JP6710378B2 - Molding method and mold - Google Patents

Description

The present invention, for example, the heated and molten material about the molding method and the mold to produce a molded article by injecting injected into the mold.

Conventionally, when a synthetic resin molded product is manufactured, an injection molding method is generally used. In recent years, various methods have been developed as an injection molding method in which different resin materials are combined and integrated.

For example, Patent Document 1 discloses a die slide method. According to this, one mold is provided with a male mold and a female mold for molding a divided body obtained by dividing a hollow molded product into two parts, and the other mold has a female mold facing the male mold and the female mold. Using a set of dies provided with a male mold, each mold is injection-molded by the mold at the same time, and then one mold is slid so that the divided parts left in each female face each other. Then, by matching the respective molds, the divided bodies are made to abut against each other. Then, a molten resin is injected to the periphery of the abutting surface so that the divided bodies are welded to each other.

However, in this method, it is necessary to provide two sets (a plurality) of male molds and two female molds, and it is necessary to switch and use a combination thereof, which is complicated.

JP-A-62-87315

The present invention, in view of the above problems, and an object thereof is to provide a simple molding method and the mold to integrate a combination of different resin materials.

According to the present invention, a first material is provided in a first gap between the first mold member and the second mold member at a first position where the first mold member and the second mold member are close to or in contact with each other. And a second molding step of molding a first molded body by injecting the resin and positioning the relative distance between the first mold member and the second mold member longer than the relative distance at the first position. And the second position after the position changing step, the second material is injected into the second gap between the first mold member and the second mold member to form the second molded body. And a second molding step, wherein the first mold member and the second mold member are in contact with each other at the first position, and a closed region where the first material is not injected is provided. The step is configured to inject the first material into the first gap formed outside the closed area, and the second molding step is performed inside the closed area at the second position. In the configuration in which the second material is injected into the second gap between the first mold member and the second mold member, the first mold member and the second mold member have the first The bank forming gap portion longer than the difference in the relative distance between the position and the second position is provided so as to continuously surround the outside of the closed region in the first gap, and the first forming step includes The first material is injected into the first gap including the bank forming gap, and the second forming step is surrounded by the bank formed by the first material injected into the bank forming gap. configuration and is molding method of injecting the second material into the second gap, and, characterized in that it is a die used to this.

This invention can provide a simple molding method and the mold to integrate a combination of different resin materials.

The perspective view of a container (wet tissue case). FIG. 3 is an exploded perspective view of a container including the container main body in an open state. AA sectional view of a container main part. Explanatory drawing explaining an injection molding apparatus. Explanatory drawing explaining each process which shape|molds a container main-body part. The flowchart which shows operation|movement of an injection molding apparatus.

An embodiment of the present invention will be described below with reference to the drawings and the like.

<Container (wet tissue case) structure>
FIG. 1 is a perspective view of a container 1 (wet tissue case).
FIG. 2 is an exploded perspective view of the container 1 including the container main body 2 in the opened state.

The container 1 is made up of three parts, namely, a container body 2, a lid portion 3, and a lid opening/closing button portion 4.
The lid body 3 has a substantially rectangular shape, and is connected to the container body 2 via a hinge portion 31 that covers a part of the upper surface of the container body 2 and is provided at the rear portion.

The lid opening/closing button portion 4 has a substantially arcuate shape and is provided on the front portion of the upper surface of the container body 2, and is arranged so that the arcuate portion 4a side is the front and the chord portion 4b side is the rear. The string portion 4b of the lid opening/closing button portion 4 faces the front end portion 3a of the lid portion 3 when the lid portion 3 is closed. The lid opening/closing button portion 4 is provided with a lock receiving portion 41 for locking the locking protrusion 32 provided on the front end portion 3a of the lid portion 3 on the string portion 4b.
Both the lid 3 and the lid opening/closing button 4 are made of a synthetic resin plastic material such as polypropylene (PP).

<Structure of container body>
FIG. 3 is a sectional view taken along the line AA of the container body 2 shown in FIG.
The container body 2 has a rectangular parallelepiped accommodating portion 21 having an opening at the top and a shallow depth, and a rectangular parallelepiped cover portion having a lower opening having the same opening as the accommodating portion 21 at the bottom. 22 and 22. A part of the lower rear portion of the cover portion 22 is connected to a part of the upper rear portion of the housing portion 21 via the connecting portion 20. The connecting portion 20 is bendably connected to the cover portion 22 or the housing portion 21. As a result, the cover portion 22 can be moved in the front-rear direction about the connecting portion 20 as a rotation axis, and the housing portion 21 can be opened and closed.

The container body 2 is integrally formed with the housing 21, the cover 22, and the connecting portion 20, and is made of a synthetic resin plastic material such as polypropylene (PP).

The cover portion 22 is provided with a groove portion 22a that opens downward at the lower end portions of the front surface portion and the left and right side surface portions. The accommodating portion 21 is provided with a protruding portion 21 a protruding upward at the upper end portion of the entire peripheral surface portion. When the housing portion 21 is covered with the cover portion 22 from above, the protruding portion 21a of the housing portion 21 is fitted into the groove portion 22a of the cover portion 22. As a result, the cover portion 22 that covers the housing portion 21 does not move back and forth and left and right in that state.

The cover 22 is provided with a locking portion 22b at the lower front surface. The housing portion 21 is provided with a lock receiving portion 21b on the upper front surface thereof for engaging and disengaging the lock portion 22b of the cover portion 22. By locking the locking portion 22b of the cover portion 22 that covers the housing portion 21 to the locking receiving portion 21b of the housing portion 21, the cover portion 22 is prevented from unintentionally opening in the vertical direction.

The cover 22 is provided with a substantially rectangular opening 22c at the center of the upper surface. An elastic sheet 23 that covers the peripheral edge portion 23a and has a take-out opening portion 23b in the center is provided in the substantially rectangular opening portion 22c of the cover portion 22.

The elastic sheet 23 is transparent or translucent, and is made of a synthetic resin elastomer material. The elastic sheet 23 has an outer shape larger than the substantially rectangular opening 22c of the cover portion 22, and an outer edge portion thereof is heat-sealed to the back surface side of the cover portion 22. The extraction opening portion 23b has a shape in which an elliptical opening surrounded by a peripheral edge portion 23a is narrowed by protruding the peripheral edge portion 23a in an arc shape from the three directions of the periphery toward the center. The arc-shaped overhanging portion 23c, which projects in an arc shape, is slightly curved upward in the center.

Since the elastic sheet 23 is transparent or semi-transparent, it is easy to grasp the presence or absence of the one (wet tissue) contained in the container 21 of the container body 2. The elastic sheet 23 has arcuate protrusions 23c that extend in an arc shape from three directions toward the center of the extraction opening 23b. Therefore, the wet tissue that is about to be pulled out upward from the take-out opening portion 23b is easily located at the center of the take-out opening portion 23b, and the wet tissue can always be pulled out at the same position. The arcuate overhanging portion 23c has no angular portion on the outer circumference. Therefore, when pulling out the wet tissue, there is little risk that it will be caught by the arcuate overhanging portion 23c and tear. The arcuate overhanging portion 23c is slightly curved upward in the center. Therefore, when pulling out the wet tissue, the wet tissue is easily guided to the extraction opening 23b.

The elastic sheet 23 is made of an elastomer material of synthetic resin. Therefore, when the wet tissue is pulled out, the arcuate overhanging portion 23c of the elastic sheet 23 can be deformed corresponding to the direction even if the wet tissue is pulled out obliquely upward, and the degree of freedom in the direction of pulling out the wet tissue is increased. Increase. In addition, the arcuate overhanging portion 23c of the elastic sheet 23 deformed corresponding to the pull-out direction tends to return to its original shape after the wet tissue is pulled out. Therefore, the subsequent wet tissue that contacts the arcuate overhanging portion 23c is less likely to be pulled out following the preceding wet tissue.

The cover portion 22 is provided with a holding leaf spring 24 at the rear portion of the upper surface of which the end portion 24b pushes the lid portion 3 upward.

The holding leaf spring 24 is a substantially rectangular plate-like body that protrudes upward from the opening 22d at the rear of the upper surface of the cover portion 22, and is arranged so that the plate-like body surface is parallel to the left-right direction (see FIG. 1). ). The holding leaf spring 24 has a leaf spring portion 24a that protrudes upward from the opening portion 22d and then extends while curving diagonally forward, and an end portion 24b that is connected to the leaf spring portion 24a and bends toward the front horizontal direction. ing. The holding leaf spring 24 is thicker on the side of the opening 22d and gradually thinner toward the side of the end 24b. The pressing leaf spring 24 is formed of a synthetic resin elastomer material. Further, the holding leaf spring 24 is connected to the holding leaf spring base 24c which is also made of the synthetic resin elastomer material and is heat-sealed around the opening 22d of the cover portion 22 (see FIG. 2).

The leaf spring portion 24a and the end portion 24b of the holding leaf spring 24 are made of a synthetic resin elastomer material. Therefore, the lid body portion 3 can be pushed upward by the elastic force of the pressing leaf spring 24 and pushed open. Further, when the lid body portion 3 is closed, the holding plate spring 24 falls forward and is housed in the gap between the lid body portion 3 and the upper surface of the cover portion 22.

The cover portion 22 is provided with a button base portion 25 for attaching the lid opening/closing button portion 4 to the front portion of the upper surface.
The button base portion 25 has a substantially arc shape that is one size smaller than the lid opening/closing button portion 4 having a substantially arc shape. The lid opening/closing button portion 4 is installed so that the string portion 4b overlaps the string portion 25b of the button base portion 25 so that the button base portion 25 is covered from above.

In the cover portion 22, an elongated gap 22e is formed between the upper front surface and the circular arc portion 25a of the button base 25 along the circular arc portion 25a. A fixing leaf spring 26 that connects the circular arc portion 25a of the button base portion 25 to the upper portion of the front surface of the cover portion 22 is provided in the gap 22e of the cover portion 22.

The fixing leaf spring 26 has a substantially U-shaped cross section and is arranged along the gap 22e. The fixing leaf spring 26 is made of an elastomer material of synthetic resin and is connected to the cover portion 22 by heat fusion.

As a result, when the lid opening/closing button portion 4 is pressed from above, the button base portion 25 supporting the lid opening/closing button portion 4 is pushed down on the side of the arc portion 25a connected to the fixing leaf spring 26 having elastic force. .. As a result, the lid opening/closing button portion 4 is pushed down on the arc portion 4a side, and as a result, the chord portion 4b of the lid opening/closing button portion 4 on the opposite side is dragged forward. As a result, the engagement between the engagement receiving portion 41 provided on the string portion 4b of the lid opening/closing button portion 4 and the engagement protrusion 32 provided at the front end portion 3a of the lid portion 3 is released, The lid part 3 is opened (see FIG. 1).

The housing 21 is provided with substantially rectangular openings 21c at the four corners of the bottom. In the substantially rectangular opening 21c at the bottom of the accommodating portion 21, leg portions 27 having a truncated pyramid shape protruding downward are provided.

The leg portion 27 is made of a synthetic resin elastomer material. Further, the leg portion 27 is connected to the leg portion base 27a which is also made of an elastomer material of synthetic resin and is heat-sealed around the opening portion 21c at the bottom of the housing portion 21. Since the leg portion 27 is made of a synthetic resin elastomer material, it functions as a slip stopper when it is placed on a table or the like.

The elastic sheet 23, the pressing leaf spring 24, the fixing leaf spring 26, and the leg portion 27 may be formed of the same elastomer material, and an elastomer material of a type suitable for each may be selected. Good.

<Injection molding machine>
FIG. 4 is an explanatory diagram illustrating the injection molding device 50.
The injection molding device 50 includes a moving unit 51, an injection unit 52, a spacer insertion unit 56, and a control device 53 that controls the operations of the moving unit 51, the injection unit 52, and the spacer insertion unit 56.

The moving unit 51 is a drive that attaches a first mold member 61 and a second mold member 62 that form the mold 60, and changes the relative distance between the first mold member 61 and the second mold member 62. It has a mechanism 51a. A toggle system or a direct pressure system can be used for the drive mechanism 51a. Here, the relative distance between the first mold member 61 and the second mold member 62 is changed by fixing the first mold member 61 and moving the second mold member 62 using the drive mechanism 51a. I am letting you.

The second mold member 62 incorporates an eject pin 51b for pushing out the completed molded product from the second mold member 62 and removing it. The eject pin 51b is pushed out by the drive mechanism 51a of the moving unit 51.

In this example, the injection unit 52 includes two units, a first injection unit 54 and a second injection unit 55. The injection unit 52 has an injection mechanism for injecting the melted material into the gap 60 a between the first mold member 61 and the second mold member 62. There are various injection mechanisms, but in this example, a screw type is used. Materials to be injected include synthetic resin plastic materials and elastomer materials. In this example, the first injection unit 54 injects a plastic material as the first material, and the second injection unit 55 injects an elastomer material as the second material.

The first injection unit 54 and the second injection unit 55 are provided with hoppers 54a and 55a for receiving materials (first material and second material), and heaters 54b and 55b on the outer periphery, and are charged from the hoppers 54a and 55a inside. Cylindrical cylinders 54c and 55c for heating and melting the melted material, screws 54d and 55d for inserting the melted material into the cylinders 54c and 55c to perform a rotating operation and a back-and-forth operation, and to inject the melted material. , 55d are provided with motors 54e, 55e for performing a rotating operation and a back-and-forth operation.

The first mold member 61 has a first sprue 61a and a second sprue for respectively injecting the melted first material or second material into the gap 60a between the first mold member 61 and the second mold member 62. 61b is provided. The first sprue 61a is connected to the injection port 54f at the tip of the cylinder 54c of the first injection unit 54, and the second sprue 61b is connected to the injection port 55f at the end of the cylinder 55c of the second injection unit 55.

The spacer insertion unit 56 includes a spacer member 56b sandwiched between a first mold member 61 and a second mold member 62, and a spacer member 56b between the first mold member 61 and the second mold member 62. It has a spacer drive mechanism 56a that is inserted into or pulled out of. The spacer member 56b is sandwiched by the outer peripheral portion where the first mold member 61 and the second mold member 62 are adjacent to each other. The thickness of the spacer member 56b in the direction that changes the relative distance between the first mold member 61 and the second mold member 62 is t. An air cylinder is used for the spacer drive mechanism 56a.

The control device 53 is a computer, and includes a control unit including a CPU and a memory (ROM, RAM, etc.), an output display unit such as a liquid crystal display, an input operation unit (keyboard, mouse, etc.), a hard disk and a non-volatile memory. A storage unit configured by a memory or the like, a medium processing unit that reads data or a program from a storage medium 53a such as a CD-R, a moving unit 51 and an ejection unit 52 (first ejection unit 54 and an ejection unit 54) via an I/O cable. The second injection unit 55) and the spacer insertion unit 56 are provided with an I/O interface section that inputs and outputs data and signals. In the control device 53, the injection molding device control program stored in the storage medium 53a is installed in the storage unit. According to this injection molding device control program, the control unit of the control device 53 controls the movement operation of the movement unit 51, the injection operations of the first injection unit 54 and the second injection unit 55, and the spacer member of the spacer insertion unit 56. The control of the insertion/removal operation of 56b is executed.

<Container molding method>
FIG. 5 is an explanatory diagram illustrating each step of molding the container body 2 using a part of the AA cross section of the container body 2 shown in FIG.

FIG. 6 is a flowchart showing the operation of the injection molding device 50.
Hereinafter, as an example, a method of molding the container main body 2 which is a main component of the container 1 using the above-described injection molding device 50 will be described.

<<Molding method for container body>>
The control unit of the control device 53 transmits a forward movement signal to the moving unit 51 and moves the second mold member 62 to the first position where the first mold member 61 and the second mold member 62 are close to or in contact with each other. (Clamping: Step S1).

It should be noted that the first mold member 61 is provided with a recess 61 c that opens toward the gap (first gap 60 a) between the first mold member 61 and the second mold member 62. The concave portion 61c has a boundary wall surface portion 61d having a length L in a direction substantially parallel to the direction in which the relative distance between the first mold member 61 and the second mold member 62 is changed and in the direction in which the relative distance is changed. (See FIG. 5A). The concave portion 61c is formed so as to continuously surround the outside of the region (closed region) forming the second gap 60b for one round.

The control unit sends an injection holding pressure signal to the first injection unit 54 to inject the molten first material of the thermoplastic material. The first material injected from the first injection unit 54 passes through the first sprue 61a of the first mold member 61 and is injected into the first gap 60a. When the first member injected into the first gap 60a is filled in the first gap 60a, the control unit applies an injection pressure to the first injection unit 54 so as to apply and maintain a predetermined pressure to the first member ( The holding pressure is controlled (first injection, holding pressure: step S2).

The control unit causes the first injection unit 54 to maintain a state in which the injection pressure (holding pressure) is controlled for a predetermined time (cooling: step S3). Meanwhile, the melted first member filled in the first gap 60a is cooled and solidified by the cooling water flowing inside the first mold member 61 and the second mold member 62 to mold the first molded body. To do. In this way, as the first molded body, the housing portion 21 and the connecting portion 20 as well as the cover portion 22 of the container body portion 2 are molded (see FIGS. 2 and 3).

In addition, the convex portion 22f (bank) corresponding to the concave portion 61c (bank forming gap portion) of the first mold member 61 is also formed in the first molded body (the cover portion 22 of the container body portion 2). Then, the convex portion 22f is substantially parallel to the direction of changing the relative distance between the first mold member 61 and the second mold member 62, which is common to the boundary wall surface portion 61d of the concave portion 61c, and the relative distance is changed. A boundary wall surface portion 22g having a length L in the direction of is formed (see FIG. 5B).

The control unit transmits an intermediate mold opening signal to the moving unit 51, and the relative distance between the first mold member 61 and the second mold member 62 becomes the relative distance at the first position to the thickness of the spacer member 56b. The second mold member 62 is moved so that the second mold member 62 is positioned at an intermediate mold opening position that is longer than the distance obtained by adding the distance t (the intermediate mold opening: step S4a).

Here, the thickness t of the spacer member 56b is set to 0.8 to 1.2 mm, and the relative distance between the first mold member 61 and the second mold member 62 at the halfway mold open position. The distance is set to be 1.5 to 2.0 mm longer than the relative distance at the first position. The relative distance at this mold opening position can be set arbitrarily, and can be set to 0.9 mm to 4.2 mm, preferably 1.3 mm to 3.2 mm, and 1.6 mm to It is more preferably 2.7 mm, and preferably 1.8 mm to 2.2 mm.

The controller sends a spacer insertion signal to the spacer insertion unit 56 to insert the spacer member 56b between the first mold member 61 and the second mold member 62 (spacer insertion: step S4b).

The control unit transmits an intermediate position mold closing signal to the moving unit 51, and sandwiches the spacer member 56b inserted between the first mold member 61 and the second mold member 62 so as to sandwich the second mold member. 62 is moved to the second position (mid-position mold closing: step S4c).

In this way, the second mold member 62 becomes the first mold member 61 by performing the steps of the intermediate mold opening (step S4a), the spacer insertion (step S4b) and the intermediate position mold closing (step S4c). Is positioned at a second position where the relative distance between the second mold member 62 and the second mold member 62 is longer than the relative distance at the first position by a distance difference d. The distance difference d at this time is set equal to the thickness t of the spacer member 56b. At that time, the first compact moves along with the second mold member 62, and the contact state between the first compact and the second mold member 62 is maintained (position change: step S4 (S4a- S4c)). The relative distance between the first mold member 61 and the second mold member 62 at the first position and the difference between the first mold member 61 and the second mold member 62 at the second position are set arbitrarily. It is possible to set it to 0.1 mm to 3 mm, preferably 0.5 mm to 2 mm, more preferably 0.8 mm to 1.5 mm, and more preferably about 1 mm. Is preferred.

Here, the length L of the boundary wall surface portion 22g of the convex portion 22f of the first molded body (the length in the separating movement direction of the first mold member 61 and the second mold member 62, that is, the thickness direction of the first molded body) Length) is set to be longer than the distance difference d. For this reason, the outer periphery of the gap (second gap 60b) formed between the first mold member 61 and the second mold member 62 at the second position is the boundary wall surface of the convex portion 22f of the first molded body. The part 22g continuously partitions one round (see FIG. 5C).

The control unit of the control device 53 transmits an injection pressure holding signal to the second injection unit 55 to inject the molten second material of the thermoplastic elastomer material. The second material injected from the second injection unit 55 passes through the second sprue 61b of the first mold member 61, and the boundary wall surface of the convex portion 22f of the first molded body (the cover portion 22 of the container body portion 2). It is injected into the second gap 60b partitioned by the portion 22g. When the second member injected into the second gap 60b is filled into the second gap 60a, the control unit applies an injection pressure to the second injection unit 55 so as to apply and maintain a predetermined pressure on the second member ( The holding pressure is controlled (second injection, holding pressure: step S5). At the time of this second injection, since the outer periphery of the second gap 60b is continuously surrounded by the convex portion 22f (bank), the second material does not flow out of the convex portion 22f (bank), The second material can be poured only inside the convex portion 22f (bank). In this way, since the convex portion 22f (bank) is formed during the first injection, the flow of the material during the second injection is restricted, and the range of the flow of the second material changes from that of the first material, The first molded body of the first material and the second molded body of the second material can have different shapes, not simply the molded body in which two materials are doubly overlapped.

The control unit causes the second injection unit 55 to maintain a state in which the injection pressure (holding pressure) is controlled for a predetermined time (cooling: step S6). Meanwhile, the melted second member filled in the second gap 60a is cooled and solidified by the cooling water flowing inside the first mold member 61 and the second mold member 62 to mold the second molded body. To do. At the same time, the second molded body is heat-sealed at the portion in contact with the first molded body. In this way, the elastic sheet 23, the pressing leaf spring 24, the fixing leaf spring 26, and the leg portion 27 are molded as the second molded body (see FIGS. 2, 3, and 5D).

The control unit sends a retreat signal to the moving unit 51, retracts the second mold member 62 to the open position, and opens the mold 60 (mold opening: step S7). At that time, the molded product composed of the first molded body and the second molded body moves together with the second mold member 62.

The control unit transmits an ejector advance signal to the moving unit 51, advances the eject pin 51b incorporated in the second mold member 62, and removes the molded product from the second mold member 62 (ejector advance: step S8). ).

At this time, the control unit sends a spacer removal signal to the spacer insertion unit 56 to remove the spacer member 56b between the first mold member 61 and the second mold member 62.

The molded product removed from the second mold member 62 is taken out from the injection molding device 50 (molded product takeout: step S9).
After that, the control unit transmits an ejector retreat signal to the moving unit 51, stores the eject pin 51b in the second mold member 62, and finishes (ejector retreat: step S10).

The first mold member 61 may be provided with a convex portion that projects into the gap (first gap 60a) between the first mold member 61 and the second mold member 62. In this case, the convex portion is a boundary wall surface portion that is substantially parallel to the direction that changes the relative distance between the first mold member 61 and the second mold member 62 and has a length L in the direction that changes the relative distance. To have. Here, the length L of the boundary wall surface portion of the convex portion of the first mold member 61 is set to be longer than the distance difference d. By doing so, the gap (second gap 60b) formed between the first mold member 61 and the second mold member 62 at the second position is defined by the boundary of the convex portion of the first mold member 61. It can be partitioned by the wall surface portion (position change: step S4).

≪Molding method of lid and lid opening/closing button≫
Further, the lid body portion 3 and the lid body open/close button portion 4, which are components other than the container body portion 2 of the container 1, can also be molded using the injection molding device 50 described above. When molding these, in the flowchart (see FIG. 6) showing the operation of the injection molding apparatus 50 described above, (position change: step S4), (second injection, pressure holding: step S5) and (cooling) : Each step of step S6) can be omitted.

With the above configuration and operation, the above-described container molding method is performed by the first mold member 61 and the second mold at the first position where the first mold member 61 and the second mold member 62 are brought close to or brought into contact with each other. Between the first mold member 61 and the second mold member 62, the first molding step of molding the first molded body by injecting the first material of the plastic material into the first gap 60a between the member 62 and And a second gap between the first mold member 61 and the second mold member at the second position after the position changing process. A second molding step of molding a second molded body by injecting a second material of an elastomer material into 60b. Therefore, the container body 2 made of the plastic material and the elastomer material can be easily molded in a short time.

That is, despite the use of the first material and the second material, the first formed body is molded with the first material and removed from the first set of molds as in the conventional case, and the second set of molds is then removed. Even if a plurality of steps such as setting the second molded body and pouring the second material into the mold are not performed, only one set of molds (the first mold member 61 and the second mold member 62) can be used to set this set of molds. The formation of the first formed body of the first material and the subsequent formation of the second formed body of the second material can be continuously performed until the molded body is removed from the mold.

Further, the two-layer structure of the first material and the second material as shown by M in FIG. 3 can be easily manufactured. In addition, the second operation of (position change: step S4), (second injection, pressure holding: step S5) and (cooling: step S6) is performed as a subroutine, and the second injection, pressure holding: step S5 is performed. By changing the type of material, it is possible to easily manufacture a multilayer structure composed of a plurality of types of materials.

In the second molding step, the first material is injected into the second gap 60b between the first mold member 61 and the second mold member at the second position after the position changing step to form the second molded body. It can also be molded. By doing so, it is possible to easily produce a two-layer or multi-layer laminate made of the same type of material. The laminate thus produced has a small internal stress and is less likely to change its shape with time after completion.

In the above-described molding method, the closed region where the first material of the plastic material is not injected at the first position, that is, the substantially rectangular opening 22c of the cover portion 22, the opening 22d at the rear of the upper surface, the elongated gap 22e, and the accommodating portion. An opening 21c or the like at the bottom of 21 can be provided to inject a second material of elastomeric material into the closed area at the second position. As a result, the elastic sheet 23, which is heat-sealed to the cover portion 22 and the containing portion 21 made of the first material, and made of the second material alone, the pressing leaf spring 24, the fixing leaf spring 26, and the leg portion 27. Can be easily manufactured.

The first mold member 61 and the first molded body are substantially parallel to the direction in which the relative distance is changed, and the length (L) in the direction in which the relative distance is changed is the difference in relative distance between the second position and the first position. The first molding has a boundary wall surface portion (61d, 22g, etc.) longer than (distance difference d), and is attached to the second mold member 62 in the position changing step. Accordingly, the gap (second gap 60b) formed between the first mold member 61 and the second mold member 62 at the second position has the first mold member 61 or the first molded body. It can be partitioned by a boundary wall surface portion (22 g, etc.). Then, the second material is injected into the second gap 60b partitioned by the boundary wall surface portion. Therefore, it is possible to form a region composed of the first material alone which is not backed by the second material as indicated by S in FIG.

Further, the boundary wall surface portion may be formed in a closed curve shape on a surface perpendicular to the direction in which the relative distance is changed. Thereby, the second gap 60b can be partitioned into the island-shaped space by the boundary wall surface portion, and the second material can be injected into the island-shaped space. Therefore, the space into which the second material is desired to be injected can be easily set by the layout design of the boundary wall surface portion.

The second gap may have at least one space partitioned by at least the boundary wall surface portion in a direction perpendicular to the direction in which the relative distance is changed, and different types of materials may be injected into the respective spaces. Thus, for example, in forming the elastic sheet 23, the pressing leaf spring 24, the fixing leaf spring 26, and the leg portion 27, a material (elastomer material) having a material or a color capable of appropriately exhibiting the functions required for each of them. ) Can be selected individually.

Note that the present invention is not limited to this embodiment, and can be various other embodiments.

For example, although the plastic material is used as the first material and the elastomer material is used as the second material for the second injection unit 55, the material is not limited to this, and various materials can be used. It is also possible to use the same material for the second material. Thereby, it can be molded using various materials.

When the first material and the second material are different materials, it is preferable that the second material has a lower melting temperature than the first material. This can prevent the first material from being melted and deformed when the second material is injected.

INDUSTRIAL APPLICABILITY The present invention can be used in the industry of synthetic resin molded products.

DESCRIPTION OF SYMBOLS 1... Container 2... Container main part 3... Lid part 4... Lid opening/closing button part 21... Accommodating part 22... Cover part 22f... Convex part 22g... Boundary wall part 23... Elastic sheet 23a... Peripheral part 23c... Arc-shaped tension Outer portion 24... Pressing leaf spring 24a... Leaf spring portion 24b... End portion 24c... Pressing leaf spring base 26... Fixing leaf spring 27... Leg portion 50... Injection molding device 51... Moving unit 52... Injection unit 53... Control device 54 ...First injection unit 55...second injection unit 56...spacer insertion unit 56b...spacer member 60a...first gap 60b...second gap 61...first mold member 61a...first sprue 61b...second sprue 61c...recessed portion 61d... Boundary wall surface portion 62... Second mold member L... Length of direction of changing relative distance of boundary wall surface portion d... Difference in relative distance between second position and first position t... Thickness of spacer member

Claims (4)

The first material is injected into the first gap between the first mold member and the second mold member at the first position where the first mold member and the second mold member are close to or in contact with each other. A first molding step of molding a first molded body,
A position changing step of positioning by making the relative distance between the first mold member and the second mold member longer than the relative distance at the first position;
A second molding step of molding a second molded body by injecting a second material into a second gap between the first mold member and the second mold member at a second position after the position changing step; Have
The first mold member and the second mold member are provided with a closed region where they abut at the first position and the first material is not injected,
The first molding step is configured to inject the first material into the first gap formed outside the closed region,
The second molding step injects the second material into the second gap between the first mold member and the second mold member formed inside the closed region at the second position. In the configuration,
In the first mold member and the second mold member, a bank forming gap portion that is longer than the difference in the relative distance between the first position and the second position is outside the closed region in the first gap. Is provided so as to continuously surround
In the first forming step, the first material is injected into the first gap including the bank forming gap portion,
The said 2nd shaping|molding process is a shaping|molding method which is a structure which inject|pours the said 2nd material into the said 2nd clearance gap enclosed by the bank part formed with the 1st material injected into the said bank formation clearance gap part. The molding method according to claim 1, wherein the first molded body is attached to the first mold member or the second mold member in the position changing step. The molding method according to claim 1, wherein the first material injected into the first gap and the second material injected into the second gap are different types of materials. A mold comprising a first mold member and a second mold member used in the molding method according to claim 1, 2, or 3,
The length in the direction in which the relative distance is changed is approximately parallel to the direction in which the relative distance is changed with the first molded body, and is part of the facing surface of the first mold member or the second mold member. A mold provided with a bank forming gap that is longer than the difference in the relative distance between the second position and the first position.

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