JP2004291324A - Mold for multicolor molding and multicolor molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mold a molded product constituted so that a second molded body comprising a second resin is provided in a first molded body comprising a first resin and the periphery of the second molded body excepting a design surface is surrounded by the first molded body. <P>SOLUTION: This mold has a cavity mold 31 for molding the design surface of the molded product, a core mold 32 for forming a molding cavity 33 along with the cavity mold 31, a slide piece 37 having a shape corresponding to that of the second molded body and made movable so as to advance and retreat within the cavity 33, a first gate 34 for injecting the first resin 51 in the cavity 33 when the slide piece 37 is located within the cavity 33 and the second gate 40 provided to the core mold 32 to inject the second resin 54 in the core mold 32 from the side opposite to the design surface. Further, this mold is equipped with a core slide 38 for cutting off the second gate 40 when the slide piece 37 is located in the cavity 33 and opening the same after the first molded body is molded to form a resin passage 52 for letting the slide piece 37 communicate with the second gate 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multicolor molding die and a multicolor molding method, and more particularly to a multicolor molding die and a multicolor molding method used for molding a molded product into a structure in which a second molded product is located in a closed space excluding a design surface of a first molded product. TECHNICAL FIELD The present invention relates to a multicolor molding die and a multicolor molding method that can be performed.
[0002]
[Prior art]
In a conventional mold that performs multicolor molding using different resins, a cavity is divided into a first cavity portion and a second cavity portion by projecting a core slide from a core mold side in a mold direction. After the first resin is injected into the one cavity to form the first molded body, the core slide is retracted and the second resin is injected into the second cavity, thereby forming the core slide by retreating. In addition, there is a structure in which a first resin and a second resin are bonded to each other at a communicating portion of the two cavity portions to perform two-color molding to form a molded product (for example, see Patent Documents 1 and 2).
[0003]
[Patent Document 1]
JP-A-11-2077782
[0004]
[Patent Document 2]
JP-A-11-216741
However, in this conventional mold, the second molded product only obtains a molded product in which the second molded product is partially polymerized on the first molded product, and the second molded product excluding the design surface as shown in FIG. A multi-color molded product (two-color molded product) that is entirely surrounded by the first molded body cannot be molded.
[0005]
As shown in FIG. 6, such a multicolor molded article 1 has a structure in which a second molded body 3 made of a second resin is provided inside a first molded body 2 made of a first resin. Has become. In this molded product 1, the surface on which the second molded body 3 is provided is the design surface 4, and the second molded body 3 is visible from the design surface 4. Of the design. In this case, since the periphery of the second molded body 3 excluding the design surface 4 is surrounded by the first molded body 2, only the first molded body 2 is located on the back surface 5 opposite to the design surface 4. It has become. When such a multicolor molded article 1 is injection-molded, a mold 10 shown in FIGS. 7 and 8 or a mold 11 shown in FIGS. 10 and 11 is used.
[0006]
In these molds 10 and 11, a cavity 14 for molding a molded product is formed by clamping the mold 12 in a state where the mold 12 and the core 13 face each other. In this case, the molding surface 12a on the cavity 14 side of the mold cavity 12 is designed to mold the design surface of the molded product. Further, a first gate 16 for injecting the first resin 15 into a cavity 14 formed by mold clamping is provided in the core mold 13.
[0007]
In the mold 10 shown in FIGS. 7 and 8, the molding order is such that the first molded body 2 is molded and then the second molded body 3 is molded. In the mold 10, a slide piece 17 is used. The slide piece 17 is formed in a shape corresponding to the second molded body 3, and is movably inserted into a slide hole 12 b formed in the mold 12. A second gate 18 for injecting the second resin into the cavity 14 is arranged at a portion corresponding to the slide piece 17 in the core mold 13. The slide piece 17 is supported on the second gate 18.
[0008]
As shown in FIG. 7, the lower part of the molding by the mold 10 is positioned in the cavity 14 in a state where the slide piece 17 is supported by the second gate 18 and the second gate 18 is closed. In this state, the first resin 15 is injected into the cavity 14 from the first gate 16 to form the first molded body 2.
[0009]
After that, the second resin 19 is injected into the cavity 14 from the second gate 18. By this injection pressure, the slide piece 17 slides in the direction of the mold 12 and retreats from the cavity 14 as shown by an arrow D in FIG. 8, and the second gate 18 is opened. The injected second resin 19 fills the slide piece 17 in the exit space and cures to form the second molded body 3. Thereby, the multicolor molded article 1 shown in FIG. 9 is formed.
[0010]
In the mold 11 shown in FIGS. 10 and 11, the molding order is such that the first molded body 2 is molded after the second molded body 3 is molded. In the mold 11, a second gate 18 for injecting the second resin 19 is provided on the mold 12 side. The core mold 13 is provided with a core block 20 that can move forward and backward in the cavity 14. The core block 20 is formed by an inner block 21 and an outer block 22 surrounding the inner block 21. The inner block 21 forms a space for forming the second molded body 3 in a state shown in FIG. It has become.
[0011]
In the molding by the mold 11, the second molded body 3 is molded by injecting and curing the second resin 19 from the second gate 18 in the state shown in FIG. After that, the first resin 15 is injected into the cavity 14 from the first gate 16. As a result, the entire core block 20 moves away from the mold 12 and the first resin 15 fills the entire cavity 14. Then, when the first resin 15 is cured, the multicolor molded article 1 in which the periphery of the second molded body 3 excluding the design surface 4 is surrounded by the first molded body 2 can be obtained.
[0012]
[Problems to be solved by the invention]
However, in the mold 11 shown in FIGS. 10 and 11, since the second gate 18 is opened on the molding surface 12 a side of the mold 12, the molded product 1 molded by the mold 11 has the design surface 4. Traces of the second gate 18 remain on the side. Therefore, the mold 11 cannot be used for a molded product having the design surface 4 as a commercial value. Further, since the second molded body 3 is molded first, if the second molded body 3 is thin and has low rigidity, it cannot withstand the injection pressure at the time of injection of the first resin 15, There is also a problem that the second molded body 3 cannot be deformed to have a predetermined shape.
[0013]
On the other hand, in the mold 10 shown in FIGS. 7 and 8, no trace of the gate remains on the design surface 4 of the molded product 1, and the second molded product 3 is removed after the first molded product 2 is molded. Due to the molding, it is possible to prevent the deformation of the second molded body 3.
[0014]
However, in the mold 10, even if the slide piece 17 blocks the second gate 18, the first resin 15 flows backward from the second gate 18 due to the pressure at the time of injection of the first resin 15. However, in order to prevent the backflow, it is necessary to use a valve gate as the second gate 18, which has a problem that the control becomes complicated. Further, since the second gate 18 is fixedly located in the cavity 14, the space 6 corresponding to the shape of the gate 18 remains in the molded article 1 as shown in FIG. Since the space portion 6 is not filled with the first resin 15, the strength is reduced. Therefore, for example, when an elastomer resin is used as the second resin 19, there is a problem that the entire molded article 1 is carelessly bent by an external force.
[0015]
The present invention has been made in view of the above problems, and when forming in the order of forming the second molded body after the first molded body, it is easy to control and has sufficient strength. It is an object of the present invention to provide a multicolor molding die and a multicolor molding method capable of forming a multicolor molded article having a design that does not impair the design property.
[0016]
[Means for Solving the Problems]
To achieve the above object, the multicolor molding die according to the first aspect of the present invention includes a first molded body made of a first resin, a second molded body made of a second resin provided in a first molded body made of a first resin. A mold for molding a molded article surrounded by the first molded body except a surface of the second molded article, and a mold for molding a design surface of the molded article; A core mold that forms a cavity for molding between them, a slide piece having a shape corresponding to the second molded body and capable of moving in and out of the cavity, and a slide piece positioned in the cavity. A first gate for injecting the first resin into the cavity when the first mold is formed, and a second resin provided on the core mold from a peripheral surface excluding the design surface, for example, from the opposite side of the design surface. It can move forward and backward with the second gate to be ejected. A core slide that is located in the cavity or circumscribes the cavity and forms a part or all of a resin passage that communicates the slide piece and the second gate at a retracted position. I do.
[0017]
According to the first aspect of the present invention, the first molded body is molded by injecting the first resin from the first gate while the slide piece is located in the cavity. At this time, since the core slide shuts off the second gate, the core slide is in the forward position and is located in the cavity or is in circumscribing with the cavity, so that the first resin does not go around the second gate. Does not flow back to the gate. Therefore, it is not necessary to use a valve gate having a complicated structure as the second gate, and the control becomes easy.
[0018]
After the molding of the first molded body, a part or all of the resin passage connecting the slide piece and the second gate is formed by retreating the core slide. In response to this state, the second gate injects the second resin from a peripheral surface excluding the design surface of the molded product, for example, from the opposite side of the design surface as the slide piece exits from the inside of the cavity. The second resin is filled into the slide piece retreat space from the resin passage, so that a molded article in which the periphery of the second molded body except for the design surface is surrounded by the first molded body can be molded. . When the second molded body is molded, the second resin is also filled into the resin passage, so that no space remains on the back surface opposite to the design surface, and the molded product has strength. It can be.
[0019]
Therefore, with such a mold, it is possible to form a multicolor molded product that is easy to control, has sufficient strength, and does not impair the design.
[0020]
In the multicolor molding die according to the second aspect of the present invention, a second molded body made of a second resin is provided in a first molded body made of a first resin, and a second molding excluding a design surface is provided. A mold for molding a molded article whose body is surrounded by a first molded article, and a cavity for molding between the mold and a mold for molding a design surface of the molded article; And a slide piece having a shape corresponding to the second molded body and capable of moving forward and backward in the cavity, and a slide piece in the cavity when the slide piece is located in the cavity. A first gate for injecting the first resin, a second gate provided on the core mold for injecting the second resin from a peripheral surface excluding the design surface, and capable of moving forward and backward. Located in the cavity in the forward position or circumscribed in the cavity A core slide which forms a part of a resin passage communicating the slide piece and the second gate at a retracted position, and which can be advanced and retracted into the cavity; And a core pin that retreats from the resin passage to form the remaining portion of the resin passage.
[0021]
Also in the second aspect of the present invention, as in the first aspect of the present invention, the core slide advances and is located in or circumscribes the cavity when the first molded body is formed. Does not flow back to the second gate.
[0022]
In addition, according to the second aspect of the present invention, when the second resin is injected, the core pin withdraws from the inside of the cavity and forms the remaining portion of the resin passage. This allows the cavity to be filled with the second resin. This makes it possible to form a molded article having strength without leaving a space on the back surface opposite to the design surface.
[0023]
Therefore, also in the mold according to the second aspect of the present invention, it is possible to form a multicolor molded product which is easy to control, has sufficient strength, and does not impair the design.
[0024]
According to a third aspect of the present invention, there is provided the multicolor molding die according to the first or second aspect, wherein a plurality of the slide pieces are arranged.
[0025]
By arranging a plurality of slide pieces in this way, it is possible to cope with multicolor molding of three or more colors, and versatility is improved.
[0026]
According to a fourth aspect of the present invention, there is provided the multicolor molding die according to the first or second aspect, wherein the second gate is provided corresponding to one or more slide pieces. .
[0027]
By providing the second gates corresponding to the slide pieces in this way, it is possible to cope with multicolor molding of three or more colors.
[0028]
The invention of claim 5 is the multicolor molding die according to any one of claims 1 to 4, characterized in that the resin passage has a gas injection port.
[0029]
As described above, by having the gas injection port in the resin passage for the second molded body, gas is injected at the time of or after the resin is injected, thereby preventing sink marks which are likely to occur in a portion where the secondary molded body becomes thick. Thus, the appearance of the molded body can be improved.
[0030]
In the multicolor molding method according to the invention of claim 6, the second molded body made of the second resin is provided in the first molded body made of the first resin, and the second molded body excluding the design surface is removed. A method of molding a molded product whose periphery is surrounded by a first molded product, wherein a slide piece is formed in a cavity formed by a mold mold forming a design surface of the molded product and a core mold facing the mold mold. A step of injecting a first resin into the cavity from the first gate in a state where the core slide is advanced and the core slide is advanced to form a first molded body, and a resin passage between the core slide and the cavity by retracting the core slide. And forming the second molded body by injecting the second resin from the core mold side through the second gate to the first molded body with the slide piece retreating from the cavity and forming the second molded body. It is characterized by having.
[0031]
According to the invention of claim 6, since the core slide is in an advanced state at the time of molding the first molded body, the first resin does not go around the second gate, so that the second resin can move around the second gate. And the shape is good. In addition, since the second molded body is formed by injecting the second resin into the cavity together with the slide piece exiting from the cavity, no space remains on the back surface opposite to the design surface. . Thereby, a multicolor molded article having a good shape without impairing the design property can be molded with high strength.
[0032]
In the multicolor molding method according to the invention of claim 7, the second molded body made of the second resin is provided in the first molded body made of the first resin, and the second molded body excluding the design surface is provided. A method of molding a molded product whose periphery is surrounded by a first molded product, wherein a slide piece is formed in a cavity formed by a mold mold forming a design surface of the molded product and a core mold facing the mold mold. A step of injecting a first resin into the cavity from the first gate in a state where the core slide is advanced and the core slide is advanced to form a first molded body, and a resin passage between the core slide and the cavity by retracting the core slide. Forming a second molded body by injecting a second resin through the second gate from the core mold side to the first molded body together with the slide piece withdrawing from the inside of the cavity; Inject gas into the second compact Characterized in that it comprises a step.
[0033]
In the invention of claim 7, by injecting a gas further after injecting the second resin, it is possible to prevent sink marks, which are particularly likely to occur in a thick portion due to shrinkage of the second molded body during cooling, and It is possible to form a multicolor molded article having a good shape without deteriorating the design as well as improving the appearance.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the embodiments shown in FIGS. 1 to 5. In this embodiment, as shown in FIG. 6, a second molded body 3 made of a second resin is disposed in a first molded body 2 made of a first resin, and a second molded body 3 excluding the design surface 4 is formed. This is used for molding a molded article 1 having a shape in which the periphery of the molded body 3 is surrounded by the first molded body 2.
[0035]
FIG. 1 shows a mold 30 of this embodiment used for such molding, in which a mold mold 31 and a core mold 32 are arranged so as to face each other. These dies 31, 32 form a cavity 33 for molding the molded article 1 by being clamped. The molding surface 31 a on the cavity 33 side of the mold 31 is for molding the design surface 4 of the molded product 1.
[0036]
On the other hand, in the core mold 32, a first gate 34 for injecting the first resin into the cavity 33 is formed. The first resin is supplied to the first gate 34 through a spool 35 formed in the mold 31 and a runner 36 formed in the core 32.
[0037]
In this embodiment, a slide piece 37, a core slide 38, and a core pin 39 are incorporated.
[0038]
The slide piece 37 is movably inserted into a slide hole 31 a formed in the mold 31 so as to communicate with the cavity 33. The slide piece 37 constitutes a nest, so that its outer shape (shape) is formed into a shape corresponding to the second formed body 3. The slide piece 37 is positioned in the cavity 33 when the first resin is injected, and retreats from the cavity 33 after the first molded body is formed by the first resin. The retraction of the slide piece 37 is performed by appropriate means such as injection pressure of the second resin, driving of a hydraulic cylinder, operation of a wedge mechanism, and the like.
[0039]
The core slide 38 is inserted into a core hole 32a formed in the core mold 32. The core hole 32a is formed so as to face the cavity 33, and the core slide 38 is inserted into the core hole 32a so as to be linearly movable. In this embodiment, when the first resin is injected, the upper surface 38 a of the core slide 38 is flush with the molding surface of the core mold 32, but the core slide 38 is positioned higher and lower than the molding surface of the core mold 32. But it's fine.
[0040]
The core pin 39 extends through the core mold 32 and the core slide 38. The core pin 39 moves in the core slide 38 and the core mold 32 in a linear direction. This movement amount is adjusted to be larger than the movement amount of the core slide 38.
[0041]
In addition to the above, the second gate 40 is provided in the core mold 32 at a position different from that of the first gate 34. The second gate 40 is for injecting the second resin, and like the first gate 34, the second resin is supplied through the spool 41 and the runner 42. In this embodiment, the tip of the second gate 40 is bent in a direction away from the cavity 33, so that the gate port faces one side surface 38 b of the core slide 38.
[0042]
Next, molding of the molded article 1 in this embodiment will be described. Before injection, the mold is in the clamped state shown in FIG. In this closed state, the upper surface 38 a of the core slide 38 is stopped so as to be flush with the molding surface of the core mold 32, that is, so as to circumscribe the cavity 33. Thus, the second gate 40 is blocked by the side surface 38b of the core slide 38. The slide piece 37 has entered the cavity 33. Note that the core slide 38 may be stopped in a state where the core slide 38 is located in the cavity 33.
[0043]
FIG. 2 shows a state where the first resin 51 is injected with respect to the state of FIG. The first resin 51 is injected into the cavity 33 from the first gate 34, and is filled in the cavity 33. During the injection of the first resin 51, the second gate 40 is blocked by the side surface 38b of the core slide 38, so that the first resin 51 flows around the second gate 40 and flows backward. There is no. For this reason, a normal gate can be used as the second gate 40, and there is no need to use a complicated structure such as a valve gate, thereby making it possible to easily control the opening and closing of the gate.
[0044]
The first molded body 2 is formed by injecting the first resin 51. Thereafter, as shown in FIG. 3, the core slide 38 and the core pin 39 retreat in a direction away from the cavity 33. When the core slide 38 retreats in the direction of arrow A, it reaches the bottom of the core hole 32a and stops moving. As a result, the second gate 40 is opened, and the resin passage 52 is formed on the back surface of the first molded body 2.
[0045]
On the other hand, the core pin 39 retreats in the direction of the arrow B, and the retraction causes the core pin 39 to slip out of the first molded body 2. Therefore, after the core pin 39 comes off, a communication passage 53 communicating with the resin passage 52 is formed on the back surface side of the first molded body 2. In this state, as shown in FIG. 4, since the slide piece 37 moves in the direction of arrow C and retreats from the cavity 33, the slide piece retreat space 55 is formed inside the first molded body 2.
[0046]
As for the shape of the resin passage, it is considered that poor appearance of the primary molded body, for example, sink marks or uneven glossiness may occur due to shrinkage of the secondary resin. Therefore, the width of the resin passage, which is the passage of the secondary resin, is reduced. In addition, the depth is increased in order to secure the fluidity, and the communication passage is formed in a shape having a small cross-sectional area as long as the fluidity is not hindered.
[0047]
Then, when the second resin 54 is injected from the second gate 40, the second resin 54 reaches the communication passage 53 from the resin passage 52, is filled in the slide piece retreat space 55, and is hardened after the filling to cure. This is a molded article 3 of No. 2. Thereby, the molded body 1 in which the periphery of the second molded body 3 excluding the design surface 4 is surrounded by the first molded body 2 can be molded.
[0048]
FIG. 5 shows the molded body 1 immediately after being molded by this embodiment. In the molded body 1, a passage block 7 corresponding to the above-described resin passage 52 is formed on the back surface 5 side of the first molded body 2 opposite to the design surface 4, and the passage block 7 is removed. Thereby, the multicolor molded article 1 can be obtained. In this multi-color molded product 1, since the second resin 54 fills the communication path 53 formed by the core pin 39 coming off, no space remains on the back surface 5 opposite to the design surface 4. . For this reason, it can be set as the molded article which has intensity | strength and does not impair designability, and does not bend easily even if external force acts.
[0049]
In addition, in the molding according to this embodiment, the gate portion may have a thick shape, but in this case, after the resin is filled, the gate pin is operated to maintain the pressure-holding effect, so that the appearance of sink marks and the like is reduced. Defects can be reduced.
[0050]
In this embodiment, one slide piece 37 is used, but two or more slide pieces 37 may be incorporated. In this case, by providing the second gate 40 corresponding to each slide piece 37, it is possible to perform multicolor molding of three or more colors.
[0051]
FIG. 12 shows a mold according to another embodiment of the present invention. In this embodiment, a projection 38d is formed on a part of the core slide 38 so as to project in the direction of the core mold 32. An opening 32d for introducing the second resin 54 into the cavity 33 is formed in a portion of the core mold 32 corresponding to the protrusion 38d. The protruding portion 38d and the opening 32d have a shape in which they are in close contact with each other, and in this embodiment, both are formed in a conical shape.
[0052]
In this embodiment, the second gate 40 is shut off when the core slide 38 comes into close contact with the core mold 32. On the other hand, when the core slide 38 separates from the core mold 32, the opening 32d is opened. At the same time, a resin passage 52 that connects the cavity 33 and the second gate 40 is formed. In such an embodiment, there is an advantage that the structure is simplified and the control becomes easy because the core pin 39 is not required.
[0053]
【The invention's effect】
According to the first aspect of the present invention, when the first resin is injected, the core slide shuts off the second gate at a portion different from the cavity forming portion, so that the first resin flows around the second gate. There is no backflow. Therefore, it is not necessary to use a valve gate having a complicated structure as the second gate, and the control is facilitated. Also, since the second resin is filled into the slide piece retreat space from the resin passage to form the second molded body, the second resin is filled in the resin passage, and a space is provided on the back surface opposite to the design surface. A molded article having no parts remaining, having strength, and not deteriorating design properties can be obtained.
[0054]
According to the second aspect of the present invention, since the core slide blocks the second gate at a portion different from the cavity forming portion, the first resin does not flow back to the second gate and communicates with the resin passage. Can be formed in the first molded body, and since the second resin is filled in the communication path, there is no space remaining on the back surface opposite to the design surface, and it has strength, And it can be set as the molded article which does not spoil a design property.
[0055]
According to the third and fourth aspects of the invention, in addition to the effects of the first and second aspects of the invention, it is possible to cope with multicolor molding of three or more colors, and the versatility is improved.
[0056]
According to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4, it is possible to obtain a molded article having no sink even if there is a thick portion.
[0057]
According to the invention of claim 6, the first resin does not flow around the second gate, there is no backflow at the second gate, and a space portion remains on the back surface opposite to the design surface. Therefore, a multicolor molded article having a good shape without deteriorating the design can be molded with high strength.
[0058]
According to the seventh aspect of the present invention, after the second molded product is injected, the gap due to shrinkage is filled by gas injection, and a molded product without sink marks even when there is a thick portion can be obtained.
[Brief description of the drawings]
1A and 1B show a mold according to an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view of a main part, and FIG. 1B is a cross-sectional view in the orthogonal direction of FIG.
FIGS. 2A and 2B show an injection state of a first resin in one embodiment, wherein FIG. 2A is a cross-sectional view of a main part, and FIG. 2B is a cross-sectional view in the orthogonal direction of FIG.
3A and 3B show a state after molding of a first molded body in one embodiment, wherein FIG. 3A is a cross-sectional view of a main part, and FIG. 3B is a cross-sectional view in the orthogonal direction of FIG.
4A and 4B show an injection state of a second resin in one embodiment, wherein FIG. 4A is a cross-sectional view of a main part, and FIG. 4B is a cross-sectional view in the orthogonal direction of FIG.
FIG. 5 is a sectional view of a molded article.
6A and 6B show an example of a multicolor molded product, wherein FIG. 6A is a plan view and FIG. 6B is a longitudinal sectional view.
FIG. 7 is a cross-sectional view of a mold used for conventional multicolor molding.
8 is a cross-sectional view showing a state where a second resin is injected into the mold of FIG. 7;
FIG. 9 is a cross-sectional view of a molded article formed according to FIGS. 7 and 8;
FIG. 10 is a sectional view of another conventional mold used for multicolor molding.
FIG. 11 is a cross-sectional view showing a state where a second resin is injected into the mold of FIG.
FIG. 12 is a sectional view of a mold according to another embodiment of the present invention.
[Explanation of symbols]
1 Multicolor molded products
2 First molded body
3 Second molded body
4 Design side
5 Back
30 Multicolor Mold
31 Mold type
31a Mold surface of mold
32 core type
33 cavities
34 First Gate
37 slide pieces
38 core slides
39 core pins
40 Second Gate
51 First resin
52 resin passage
53 connecting passage
54 Second resin

Claims (7)

A second molded body made of the second resin is provided in a first molded body made of the first resin, and the periphery of the second molded body excluding the design surface is surrounded by the first molded body. A mold for molding an article,
A mold for molding the design surface of the molded article,
A core mold that forms a cavity for molding with the mold mold,
A slide piece having a shape corresponding to the second molded body and capable of moving forward and backward into the cavity;
A first gate for injecting a first resin into the cavity when the slide piece is located in the cavity;
A second gate provided on the core mold and injecting a second resin from a peripheral surface excluding the design surface;
A core that is movable forward and backward, is located in or circumscribes the cavity at a forward position, and forms part or all of a resin passage that communicates the slide piece and a second gate at a retracted position; A multicolor molding die, comprising: a slide; A second molded body made of the second resin is provided in a first molded body made of the first resin, and the periphery of the second molded body excluding the design surface is surrounded by the first molded body. A mold for molding an article,
A mold for molding the design surface of the molded article,
A core mold that forms a cavity for molding with the mold mold,
A slide piece having a shape corresponding to the second molded body and capable of moving forward and backward into the cavity;
A first gate for injecting a first resin into the cavity when the slide piece is located in the cavity;
A second gate provided on the core mold and injecting a second resin from a peripheral surface excluding the design surface;
A core slide that is movable forward and backward, is located in or circumscribes the cavity at a forward position, and forms a part of a resin passage that communicates the slide piece and a second gate at a retracted position; ,
And a core pin which is capable of moving back and forth into the cavity and which withdraws from the cavity after forming the first molded body to form the remaining portion of the resin passage. Mold. The multi-color molding die according to claim 1, wherein a plurality of the slide pieces are arranged. 3. The multicolor molding die according to claim 1, wherein the second gate is provided corresponding to one or more slide pieces. The multi-color molding die according to any one of claims 1 to 4, wherein the resin passage has a gas injection port. A second molded body made of the second resin is provided in a first molded body made of the first resin, and the periphery of the second molded body excluding the design surface is surrounded by the first molded body. A method of forming an article,
A slide piece is inserted into a cavity formed by a mold forming a design surface of a molded article and a core mold opposed to the mold, and a first gate is inserted into the cavity from the first gate with the core slide advanced. A step of injecting a resin to form a first molded body;
After the core slide is retracted to form a resin passage between itself and the cavity, the slide piece is withdrawn from the cavity and the second resin is injected from the core mold side through the second gate to the first molded body. A step of forming a second formed body. A second molded body made of the second resin is provided in a first molded body made of the first resin, and the periphery of the second molded body excluding the design surface is surrounded by the first molded body. A method of forming an article,
A slide piece is inserted into a cavity formed by a mold forming a design surface of a molded article and a core mold opposed to the mold, and a first gate is inserted into the cavity from the first gate with the core slide advanced. A step of injecting a resin to form a first molded body;
After the core slide is retracted to form a resin passage between itself and the cavity, the slide piece is withdrawn from the cavity and the second resin is injected from the core mold side through the second gate to the first molded body. A multicolor molding method, comprising: a step of molding a second molded body; and a step of injecting a gas into the second molded body.

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