the plastic fluid 20 and the injection injection of the molten resin 10 should be adjusted so that the plastic fluid 20 side is filled as soon as possible on the back surface side (during molding) of the bent plate glass 30. To

In this way, the molten resin 10 injected and injected into the front surface of the bent plate glass 30 in a state in which the plastic fluid 20 is fed to the rear surface side in the cavity 2 diffuses and flows, and is filled in the cavity 2. It In this process, the pressing force applied by the molten resin 10 injected and injected acts on the entire surface of the bent plate glass 30 as it diffuses from the injection point.

Then, the pressing force acting on the molten resin 10 side presses the plastic fluid 20 on the back side through the bent plate glass 30, and at that time, the plastic fluid 20 side is in a flowable state. The flow surplus is pushed out of the mold block 1 through the overflow passage 5 by the pressing force of the molten resin 10. When the displacement of the bent plate glass 30 approaches its limit, the edge of the bent plate glass 30 contacts the weir 6 provided in the vicinity of the overflow passage 5 to confine the plastic fluid 20 behind the bent plate glass 30. It will be. In short, at the time of injection compression molding of resin, the plastic fluid 20 that is confined behind the bent plate glass 30 becomes solid along the surface shape of the bent plate glass 30, and is held in a completely comfortable posture. Become. As a result, the bent plate glass 30 is in a state where the pressures generated in the plastic fluid 20 remaining on the front and rear surfaces and the injected molten resin 10 for molding are balanced. Of course, in this state, the check valve 9 in the supply passage 8 of the plastic fluid 20 is not closed and the plastic fluid 20 is not pushed back to the pump 7 side.

In this way, both mold blocks 1,
When 3 continues the pressing action, a resin layer (10 ') having a required thickness made of the molten resin 10 is compression-molded on one surface of the bent plate glass 30 whose back surface is fixedly held over the entire surface by the plastic fluid, so that the laminated body is formed. It is obtained (Fig. 4 (c))
reference). After that, after the required cooling time has elapsed, the mold may be opened and taken out to remove the adhering plastic fluid in the same manner as in the above embodiment. Of course, the removed plastic fluid is reused.

The drive source can be omitted if the pump 7 for feeding the plastic fluid into the mold is constructed so as to operate in accordance with the operation of the molding machine. However, when adopting such a drive system, it is preferable to additionally provide a safety device in which the pump does not operate at a certain operation stroke or more so that the mold is closed and excessive pressure is not applied afterward.

Although not shown in the drawings, as to the overflow process of the plastic fluid provided in the cavity 2 of the mold as described above, a reservoir is provided in the mold block in addition to the overflow passage described above. It is also possible to take out the over amount for each shot. Further, the mechanism for blocking the overflow of the plastic fluid described above is preferably provided at the end of the flow of the plastic fluid. Furthermore, in the above description of the embodiment, the plastic fluid is fed from one end of the cavity, but it may be radially moved from the vicinity of the center of the curved body.

In the above-mentioned embodiments, the bent plate glass is used as an example of the adherend surface member, but other than this, for example, even a curved surface member of polycarbonate is effectively laminated. Can be molded. Further, based on the molding method of the present invention, a molding method with the addition of a press,
For example, in addition to the injection press method, if the extrusion press method, stamping method, etc. are used for molding, the entire curved body is pressed against the mold with a uniform pressure, and the pressure applied to the composition fluid can be made uniform, so that it adheres to the mold. And the cracks on the curved body
Can prevent damage.

As described above, according to the molding method of the present invention (first invention), an article such as a window glass formed on a curved surface is provided with a glass plate on its front side and a transparent synthetic resin ( For example, it becomes easy to produce a product reinforced by (polycarbonate), and it is possible to increase the productivity and provide it at a low cost.

The plastic fluid supply passage 8 in the above embodiment corresponds to the injection passage of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of a mold structure suitable for carrying out a laminate molding method using a plastic fluid according to the present invention.

FIG. 2 is an explanatory view of a procedure for forming a laminated body,
(A) shows a state before feeding the adherend, (b) shows a state in which a plastic fluid is charged and molten resin is injected, and (c) shows a state in which compression molding is performed. It is the figure showing.

FIG. 3 is a schematic sectional view of another embodiment of the mold structure.

FIG. 4 is an explanatory view of another molding operation procedure of the laminated body,
(A) shows a state before feeding the adherend, (b) shows a state in which a plastic fluid is charged and molten resin is injected, and (c) shows a state in which compression molding is performed. It is the figure showing.

[Explanation of symbols]

1,3 mold block 2 cavities 2a Cavity curved surface 4 Molded convex part Front of 4'molded protrusion 5 overflow passages 6 weirs 7 pumps 8 Plastic fluid supply passage 9 Check valve 10 Molten resin 20 plastic fluid 30 Bent flat glass

Claims (8)

[Claims] 1. An adhering surface-like body which is easily damaged is formed in a cavity of a mold by supporting a whole surface opposite to a surface which receives a flow pressure of a molding material at the time of molding with a plastic fluid. A laminated molding method using a plastic fluid characterized by the following. 2. In order to arrange the plastic fluid in the cavity between the surface of the adherend and the surface of the mold, a plate-shaped material is charged into the mold and the surface thereof is charged. The laminated molding method using a plastic fluid according to claim 1, wherein the adherend surface body is applied to and held by the side. 3. In order to arrange the plastic fluid in the cavity between the back surface of the adherend and the mold surface, a plastic plate is preliminarily plate-shaped on the non-adhesive surface side of the adherend. The laminate molding method using a plastic fluid according to claim 1, wherein the fluid is attached and then charged into a mold. 4. As a means for supplying the plastic fluid in the cavity between the back surface of the adherend and the cavity surface of the die, an injection path for the plastic fluid is previously provided in the die,
The laminate molding method using a plastic fluid according to claim 1, wherein the injection path is fed and filled from outside the mold by a pump or the like. 5. The plastic fluid that is received in the mold cavity is stopped when the molding material is injected and the pressure is sufficient to bring the adherend surface material and the molding material into close contact with each other. The method of laminate molding using a plastic fluid according to claim 1, wherein the adhered surface-like body holds the plastic fluid on the back side so as to correspond to the joining pressure of the molding material. 6. The laminate molding method using a plastic fluid according to claim 1, wherein the plastic fluid is a water-free plastic body. 7. A plastic fluid receiving space is formed at a rear end surface of a portion of the mold cavity where the adhered surface-like body is loaded, and the plastic fluid receiving space is formed slightly deeper than a receiving position of the adhered surface-like body. A mold using a plastic fluid, characterized in that a weir is provided at a part of the peripheral edge of the space, and an overflow passage of the plastic fluid is provided outside the weir so as to communicate with the outer surface of the die. Structure. 8. A plastic fluid passage communicating with the outside is provided on a rear end face side of a portion for feeding the adherend surface-like body in the cavity, and the plastic fluid passage is provided at an outer end portion of the plastic fluid passage. The mold structure according to claim 7, further comprising a pump for injecting, and a check valve in the middle of the plastic fluid passage.