JP6776468B2 - Molds and containers - Google Patents

Description

The present invention relates to, for example, a molded body and a container for producing a molded product by injecting a heat-melted material into a mold.

Conventionally, when manufacturing a synthetic resin molded product, an injection molding method is generally used. In recent years, various methods have been developed as injection molding methods for combining and integrating different resin materials.

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, and the other mold is provided with a female mold facing the male mold and the female mold. Using a set of molds provided with a male mold, each divided body is injection-molded at the same time by the mold, and then one mold is slid so that the divided bodies left in each female mold face each other. By matching the molds with each other, the divided bodies are made to abut against each other. Then, the molten resin is injected onto the peripheral edge of the abutting surface so that the divided bodies are welded to each other.

However, in this method, two types (plurality) of male molds and two female molds must be provided in the mold, and it is necessary to switch the combination thereof for use, which is complicated.

Japanese Unexamined Patent Publication No. 62-87315

In view of the above problems, an object of the present invention is to provide a molded product and a container by a simple molding method in which different resin materials are combined and integrated.

The invention includes a first molded body according to the first material, the first molded body and having a different second material in the second molded body, the first molded body and the boundary wall portion between the second molded body The thickness direction length of the boundary wall surface portion of the first molded body is longer than the thickness direction length of the boundary wall surface portion of the second molded body, and the first molded body is the second molded body. The first molded body and the second molded body have a portion that overlaps in the thickness direction inside the first molded body that continuously surrounds the outer circumference of the first molded body, and the overlapping portion. The length in the thickness direction of the boundary wall surface portion of the first molded body is longer than the length in the thickness direction of the second molded body, and the first molded body and the second molded body are in the thickness direction. In the overlapping portion, the first molded body is overlapped and exists only in one of the thickness directions with respect to the second molded body, and the first molded body is not present in the other in the thickness direction with respect to the second molded body. It is characterized in that it is a molded product and a container.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a molded product and a container by a simple molding method in which different resin materials are combined and integrated.

Perspective view of the container (wet tissue case). An exploded perspective view of the container including the container body in the open state. A cross-sectional view of the container body. Explanatory drawing explaining the injection molding apparatus. Explanatory drawing explaining each process of molding a container body part. The flowchart which shows the operation of an injection molding apparatus.

Hereinafter, an embodiment of the present invention will be described together with drawings and the like.

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

The container 1 is composed of three parts: a container body 2, a lid 3, and a lid open / close button 4.
The lid portion 3 has a substantially rectangular shape, covers a part of the upper surface of the container body portion 2, and is connected to the container body portion 2 via a hinge portion 31 provided at the rear portion.

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

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

The container main body 2 is formed by integrally molding the accommodating portion 21, the cover portion 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 front end portion and the lower end portions of the left and right side surface portions. The accommodating portion 21 is provided with a protruding portion 21a projecting upward at the upper end portion of the entire peripheral surface portion. When the accommodating portion 21 is covered by the cover portion 22 from above, the protruding portion 21a of the accommodating portion 21 is fitted into the groove portion 22a of the cover portion 22. As a result, the cover portion 22 that covers the accommodating portion 21 does not move back and forth and left and right in that state.

The cover portion 22 is provided with a locking portion 22b at the lower part of the front surface. The accommodating portion 21 is provided with a locking receiving portion 21b on the upper part of the front surface on which the locking portion 22b of the cover portion 22 is engaged and disengaged. By locking the locking portion 22b of the cover portion 22 that covers the accommodating portion 21 to the locking receiving portion 21b of the accommodating portion 21, the cover portion 22 is unintentionally prevented from opening in the vertical direction.

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

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

Since the elastic sheet 23 is transparent or translucent, it is easy to grasp the presence or absence of a material (wet tissue) housed in the container 21 of the container body 2. In the elastic sheet 23, the arc-shaped overhanging portion 23c projects in an arc shape from three directions toward the center of the take-out opening 23b. Therefore, the wet tissue that is to be pulled out upward from the take-out opening 23b is likely to be located at the center of the take-out opening 23b, and the wet tissue can always be pulled out at the same position. The arc-shaped overhanging portion 23c has no angular portion on the outer circumference. Therefore, when the wet tissue is pulled out, there is little risk of it being caught in the arc-shaped overhanging portion 23c and torn. Further, the arc-shaped overhanging portion 23c is slightly curved toward the upper center. Therefore, when the wet tissue is pulled out, it is easily guided to the take-out opening 23b.

Further, the elastic sheet 23 is made of a synthetic resin elastomer material. Therefore, the arc-shaped overhanging portion 23c of the elastic sheet 23 can be deformed corresponding to the direction even if the wet tissue is pulled out diagonally upward, and the degree of freedom in the drawing direction of the wet tissue is increased. Increase. Further, the arc-shaped overhanging portion 23c of the elastic sheet 23 deformed in the pulling direction tends to return to the original shape after the wet tissue is pulled out. Therefore, the subsequent wet tissue that comes into contact with the arc-shaped overhanging portion 23c is less likely to be pulled out following the preceding wet tissue.

The cover portion 22 is provided with a pressing leaf spring 24 at the rear portion of the upper surface, where the end portion 24b presses the lid portion 3 upward.

The presser foot spring 24 is a substantially rectangular plate-shaped body protruding upward from the opening 22d at the rear of the upper surface of the cover portion 22, and is arranged so that the plate-shaped body surfaces are parallel to each other in the left-right direction (see FIG. 1). ). The presser foot spring 24 has a leaf spring portion 24a that protrudes upward from the opening 22d and then extends while bending diagonally forward, and an end portion 24b that is connected to the leaf spring portion 24a and bends in the front horizontal direction. ing. The presser foot spring 24 is thicker on the opening 22d side and gradually thinner toward the end 24b side. The presser foot spring 24 is made of a synthetic resin elastomer material. The presser foot spring 24 is connected to the presser foot spring base 24c, which is also made of a 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 presser foot spring 24 are made of a synthetic resin elastomer material. Therefore, the lid body portion 3 can be pushed open by being pressed upward by the elastic force of the presser foot spring 24. When the lid body 3 is closed, the presser foot spring 24 falls forward and is housed in the gap between the lid body 3 and the upper surface of the cover 22.

The cover portion 22 is provided with a button base portion 25 for attaching the lid body open / close button portion 4 to the front portion of the upper surface.
The button base 25 has a substantially arcuate shape as if the lid opening / closing button portion 4 having a substantially arcuate shape is slightly smaller. The lid opening / closing button portion 4 is installed so that the string portion 4b overlaps the string portion 25b of the button base 25 and covers the button base 25 from above.

The cover portion 22 is formed with an elongated gap 22e along the arc portion 25a between the upper portion of the front surface and the arc portion 25a of the button base portion 25. A fixing leaf spring 26 for connecting the arc portion 25a of the button base portion 25 to the upper 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 a synthetic resin elastomer material, 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 arc portion 25a side connected to the fixing leaf spring 26 having elastic force is pushed down on the button base portion 25 that supports the lid opening / closing button portion 4. .. Along with this, the arc portion 4a side of the lid opening / closing button portion 4 is pushed down, and as a result, the string portion 4b of the lid opening / closing button portion 4 on the opposite side is dragged forward. As a result, the locking receiving portion 41 provided on the string portion 4b of the lid opening / closing button portion 4 and the locking protruding portion 32 provided on the front end portion 3a of the lid portion 3 are released from the lock. The lid portion 3 will be opened (see FIG. 1).

The accommodating portion 21 is provided with a substantially rectangular opening 21c at the four corners of the bottom portion. The substantially rectangular opening 21c at the bottom of the accommodating portion 21 is provided with a quadrangular pyramid-shaped leg portion 27 projecting downward.

The legs 27 are made of a synthetic resin elastomer material. The legs 27 are connected to the leg base 27a, which is also made of a synthetic resin elastomer material and is heat-sealed around the opening 21c at the bottom of the housing portion 21. Since the legs 27 are made of a synthetic resin elastomer material, they function as anti-slip when 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. May be good.

<Injection molding equipment>
FIG. 4 is an explanatory diagram illustrating the injection molding apparatus 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 operation of the moving unit 51, the injection unit 52, and the spacer insertion unit 56.

The moving unit 51 is driven by attaching the first mold member 61 and the second mold member 62 constituting the mold 60 to change the relative distance between the first mold member 61 and the second mold member 62. It has a mechanism 51a. A toggle method or a direct pressure method 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 by using the drive mechanism 51a. I'm letting you.

The second mold member 62 incorporates an eject pin 51b for extruding and removing the completed molded product from the second mold member 62. 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 types of units, a first injection unit 54 and a second injection unit 55. The injection unit 52 has an injection mechanism for injecting the molten material into the gap 60a between the first mold member 61 and the second mold member 62. There are various injection mechanisms, but in this example, the 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 a first material, and the second injection unit 55 injects an elastomer material as a second material.

The first injection unit 54 and the second injection unit 55 are hoppers 54a and 55a for receiving materials (first material and second material), respectively, and heaters 54b and 55b are provided on the outer periphery and are internally charged from the hoppers 54a and 55a. Cylindrical cylinders 54c and 55c that heat and melt the raw material, screws 54d and 55d that are inserted into the cylinders 54c and 55c and perform rotational and forward / backward movements to knead and inject the melted material, and screws 54d. , 55d is provided with motors 54e and 55e for executing rotary motion and forward / backward motion.

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

The spacer insertion unit 56 has a spacer member 56b sandwiched between the first mold member 61 and the second mold member 62, and the spacer member 56b between the first mold member 61 and the second mold member 62. It has a spacer drive mechanism 56a for inserting or removing the spacer. The spacer member 56b is sandwiched between the first mold member 61 and the second mold member 62 in an adjacent outer peripheral portion. The thickness of the spacer member 56b in the direction of changing 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 composed of a CPU and 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 non-volatile data. A storage unit composed of a memory or the like, a medium processing unit for reading data or a program from a storage medium 53a such as a CD-R, a moving unit 51 and an injection unit 52 (a first injection unit 54) via an I / O cable. It is provided with an I / O interface unit that inputs / outputs data and signals between the second injection unit 55) and the spacer insertion unit 56. 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 by the moving unit 51, controls the injection operation of the first injection unit 54 and the second injection unit 55, and the spacer member by the spacer insertion unit 56. The insertion and removal operations of 56b are controlled.

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

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

≪Molding method of container body≫
The control unit of the control device 53 transmits a forward 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 each other or in contact with each other. (Molding: Step S1).

The first mold member 61 is provided with a recess 61c that opens facing the gap (first gap 60a) between the first mold member 61 and the second mold member 62. The recess 61c has a boundary wall surface portion 61d that is substantially parallel to the direction of changing the relative distance between the first mold member 61 and the second mold member 62 and has a length of L in the direction of changing the relative distance. (See FIG. 5 (A)). The recess 61c is formed so as to continuously surround the outside of the region (closed region) forming the second gap 60b.

The control unit transmits an injection holding pressure signal to the first injection unit 54 to inject the first material of the molten thermoplastic material. The first material injected from the first injection unit 54 is injected into the first gap 60a through the first sprue 61a of the first mold member 61. 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 hold a predetermined pressure to the first member. (Holding pressure) is controlled (first injection, holding pressure: step S2).

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

The convex portion 22f (bank) corresponding to the concave portion 61c (gap portion for forming the bank) of the first mold member 61 is also molded in the first molded body (cover portion 22 of the container main body 2). Then, in the convex portion 22f, the relative distance is changed substantially parallel to the direction in which 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, is changed. A boundary wall surface portion 22 g having a length of L in the direction of movement is formed (see FIG. 5 (B)).

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 is set to the relative distance at the first position by the thickness of the spacer member 56b. The second mold member 62 is moved so as to be positioned at the intermediate mold opening position longer than the distance obtained by adding the distance of t (intermediate mold opening: step S4a).

Here, the thickness t of the spacer member 56b is set to 0.8 to 1.2 mm, and is relative to the intermediate mold opening position between the first mold member 61 and the second mold member 62. 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 the intermediate mold opening position can be arbitrarily set, and can be 0.9 mm to 4.2 mm, preferably 1.3 mm to 3.2 mm, and 1.6 mm to 3.2 mm. It is more preferably 2.7 mm, and more preferably 1.8 mm to 2.2 mm.

The control unit transmits 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 (intermediate position type closing: step S4c).

By executing each of the steps of opening the mold in the middle (step S4a), inserting the spacer (step S4b), and closing the mold in the middle position (step S4c) in this way, the second mold member 62 becomes the first mold member 61. The relative distance between the mold member 62 and the second mold member 62 is positioned at the second position, which is longer than the relative distance at the first position by a distance difference d. The distance difference d at this time is set to be equal to the thickness t of the spacer member 56b. At that time, the first molded body moves along with the second mold member 62, and the contact state between the first molded body 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 arbitrarily set. It is possible, it can be between 0.1 mm and 3 mm, preferably between 0.5 mm and 2 mm, more preferably between 0.8 mm and 1.5 mm, and about 1 mm. Is preferable.

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 distance moving direction between the first mold member 61 and the second mold member 62, that is, the thickness direction of the first molded body). The length) is set to be longer than the distance difference d. Therefore, the outer circumference 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. It is continuously partitioned by the portion 22g (see FIG. 5C).

The control unit of the control device 53 transmits an injection holding pressure signal to the second injection unit 55 to inject the second material of the molten 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 passes through the boundary wall surface of the convex portion 22f of the first molded body (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 in the second gap 60a, the control unit applies an injection pressure (to the second injection unit 55) so as to apply and hold a predetermined pressure to the second member. (Holding pressure) is controlled (second injection, holding pressure: step S5). At the time of this second injection, since the outer circumference 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, by forming the convex portion 22f (bank) at the time of the first injection, the flow of the material at the time of the second injection is regulated, and the range in which the second material flows 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 a molded body in which the two materials are doubly overlapped.

The control unit keeps the second injection unit 55 in a state where the injection pressure (holding pressure) is controlled for a predetermined time (cooling: step S6). In the meantime, the molten second member filled in the second gap 60a is cooled by the cooling water flowing inside the first mold member 61 and the second mold member 62 and solidified to form the second molded body. To do. At the same time, the second molded body is heat-sealed at a portion that comes into 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 5 (D)).

The control unit transmits a backward 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 along 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 transmits 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 apparatus 50 (removal of the molded product: 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 ends the process (ejector retreat: step S10).

The first mold member 61 may be provided with a convex portion protruding 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 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 the length in the direction in which the relative distance is changed is L. 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 formed at the boundary of the convex portion of the first mold member 61. It can be partitioned by the wall surface (position change: step S4).

≪How to mold the lid and the lid open / close button part≫
Further, the lid body portion 3 and the lid body open / close button portion 4, which are parts other than the container body portion 2 of the container 1, can also be molded by using the injection molding apparatus 50 described above. In these moldings, in the flowchart (see FIG. 6) showing the operation of the injection molding apparatus 50 described above, (position change: step S4), (second injection, holding pressure: step S5) and (cooling). : Each step of step S6) can be omitted.

Based on the above configuration and operation, the above-mentioned 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 in close proximity to or in contact with each other. Between the first molding step of injecting the first material of the plastic material into the first gap 60a between the members 62 and molding the first molded body, and between the first mold member 61 and the second mold member 62. The second gap between the first mold member 61 and the second mold member at the second position after the position change step and the position change step of positioning the relative distance of the first position longer than the relative distance at the first position. It is provided with a second molding step of injecting a second material of an elastoma material into 60b to form a second molded body. Therefore, the container main 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 from the first material and removed from the first set of molds as in the conventional case, and the next second set of molds is used. This set of molds can be used with only one set of molds (first mold member 61 and second mold member 62) without performing multiple steps such as setting the second molded body in the mold and pouring the second material into the mold. By the time the molded body is removed from the mold, the first formed body can be formed by the first material, and then the second formed body can be continuously formed by the second material.

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

Further, 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, a two-layer or multi-layer laminate made of the same type of material can be easily produced. The laminated body thus produced has a small internal stress and is less likely to change in shape with time after completion.

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

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 the relative distance between the second position and the first position. It has a boundary wall surface portion (61d, 22g, etc.) longer than (distance difference d), and the first molded body is attached to the second mold member 62 in the position changing step. As a result, the first mold member 61 or the first molded body has a gap (second gap 60b) formed between the first mold member 61 and the second mold member 62 at the second position. It can be partitioned by a boundary wall surface (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 a single first material that is not backed by the second material as shown by S in FIG.

Further, the boundary wall surface portion may be formed in a closed curve shape on a plane perpendicular to the direction in which the relative distance is changed. As a result, the second gap 60b is 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 in which the second material is to be injected can be easily set by the arrangement design of the boundary wall surface portion.

The second gap may have at least one or a plurality of spaces partitioned in a direction perpendicular to the direction in which the relative distance is changed by the boundary wall surface portion, and different types of materials may be injected into each space. As a result, 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 having a material, a color, or the like that can appropriately exert the functions required for each (elastomer material). ) Can be selected individually.

The present invention is not limited to the present embodiment and may be various other embodiments.

For example, a plastic material is used as the first material, and the second injection unit 55 uses the elastomer material as the second material, but the present invention is not limited to this, and various materials can be used, and the first material can be used. And the same material can be used for the second material. This makes it possible to mold using various materials.

When the first material and the second material are different materials, it is preferable that the second material is a material having a lower melting temperature than the first material. This makes it possible to prevent the first material from melting and deforming when the second material is injected.

The present invention can be used in the synthetic resin molded product industry.

1 ... Container 2 ... Container body 3 ... Lid 4 ... Lid open / close button 21 ... Accommodation 22 ... Cover 22f ... Convex 22g ... Boundary wall surface 23 ... Elastic sheet 23a ... Peripheral 23c ... Arc-shaped tension Outlet 24 ... Presser leaf spring 24a ... Leaf spring 24b ... End 24c ... Presser leaf spring base 26 ... Fixing leaf spring 27 ... Leg 50 ... Injection molding device 51 ... Moving unit 52 ... Injection unit 53 ... Control device 54 ... 1st injection unit 55 ... 2nd injection unit 56 ... Spacer insertion unit 56b ... Spacer member 60a ... 1st gap 60b ... 2nd gap 61 ... 1st mold member 61a ... 1st sprue 61b ... 2nd sprue 61c ... Recess 61d ... Boundary wall surface portion 62 ... Second mold member L ... Length in the direction of changing the relative distance of the boundary wall surface portion d ... Difference in relative distance between the second position and the first position t ... Thickness of the spacer member

Claims (5)

It has a first molded body made of a first material and a second molded body made of a second material different from the first molded body.
In the boundary wall surface portion between the first molded body and the second molded body, the thickness direction length of the boundary wall surface portion of the first molded body is larger than the thickness direction length of the boundary wall surface portion of the second molded body. It is long and the first molded body continuously surrounds the outer circumference of the second molded body.
A portion in which the first molded body and the second molded body overlap in the thickness direction is provided inside the first molded body that continuously surrounds the first molded body.
The length of the overlapping portion in the thickness direction of the second molded body is longer than the length of the boundary wall surface portion of the first molded body in the thickness direction.
In the portion where the first molded body and the second molded body overlap in the thickness direction, the first molded body overlaps only in one of the thickness directions with respect to the second molded body, and the first molded body overlaps the second molded body. A molded body having a structure in which the first molded body does not exist on the other side in the thickness direction. The portion of the first molded body that continuously surrounds the outer circumference of the second molded body is formed by a convex portion that projects to the other in the thickness direction.
The boundary wall portion is a boundary wall portion between the convex portion of the first molded body and the second molded body,
The molded product according to claim 1, wherein the length of the overlapping portion in the thickness direction of the second molded body is longer than the length of the convex portion of the first molded body in the thickness direction of the boundary wall surface portion. The second molded body has one or more second molded body projecting portions other than the end portions, which project upward.
The molded product according to claim 1 or 2, wherein the first molded product protrudes downward and has at least one protruding portion of the first molded product having the boundary wall surface portion other than the end portion. The molded product according to claim 3, wherein at least one tip portion of the second molded product protruding portion is bent in the horizontal direction. With the container body
A lid portion that covers a part of the upper surface of the container body portion and is connected to the container body portion via a hinge portion provided at the rear portion.
A lid opening / closing button portion provided on the front portion of the upper surface of the container body portion and a locking receiving portion provided on the rear portion for locking the locking protrusion provided on the front end portion of the lid body portion.
With
The container main body has an accommodating portion that opens upward and a cover portion that covers the accommodating portion from above and is openably and closably connected.
The cover portion includes an elastic sheet having a take-out opening that covers the peripheral edge of the opening in the center of the upper surface, a holding leaf spring whose end presses the lid portion upward at the rear portion of the upper surface, and the lid opening / closing button. A leaf spring for fixing is provided between the button base on the front part of the upper surface and the upper part on the front surface to attach the part.
The material of the container body is the first material.
The elastic sheet is a second material whose material is different from that of the first material.
The container main body has an opening, a convex portion that continuously surrounds the opening, and the elastic sheet provided inside the convex portion.
A container in which the outer circumference of the elastic sheet is in contact with a boundary wall surface portion on the inner surface of the convex portion.

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