JP5165486B2 - Injection mold and method of manufacturing resin molded product using the same - Google Patents

Description

  The present invention relates to an injection mold, and in particular, an injection mold that can be used for manufacturing a resin molded product in which a first sheet body is embedded and a second sheet body is formed on the surface simultaneously with injection molding, and The present invention relates to a method for producing a resin molded product using the same.

  In order to maintain the shape, there is a resin molded product in which a core material is embedded. The core material is completely embedded in the resin molded product or is partially exposed and embedded. As the core material, a material that is rigid in itself is used, and a metal plate, a hard resin plate, or the like is used. Such a resin molded product is manufactured by, for example, resin injection molding, and an injection mold used for the manufacturing and a manufacturing method thereof are disclosed (for example, see Patent Document 1). The injection mold includes a fixed mold, a movable mold having a parting surface with the fixed mold, and a slide mold (core pin) capable of moving in the mold clamping direction within the fixed mold. And the gate is provided in the side of the core material arrange | positioned at a cavity so that resin may flow into the both surfaces of the core material to be embedded.

A resin molded product in which a core material is embedded is manufactured using this injection mold. First, the core material is arranged at a predetermined position in a state where the mold is opened, and the mold is clamped so that the end portion of the core material is sandwiched between the fixed mold and the movable mold. Next, the slide mold is moved forward into the cavity so that the core material maintains a predetermined position, thereby holding the core material. Since the core material has rigidity, it is stably held at a predetermined position. Next, when the molten resin is injected into the cavity from the gate, the molten resin flows into the both sides of the core material, and when the molten resin is almost filled in the cavity, the slide core that holds the core material is held. Move the mold backward. Next, the molten resin is further injected to fill the entire cavity with the molten resin. Next, the inside of the cavity is held, and the molten resin filled in the cavity is cooled and solidified. Next, the mold is opened and the resin molded product is taken out from the mold. By such a manufacturing method, a resin molded product in which the core material is embedded is manufactured.
Japanese Patent Laid-Open No. 4-16316

  In the conventional injection mold as described above and a resin molded product manufacturing method using the same, when a sheet body, such as a film, which is not rigid itself is embedded in the resin molded product instead of the core material, It is difficult to fill the cavity with resin while maintaining the sheet body in a predetermined shape and position. Even if the sheet body is held in a state where it floats from the mold surface of the cavity, the sheet body itself does not have rigidity, so that the sheet body is displaced or wrinkled by the inflow of the resin into the cavity. Therefore, it is difficult to manufacture a resin molded product by embedding the sheet body in a predetermined shape and position. It is also difficult to manufacture a resin molded product in which one sheet body is embedded and another sheet body is formed on the surface at the same time as injection molding to expand the design variation composed of the two sheet bodies.

  The present invention has been made to solve the above-described problems, and a first sheet body that is not rigid in itself is embedded while being maintained in a predetermined shape and position, and at the same time as injection molding, the second sheet. An object of the present invention is to provide an injection mold used for manufacturing a resin molded product having a body formed on its surface and expanding design variations, and a method for manufacturing a resin molded product using the same.

  In order to achieve the above object, the first invention is for injection molding that can be used for manufacturing a resin molded product in which a first sheet body is embedded and a second sheet body is formed on the surface at the same time as injection molding. A cavity is formed between a first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body in a resin molded product is formed, and the first mold by clamping. A first mold or a second mold, the first mold or the second mold is capable of moving forward and backward in the mold clamping direction relative to the outer peripheral mold and the outer peripheral mold relative to the outer peripheral mold. A slide mold in which a second cavity surface corresponding to the other surface of the sheet body is formed, the first sheet body is disposed along the first cavity surface, and the second sheet body is disposed along the second cavity surface. Is placed and the slide mold has advanced in the clamped state A first gate into which a first resin is injected so as to form a first resin portion in a first partial cavity formed between the first sheet body and the second sheet body; After being fixed to the first resin portion, the slide mold is moved backward while holding the first resin portion, and the second portion is positioned between the first sheet body and the first cavity surface at the position where the slide mold is moved backward. A cavity is formed, and a second gate into which the second resin is injected so as to form a second resin portion is provided in the second partial cavity.

  With this configuration, the first sheet body is embedded between the first resin portion and the second resin portion while maintaining the shape of the second cavity surface, and the second sheet body is formed on the surface simultaneously with the injection molding. It is formed.

  According to a second invention, in the configuration of the first invention, the first resin and the second resin are the same resin, and the first gate and the second gate are the same gate.

  If comprised in this way, the number of the gates set in double molding will decrease.

  According to a third aspect of the present invention, there is provided a resin molded product in which the first sheet body is embedded and the second sheet body is formed on the surface simultaneously with the injection molding, using the injection mold of the first or second aspect of the invention. In the method, the first sheet body is disposed along the first cavity surface in a state where the mold is opened, and the second sheet body is disposed along the second cavity surface, and the second sheet body is disposed. A step of clamping the slide mold at a position where the slide mold is advanced to form a first partial cavity, and injecting the first resin into the formed first partial cavity via the first gate, A step of forming, a step of fixing the first sheet body and the second sheet body to the formed first resin portion, and a step of fixing the slide mold after the first sheet body is fixed to the first resin portion. Forming a second partial cavity by retracting in a state of holding the part; A step of injecting a second resin into the formed second partial cavity through a second gate to form a second resin portion, and fixing the formed second resin portion to the first sheet body. Is.

  With this configuration, the first sheet body is embedded between the first resin portion and the second resin portion while maintaining the shape of the first cavity surface, and the second sheet body is formed on the surface simultaneously with the injection molding. It is formed.

  In a fourth aspect based on the third aspect, the first resin and the second resin are the same resin.

  If comprised in this way, 1st resin and 2nd resin will weld each other, and adhesiveness will improve.

  5th invention WHEREIN: In the structure of 3rd or 4th invention, when 1st resin and 2nd resin are the same resin, 1st resin and 2nd resin are transparent or translucent, When the first resin and the second resin are different resins, at least one of the first resin and the second resin is transparent or translucent.

  If comprised in this way, the embedded 1st sheet | seat body will be visualized from the outside of a resin molded product.

  As described above, according to the first invention, the first sheet body is embedded between the first resin portion and the second resin portion while maintaining the shape of the second cavity surface, and at the same time as the injection molding. A two-sheet body is formed on the surface. For this reason, the first sheet body, which is not rigid in itself, is embedded while being maintained in a predetermined shape and position, and the design variation in which two sheet bodies with the second sheet body formed on the surface is configured simultaneously with injection molding is expanded. The resin molded product to be made can be manufactured.

  In the second invention, in addition to the effects of the first invention, the number of gates set in the double molding is reduced, so that the structure of the mold can be simplified.

  According to a third aspect of the invention, the first sheet body is embedded between the first resin portion and the second resin portion while maintaining the shape of the second cavity surface, and the second sheet body is on the surface simultaneously with the injection molding. It is formed. Therefore, a resin molded product in which a first sheet body, which is not rigid in itself, is embedded while being maintained in a predetermined shape and position, and two sheet bodies formed on the surface of the second sheet body are formed simultaneously with injection molding. Can be manufactured.

  In the fourth invention, in addition to the effect of the third invention, the first resin and the second resin are welded to each other to improve the fixing property, so that the quality of the resin molded product can be improved.

  In the fifth invention, in addition to the effects of the third or fourth invention, the embedded first sheet body is visualized from the outside of the resin molded product. It is possible to manufacture a resin molded product with a simple design. Further, if at least the first resin is transparent or translucent, the first sheet body and the second sheet body can be associated with each other in the design to produce resin molded products of various designs such as a three-dimensional design. it can.

  Next, embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a resin molded product manufactured using an injection mold according to the first embodiment of the present invention (1), and (2) is a first embodiment of the present invention. It is the figure which showed schematic structure of the injection die by this embodiment, Comprising: It is the longitudinal end view which cut | disconnected the cavity center.

  Referring to (1) of FIG. 1, a resin molded product 60 has a rectangular flat plate shape, a first resin portion 43 having a planar shape, and a first shape having a planar shape that is aligned with and overlaps the first resin portion 43. 2 resin parts 53. Between the first resin part 43 and the second resin part 53, an insert sheet 32 as a first sheet body is embedded, and the second sheet body is attached to the surface of the first resin part 43 at the same time as injection molding. An insert sheet 72 is formed. The resin molded product 60 has a shape having a planar expansion along the insert sheet 32. For example, a part of a casing of an electronic device such as a mobile phone or a personal computer, a part of a casing of a home appliance, an interior of a car Used for part of the panel. In the present invention, the first sheet body is embedded only when the entire surface including the end surface of the first sheet body is formed inside the resin molded product as shown in (1) of FIG. Instead, the end surface of the first sheet body is aligned with the end surface of the resin molded product and exposed to the outside, or the end portion of the first sheet body is formed in a state of being bent along the end surface of the resin molded product. This includes cases where

  Referring to (2) of FIG. 1, the injection mold 20 includes a fixed mold 21 and a movable mold 22 that forms a cavity 30 between the fixed mold 21 by mold clamping. The outer peripheral die 29 and the slide die 23 capable of moving forward and backward in the clamping direction relative to the outer peripheral die 29 in the outer peripheral die 29 are provided. In the state of FIG. 1, as shown by a two-dot chain line, the insert sheet 32 is embedded, and the cavity 30 corresponding to the resin molded product 60 on which the insert sheet 72 is formed is formed. In the injection mold 20, the fixed mold 21 constitutes a first mold, and the movable mold 22 constitutes a second mold.

  The fixed die 21 is formed with a first cavity surface 26 corresponding to a surface on one side of the insert sheet 32 in the resin molded product 60. A first gate 40 is formed at the upper center of the first cavity surface 26. From the first gate 40, a first resin that forms the first resin portion 43 of the resin molded product 60 and a second resin that forms the second resin portion 53 of the resin molded product 60 are injected. The first resin and the second resin are molten resins. The fixed mold 21 includes a first resin flow channel 41 connected to the first gate 40 and one nozzle touch portion 56 connected to the first resin flow channel 41 inside. The injection mold 20 employs a hot runner valve gate system. The first gate 40 is a valve gate, and drives a valve (not shown) to open and close the first gate 40 at a predetermined timing.

  The outer peripheral die 29 is provided with a recess in the center of the parting surface 25 for accommodating the slide die 23 so as to be slidable in the clamping direction. The slide mold 23 is formed with a second cavity surface 27 corresponding to a part of the surface on the other surface side of the insert sheet 32 in the resin molded product 60. A third cavity surface 28 that connects the first cavity surface 26 and the second cavity surface 27 is formed on the inner peripheral surface of the outer peripheral mold 29. The third cavity surface 28 corresponds to the outer peripheral end surface of the resin molded product 60. The cavity 30 is formed so as to be surrounded by the first cavity surface 26, the second cavity surface 27, and the third cavity surface 28.

  The slide mold 23 is set so as to move forward and backward in the fixed mold 21 so as to constitute a predetermined advanced position and retracted position. The predetermined advanced position is a position where the insert sheet 32 is embedded in the thickness direction of the resin molded product 60. The predetermined retracted position is a position for determining the thickness of the resin molded product 60.

  The fixed mold 21 and the movable mold 22 are respectively fixed to a fixed disk and a movable disk of an injection molding machine (not shown), and the slide mold 23 slides on the inner peripheral wall of the outer mold 29 while the outer peripheral mold 29 is guided by a tie bar (not shown). While being moved and guided, it is moved in the mold clamping direction by a driving means (not shown). The slide mold 23 can be moved forward and backward in the mold clamping direction relative to the outer peripheral mold. The first gate 40 is opened and closed by time control in accordance with the operation of the outer peripheral mold 29 and the slide mold 23.

  In the injection mold 20 configured as described above, the same resin is used as the first resin and the second resin, and one nozzle of an injection molding machine (not shown) is brought into contact with the nozzle touch part 56 to The first resin and the second resin are caused to flow into the cavity 30. The first resin and the second resin are injected from the first gate 40 through the first resin flow path 41 when the first gate 40 is opened.

  Next, the manufacturing method of the resin molded product 60 using the injection mold 20 will be described.

  Of the manufacturing steps of the resin molded product using the injection mold shown in FIG. 1, FIG. 2 is a diagram showing a step of opening the mold and arranging the first sheet body and the second sheet body. FIG. 3 is a diagram showing a process in which (1) clamps and forms a first partial cavity, and (2) injects a first resin into the first partial cavity to form a first resin portion. It is the figure which showed the process to do. FIG. 4 is a diagram showing a step (1) in which the slide mold is moved backward to form a second partial cavity, and (2) injects a second resin into the second partial cavity to produce a second resin portion. It is the figure which showed the process of forming. FIG. 5 is a view showing a step of taking out a resin molded product formed by opening the mold.

  Referring to FIG. 2, with the injection mold 20 opened, an insert sheet 32 is disposed at a predetermined position along the first cavity surface 26 of the fixed mold 21, and the second cavity of the slide mold 23 is placed. An insert sheet 72 is disposed at a predetermined position along the surface 27. The insert sheet 32 and the insert sheet 72 are positioned by, for example, providing a part protruding from the cavity 30 in the insert sheet 32 and the insert sheet 72, forming a hole in the protruding part, and attaching a positioning fixing pin corresponding to the hole to the party. The hole is formed on the clamping surface 24 and the parting surface 25, and the hole is fitted to the positioning fixing pin. The position of the insert sheet 32 and the insert sheet 72 is fixed by suction means (not shown) so that the insert sheet 32 is in close contact with the first cavity surface 26 and the insert sheet 72 is in close contact with the second cavity surface 27. Is called.

  Next, referring to (1) of FIG. 3, the mold is clamped at a position where the slide mold 23 on which the insert sheet 72 is arranged is advanced, and the first partial cavity is interposed between the insert sheet 72 and the insert sheet 32. 42 is formed. In other words, the mold is clamped at the position where the slide mold 23 is advanced, and the first partial cavity 42 is formed between the first cavity surface 26 and the second cavity surface 27. The first partial cavity 42 includes a space formed outward from the peripheral edges of the insert sheet 32 and the insert sheet 72. At this time, the first gate 40 is in a closed state.

  Next, referring to (2) of FIG. 3, the first gate 40 is opened, and the first resin is injected into the first partial cavity 42 via the first gate 40 to form the first resin portion 43. . Next, after the first resin is completely filled in the first partial cavity 42, the first gate 40 is closed. Next, the insert sheet 32 and the insert sheet 72 are fixed to the first resin portion 43, and pressure holding and cooling are performed until the first resin portion 43 has a predetermined hardness. This predetermined hardness is such a hardness that the first resin portion 43 is not deformed by the pressure of the second resin to be injected next.

  Next, referring to (1) of FIG. 4, after the insert sheet 32 is fixed to the first resin portion 43, the slide mold 23 is retracted to a predetermined position while holding the first resin portion 43. Thus, the second partial cavity 52 is formed between the insert sheet 32 and the first cavity surface 26 of the fixed mold 21. A space formed outward from the peripheral edge of the insert sheet 32 is also included in the second partial cavity 52.

  Next, referring to (2) of FIG. 4, the first gate 40 is opened again, and the second resin is injected into the second partial cavity 52 through the first gate 40 to form the second resin portion 53. To do. Then, the insert sheet 32 is fixed to the second resin portion 53, and pressure holding and cooling are performed until the second resin portion 53 and the first resin portion 43 are integrated.

  Next, referring to FIG. 5, the mold is opened and the resin molded product 60 is taken out. In this manner, the resin molded product 60 in which the insert sheet 32 is embedded and the insert sheet 72 is formed on the surface simultaneously with the injection molding is manufactured.

  Next, the types of the insert sheet 32, the insert sheet 72, the first resin, and the second resin will be described.

  As the insert sheet 32 and the insert sheet 72, resin sheets such as polyethylene terephthalate (PET), acrylic (PMMA), polycarbonate (PC), acrylonitrile / butadiene / styrene (ABS) are used. If a resin sheet made of the same type of resin as the first resin or the second resin is used, the insert sheet 32 or the insert sheet 72 is easily welded and fixed to the first resin portion or the second resin portion. For example, a pattern layer is formed on the resin sheet. The design layer is formed on the entire surface of the resin sheet or partially formed depending on the design to be expressed. Moreover, an adhesive layer may be formed on the resin sheet as necessary. If the adhesive layer is formed, the first resin, the second resin, and the resin sheet adhere to each other, and the integrity of the resin molded product can be improved. The insert sheet 32 and the insert sheet 72 may be made of a material other than resin, such as paper or metal, as long as it is a sheet instead of the resin sheet.

  The pattern layer is formed of a colored ink containing a resin and a coloring material such as a pigment or a dye. Resins used as binders include polyvinyl resins, polyamide (PA) resins, polyester resins, PMMA resins, polyurethane resins, polyvinyl acetal resins, polyester urethane resins, cellulose ester resins, alkyd resins, etc. is there. The pattern layer is printed on the resin sheet by a gravure printing method, a screen printing method, an offset printing method, or the like. When it is desired to express metallic luster as a pattern, the pattern layer is composed of a metal thin film layer formed by a vacuum deposition method, a sputtering method, an ion plating method, a plating method or the like.

  For the adhesive layer, a heat-sensitive or pressure-sensitive resin suitable for the type of the first resin and the second resin is used. If the first resin and the second resin are PMMA resins, for example, the PMMA resin may be used for the adhesive layer. If the first resin and the second resin are PC and polystyrene (PS) resins, for example, the PMMA, PS, and PA resins having an affinity for these resins may be used for the adhesive layer. The adhesive layer is printed on the resin sheet by a gravure coating method, a roll coating method, a comma coating method, a gravure printing method, a screen printing method, an offset printing method, or the like.

  As the first resin and the second resin, materials suitable for products in which the resin molded product 60 is used are used. For example, ABS, PMMA, PS, styrene acrylonitrile (AS), PC, polyvinyl chloride (PVC), PP, PET resin and the like. By using a transparent or translucent resin for the first resin and the second resin, the insert sheet 32 itself and the pattern layer formed on the insert sheet 32 can be visually recognized from the outside of the resin molded product. In this invention, translucent resin is resin of the state which can visually recognize the insert sheet 32 embed | buried under the resin molded product 60 from the exterior of the resin molded product 60 except transparent resin. If a resin sheet made of the same resin as the first resin or the second resin is used for the insert sheet 32, the first resin or the second resin and the resin sheet are welded when the resin molded product 60 is molded. It can be made easy to fix.

  From the above, in the method of manufacturing the resin molded product 60 using the injection mold 20 configured as described above, the first resin portion 43 and the first resin portion 43 are maintained while the insert sheet 32 is maintained in the shape of the first cavity surface 26. The insert sheet 72 is formed on the surface simultaneously with the injection molding while being embedded between the two resin portions 53. Therefore, the insert sheet 32 that is not rigid in itself is embedded while being maintained in a predetermined shape and position, and the insert sheet 72 is formed on the surface. The resin molded product to be made can be manufactured. In addition, since the first resin and the second resin are the same type of resin, and the first resin and the second resin are injected from the same gate, the number of gates set in the injection mold 20 Less. Therefore, the number of resin flow paths connected to the gate is reduced, and the structure of the injection mold 20 can be simplified.

  Furthermore, if a transparent or translucent resin is used for the first resin and the second resin, the embedded insert sheet 32 is visualized from the outside of the resin molded product 60. Therefore, by designing the insert sheet 32, resin molded products 60 having various designs can be manufactured. If the insert sheet 32 and the insert sheet 72 are associated with each other in design, the resin molded product 60 having various designs can be manufactured. In addition, since the insert sheet 32 and the insert sheet 72 are configured with a predetermined interval between the first resin portions 43, the resin molded product 60 having a three-dimensional design can be manufactured. Furthermore, if an insert sheet 32 that exhibits functions such as releasing and absorbing heat and blocking electromagnetic waves is embedded, a resin molded product 60 having such functions can be manufactured. The first resin and the second resin are the same resin, and the first resin and the second resin are welded to each other to improve the adhesion, so that the quality of the resin molded product 60 can be improved.

  FIG. 6 is a longitudinal sectional view of a resin molded product manufactured by using an injection mold according to the second embodiment of the present invention (1), and (2) is a second embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by this embodiment, Comprising: It is the longitudinal end view which cut | disconnected the cavity center, and is a figure corresponding to FIG. 1 of previous 1st Embodiment. FIG. 7 shows a step (1) of injecting the first resin into the first partial cavity to form the first resin part in the manufacturing process of the resin molded product using the injection mold shown in FIG. It is the figure which showed the process, The figure (2) is the figure which showed the process of injecting 2nd resin to a 2nd partial cavity, and forming a 2nd resin part, The figure of previous 1st Embodiment 5 corresponds to (2) of FIG. 3 and (2) of FIG. FIG. 8 is a diagram showing a step of taking out a resin molded product formed by opening the mold among the steps of manufacturing a resin molded product using the injection mold shown in FIG. FIG. 6 is a diagram corresponding to FIG. 5 of the embodiment. Since the basic configuration is the same as that of the injection mold 20 according to the first embodiment, different points will be mainly described.

  Referring to (1) of FIG. 6, in the resin molded product 60 according to the first embodiment, the first resin portion 43 and the second resin portion 53 are aligned and overlapped, but the second embodiment In the resin molded product 81 according to the form, the second resin portion 53 is large so as to extend downward from the first resin portion 43. Further, the positional relationship among the insert sheet 72, the first resin portion 43, and the second resin portion 53 is reversed with respect to the insert sheet 32. Referring to (2) of FIG. 6, in the injection mold 20 according to the first embodiment, the movable mold 22 includes the outer peripheral mold 29 and the slide mold 23. However, according to the second embodiment. In the injection mold 80, the fixed mold 21 includes an outer peripheral mold 29 and a slide mold 23. In addition to the first gate 40, a second gate 50 is formed in the cavity 30. In the injection mold 80, the movable mold 22 constitutes a first mold, and the fixed mold 21 constitutes a second mold.

  The slide mold 23 includes a rectangular flat plate-shaped base portion 82 and a convex portion 83 protruding from the substantially center of the base portion toward the mold clamping direction movable die 22 side. The outer peripheral die 29 has a rectangular flat plate shape, and a through-hole into which the convex portion 83 of the slide die 23 is inserted so as to slide is formed substantially at the center. The substantially center of the parting surface 25 of the movable mold 22 constitutes the first cavity surface 26 corresponding to the one surface side surface of the insert sheet 32 in the resin molded product 81, and the tip surface of the convex portion 83 is the resin molded product. A second cavity surface 27 corresponding to the surface on the other surface side of the insert sheet 32 in 81 is configured. A third cavity surface 28 that connects the first cavity surface 26 and the second cavity surface 27 is formed on the peripheral wall of the through hole of the outer peripheral mold 29.

  The lower portion of the second cavity surface 27 comes into contact with the parting surface 25 of the movable die 22 at a position where the slide die 23 is advanced relative to the outer peripheral die 29. The first gate 40 is set at the upper center of the second cavity surface 27, and the second gate 50 is set at the lower center of the second cavity surface 27 in contact with the parting surface 25 as described above. The first resin forming the first resin portion 43 of the resin molded product 81 is injected from the first gate 40, and the second resin forming the second resin portion 53 of the resin molded product 81 is injected from the second gate 50. Is ejected. The slide mold 23 includes a first resin flow channel 41 connected to the first gate 40, a second resin flow channel 51 connected to the second gate 50, a first resin flow channel 41, and a first resin flow channel. 2 resin flow paths 51 are joined together and connected to a common resin flow path 55, and one nozzle touch portion 56 connected to the common resin flow path 55 is provided on the outer surface. The injection mold 80 also employs a hot runner valve gate system, similar to the injection mold 20. The first gate 40 and the second gate 50 are valve gates, and a valve (not shown) is driven to open and close the first gate 40 and the second gate 50 at a predetermined timing.

  The outer peripheral mold 29 is movable so as to move forward and backward in the mold clamping direction. The slide mold 23 is fixed to a stationary platen of a molding machine (not shown) and is not substantially movable. However, when viewed from the outer peripheral mold 29, the slide mold 23 is movable relative to the outer peripheral mold 29 so as to move forward and backward in the mold clamping direction. When the second partial cavity 52 is formed, the outer peripheral mold 29 is integrated with the movable mold 22 and retracts in the mold clamping direction, and the inner peripheral wall of the through hole of the outer peripheral mold 29 extends along the outer peripheral wall of the convex portion 83 of the slide mold 23. And so on.

  In the method of manufacturing the resin molded product 81 using the injection mold 80, referring to FIG. 7A, the insert sheet is placed at a predetermined position along the first cavity surface 26 of the movable mold 22. 32, and the mold is clamped at the position where the slide mold 23 is advanced from the state where the insert sheet 72 is disposed at a predetermined position along the second cavity surface 27 of the slide mold 23, and the insert sheet 32 and the insert A first partial cavity 42 is formed between the sheet 72 and the sheet 72. Next, the first gate 40 is opened, and the first resin is injected into the first partial cavity 42 through the first gate to form the first resin portion 43. Thereafter, after going through the same steps as in the first embodiment, referring to (2) of FIG. 7, the insert sheet 32 is fixed to the first resin portion 43 and then relative to the outer peripheral mold 29. Then, the slide mold 23 is retracted to a predetermined position to form the second partial cavity 52 between the insert sheet 32 and the first cavity surface 26. Next, the second gate 50 is opened, and the second resin is injected into the second partial cavity 52 through the second gate 50 to form the second resin portion 53. Thereafter, after the same steps as in the first embodiment, the mold is opened and the resin molded product 81 is taken out with reference to FIG. Thus, the resin molded product 81 in which the insert sheet 32 is embedded and the insert sheet 72 is formed on the surface is manufactured.

  In the method of manufacturing the resin molded article 81 using the injection mold 80 configured as described above, the insert sheet 32 that is not rigid in itself has a predetermined shape and position as in the first embodiment. It is possible to manufacture a resin molded product 81 that expands the design variation in which two sheet bodies that are embedded while being maintained and the insert sheet 72 is formed on the surface are configured simultaneously with injection molding. If a transparent or translucent resin is used for at least one of the first resin and the second resin, the embedded insert sheet 32 is visualized from the outside of the resin molded product 81. Therefore, by designing the insert sheet 32, resin molded products 81 having various designs can be manufactured. Further, if the first resin flow channel 41 and the second resin flow channel 51 are not connected by the common resin flow channel 55 but individual nozzle touch portions 56 are set in the respective resin flow channels, the first resin and the first resin flow channel 51 are connected. A resin different from the two resins can be used. If the insert sheet 32, the insert sheet 72, the first resin, and the second resin are related in design, resin molding of various designs including a three-dimensional design is possible. Article 81 can be manufactured.

  In the injection mold 80, the slide mold 23 moves forward and backward relative to the outer peripheral mold 29, but is substantially fixed to a stationary platen of the molding machine and is stationary. It operates in conjunction with the movable mold 22. Therefore, the slide mold 23 can be moved relative to the outer mold 29 so as to be able to move forward and backward by operation control by the mold clamping device of the molding machine without using other driving means such as an air cylinder. In addition, since the slide mold 23 is not formed on the movable mold 22, the movable mold 22 can have a simple structure.

  In each of the above embodiments, a non-rigid sheet body is used. However, if the sheet body can be disposed along the first cavity surface or the second cavity surface, a rigid sheet body may be used. Good.

  In the first embodiment described above, one first gate is set, but a plurality of first gates may be set.

  Furthermore, in the second embodiment, one each of the first gate and the second gate is set, but a plurality of first gates and a plurality of second gates may be set.

  Furthermore, in the second embodiment, the first resin flow path and the second resin flow path are branched from the common resin flow path. However, the first resin flow path and the second resin flow path Each may be formed independently.

(1) is a longitudinal sectional view of a resin molded product manufactured using an injection mold according to the first embodiment of the present invention, and (2) is a first embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center. It is the figure which showed the process of mold-opening and arrange | positioning a 1st sheet body and a 2nd sheet body among the manufacturing processes of the resin molded product using the metal mold | die for injection molding shown in FIG. FIG. 2 is a diagram showing a process of forming a first partial cavity by clamping the mold (1) in the manufacturing process of the resin molded product using the injection mold shown in FIG. FIG. 5 is a diagram illustrating a process of injecting a first resin into a first partial cavity to form a first resin portion. FIG. 2 is a diagram showing a step of forming a second partial cavity by retreating the slide mold in the manufacturing process of a resin molded product using the injection mold shown in FIG. 2) is a diagram showing a step of injecting a second resin into a second partial cavity to form a second resin portion. It is the figure which showed the process of taking out the resin molded product shape | molded by opening the mold among the manufacturing processes of the resin molded product using the injection mold shown in FIG. (1) is a longitudinal sectional view of a resin molded product manufactured using an injection mold according to the second embodiment of the present invention, and (2) is a second embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center. Of the manufacturing steps of the resin molded product using the injection mold shown in FIG. 6, (1) shows the step of injecting the first resin into the first partial cavity to form the first resin portion. (2) is a view showing a step of injecting a second resin into a second partial cavity to form a second resin portion. It is the figure which showed the process of taking out the resin molded product shape | molded by opening the mold among the manufacturing processes of the resin molded product using the injection mold shown in FIG.

Explanation of symbols

20, 80 Injection mold 21 Fixed mold 22 Movable mold 23 Slide mold 26 First cavity surface 27 Second cavity surface 29 Peripheral mold 30 Cavity 32, 72 Insert sheet 40 First gate 42 First partial cavity 43 First resin Part 50 Second gate 52 Second partial cavity 53 Second resin part 60, 81 Resin molded product

Claims (4)

An injection mold that can be used for manufacturing a resin molded product in which a first sheet body is embedded and a second sheet body is formed on the surface simultaneously with injection molding,
A movable mold formed with a first cavity surface corresponding to a surface on one side of the first sheet body in the resin molded product;
A fixed mold that forms a cavity with the movable mold by clamping,
The fixed mold can move forward and backward in the clamping direction relative to the outer peripheral mold and the outer peripheral mold in the outer peripheral mold, and corresponds to the other surface of the first sheet body in the resin molded product And a slide mold on which a second cavity surface is formed,
The first sheet body is disposed along the first cavity surface, the second sheet body is disposed along the second cavity surface, and the slide mold is relative to the outer periphery mold in a clamped state. A first gate through which a first resin is injected to form a first resin portion in a first partial cavity formed between the first sheet body and the second sheet body at a position advanced forward ,
After the first sheet body is fixed to the first resin part, the outer peripheral mold is operated in conjunction with the operation of the movable mold, whereby the slide mold is held in the state where the first resin part is held. A second partial cavity is formed between the first sheet body and the first cavity surface at a position where the slide mold is retracted relative to the outer peripheral mold, and the second partial cavity is formed in the second partial cavity. An injection mold comprising: a second gate into which the second resin is injected so as to form the second resin portion. A method for producing a resin molded product using the injection mold according to claim 1, wherein the first sheet body is embedded, and the second sheet body is formed on the surface simultaneously with the injection molding,
Disposing the first sheet body along the first cavity surface in a mold-opened state, and disposing the second sheet body along the second cavity surface;
Forming the first partial cavity by clamping the slide mold on which the second sheet body is disposed at a position advanced relative to the outer peripheral mold; and
Injecting a first resin into the formed first partial cavity through the first gate to form a first resin portion;
Fixing the first sheet body and the second sheet body to the formed first resin portion ;
After the first sheet body is fixed to the first resin portion, the slide mold is held in a state where the first resin portion is held by operating the outer peripheral mold in conjunction with the operation of the movable mold. Retreating relative to the outer peripheral mold to form the second partial cavity;
Injecting a second resin into the formed second partial cavity through the second gate to form a second resin portion, and fixing the formed second resin portion to the first sheet body; The manufacturing method of the resin molded product provided with. The method for producing a resin molded product according to claim 2, wherein the first resin and the second resin are the same resin . When the first resin and the second resin are the same resin, the first resin and the second resin are transparent or translucent, and the first resin and the second resin are different. 4. The method for producing a resin molded product according to claim 2, wherein when the resin is a resin, at least one of the first resin and the second resin is transparent or translucent . 5.

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