WO2009123226A1

WO2009123226A1 - Mold for injection molding and process for producing molded resin using the same

Info

Publication number: WO2009123226A1
Application number: PCT/JP2009/056730
Authority: WO
Inventors: 豊岡尚登; 浦勇樹; 嵯峨山洋介; 吉田剛規; 上林弘明
Original assignee: 日本写真印刷株式会社
Priority date: 2008-04-03
Filing date: 2009-03-31
Publication date: 2009-10-08
Also published as: TW200948580A

Abstract

A mold (20) for injection molding which comprises: a first die (21) having a first cavity surface (26) formed thereon; a second die (22) which forms a cavity between the die (22) and the first die (21) upon clamping; and a slide die (23) which has a second cavity surface (27) formed thereon and which can be moved forward and backward in the clamping direction within the second die (22). The mold (20) has: a first gate (40) through which a first resin is injected into a first partial cavity (42) formed between the first cavity surface (26) and a first sheet (13) disposed along the second cavity surface (27), the first partial cavity (42) being formed when the slide die (23) is in the forward position in the clamped-state mold; and a second gate (50) through which a second resin is injected into a second partial cavity (52) formed between the first sheet (13) and the second cavity surface (27) after the first resin part (14) has been bonded to the first sheet (13), by moving the slide die (23) backward to the backward position.

Description

Injection mold and method of manufacturing resin molded product using the same

The present invention relates to an injection mold, particularly for the production of a resin molded product in which a first sheet body is embedded, or a first sheet body is embedded and a second sheet body is formed on the surface simultaneously with injection molding. The present invention relates to an injection mold used and a method for producing a resin molded article using the same.

There is a resin molded product with a core material embedded inside to maintain its shape. 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, the molten resin is injected from the gate into the cavity, and 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 mold that holds the core material Move 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.
JP-A-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 in order to solve the above-described problems. A resin molded product, a first sheet body, which is embedded while a first sheet body having no rigidity in itself is maintained in a predetermined shape and position. A mold for injection molding used in the manufacture of a resin molded product with an expanded design variation in which a second sheet body is formed on the surface simultaneously with injection molding and a method of manufacturing a resin molded product using the same The purpose is to provide.

In order to achieve the above object, a first invention is an injection mold that can be used for manufacturing a resin molded product in which a first sheet body is embedded, and the first sheet body in the resin molded product. A first mold in which a first cavity surface corresponding to the one surface side of the first mold is formed, a second mold in which a cavity is formed between the first mold by mold clamping, and in the first mold or the second mold A slide mold in which a second cavity surface corresponding to at least a part of the other surface of the first sheet body in the resin molded product is formed, and along the second cavity surface The first resin member is formed in the first partial cavity formed between the first sheet body and the first cavity surface at the position where the first sheet body is disposed and the slide mold is advanced in the clamped state. A first gate from which the first resin is injected; After the one sheet body is fixed to the first resin portion, the slide mold is retracted, and a second partial cavity is formed between the first sheet body and the second cavity surface at the position where the slide mold is retracted. The second partial cavity includes a second gate through which the second resin is injected so as to form a second resin portion.

When configured in this manner, 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.

According to a second invention, in the configuration of the first invention, the first gate is set at substantially the center of the first cavity surface.

With this configuration, the resin flows into the first partial cavity from the center of the sheet toward the periphery.

According to a third invention, in the configuration of the first or second invention, a third cavity surface corresponding to an end surface of the resin molded product is formed in at least one of the second die and the slide die, and the second gate is The third cavity surface is set.

With this configuration, the resin flow path connected to the second gate inward from the slide-type second cavity surface is not formed.

A fourth invention is 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 at the same time as injection molding. A first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body is formed, a second mold for forming a cavity between the first mold by clamping, and a second mold A slide mold in which a second cavity surface corresponding to at least a part of the other surface of the first sheet body in the resin molded product is formed, and is movable along the first cavity surface. The second sheet body is disposed, and the first sheet body is disposed along the second cavity surface, and is formed between the first sheet body and the second sheet body at a position where the slide mold is advanced in the mold clamping state. The first resin portion in the first partial cavity The first gate from which the first resin is injected so as to form the first sheet body, and after the first sheet body is fixed to the first resin portion, the slide mold is retracted, and the first sheet body is at the position where the slide mold is retracted. A second partial cavity is formed between the first cavity surface and the second cavity surface, and the second partial cavity is provided with a second gate through which the second resin is injected so as to form a second resin portion. .

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 fifth invention, in the configuration of the fourth invention, the second sheet body is sequentially arranged at a predetermined position in the mold formed at a predetermined interval on the transfer sheet fed into the mold. It is a transfer layer.

With this configuration, the transfer layer is continuously transferred to the resin molded product simultaneously with the injection molding for each resin molded product to be manufactured.

According to a sixth aspect of the present invention, in the configuration of any one of the first, fourth, and fifth aspects, of the first partial cavity and the second partial cavity, the side opposite to the nozzle touch part side that the nozzle of the injection molding machine contacts. The partial cavity located at the side has a portion protruding outward by a predetermined size from the partial cavity located on the nozzle touch part side when viewed from the mold clamping direction.

With this configuration, a surface on the nozzle touch part side having a predetermined size is formed in a partial cavity located on the side opposite to the nozzle touch part side.

A seventh invention is 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 at the same time as injection molding. A first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body is formed, and a second mold that forms a cavity between the first mold by clamping, The mold or the second mold can move forward and backward in the clamping direction relative to the outer peripheral mold and the outer peripheral mold relative to the outer peripheral mold, and corresponds to the surface on the other side of the first sheet body in the resin molded product And a slide mold in 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, The first sheet body and the second seat at the position where the slide mold has advanced. 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 body and the first sheet body, The slide mold is retracted while holding the first resin portion, and a second partial cavity is formed between the first sheet body and the first cavity surface at the position where the slide mold is retracted. The second partial cavity And a second gate through which the second resin is injected so as to form the second resin portion.

In an eighth aspect based on the seventh aspect, the first resin and the second resin are the same resin, and the first gate and the second gate are the same gate.

If configured in this way, the number of gates set in the double molding is reduced.

A ninth invention is a method of manufacturing a resin molded product in which the first sheet body is embedded, using the injection mold according to any one of the first to third inventions, and the mold is opened in a state where the mold is opened. A step of arranging the first sheet body along the two-cavity surface, a step of forming a first partial cavity by clamping the slide mold on which the first sheet body is disposed at a position advanced, and Injecting the first resin into the first partial cavity via the first gate to form the first resin part, fixing the first sheet body to the formed first resin part, and the first resin part A step of forming the second partial cavity by retracting the slide mold after the first sheet body is fixed to the second sheet body, and injecting the second resin into the formed second partial cavity via the second gate to form a second A resin part is formed, and the formed second resin part is fixed to the first sheet body. It is obtained by a step of.

A tenth aspect of the present invention is a method 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, using the injection mold of the fourth or fifth aspect of the invention. A method in which the second sheet body is disposed along the first cavity surface in a state where the mold is opened, the first sheet body is disposed along the second cavity surface, and the first 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, a step of retracting the slide mold after the first sheet body is fixed to the first resin portion, Forming a two-part cavity, and a formed second partial cavity To by injecting a second resin through a second gate to form the second resin part is a second resin part which is the form that a step of fixing the first sheet member.

The eleventh aspect of the invention is the production of 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 molding die of the seventh or eighth 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 the second partial cavity by retracting the part while holding the part 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. It is a thing.

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 twelfth aspect according to any one of the ninth to eleventh aspects, at least one of the first resin and the second resin is transparent or translucent.

When configured in this manner, the embedded first sheet body is visualized from the outside of the resin molded product.

In a thirteenth invention according to any of the ninth to twelfth inventions, the first resin and the second resin are the same resin.

With this configuration, the first resin and the second resin are welded to each other to improve the adhesion.

As described above, in 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. Therefore, it is possible to manufacture a resin molded product in which the first sheet body which is not rigid in itself is embedded in a predetermined shape and position.

In the second invention, in addition to the effect of the first invention, since the resin flows into the first partial cavity from the center of the first sheet body toward the periphery, the first sheet body is injected by injection of the first resin. Deviations and wrinkles can be prevented.

In the third aspect of the invention, in addition to the effects of the first or second aspect of the invention, the resin flow path connected to the second gate inward from the second cavity surface of the slide mold is not formed. The structure can be simplified.

According to a fourth 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 formed on the surface simultaneously with the injection molding. It is formed. 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. Can produce resin molded products

In the fifth invention, in addition to the effects of the fourth invention, since the transfer layer is transferred to the resin molded product simultaneously with the injection molding for each resin molded product to be manufactured, Placement on the mold becomes efficient.

In the sixth aspect of the invention, the nozzle touch part side surface having a predetermined size is formed in the partial cavity located on the opposite side of the nozzle touch part side. Therefore, in addition to the effects of the first, fourth and fifth inventions, a gate can be set on the surface, and the resin flow path connected to the gate is linear in the mold clamping direction. Can be set to Furthermore, if it is a hot runner, a gate design becomes easy, without generating unnecessary gate members other than a resin molded product.

In the seventh 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 formed on the surface simultaneously with the injection molding. It is formed. 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 eighth invention, in addition to the effects of the seventh invention, the number of gates set in the double molding is reduced, so that the structure of the mold can be simplified.

In the ninth 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. Therefore, it is possible to manufacture a resin molded product in which the first sheet body which is not rigid in itself is embedded in a predetermined shape and position.

According to a tenth 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 formed 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 an eleventh 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 formed 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 twelfth invention, in addition to the effects of any of the ninth to eleventh inventions, the embedded first sheet body is visualized from the outside of the resin molded product, and therefore the first sheet body is designed. Thus, resin molded products having various designs can be manufactured. Moreover, when it has a 2nd sheet | seat body, if a 1st sheet | seat body and a 2nd sheet | seat body are linked | related on a design, the resin molded product of various designs can be manufactured further.

In the thirteenth invention, in addition to the effects of any one of the ninth to twelfth inventions, the first resin and the second resin are welded to each other to improve the adhesiveness, thereby improving the quality of the resin molded product. be able to.

FIG. 3 is an external perspective view of a chair manufactured using the injection mold according to the first embodiment of the present invention, and (2) is an I--shown in (1). It is sectional drawing of I line, (3) is sectional drawing corresponding to the (2) which showed the modification. These are the figures which showed schematic structure of the injection die by 1st Embodiment of this invention, Comprising: The (1) is the vertical end view which cut | disconnected the cavity center, The (2) is a cavity It is the lateral end view which cut | disconnected the center. These are the figures which showed the process of mold-opening and arrange | positioning a sheet | seat among the manufacturing processes of the chair shown in FIG. These are figures which showed the process of mold-clamping and forming the 1st resin part among the manufacturing processes of the chair shown in FIG. These are the figures which showed the process of core-backing and forming the 2nd resin part among the manufacturing processes of the chair shown in FIG. These are the figures which showed the process of opening a type | mold and taking out the molded chair among the manufacturing processes of the chair shown in FIG. These are the top views which show the external shape of the sheet | seat used for manufacture of the chair which the (1) showed in FIG. 2, and the (2) is a top view corresponding to the (1) which showed the modification. (3) is a longitudinal sectional view showing the outer shape of a sheet showing still another modified example. These are figures which show schematic structure of the injection mold by 2nd Embodiment of this invention, and are the longitudinal end views which cut | disconnected the cavity center. (1) is a longitudinal sectional view of a resin molded product manufactured using an injection mold according to the third embodiment of the present invention, and (2) is a third embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by the form of this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center. These are the figures 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. 10 is a diagram showing a step (1) of forming a first partial cavity by clamping the die among manufacturing steps of a resin molded product using the injection mold shown in FIG. 2) is a view showing a process of forming a first resin portion by injecting a first resin into a first partial cavity. FIG. These are the figures which showed the process in which the (1) retreats a slide type | mold and forms a 2nd partial cavity among the manufacturing processes of the resin molded product using the metal mold | die for injection molding 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. These are the figures 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 fourth embodiment of the present invention, and (2) is a fourth embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by a form, Comprising: It is the vertical end view which cut | disconnected the cavity center. Is a step of (1) injecting the first resin into the first partial cavity to form the first resin part in the resin molded product manufacturing process using the injection mold shown in FIG. (2) is a diagram showing a step of injecting a second resin into the second partial cavity to form a second resin portion. These are figures which showed schematic structure of the injection die by 5th Embodiment of this invention, and are the longitudinal end views which cut | disconnected the cavity center. (1) is a longitudinal sectional view of a resin molded product manufactured using an injection mold according to the sixth embodiment of the present invention, and (2) is a sixth embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by the form of this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center. FIG. 18 is a diagram showing a step of opening the mold and arranging the first sheet body and the second sheet body in the manufacturing process of the resin molded product using the injection mold shown in FIG. 17. FIG. 18 is a diagram showing a step (1) in which the first partial cavity is formed by clamping the die among the steps of manufacturing a resin molded product using the injection mold shown in FIG. FIG. 9 is a view showing a step of forming a first resin portion by injecting a first resin into a first partial cavity. FIG. 18 is a diagram showing a step (1) of forming a second partial cavity by retreating the slide die among the steps of manufacturing 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. These are the figures which showed the process of taking out the resin molded product 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 seventh embodiment of the present invention, and (2) is a seventh embodiment of the present invention. It is the figure which showed schematic structure of the injection mold by the form of this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center. Is a step of (1) injecting the first resin into the first partial cavity to form the first resin portion in the manufacturing process of the 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. These are the figures 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.

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

[First Embodiment]
FIG. 1 is an external perspective view of a chair manufactured using the injection mold according to the first embodiment of the present invention (1), and (2) is an I shown in (1). FIG. 14 is a cross-sectional view taken along the line −I, and (3) is a cross-sectional view corresponding to (2) of the modified example.

Referring to (1) of FIG. 1, the chair 10 has a shape in which a substantially rectangular flat plate is bent at a central portion with the longitudinal direction as a bending direction. It is composed of a backrest 12 that rises integrally. The seat portion 11 and the backrest portion 12 are formed in a gently curved surface so that the seat surface and the backrest surface slightly sink toward the inside in a direction orthogonal to the bending direction. When the seat portion 11 and the backrest portion 12 are formed in this manner, the position of the sitting person is guided inward, so that the position of the sitting person can be stabilized. Moreover, the backrest part 12 is formed so that a width | variety may become slightly narrow as the upper part goes upwards.

Next, referring to (2) of FIG. 1, the cross section of the seat portion 11 is formed on one surface of the insert sheet 13 so as to cover the insert sheet 13 as the first sheet body and the end surface 16 of the insert sheet 13. The first resin portion 14 is laminated, and the second resin portion 15 is laminated on the other surface of the insert sheet 13. The backrest 12 is also configured in the same cross section as the seat 11. The chair 10 is an example of a resin molded product in which an insert sheet 13 is embedded and has a planar shape along the insert sheet 13. The chair 10 is a resin molded product in which the first sheet body is embedded. Next, with reference to (3) of FIG. 1, it is the cross section of the seat part 11 of the modification of the chair 10 shown in (1) and (2) of FIG. It is comprised so that the end surface 16 of the insert sheet 13 may be exposed. If comprised in this way, it will become a chair of the design which daredly exposed the end surface 16 of the insert sheet 13. In the present invention, the fact that the sheet is embedded in the resin molded product includes not only the state in which the insert sheet 13 is entirely embedded in the resin molded product as shown in FIG. As shown in (3), the state in which the end face 16 of the insert sheet 13 is exposed to the outside is also included.

Next, the injection mold 20 used for manufacturing the chair 10 will be described.

FIG. 2 is a diagram showing a schematic configuration of an injection mold according to the first embodiment of the present invention, in which (1) is a longitudinal end view of the cavity center, (2) FIG. 3 is a lateral end view of the cavity center cut.

Referring to FIGS. 2A and 2B, the injection mold 20 has a rectangular parallelepiped shape, and a cavity 30 is formed between the fixed mold 21 and the fixed mold 21 by clamping. In addition, a movable mold 22 and a slide mold 23 capable of moving forward and backward in the mold clamping direction are provided. In the state shown in (1) and (2) of FIG. 2, a cavity 30 corresponding to the outer shape of the chair 10 is formed. The insert sheet 13 is embedded in the cavity 30 at a position indicated by a two-dot chain line in the figure. In this injection mold 20, the fixed mold 21 constitutes a first mold, and the movable mold 22 constitutes a second mold.

The fixed die 21 has a side 22a of the movable die 22 inserted in substantially the center of the parting surface 24 and a recess that matches the shape of the chair 10. A first cavity surface 26 corresponding to a surface opposite to the seating surface and the backrest surface of the chair 10 is formed in the recess. A first gate 40 through which a first resin that forms the first resin portion 14 of the chair 10 is injected is set substantially at the center of the first cavity surface 26. The injection mold 20 employs a hot runner method, and the fixed mold 21 includes a first valve gate 40a connected to the first gate 40 and a first resin flow connected to the first valve gate 40a. A second valve gate 50a provided on the parting surface 24 near the lower side of the cavity 30, a second resin flow channel 51 connected to the second valve gate 50a, the first resin flow channel 41 and the first resin flow channel 41 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 movable mold 22 is formed with an opening 47 penetrating in the mold clamping direction in accordance with the shape of the chair 10 viewed from a predetermined direction substantially at the center. The inner surface is formed on the left and right sides of the opening 47 with the mold clamping direction as the front-rear direction. A side portion 22a having a substantially triangular plate shape protruding toward the fixed mold 21 side is provided. On the lower surface of the opening 47, a notch extending in a band shape in the mold clamping direction is formed from the front end to the rear end. The inner surface of the distal end portion of the side portion 22 a constitutes a third cavity surface 28 a corresponding to the left and right end surfaces of the chair 10. The upper side portion of the opening 47 on the fixed mold 21 side constitutes a third cavity surface 28 b corresponding to the upper end surface of the chair 10, and the lower side portion corresponds to the lower end surface of the chair 10. 28c is constituted.

The slide mold 23 has a columnar nesting portion 23a that protrudes from substantially the center of the surface of the fixed mold 21 and into which the opening 47 of the movable mold 22 is inserted. The outer shape of the nesting portion 23 a as viewed from the mold clamping direction is set to a shape such that the outer peripheral surface of the nesting portion 23 a slides on the inner peripheral surface of the opening 47. A band-like portion 49 extending in a band shape in the mold clamping direction is formed on the lower surface of the nesting portion 23a indicated by a broken line in (1) of FIG. The strip 49 slides in a notch formed in the lower surface of the opening 47. The distal end of the nesting portion 23 a is inserted into the concave portion of the fixed mold 21, and the distal end surface of the nesting portion 23 a constitutes a second cavity surface 27 corresponding to the seat surface and the backrest surface of the chair 10. Further, the upward leading end surface of the belt-like portion 49 constitutes the central portion of the third cavity surface 28c corresponding to the lower end surface of the chair 10.

The 2nd gate 50 in which the 2nd resin which forms the 2nd resin part 15 of the chair 10 is inject | poured is set to the front-end | tip of the strip | belt-shaped part 49, ie, the center of the 3rd cavity surface 28c. A connecting portion 51 a that is a part of the second resin flow path 51 that connects the second gate 50 and the second valve gate 50 a set in the fixed mold 21 is connected to the slide mold 23 from the parting surface 25 of the movable mold 22. It is formed over the surface. Accordingly, no resin flow path connected to the second gate 50 is formed behind the second cavity surface 27 of the slide mold 23, that is, inward from the second cavity surface 27. Therefore, the structure of the slide mold 23 is simplified, and the structure of the injection mold 20 can be simplified.

The fixed mold 21 and the slide mold 23 are fixed to each platen of an injection molding machine (not shown), and the movable mold 22 and the slide mold 23 are movable in the mold clamping direction while being guided by a tie bar (not shown) by a driving means (not shown). . The slide mold 23 is movable with respect to the movable mold 22 while the outer peripheral surface of the nest part 23 a slides on the inner peripheral surface of the opening 47. The movable mold 22 and the slide mold 23 move between predetermined positions by time control, and the first valve gate 40a and the second valve gate 50a are opened and closed by time control.

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 1 resin and 2nd resin are made to flow into fixed mold 21. The first resin is injected from the first gate 40 through the common resin flow channel 55 and the first resin flow channel 41 when the first valve gate 40a is opened. The second resin is injected from the second gate 50 through the common resin flow channel 55 and the second resin flow channel 51 when the second valve gate 50a is opened.

Next, a method for manufacturing the chair 10 using the injection mold 20 will be described.

FIG. 3 is a diagram showing a step of opening the mold and arranging the seat body among the manufacturing steps of the chair shown in FIG. 1, and FIG. 4 shows a step of forming the first resin portion by clamping the mold. FIG. 5 is a view showing a step of forming the second resin part by core back, and FIG. 6 is a view showing a step of opening the mold and taking out the molded chair.

Referring to FIG. 3, with the injection mold 20 opened, the insert sheet 13 is disposed at a predetermined position along the second cavity surface 27 of the insert portion 23a. If suction is performed from the back surface by a suction means (not shown), the insert sheet 13 can be effectively brought into close contact with the second cavity surface 27 and can be stably held on the slide mold 23. The positioning of the insert sheet 13 will be described later.

Next, referring to FIG. 4, the mold is clamped at a position where the slide mold 23 on which the insert sheet 13 is disposed is advanced, and the first cavity surface 26 is inserted between the insert sheet 13 and the first cavity surface 26 of the fixed mold 21. A partial cavity 42 is formed. A space formed outward from the peripheral edge of the insert sheet 13 is also included in the first partial cavity 42. At this time, the first valve gate 40a and the second valve gate 50a are in a closed state. Next, the first valve gate 40 a is opened, and the first resin is injected into the first partial cavity 42 via the first gate 40, thereby forming the first resin portion 14 of the chair 10. At this time, since the first gate 40 is set substantially at the center of the first cavity surface 26, the first resin injected from the first gate 40 flows from the center of the insert sheet 13 toward the periphery. Therefore, displacement and wrinkles of the insert sheet 13 due to the injection of the first resin can be prevented. After the first resin is completely filled in the first partial cavity 42, the first valve gate 40a is closed. The insert sheet 13 is fixed to the first resin portion 14 and the pressure is maintained until the first resin portion 14 has a predetermined hardness. This predetermined hardness is such a hardness that the first resin portion 14 is not deformed by the pressure of the second resin to be injected next.

Next, referring to FIG. 5, the slide mold 23, that is, the insert portion 23 a is retracted to a predetermined position, and the second partial cavity 52 is interposed between the insert sheet 13 and the second cavity surface 27 of the slide mold 23. Form. A space formed outward from the peripheral edge of the insert sheet 13 is also included in the second partial cavity 52. At this time, the second gate 50 and the second valve gate 50a communicate with each other through the connecting portion 51a. Next, the second valve gate 50 a is opened, and the second resin is injected into the second partial cavity 52 through the second gate 50, thereby forming the second resin portion 15 of the chair 10. Then, the insert sheet 13 is fixed to the second resin portion 15 and the pressure is maintained until the second resin portion 15 and the first resin portion 14 are integrated.

Next, referring to FIG. 6, the mold is opened and the chair 10 is taken out. Furthermore, the unnecessary gate member 57 by the connection part 51a is cut off. In this way, the insert sheet 13 is embedded, and the chair 10 having a planar spread along the insert sheet 13 is manufactured.

The positioning when the insert sheet 13 is disposed on the second cavity surface 27 of the slide mold 23 will be described.

FIG. 7 is a plan view showing the outer shape of the seat (1) used in the manufacture of the chair shown in FIG. 2, and (2) is a plane corresponding to (1) showing a modification. It is a figure, The (3) is the longitudinal cross-sectional view which showed the external shape of the sheet | seat which showed another modification.

Referring to (1) in FIG. 7, the insert sheet 13 is set so that the outer peripheral edge is inside the outer shape of the chair 10 indicated by a two-dot chain line over the entire circumference. Positioning is performed by aligning the upper and lower ends of the insert sheet 13 with the upper and lower ends of the second cavity surface 27 of the insert portion 23a while the center of the lower end of the insert sheet 13 is in contact with the third cavity surface 28c of the band-like portion 49. The insert sheet 13 is held in the nest part 23a.

Referring to (2) of FIG. 7, the insert sheet 13 is set so that the upper and lower ends are inside the outer shape of the chair 10, and both side ends are set to match the outer shape of the chair 10. And the collar part 59 is formed so that it may extend outside from the center of the both ends of the insert sheet 13, ie, the part corresponded in the bending part of the chair 10. As shown in FIG. The flange portion 59 is set to a size that protrudes from the cavity 30 and is sandwiched between the side portion 22a of the movable die 22 when the insert sheet 13 is placed on the insert portion 23a and clamped. . The movable die 22 is formed with a locking pin (not shown) that is inserted into the hole 48, the hole 48 is inserted into the locking pin, the insert sheet 13 is positioned, and the insert portion 13 a and the movable die 22 are inserted into the movable die 22. The sheet 13 is held. When the insert sheet 13 is held in this way, the first resin is injected from the first gate 40 in a state where the portion close to the first gate 40 is held. Since the first resin flows from the held portion toward the upper and lower ends of the insert sheet 13, it is possible to effectively prevent displacement and wrinkles of the insert sheet 13 due to the inflow of the first resin.

7 (3), the insert sheet 13 is molded in accordance with the shape of the second cavity surface 27 of the insert portion 23a. Specifically, the center portion of the insert sheet 13 is bent, and the upper and lower ends are further bent along the side surface of the insert portion 23a. In this way, if the insert sheet 13 is formed prior to placement in accordance with the portion where the insert sheet 13 is placed, that is, the shape of the insert portion 23a, the placement position of the insert sheet 13 becomes constant. It becomes easy to position. Moreover, since the bending part of the upper and lower ends of the insert sheet 13 pinches the nest | insert part 23a from upper and lower sides, the insert sheet 13 is hold | maintained effectively.

Next, the types of the insert sheet 13, the first resin, and the second resin will be described.

The insert sheet 13 is made of a resin sheet such as polyethylene terephthalate (PET), acrylic (PMMA), polycarbonate (PC), acrylonitrile / butadiene / styrene (ABS). A pattern layer may be formed on those resin sheets. The design layer is printed on the film by an offset printing method, a gravure printing method, a screen printing method or the like. The design layer is formed on the entire surface of the resin sheet or partially formed depending on the purpose of decoration. If a resin sheet made of the same type of resin as the first resin or the second resin is used, the insert sheet 13 is easily welded and fixed to the first resin portion or the second resin portion. 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 13 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.

As the first resin and the second resin, those having characteristics suitable for the resin molded product to be manufactured are used. For example, ABS, PMMA, polystyrene (PS), styrene acrylonitrile (AS), PC, polyvinyl chloride (PVC), PP, PET resin, foamable resin, and the like. By using a transparent or translucent resin for the first resin and the second resin, the insert sheet 13 itself and the pattern layer formed on the insert sheet 13 can be viewed 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 13 embed | buried in the resin molded product 10 from the exterior of the resin molded product 10 except transparent resin. If a resin sheet made of the same type of resin as the first resin or the second resin is used for the insert sheet 13, the first resin or the second resin and the resin sheet are welded and fixed at the time of molding the resin molded product. It can be made easy. When a foamable resin is used for the first resin or the second resin, for example, after filling the resin into the partial cavity, the molded article is expanded by moving the slide mold to expand the partial cavity. Can be manufactured.

From the above, in the manufacturing method of the chair 10 using the injection mold 20 configured as described above, the first resin portion 14 and the second resin are maintained while the insert sheet 13 is maintained in the shape of the second cavity surface 27. It is buried between the part 15. Therefore, it is possible to manufacture the chair 10 having a planar spread along the insert sheet 13 in which the insert sheet 13 having no rigidity is embedded while being maintained in a predetermined shape and position. If a transparent or translucent resin is used for the first resin and the second resin, the embedded insert sheet 13 is visualized from the outside of the chair 10. Therefore, the chair 10 of various designs can be manufactured by designing the insert sheet 13. Furthermore, if the insert sheet 13 that exhibits functions such as releasing and absorbing heat and blocking electromagnetic waves is embedded, the chair 10 having such functions can be manufactured. If the first resin and the second resin are the same resin, the first resin and the second resin are welded to each other and the adherability is improved, so that the quality of the chair 10 can be improved. If a plurality of holes are formed in the insert sheet 13, the first resin and the second resin are connected through the holes, and the contact area between the first resin and the second resin is increased. Can be improved.

[Second Embodiment]
FIG. 8 is a view showing a schematic configuration of an injection mold according to the second embodiment of the present invention, and is a longitudinal end view obtained by cutting the center of the cavity. It is a figure corresponding to (1) of FIG. 2 of previous 1st Embodiment. Since the basic configuration is the same as that of the injection mold 20 according to the first embodiment, different points will be described.

With reference to FIG. 8, in the injection mold 20 according to the first embodiment, the first resin flow path 41 and the second resin flow path 51 are branched from the common resin flow path 55. However, in the injection mold 70 according to the second embodiment, the first resin flow path 41 and the second resin flow path 51 are formed independently of each other. Two nozzles of an injection molding machine (not shown) are brought into contact with different nozzle touch portions 56 to cause the first resin and the second resin to flow into the fixed mold 21 from the different nozzles. The first resin is injected from the first gate 40 through the first resin flow path 41 when the first valve gate 40a is opened. The second resin is injected from the second gate 50 through the second resin flow path 51 when the second valve gate 50a is opened.

In the method of manufacturing the chair 10 using the injection mold 70 configured as described above, the first resin and the second resin can be made different from each other in the first resin and the second resin. The chair 10 having different physical properties and design from the part 15 can be manufactured. For example, if the first resin portion 14 is opaque and the second resin portion 15 is transparent, the chair 10 can be seen from which the insert sheet 13 can be seen only from the seating surface and the backrest side. If the resin for securing the shape retention of the chair 10 is used for the first resin part 14 and the resin having elasticity is used for the second resin part 15, the chair 10 can be made seated. it can.

[Third Embodiment]
FIG. 9 is a longitudinal sectional view of a resin molded product (1) manufactured using an injection mold according to the third embodiment of the present invention, and (2) is a third 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. 9, the resin molded product 60 includes a first resin portion 43 having a planar shape, and a second resin portion 53 having a planar shape that overlaps with a position shifted in the vertical direction. . In the upper part of the resin molded product 60, the first resin part 43 projects outward from the second resin part 53, and in the lower part of the resin molded product 60, the second resin part 53 projects outward from the first resin part 43. It is configured as follows. Between the 1st resin part 43 and the 2nd resin part 53, the insert sheet 32 which is a 1st sheet body is embed | buried, and the 2nd sheet body transcribe | transferred on the surface of the 1st resin part 43 simultaneously with injection molding. A transfer layer 34 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.

Referring to (2) of FIG. 9, the injection mold 20 includes a fixed mold 21, a movable mold 22 that forms a cavity 30 between the fixed mold 21 by mold clamping, and an interior of the fixed mold 21. And a slide mold 23 capable of moving forward and backward in the mold clamping direction. In the state of FIG. 9, as indicated 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 transfer layer 34 is formed is formed. The transfer sheet 33 on which the transfer layer 34 is formed at a predetermined interval is fed in the vertical direction so as to penetrate between the fixed mold 21 and the movable mold 22. In this injection mold 20, the movable mold 22 constitutes a first mold, and the fixed mold 21 constitutes a second mold.

The first cavity surface 26 corresponding to the surface on the one surface side of the insert sheet 32 in the resin molded product 60 is formed in the movable mold 22. The slide mold 23 is inserted substantially at the center of the parting surface 24 of the fixed mold 21. The slide mold 23 has a second cavity surface corresponding to a part of the other surface of the insert sheet 32 in the resin molded product 60. 27 is formed. Specifically, a second cavity surface 27 corresponding to a central portion excluding an upper portion and a lower portion of the surface on the other surface side of the insert sheet 32 in the resin molded product 60 is formed. In the fixed mold 21, a third cavity surface 28 connected to the first cavity surface 26 is formed around the second cavity surface 27. The third cavity surface 28 is a surface perpendicular to the parting surface 24 corresponding to the end surface of the resin molded product 60 including a surface parallel to the parting surface 24 positioned at the upper and lower portions of the slide mold 23 and a portion not shown. It consists of and. 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 fixed mold 21 includes a first gate 40 on the upper side and a second gate 50 on the lower side in a plane parallel to the parting surface 24 of the third cavity surface 28. From the 1st gate 40, the 1st resin which forms the 1st resin part 43 of the resin molded product 60 is inject | emitted. From the second gate 50, the second resin forming the second resin portion 53 of the resin molded product 60 is injected. The first resin and the second resin are molten resins. The fixed mold 21 includes a first resin flow path 41 connected to the first gate 40, a second resin flow path 51 connected to the second gate 50, a first resin flow path 41, and a first resin flow path. 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 first resin flow path 41 and the second resin flow path 51 are formed outside the slide mold 23 so as to surround three sides of the slide mold 23 in a side view. Recesses for accommodating the clamps 31 with a predetermined gap are formed above and below the cavity 30 of the parting surface 24. The injection mold 20 employs a hot runner valve gate system. 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 movable mold 22 has the first cavity surface 26 substantially at the center of the parting surface 25, and includes clamps 31 above and below the first cavity surface 26. The clamp 31 is configured to straddle the transfer sheet 33 in the width direction of the transfer sheet 33, and is movable in the mold clamping direction so as to contact and release the transfer sheet 33 from the parting surface 25.

The slide mold 23 is set to move forward and backward in the fixed mold 21 so as to constitute a predetermined forward position and a backward position.

The fixed die 21 and the movable die 22 are respectively fixed to a fixed plate and a movable plate of an injection molding machine (not shown), and the slide die 23 is slid on the inner peripheral wall of the fixed die 21 while the movable die 22 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 movable mold 22 and the slide mold 23 are moved between predetermined positions by a mold clamping device of the molding machine, and the first gate 40 and the second gate 50 are opened and closed by time control.

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 is injected from the first gate 40 through the common resin flow path 55 and the first resin flow path 41 when the first gate 40 is opened. The second resin is injected from the second gate 50 through the common resin flow path 55 and the second resin flow path 51 when the second gate 50 is opened.

Next, a method for manufacturing 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. 9, FIG. 10 is a diagram showing a step of opening the mold and arranging the first sheet body and the second sheet body. FIG. 11 is a diagram showing the process of forming the first partial cavity by clamping the mold (1), and (2) forming the first resin part by injecting the first resin into the first partial cavity. It is the figure which showed the process to do. FIG. 12 is a view in which the step (1) retreats the slide mold to form the second partial cavity, and (2) injects the second resin into the second partial cavity to place the second resin portion. It is the figure which showed the process of forming. FIG. 13 is a view showing a step of taking out a resin molded product formed by opening the mold.

Referring to FIG. 10, insert sheet 32 is arranged at a predetermined position along second cavity surface 27 of slide mold 23 in a state where mold 20 for injection molding is opened. The insert sheet 32 is positioned by, for example, providing a part protruding from the cavity 30 in the insert sheet 32, forming a hole in the protruding part, and forming a positioning fixing pin corresponding to the hole in the parting surface 24. This is done by fitting the hole to the positioning fixing pin. The position of the insert sheet 32 is fixed by a suction means (not shown). The transfer sheet 33 is fed into the mold along the parting surface 25 by a transfer sheet feeding device (not shown). The alignment of the transfer layer 34 is performed by detecting an alignment mark formed on the transfer sheet 33 by an alignment sensor (not shown). This alignment sensor is composed of, for example, a photoelectric sensor, and the alignment mark is detected when the signal light emitted from the projector is blocked by the alignment mark and the amount of light received by the light receiver changes. To do. The transfer sheet 33 is fed based on a signal from the alignment sensor so that the transfer layer 34 is disposed at a predetermined position. Next, the transfer sheet 33 is brought into contact with the parting surface 25 by moving the clamp 31 toward the parting surface 25 of the movable mold 22. Then, the transfer sheet 33 is arranged along the first cavity surface 26 by a suction means or the like (not shown). As a result, the transfer layer 34 is disposed at a predetermined position along the first cavity surface 26.

Next, referring to (1) of FIG. 11, the mold is clamped at a position where the slide mold 23 on which the insert sheet 32 is arranged is advanced, and the insert sheet 32 and the first cavity surface 26 of the movable mold 22 are fixed. A first partial cavity 42 is formed therebetween. In other words, the first partial cavity is formed between the insert sheet 32 and the transfer layer 34. A space formed outward from the peripheral edge of the insert sheet 32 is also included in the first partial cavity 42. At this time, the first gate 40 and the second gate 50 are in a closed state.

Next, referring to FIG. 11B, the first gate 40 is opened, and the first resin is injected into the first partial cavity 42 via the first gate 40, thereby forming 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 transfer layer 34 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. 12, after the insert sheet 32 is fixed to the first resin portion 43, the slide mold 23 is retracted to a predetermined position, and the insert sheet 32 and the slide mold 23 are A second partial cavity 52 is formed between the two cavity surfaces 27. 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. 12, the second gate 50 is opened, the second resin is injected into the second partial cavity 52 through the second gate 50, and the second resin portion 53 is formed. . 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. 13, the mold is opened and the resin molded product 60 is taken out. Thus, the resin molded product 60 in which the insert sheet 32 is embedded and the transfer layer 34 is formed on the surface simultaneously with the injection molding is manufactured.

Here, returning to (1) of FIG. 12, the first partial cavity 42 has a portion protruding upward by a predetermined size from the second partial cavity 52 when viewed from the mold clamping direction. In other words, the partial cavity located on the side opposite to the nozzle touch part 56 side with which the nozzle of the injection molding machine contacts is a predetermined size from the partial cavity located on the nozzle touch part 56 side when viewed from the mold clamping direction. It has a part protruding outward. The said predetermined magnitude | size is a magnitude | size which can set the valve gate connected to the resin flow path formed in the mold clamping direction.

When the sizes of the first partial cavity 42 and the second partial cavity 52 are configured as described above, a surface on the nozzle touch part 56 side having a predetermined size is formed in the first partial cavity 42. Therefore, the first gate 40 can be set on the surface, and the first resin flow path 41 connected to the first gate 40 can be set linearly in the mold clamping direction up to a predetermined length. It becomes easy to design. Furthermore, since the hot runner valve gate system is employed, unnecessary gate members other than the resin molded product 60 can be avoided.

For the insert sheet 32, a resin sheet of the same type as the insert sheet 13 of the first embodiment can be used. Moreover, the same kind of resin as the first resin and the second resin of the first embodiment can be used for the first resin and the second resin.

The transfer layer 34 is continuously formed at a predetermined interval on the transfer sheet 33 fed into the mold. Specifically, the transfer layer 34 is continuously formed on the base sheet at a predetermined interval. The transfer layer 34 includes an exfoliation layer that forms the outer surface of the resin molded product 60 and protects the design layer, a design layer on which the design and alignment marks are expressed, and adhesion between the first resin portion 43 and the transfer layer 34. There are an adhesive layer for improving the property, an anchor layer for protecting the pattern layer and improving the interlayer adhesion. Furthermore, when improving the peelability of the transfer layer 34 from the base sheet, a release layer is formed between the base sheet and the transfer layer 34.

The base sheet is made of a material such as a resin sheet such as PET, polypropylene (PP) or PMMA, a metal foil, glassine paper, coated paper, a cellulosic sheet such as cellophane.

For the release layer, a copolymer such as PMMA resin, polyester resin, vinyl chloride-vinyl acetate copolymer resin is used. In order to increase the hardness of the release layer and improve the scratch resistance of the resin molded product 57, an ultraviolet curable resin, an electron beam curable resin, or the like is used. The release layer is printed on the substrate sheet by a gravure printing method, a screen printing method, an offset printing method, or the like.

The design 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 release layer 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. The symbol layer is set entirely or partially depending on the symbol to be expressed.

A melamine-based resin or the like is used for the release layer, and a heat-sensitive or pressure-sensitive resin suitable for the material of the first resin and the second resin is used for the adhesive layer. If the first resin and the second resin are PMMA resins, the adhesive layer may be PMMA resin. 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. A thermosetting urethane resin or the like is used for the anchor layer. The release layer, the adhesive layer, and the anchor layer are 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.

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 second cavity surface 27. In addition to being embedded between the two resin portions 53, the transfer layer 34 is transferred to the surface and formed simultaneously with the injection molding. For this reason, an insert sheet 32 that is not rigid in itself is embedded while being maintained in a predetermined shape and position, and a transfer layer 34 is formed on the surface. A resin molded product can be manufactured. Furthermore, since the transfer layer 34 which is the second sheet body is transferred to the resin molded product 60 at the same time as the injection molding for each resin molded product 60 to be manufactured, the second sheet body is the same as the insert sheet 32. The arrangement of the second sheet body on the mold is more efficient than the case of the above.

Further, 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 transfer layer 34 are associated with each other in design, resin molded products 60 having various designs can be manufactured. In addition, since the insert sheet 32 and the transfer layer 34 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.

[Fourth Embodiment]
FIG. 14 is a longitudinal sectional view of a resin molded product (1) manufactured using an injection mold according to the fourth embodiment of the present invention, and (2) is the fourth of the present invention. It is the figure which showed schematic structure of the metal mold | die for injection molding by embodiment of this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center, and is a figure corresponding to FIG. 9 of previous 3rd Embodiment. FIG. 15 shows a step (1) of injecting the first resin into the first partial cavity to form the first resin portion in the manufacturing process of the resin molded product using the injection mold shown in FIG. It is a figure which shows a process, (2) is a figure which shows the process of injecting 2nd resin to a 2nd partial cavity, and forming a 2nd resin part, (2) of FIG. 11 of 3rd Embodiment And a diagram corresponding to (2) of FIG. Since the basic configuration is the same as that of the injection mold 20 according to the third embodiment, different points will be described.

Referring to (1) of FIG. 14, in the resin molded product 60 according to the third embodiment, the transfer layer 34 is formed as the second sheet body on the surface, but the resin molding according to the fourth embodiment is performed. In the product 71, an insert sheet 72 is formed on the surface as a second sheet body. The resin molded product 71 has a cross-sectional shape in which the resin molded product 60 is axisymmetric with respect to the parting line. Referring to (2) of FIG. 14, in the injection mold 20 according to the third embodiment, the slide mold 23 is configured to be capable of moving forward and backward in the mold clamping direction inside the fixed mold 21. In the injection mold 70 according to the fourth embodiment, the slide mold 23 is configured to be capable of moving forward and backward in the mold clamping direction inside the movable mold 22. Further, since the insert sheet 72 is used as the second sheet body, the transfer sheet 33 and the clamp 31 fed into the mold are eliminated. The insert sheet 72 is made of various materials like the insert sheet 32. In this injection mold 70, the fixed mold 21 constitutes a first mold, and the movable mold 22 constitutes a second mold.

The first cavity surface 26 corresponding to the surface on the one surface side of the insert sheet 32 in the resin molded product 71 is formed in the fixed mold 21. The slide mold 23 is inserted substantially at the center of the parting surface 25 of the movable mold 22, and the slide mold 23 has a second cavity surface corresponding to a part of the surface on the other surface side of the insert sheet 32 in the resin molded product 71. 27 is formed. Specifically, the 2nd cavity surface 27 corresponding to the center part except the upper part and lower part of the surface of the other surface side of the insert sheet 32 in the resin molded product 71 is formed. In the movable die 22, a third cavity surface 28 connected to the first cavity surface 26 is formed around the second cavity surface 27 in the same manner as in the third embodiment. The first gate 40 is set above the first cavity surface 26, and the second gate 50 is set below the first cavity surface 26.

In the method of manufacturing the resin molded product 71 using the injection mold 70, referring to FIG. 15 (1), the mold is clamped at the position where the slide mold 23 on which the insert sheet 32 is disposed is advanced. The first partial cavity 42 is formed between the insert sheet 32 and the first cavity surface 26 of the fixed mold 21. In other words, the first partial cavity 42 is formed between the insert sheet 32 and the insert sheet 72. As with the insert sheet 32, the insert sheet 72 is disposed at a predetermined position along the first cavity surface 26 of the fixed mold 21 with the injection mold 70 opened. Next, the first gate 40 is opened, and the first resin is injected from the first gate 40 into the first partial cavity 42 to form the first resin portion 43. Thereafter, after going through the same steps as in the third embodiment, referring to (2) in FIG. 15, after the insert sheet 32 is fixed to the first resin portion 43, the slide mold 23 is moved to a predetermined position. By retracting, a second partial cavity 52 is formed between the insert sheet 32 and the second cavity surface 27 of the slide mold 23. 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 third embodiment, the mold is opened and the resin molded product 71 is taken out. In this way, the resin molded product 71 in which the insert sheet 32 is embedded and the insert sheet 72 is formed on the surface is manufactured.

In the manufacturing method of the resin molded product 71 using the injection mold 70 configured as described above, since the slide mold 23 is not configured in the fixed mold 21, the first gate 40 and the first resin flow connected thereto. The degree of freedom in designing the path 41, the second gate 50, and the second resin flow path 51 connected thereto is expanded. In addition, since one is embedded and the other is configured such that two insert sheets overlap each other with a predetermined interval on the surface, a three-dimensionally designed resin molded product 71 can be manufactured.

[Fifth Embodiment]
FIG. 16 is a view showing a schematic configuration of an injection mold according to the fifth embodiment of the present invention, and is a longitudinal end view obtained by cutting the center of the cavity. It is a figure corresponding to (2) of Drawing 9 of a previous 3rd embodiment. Since the basic configuration is the same as that of the injection mold 20 according to the third embodiment, different points will be described.

Referring to FIG. 16, in the injection mold 20 according to the third embodiment, the first resin flow path 41 and the second resin flow path 51 are branched from the common resin flow path 55. However, in the injection mold 80 according to the fifth embodiment, the first resin flow path 41 and the second resin flow path 51 are formed independently of each other. Two nozzles of an injection molding machine (not shown) are brought into contact with different nozzle touch portions 56 to cause the first resin and the second resin to flow into the cavity 30 from the different nozzles. The first resin is injected from the first gate 40 through the first resin flow path 41 when the first gate 40 is opened. The second resin is injected from the second gate 50 through the second resin flow path 51 when the second gate 50 is opened.

In the method of manufacturing the resin molded product 60 using the injection mold 80 configured as described above, the first resin and the second resin can be different from each other. The resin molded product 60 having different physical properties and designs from the two resin portions 53 can be manufactured. For example, if the first resin portion 43 is opaque and the second resin portion 53 is transparent, the resin molded product 60 in which the insert sheet 32 can be seen only from one surface can be obtained. If the first resin part 43 is made of an elastic resin and the second resin part 53 is made of a resin for ensuring the shape-retaining property of the resin molded product 60, the resin has a devised surface feel. The molded product 60 can be obtained.

[Sixth Embodiment]
FIG. 17 is a longitudinal sectional view of a resin molded product in which (1) is manufactured using an injection mold according to the sixth embodiment of the present invention, and (2) is the sixth of the present invention. It is a figure which shows schematic structure of the metal mold | die for injection molding by embodiment of this, Comprising: It is the longitudinal end view which cut | disconnected the cavity center.

Referring to (1) of FIG. 17, the 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 FIG. 17 (1). 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. 17, the injection mold 20 includes a fixed mold 21 and a movable mold 22 that forms a cavity 30 between the mold 21 and the fixed mold 21. 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 first cavity surface 26 corresponding to the surface on one side of the insert sheet 32 in the resin molded product 60 is formed in the fixed mold 21. 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 to move forward and backward in the fixed mold 21 so as to constitute a predetermined forward position and a backward 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 29. 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.

Of the manufacturing steps of the resin molded product using the injection mold shown in FIG. 17, FIG. 18 is a diagram showing a step of opening the mold and arranging the first sheet body and the second sheet body. FIG. 19 is a diagram showing the process of forming the first partial cavity by clamping the mold (1), and (2) injecting the first resin into the first partial cavity to form the first resin part. It is the figure which showed the process to do. FIG. 20 is a diagram showing the step (1) of forming the second partial cavity by retreating the slide mold, and (2) injecting the second resin into the second partial cavity, It is the figure which showed the process of forming. FIG. 21 is a diagram showing a process of taking out a resin molded product molded by opening the mold.

Referring to FIG. 18, 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. 19, the mold is clamped at a position where the slide mold 23 on which the insert sheet 72 is disposed 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. 19, 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. 20, 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. The first resin portion 43 is held by the slide mold 23 by being sucked by a suction means or by being held at the tip of an ejector pin for releasing the resin molded product 60. Moreover, you may hold | maintain to the slide type | mold 23 by utilizing the adhesive force with respect to the slide type | mold 23 of the 1st resin part 43, or making the 1st resin part 43 the shape which comprises an undercut part. 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. 20, 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. 21, 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.

For the insert sheet 32 and the insert sheet 72, the same type of resin sheet as the insert sheet 13 of the first embodiment can be used. Moreover, the same kind of resin as the first resin and the second resin of the first embodiment can be used for the first resin and the second resin.

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. Further, 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.

[Seventh Embodiment]
FIG. 22 is a longitudinal cross-sectional view of a resin molded product manufactured using an injection mold according to the seventh embodiment of the present invention (1), and (2) is a seventh embodiment of the present invention. It is a figure which shows schematic structure of the injection die by this embodiment, Comprising: It is the longitudinal end view which cut | disconnected the cavity center, and is a figure corresponding to FIG. 17 of previous 6th Embodiment. FIG. 23 shows a step (1) of injecting the first resin into the first partial cavity to form the first resin portion 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 inject | pouring 2nd resin into a 2nd partial cavity, and forming a 2nd resin part, The figure of previous 6th Embodiment It is a figure corresponding to (2) of 19 and (2) of FIG. FIG. 24 is a diagram showing a step of taking out a resin molded product molded by opening the mold among the steps of manufacturing a resin molded product using the injection mold shown in FIG. FIG. 22 is a diagram corresponding to FIG. 21 of the embodiment. Since the basic configuration is the same as that of the injection mold 20 according to the sixth embodiment, the differences will be mainly described.

With reference to (1) of FIG. 22, in the resin molded product 60 according to the sixth embodiment, the first resin portion 43 and the second resin portion 53 are aligned and overlapped, but the seventh 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. 22, in the injection mold 20 according to the sixth embodiment, the movable mold 22 includes the outer peripheral mold 29 and the slide mold 23. However, according to the seventh 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 part 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 has 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 moves 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 manufacturing method of the resin molded article 81 using the injection mold 80, referring to FIG. 23 (1), 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 from the first gate into the first partial cavity 42 to form the first resin portion 43. Thereafter, after going through the same steps as in the sixth embodiment, referring to (2) of FIG. 23, the insert sheet 32 is fixed to the first resin portion 43 and then relative to the outer peripheral die 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 from the second gate 50 into the second partial cavity 52 to form the second resin portion 53. Thereafter, after the same steps as in the sixth 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 manufacturing method of the resin molded product 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 sixth 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, and 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 addition, in said 1st and 2nd embodiment, although the chair was demonstrated as a resin molded product, a sheet body is embed | buried under the resin molded product and it has the planar expansion along the sheet body. Other resin molded products may be used as long as the shape is included.

In the third to seventh embodiments, the second sheet body is formed on the surface of the resin molded product. However, if the first sheet body is embedded, the second sheet body is formed. It does not have to be.

In the third embodiment, the second sheet body is composed of a transfer layer. However, the second sheet body may be composed of an insert sheet. In the fourth to seventh embodiments, the second sheet body is composed of a second layer. The sheet body is composed of an insert sheet, but may be composed of a transfer layer transferred from a transfer sheet fed into the mold in the horizontal direction.

Further, in each of the embodiments described above, a non-rigid sheet body is used. However, a rigid sheet body may be used as long as it can be disposed along the first cavity surface or the second cavity surface. .

In the first and second embodiments described above, the mountain side of the chair is configured to be the first gate side, but the valley side of the chair may be configured to be the first gate side. The arrangement of the chair with respect to the injection mold may be reversed vertically or horizontally, and may be any direction rotated about the axis in the mold clamping direction.

Furthermore, in the first and second embodiments described above, the first gate is set substantially at the center of the first mold surface, but it is set at any position within the range of the first mold surface. Also good.

Furthermore, in the first and second embodiments described above, the second gate is formed on the third cavity surface. However, if the second resin is injected into the second partial cavity, the second gate is formed on the second cavity surface. May be.

Furthermore, in the first and second embodiments described above, the second gate is formed on the third cavity surface corresponding to the lower end surface of the chair, but it corresponds to the upper and left and right end surfaces of the chair. It may be formed on the third cavity surface.

Furthermore, in the first to fifth and seventh embodiments described above, one each of the first gate and the second gate is set, but a plurality of the first gate and the second gate may be set. Good.

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

Furthermore, in the first, second, and fifth to seventh embodiments, the hot runner method is adopted for the injection mold, but the resin is shifted from the first gate and the second gate. If it is injected, a cold runner method may be adopted.

Furthermore, in each of the above embodiments, a valve gate is adopted. However, if a resin molded product in which the first sheet body is embedded can be manufactured, another gate method such as a side gate is adopted.

Furthermore, in the second, fifth and seventh embodiments described above, different resins are used for the first resin and the second resin, but the same resin may be used.

Furthermore, in the first, third, fourth, and seventh embodiments, the first resin flow path and the second resin flow path are branched from the common resin flow path. As in the second and fifth embodiments, each of the first resin flow path and the second resin flow path may be formed independently.

An injection mold and a method for producing a resin molded product using the injection mold according to the present invention include interior parts, a part of a casing of an electronic device such as a mobile phone and a personal computer, and a casing of a household appliance. It can be widely used in the production of various resin molded products such as parts of automobile interior panels.

Claims

An injection mold that can be used to manufacture a resin molded product in which a first sheet body is embedded,
A first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body in the resin molded product is formed;
A second mold that forms a cavity with the first mold by clamping;
A slide mold in which a second cavity surface corresponding to a surface on the other side of the first sheet body in the resin molded product can be moved forward and backward in the mold clamping direction in the second mold;
The first sheet body is disposed along the second cavity surface, and is formed between the first sheet body and the first cavity surface at a position where the slide mold is advanced in a clamped state. A first gate into which a first resin is injected so as to form a first resin portion in the partial cavity;
After the first sheet body is fixed to the first resin portion, the slide mold is retracted, and a second position is formed between the first sheet body and the second cavity surface at a position where the slide mold is retracted. An injection mold having a partial cavity and a second gate into which a second resin is injected so as to form a second resin portion in the second partial cavity.
The injection mold according to claim 1, wherein the first gate is set substantially at the center of the first cavity surface.
The third cavity surface corresponding to the end surface of the resin molded product is formed in at least one of the second mold and the slide mold, and the second gate is set to the third cavity surface. 3. An injection mold according to claim 1 or claim 2.
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 first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body in the resin molded product is formed;
A second mold that forms a cavity with the first mold by clamping;
A slide mold in which a second cavity surface corresponding to at least a part of the other surface of the first sheet body in the resin molded product can be moved forward and backward in the mold clamping direction in the second mold;
The second sheet body is disposed along the first cavity surface, the first sheet body is disposed along the second cavity surface, and the first mold body is positioned at a position where the slide mold has advanced in a 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 sheet body and the second sheet body;
After the first sheet body is fixed to the first resin portion, the slide mold is retracted, and a second position is formed between the first sheet body and the second cavity surface at a position where the slide mold is retracted. An injection mold having a partial cavity and a second gate into which a second resin is injected so as to form a second resin portion in the second partial cavity.
5. The injection molding according to claim 4, wherein the second sheet body is a transfer layer that is formed at predetermined intervals on a transfer sheet that is fed into the mold and is sequentially disposed at predetermined positions in the mold. Mold.
Of the first partial cavity and the second partial cavity, the partial cavity located on the side opposite to the nozzle touch part side where the nozzle of the injection molding machine contacts is located on the nozzle touch part side when viewed from the mold clamping direction. The injection mold according to any one of claims 1, 4, and 5, further comprising a portion protruding outward from the partial cavity by a predetermined size.
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 first mold in which a first cavity surface corresponding to a surface on one side of the first sheet body in the resin molded product is formed;
A second mold that forms a cavity with the first mold by clamping;
The first mold or the second mold can move forward and backward in the mold clamping direction relative to the outer peripheral mold and the outer peripheral mold in the outer peripheral mold, and the first sheet body in the resin molded product A slide mold on which a second cavity surface corresponding to the other 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 first mold body is moved forward in the mold clamping 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 sheet body and the second sheet body;
After the first sheet body is fixed to the first resin part, the slide mold is retracted while holding the first resin part, and the first sheet body is in a position where the slide mold is retracted. An injection molding comprising a second partial cavity formed between the first cavity surface and a second gate into which the second resin is injected so as to form a second resin portion in the second partial cavity. Mold.
The injection mold according to claim 7, wherein the first resin and the second resin are the same resin, and the first gate and the second gate are the same gate.
A method for producing a resin molded product in which the first sheet body is embedded, using the injection mold according to any one of claims 1 to 3.
Placing the sheet along the second cavity surface with the mold open;
Clamping the mold at a position where the slide mold on which the first sheet body is disposed is advanced to form the first partial cavity;
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 to the formed first resin portion;
Forming the second partial cavity by retracting the slide mold after the first sheet body is fixed to the first resin portion;
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.
A method for producing a resin molded product using the injection molding die according to claim 4 or 5, wherein the first sheet body is embedded, and the second sheet body is formed on the surface simultaneously with the injection molding,
Disposing the second sheet body along the first cavity surface in a state where the mold is opened, and disposing the first sheet body along the second cavity surface;
Clamping the mold at a position where the slide mold on which the first sheet body is disposed is advanced to form the first partial cavity;
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;
Forming the second partial cavity by retracting the slide mold after the first sheet body is fixed to the first resin portion;
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.
A method for producing a resin molded product using the injection mold according to claim 7 or claim 8, 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 in which the second sheet body is disposed at a position advanced;
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;
A step of forming the second partial cavity by retreating the slide mold while holding the first resin portion after the first sheet body is fixed to the first resin portion;
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 any one of claims 9 to 11, wherein at least one of the first resin and the second resin is transparent or translucent.
The method for producing a resin molded product according to any one of claims 9 to 12, wherein the first resin and the second resin are the same resin.