JP6023661B2 - Container manufacturing method and mold apparatus used for container manufacturing - Google Patents

Description

  The present invention relates to a container manufacturing method for integrally forming a box-shaped container, and a mold apparatus used for container manufacturing.

  In general, a box-shaped container opened upward is integrally formed by filling a molten thermoplastic resin into a cavity formed by a mold apparatus and solidifying the cavity. In addition, there is a technique of providing a mechanism for injecting a molten resin material such as a gate or a sprue into a cavity with respect to a slide mold for molding a side surface outside the container (for example, Patent Document 1) reference.).

  By the way, when a part of the container (for example, a part of the side wall) is made of another resin material (for example, a transparent resin material), for example, for molding a part made of another resin material. The mold is configured to be slidable between a position in contact with a molding surface of the mold facing the mold and a position separated from the mold, and another resin material in a molten state with respect to the slide mold It is conceivable to provide a mechanism for injecting into the cavity.

JP 2011-20265 A

  However, when a mechanism for injecting the resin material into the cavity is provided for the slide mold, pressure is applied from the inside to the slide mold having the mechanism when the resin material is injected. It will be. For this reason, for example, when the slide mold is relatively small, or there are parts or parts with low durability in the slide mold, there is a concern that the slide mold may be damaged. In addition, a mechanism for injecting resin material into the cavity (including heaters depending on the type) is provided in the slide mold, which is a relatively small mold part compared to other mold parts. In addition, there is a concern that the slide mold, and thus the mold apparatus as a whole may be increased in size and complexity, which may lead to an increase in cost and a need to prepare a relatively large injection molding machine. Furthermore, the mechanism for injecting the resin material into the cavity greatly reduces the degree of freedom of the shape of the slide mold provided with the mechanism, and thus the degree of freedom of the shape of the portion formed by the slide mold. Is concerned.

  The present invention has been made to solve the above-described problems and the like, and its purpose is to manufacture a container partially made of a different resin material while suppressing adverse effects on the mold. An object of the present invention is to provide a container manufacturing method and a mold apparatus used for container manufacturing.

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1. A bottom wall, and a side wall portion extending upwardly from said bottom wall, with to such a box shape opening upward, the side wall portion, a flange upper outwardly projecting, outwardly And a lower flange protruding to the
A method for manufacturing a container comprising a first resin material and a second resin material different from the first resin material,
The mold apparatus for molding the container is at least
A male mold for molding the inner surface of the container;
A part of the outer surface of the container is molded, and a movable core mold that is displaceable between a closed position that contacts the molding surface of the male mold and a molding position that is separated from the molding surface of the male mold,
A first filling step of filling the first resin material in a molten state with respect to a first cavity formed in the mold device by setting the moving core mold to the closed position;
After the first resin material filled in the first cavity in the first filling step is solidified, the movable core mold is formed between the movable core mold and the male mold by setting the movable core mold to the molding position. A second filling step of filling the second resin material in a molten state with respect to the second cavity,
By solidifying the second resin material filled in the second cavity, a box-shaped container is integrally formed,
In the second filling step, a second resin injection port for injecting the second resin material into the second cavity is located at a position facing the molding surface of the moving core mold in the closed position in the male mold. To provide ,
A method for manufacturing a container , wherein a part of a side wall between the upper flange and the lower flange is formed by a forming surface of the moving core mold at the forming position .

  According to the means 1, in the mold apparatus for molding the container, the movable core mold is provided that is displaceable between a closed position that contacts the molding surface of the male mold and a molding position that is separated from the molding surface of the male mold. By this, the container comprised by the 1st resin material and the 2nd resin material can be manufactured reliably.

  Further, the second resin injection port for injecting the second resin material in a molten state into the second cavity for molding the portion constituted by the second resin material in the container is provided in the moving core mold. Rather, it is formed in a male mold. For this reason, for example, when a resin material is injected into the moving core mold, a mechanism for injecting a resin material such as the second resin injection port into the cavity is provided. A situation in which pressure is applied from the inside can be avoided. Therefore, damage to the moving core mold can be prevented without enlarging the moving core mold so as to withstand the pressure from the inside of the moving core mold.

  On the other hand, the male mold is relatively large compared to the moving core mold. For the male mold, a mechanism for injecting the resin material into the cavity is provided, and when the resin material is injected into the cavity, Even if pressure is applied, there is no risk of damage.

  Furthermore, it is a relatively small mold part compared to other mold parts, and for moving core molds that must also be equipped with a configuration to displace between the closing position and the molding position, resin A mechanism for injecting a material into the cavity, more specifically, a second resin inlet and a resin flow path (sprue, runner) leading to the second resin inlet, a mechanism for opening and closing the second resin inlet, and a resin flow path There is no need to provide a heater, a heat insulating material or the like for heating. For this reason, it is possible to avoid complication and enlargement of the moving core mold. Therefore, it is possible to prevent an increase in size and cost of the mold apparatus as a whole. Furthermore, the injection molding machine for supplying the resin material to the mold apparatus can be used even if it is not particularly large, so the choice of the injection molding machine to be used is increased and the convenience is improved. be able to.

  In addition, as in the case where a mechanism for injecting the resin material into the cavity is provided in the moving core mold, the shape of the moving core mold, and hence the portion formed by the moving core mold, in consideration of the space, etc. It is possible to avoid a situation in which the degree of freedom in shape is greatly reduced.

Mean 2. The male mold is configured as a fixed mold,
The container according to claim 1, wherein the male mold is provided with a first resin injection port for injecting the first resin material into the first cavity in the first filling step. Method.

  According to the means 2, the male mold provided with the second resin inlet is configured as a fixed mold. For this reason, for example, as in the case where the male mold is configured as a movable mold, the mechanism for injecting the resin material into the cavity does not have to be configured so as to be compatible with the displacement operation of the male mold. Simplification of the configuration of the mold apparatus can be achieved. Furthermore, not only the second resin inlet but also the first resin inlet is provided in the male mold. Therefore, it is possible to further simplify the configuration of the mold apparatus.

  “The mold apparatus has a first resin flow path for guiding the first resin material supplied from the first injection means to the first resin injection port, and the second resin supplied from the second injection means. A second resin flow path for guiding material to the second resin injection port, a connection port of the first resin flow path to the first injection means side, and the second injection of the second resin flow path. Both of the connection ports with the means side may be formed on a surface of the same mold facing the same direction. In this case, simplification of the mold apparatus and improvement in workability at the time of mounting the mold apparatus and the injection means can be achieved.

Means 3. The mold apparatus is
It has a plurality of slide molds that mold the outer side of the container,
The container manufacturing method according to claim 1 or 2, wherein the moving core mold is provided so as to be relatively displaceable with respect to at least one slide mold.

  According to the means 3, the degree of freedom of the shape of the side surface outside the container can be improved. For example, it is possible to form two rows of upper and lower ribs (undercut portions between the ribs) extending in the horizontal direction. Further, according to this means 3, the moving core mold is provided in the slide mold, and a mechanism for operating the mold is doubled compared to the case where the moving core mold is provided in the fixed mold. Therefore, the configuration of both the moving core mold and the mold provided with the moving core mold is complicated. In such a configuration, when a mechanism for injecting a resin material into the cavity is further provided to the moving core mold, the concern such as the complication of the structure becomes more remarkable. In this regard, like the above means 1, by providing a mechanism for injecting the second resin material such as the second resin injection port into the second cavity in the male mold, the moving core mold and the slide mold provided with the same are provided. The complexity of the configuration with the mold can be minimized. Therefore, the effect of preventing the mold apparatus from becoming complicated and large is more remarkably exhibited.

Means 4. A bottom wall, and a side wall portion extending upwardly from said bottom wall, with to such a box shape opening upward, the side wall portion, a flange upper outwardly projecting, outwardly And a lower flange protruding to the
Primarily while being composed of a first resin material, a mold apparatus for molding a container composed of different second resin material part is the first resin material of the side wall portion, at least,
A male mold for molding the inner surface of the container;
A part of the outer surface of the container is molded, and a movable core mold that is displaceable between a closed position that contacts the molding surface of the male mold and a molding position that is separated from the molding surface of the male mold,
By setting the moving core mold to the closed position, a first cavity for forming a portion made of the first resin material in the container is formed,
By setting the movable core mold as the molding position, a second cavity for molding a portion made of the second resin material in the container is formed between the movable core mold and the male mold. ,
The second resin injection port for injecting the second resin material into the second cavity is provided at a position facing the molding surface of the movable core mold at the closed position in the male mold.
A mold apparatus, wherein a part of a side wall portion between the upper flange and the lower flange is molded by a molding surface of the movable core mold at the molding position .

  According to the means 4, it is possible to relatively easily manufacture a container partially made of the second resin material, which is different from the first resin material, while suppressing the complexity and enlargement of the mold apparatus.

It is a perspective view of a box-type container. It is sectional drawing of the metal mold apparatus which has a slide core metal mold | die in a closed position. It is sectional drawing of the metal mold apparatus which has a slide core metal mold | die in a molding position. It is sectional drawing of the metal mold | die apparatus in another embodiment. It is sectional drawing of the metal mold | die apparatus in another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. As shown in FIG. 1, the box-type container 1 includes a substantially rectangular plate-like bottom wall 2 having a pair of opposed long sides and a pair of opposed short sides, and the long sides of the bottom wall 2. A pair of long side wall portions 3 extending upward from the respective portions and a short side portion of the bottom wall portion 2 are respectively extended upward to connect the side edges of the pair of long side wall portions 3. A pair of short side wall portions 4 is provided. Further, the upper flange 5 projecting outward from the entire upper edge portion of the long side wall portion 3 and the short side wall portion 4, and the entire lower edge portion of the long side wall portion 3 and the short side wall portion 4. A lower flange 6 protruding outward and a vertical flange 7 connecting the upper flange 5 and the lower flange 6 are provided. These are integrally formed of polypropylene.

  In addition, as shown in FIG. 2 etc., in the range of the inner peripheral side of bottom wall part 2 rather than the inner surface of long side wall part 3 and short side wall part 4, along the outer periphery of bottom wall part 2, Support ribs 8 extending downward from the lower surface of the bottom wall portion 2 are provided, and in this embodiment, the lower surfaces of the lower flange 6 of the upper box-shaped container 1 are stacked by stacking the box-shaped containers 1 up and down. Is supported in contact with the upper surface of the upper flange 5 of the lower box-type container 1, and the support ribs 8 of the upper box-type container 1 are connected to the side walls 3, 4 of the lower box-type container 1. It is accommodated on the inner circumference side. Thereby, the box-shaped containers 1 can be stacked (stacked) up and down while preventing the positional displacement of the upper box-shaped container 1 in the horizontal direction with respect to the lower box-shaped container 1.

  In the present embodiment, most of the box-shaped container 1 (hereinafter referred to as “general portion 9”) is made of opaque polypropylene (hereinafter also referred to as “first resin material”). In the range including the central portion of the long side wall portion 3 (portion with a dotted pattern in FIG. 1), the transparent portion 10 made of transparent polypropylene (hereinafter also referred to as “second resin material”) Is provided.

  Next, a mold apparatus 21 for forming the box-shaped container 1 will be described with reference to FIGS. In FIG. 2 and FIG. 3, hatching that should be applied in the mold apparatus 21 is omitted for convenience.

  As shown in FIG. 2, the mold apparatus 21 is a fixed mold as a male mold for molding the inner surface (the upper surface of the bottom wall portion 2 and the inner surfaces of the side wall portions 3 and 4) of the box-shaped container 1. 22, a movable mold 23 for molding the lower surface of the box-shaped container 1 (bottom wall portion 2), a long side slide mold 24 for molding the outer surface of the long side wall portion 3, and the short side wall A short-side slide mold (not shown) that molds the outer surface and the like of the portion 4 is provided. Further, in the present embodiment, the fixed mold 22 also molds the upper surface of the upper flange 5, and the movable mold 23 also molds the lower surface of the lower flange 6 and the support rib 8, and the long side slide mold 24 and The short side slide mold is configured to mold the portion corresponding to the side wall portions 3 and 4 to be molded out of the lower surface and outer peripheral surface of the upper flange 5 and the upper surface and outer peripheral surface of the lower flange 6. .

  Further, in the present embodiment, in order to form the transparent portion 10 with respect to the one long side wall portion 3, the one long side slide mold 24 can be projected and retracted from the molding surface of the long side slide mold 24. A slide core mold 26 is provided as a moving core mold configured as described above. Hereinafter, the long side slide mold 24 provided with the slide core mold 26 is also referred to as a “slide base mold 28”. The molding surface of the slide core mold 26 of this embodiment is a flat surface. Further, the slide core mold 26 has a closed position where it comes into contact with a forming surface for forming the inner surface of the box-type container 1 of the fixed mold 22, and a forming surface and a surface of the slide base mold 28 from the forming surface of the fixed mold 22. It is configured to be displaceable between molding positions that are separated to one. In addition, a cylinder 29 for displacing the slide core mold 26 is mounted on the slide base mold 28.

  As shown in FIG. 2, the mold device 21 clamps the slide core mold 26 and closes the general portion 9 made of the first resin material in the box-shaped container 1. A first cavity 31 for molding is formed. Further, as shown in FIG. 3, after the first resin material in a molten state is filled into the first cavity 31 and solidified, the slide core mold 26 is displaced to the molding position, whereby the slide core mold A second cavity 32 for molding the transparent portion 10 made of the second resin material is formed between the mold 26 and the fixed mold 22.

  The fixed mold 22 has a first resin injection port 33 for injecting the first resin material into the first cavity 31 and a second resin injection port 34 for injecting the second resin material into the second cavity 32. And are provided. The second resin injection port 34 is formed in the fixed mold 22 at a position facing the molding surface of the slide core mold 26 in the closed position, more specifically, a position for molding the central portion of the transparent portion 10. Yes. On the other hand, the first resin injection port 33 is formed at a position in the fixed mold 22 where the upper surface of the upper flange 5 extending from the long side wall portion 3 on the side where the transparent portion 10 is not formed is molded. The mold apparatus 21 of the present embodiment is a hot runner type mold apparatus 21 including a heater 36 for keeping the resin in the runner 35 in a molten state, and includes a first resin injection port 33 and a second resin injection. The inlet 34 is a valve gate having a pin 37 capable of adjusting the flow of the molten resin.

  Further, the injection molding machine (not shown) used in the present embodiment is configured to be capable of injecting both the first resin material and the second resin material, and is capable of injecting the first resin material in a molten state. A nozzle and a second nozzle capable of injecting a second resin material in a molten state are provided. In the present embodiment, the function of injecting the first resin material of the injection molding machine constitutes the first injection means, and the function of injecting the second resin material constitutes the second injection means. Of course, two injection molding machines may be used.

  On the other hand, the mold apparatus 21 includes a locating ring 38 for positioning with the injection molding machine side and a sprue bush 40 forming a sprue 39, and a first connection port 41 connected to the first nozzle. And the 2nd connection port 42 connected with a 2nd nozzle is provided. The first connection port 41 communicates with the first resin injection port 33, and the second connection port 42 communicates with the second resin injection port 34. Furthermore, the 1st connection port 41 and the 2nd connection port 42 are formed in the surface which has faced the same direction of the same metal mold | die (fixed side mounting plate 44), especially the same plane in this embodiment.

  Next, a method for manufacturing the box-shaped container 1 will be described. First, the mold apparatus 21 is set in an injection molding machine and the mold is clamped. Further, the first cavity 31 is formed by displacing the slide core mold 26 to the closed position. The first cavity 31 is filled with the first resin material in a molten state and solidified.

  Subsequently, after the solidification of the first resin material filled in the first cavity 31 is completed, the slide core mold 26 is displaced to the molding position, and the second cavity 32 is interposed between the slide core mold 26 and the fixed mold 22. Form. The second cavity 32 is filled with the second resin material in a molten state and solidified. After the solidification is completed, the box-shaped container 1 formed by opening the mold is removed from the mold apparatus 21. As described above, the box-shaped container 1 in which the general portion 9 made of the first resin material and the transparent portion 10 made of the second resin material are integrally formed is obtained.

  As described in detail above, according to the present embodiment, in one long side slide mold 24 (slide base mold 28), the molding surface for molding the inner surface of the long side wall portion 3 of the fixed mold 22 By providing the slide core mold 26 that can be displaced between the closed position where it abuts and the molding position separated from the fixed mold 22, the first resin that constitutes the general part 9 in one of the long side walls 3. The transparent portion 10 made of the second resin material different from the material can be integrally formed. Thereby, even if it does not look inside from an upper opening, the box-type container 1 which can confirm an inside via the transparent part 10 can be obtained.

  The second resin inlet 34 for injecting the second resin material in a molten state into the second cavity 32 for molding the transparent portion 10 made of the second resin material is a slide core mold. It is not formed in 26 but in the fixed mold 22. Therefore, when injecting the resin material, for example, when a mechanism for injecting the second resin material such as the second resin injection port 34 into the second cavity 32 is provided to the slide core mold 26. A situation in which pressure is applied to the slide core mold 26 from the inside can be avoided. Accordingly, damage to the slide core mold 26 can be prevented without enlarging the slide core mold 26 so as to withstand the pressure from the inside of the slide core mold 26. In addition, it is possible to avoid damage to the configuration related to the injection of the second resin material.

  On the other hand, the fixed mold 22 is relatively larger than the slide core mold 26, and a mechanism for injecting a resin material into the cavity is provided for the fixed mold 22, and the resin material is injected into the cavity. Even if pressure is applied, there is no risk of damage.

  Furthermore, for the slide core mold 26 which is a relatively small mold part compared to other mold parts and which must also be equipped with a configuration for displacing between the closed position and the molding position, A mechanism for injecting the second resin material into the second cavity 32, more specifically, the second resin injection port 34, the resin flow path (sprue 39, runner 35) leading to the second resin injection port 34, and the second resin injection port 34. There is no need to forcibly pack a heater opening / closing mechanism, a heater 36 for heating the resin flow path, a heat insulating material, and the like. Therefore, complication and enlargement of the slide core mold 26 can be avoided. Therefore, it is possible to prevent the mold apparatus 21 as a whole from becoming large and cost from increasing. Furthermore, since the injection molding machine for supplying the resin material to the mold apparatus 21 can be used even if it is not particularly large, the choice of the injection molding machine to be used is increased, and the convenience is improved. Can be planned. In addition, as in the case where a mechanism for injecting the second resin material into the second cavity 32 is provided in the slide core mold 26, the shape of the slide core mold 26 and thus the slide core mold are balanced in consideration of space and the like. It is possible to avoid a situation in which the degree of freedom of the shape of the portion formed by the mold 26 is greatly reduced.

  In particular, in the present embodiment, the slide core mold 26 is provided on one long side slide mold 24 (slide base mold 28), compared with the case where the slide core mold 26 is provided on a non-operating mold. Since the mechanism for operating the mold is doubled, the configuration of both the slide core mold 26 and the slide base mold 28 provided with the slide core mold 26 becomes complicated. In such a configuration, in the case where a mechanism for injecting the second resin material into the second cavity 32 is provided for the slide core mold 26, the concern such as the complication of the structure becomes more remarkable. Become. In this respect, as described above, the mechanism for injecting the second resin material such as the second resin injection port 34 into the second cavity 32 is provided in the fixed mold 22, so that the slide core mold 26 and the slide base mold are provided. The complexity of the 28 configurations can be minimized. Therefore, the function and effect of preventing the mold device 21 from becoming complicated and large can be obtained more remarkably.

  According to the present embodiment, the second resin injection port 34 is provided, and the male mold for molding the inner surface of the box-type container 1 is configured as the fixed mold 22. For this reason, the mechanism for injecting the second resin material into the second cavity 32 does not have to be configured so as to be compatible with the displacement operation of the mold, and the configuration of the mold apparatus 21 can be simplified. Can be planned. Furthermore, not only the second resin injection port 34 but also the first resin injection port 33 is provided in the fixed mold 22. Accordingly, it is possible to further simplify the configuration of the mold apparatus 21.

  In addition, the first resin inlet 33 communicates with the first connection port 41 connected to the first nozzle of the injection molding machine, and the second resin inlet 34 communicates with the second nozzle of the injection molding machine. The second connection port 42 to be connected is formed on the same plane of the fixed side mounting plate 44 that supports the fixed mold 22 and is attached to the injection molding machine. For this reason, simplification of the mold apparatus 21 and improvement in workability when the mold apparatus 21 and the injection molding machine are attached can be achieved.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the said embodiment, most (general part 9) of the box-type container 1 is comprised with the opaque polypropylene as 1st resin material, and a part (transparent part 10) of one long side side wall part 3 is comprised. The second resin material is made of transparent polypropylene, but is not particularly limited to such a configuration, and the material, color, combination, and the like can be changed as appropriate. For example, the box-type container 1 may be made of other resin materials (thermoplastic resin or thermoplastic elastomer) such as polyethylene, PET, and polyamide. The box-type container 1 may be composed of three or more types of resin materials.

  However, it is desirable that there is compatibility between the first resin material and the second resin material. In addition, when the portion made of the second resin material (the transparent portion 10 in the above example) has a lower strength than the portion made of the first resin material (the general portion 9 in the above example), For this reason, it is desirable that the entire outer periphery or most part of the portion made of the second resin material is surrounded by the portion made of the first resin material.

  (B) In the said embodiment, although it is actualized in the box-type container 1 which equips one long side wall part 3 with the transparent part 10, and the metal mold apparatus 21 for shape | molding it, the box-type container 1 There are no particular restrictions on the shape, size, shape, size, formation position, number of formation locations, and the like of the transparent portion 10. For example, instead of or in addition to the configuration in which the transparent portion 10 is provided on one long side wall portion 3, the transparent portion 10 may be provided on the short side wall portion 4. In addition, a mold apparatus for molding a container having a shallow bottom (for example, a tray having a bottom wall portion of two colors) or a container having a circular bottom (for example, a bucket having a partially transparent side surface). You may apply.

  Moreover, although the box-shaped container 1 of the said embodiment is provided with the upper flange 5 and the lower flange 6, while omitting the lower flange 6, you may comprise the box-shaped containers 1 so that nesting is possible. Further, in response to such a configuration, the mold for molding the outer surface of the side walls 3 and 4 is not a slide mold, but is integrated with a mold for molding the lower surface of the bottom wall 2 (movable mold 23). You may comprise.

  (C) In the above embodiment, the molding surface of the slide core mold 26 is a flat surface. For example, a reinforcement rib that is continuous (connected) to the reinforcement rib formed by the slide base mold 28 is molded. Asperities may be formed.

  In the above embodiment, the slide core mold 26 at the molding position is configured such that the molding surface thereof is flush with the molding surface of the slide base mold 28. However, the present invention is not limited to this. For example, it may be configured to be positioned closer to the molding surface of the fixed mold 22 than the molding surface of the slide base mold 28. In this case, the outer surface of the transparent part 10 is positioned one step inside the outer surface of the surrounding general part 9, and the situation where the outer surface of the transparent part 10 is rubbed and damaged by another member can be suppressed. it can. Alternatively, the molding surface of the slide core mold 26 may be spaced apart from the molding surface of the fixed mold 22 rather than the molding surface of the slide base mold 28, and the thickness of the transparent portion 10 may be greater than the thickness of the general portion. In this case, the strength of the transparent part 10 can be increased.

  (D) In the above embodiment, the male mold is configured as the fixed mold 22, but the male mold may be configured as a movable mold. However, when the male mold is movable, it is necessary to configure the mechanism for injecting the second resin material so that it can cope with the displacement of the male mold. 22 is desirable.

  Further, the number and arrangement of the first resin injection ports 33 and the second resin injection ports 34 are not particularly limited, and can be set as appropriate according to the shape and size of the container to be molded. For example, as shown in FIG. 4, the first resin injection port 33 may be formed in a portion of the fixed mold 22 where the bottom wall portion 2 of the box-type container 1 is molded.

  Further, although not specifically mentioned in the above embodiment, the method of sliding the long side slide mold 24 and the short side slide mold is not particularly limited, and for example, a movable type using an oblique guide pin or the like. It may be configured to be interlocked with the displacement of 23, or a cylinder or a motor may be used.

  In addition, in the above embodiment, the mold apparatus 21 is of a hot runner type, and the first resin injection port 33 and the second resin injection port 34 are valve gates. It is not a thing. For example, as shown in FIG. 5, the mechanism capable of opening and closing the second resin injection port 34 is omitted, and the second resin material is solidified in a resin flow path (runner 35) that guides the second resin injection port 34. You may comprise so that the 2nd resin material may be shape | molded integrally with the inner surface of the long side wall part 3. Further, for example, when the long-side slide mold 24 is interlocked with the displacement of the movable mold 23 using an oblique guide pin, the resin flow connected to the second resin injection port 34 is shown in FIG. By forming the path obliquely along the relative displacement direction of the long side slide mold 24 with respect to the fixed mold 22, the second resin material solidified in the resin flow path when the mold is opened can be extracted relatively smoothly. .

  DESCRIPTION OF SYMBOLS 1 ... Box type container, 2 ... Bottom wall part, 3 ... Long side side wall part, 5 ... Upper flange, 6 ... Lower flange, 9 ... General part, 10 ... Transparent part, 21 ... Mold apparatus, 22 ... Fixed mold , 23 ... movable mold, 24 ... long side slide mold, 26 ... slide core mold, 28 ... slide base mold, 31 ... first cavity, 32 ... second cavity, 33 ... first resin injection port, 34 ... 2nd resin injection port, 41 ... 1st connection port, 42 ... 2nd connection port.

Claims (4)

A bottom wall, and a side wall portion extending upwardly from said bottom wall, with to such a box shape opening upward, the side wall portion, a flange upper outwardly projecting, outwardly And a lower flange protruding to the
A method for manufacturing a container comprising a first resin material and a second resin material different from the first resin material,
The mold apparatus for molding the container is at least
A male mold for molding the inner surface of the container;
A part of the outer surface of the container is molded, and a movable core mold that is displaceable between a closed position that contacts the molding surface of the male mold and a molding position that is separated from the molding surface of the male mold,
A first filling step of filling the first resin material in a molten state with respect to a first cavity formed in the mold device by setting the moving core mold to the closed position;
After the first resin material filled in the first cavity in the first filling step is solidified, the movable core mold is formed between the movable core mold and the male mold by setting the movable core mold to the molding position. A second filling step of filling the second resin material in a molten state with respect to the second cavity,
By solidifying the second resin material filled in the second cavity, a box-shaped container is integrally formed,
In the second filling step, a second resin injection port for injecting the second resin material into the second cavity is located at a position facing the molding surface of the moving core mold in the closed position in the male mold. To provide ,
A method for manufacturing a container , wherein a part of a side wall between the upper flange and the lower flange is formed by a forming surface of the moving core mold at the forming position . The male mold is configured as a fixed mold,
2. The container according to claim 1, wherein the male mold is provided with a first resin injection port for injecting the first resin material into the first cavity in the first filling step. Production method. The mold apparatus is
It has a plurality of slide molds that mold the outer side of the container,
The said moving core metal mold | die is provided so that relative displacement with respect to at least 1 said slide metal mold | die is possible, The manufacturing method of the container of Claim 1 or 2 characterized by the above-mentioned. A bottom wall, and a side wall portion extending upwardly from said bottom wall, with to such a box shape opening upward, the side wall portion, a flange upper outwardly projecting, outwardly And a lower flange protruding to the
Primarily while being composed of a first resin material, a mold apparatus for molding a container composed of different second resin material part is the first resin material of the side wall portion, at least,
A male mold for molding the inner surface of the container;
A part of the outer surface of the container is molded, and a movable core mold that is displaceable between a closed position that contacts the molding surface of the male mold and a molding position that is separated from the molding surface of the male mold,
By setting the moving core mold to the closed position, a first cavity for forming a portion made of the first resin material in the container is formed,
By setting the movable core mold as the molding position, a second cavity for molding a portion made of the second resin material in the container is formed between the movable core mold and the male mold. ,
The second resin injection port for injecting the second resin material into the second cavity is provided at a position facing the molding surface of the movable core mold at the closed position in the male mold.
A mold apparatus, wherein a part of a side wall portion between the upper flange and the lower flange is molded by a molding surface of the movable core mold at the molding position .

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