JPH0880538A - Manufacture of plate member made of foamed synthetic resin, and built-up container made of foamed synthetic resin - Google Patents

Abstract

PURPOSE: To mold a plurality of plate members vertically with respect to a mold opening direction of a forming mold, mold a number of plate molding per mold area, and reduce the manufacturing cost. CONSTITUTION: When a plate member 6 is to be molded in a mold with a foaming thermoplastic resin, a plurality of the plate members 6 are molded in series through a thin connecting section 7 which intersects the plate faces of the members rectangularly. Thereafter, the plate members 6 are cut by the connecting section 7 so as to separate them from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plate-shaped member molded in-mold with a foamable thermoplastic resin, and further utilizing this method, for example, vegetables and fresh fish. It is possible to manufacture an assembled container that is a foamed synthetic resin container used as a storage container, a cold storage container, or the like, and that can be decomposed during transportation or after use to reduce the volume.

[0002]

2. Description of the Related Art Generally, a container made of a foamed synthetic resin as described above is formed to have a large wall thickness in order to ensure cold insulation and strength. Therefore, it is very bulky during transportation, storage after use, and processing. Therefore, there has been a strong demand for the foamed synthetic resin container to be an assembled container that can be assembled during use and can be disassembled during transportation or after use. Conventionally, as an assembled container made of foamed synthetic resin of this kind, side plates constituting the container body, molded in an expanded form in which adjacent members such as a bottom plate are connected by a hinge, and at the time of using the hinge part What is called a deployment box that is folded and assembled in a box shape, or what is called a deployment assembly box that is formed by separately molding the side plates, bottom plate, etc. that make up the container body, and inserting and fitting each member into a box shape, or There is a case in which each of the separated and formed members is connected with another hinge material to be assembled in a box shape.

[0003]

However, in the case of the conventional foamed synthetic resin assembly container as described above, there are problems in container strength, cold storage property, manufacturing cost, etc., and it is put to practical use. The current situation is not. For example, in the case of the former expansion box, not only is there a problem in the strength of the hinge part that connects each member, but in order to form the container in the expansion state, when it is formed in a series of box shapes. Compared with this, the number of molds taken per die area is reduced, resulting in higher cost. Moreover, when each member is connected by a hinge like this unfolding box, it cannot be thinly folded like a corrugated cardboard box because the thickness of the members is thick, and the volume ratio when folded to the volume when assembling is large. 1 if is a cardboard box
In contrast to the expansion box made of foamed synthetic resin, the expansion box can be reduced to about 0%, but at most about 50 to 60%, and the original purpose of the assembly box such as volume reduction cannot be sufficiently achieved.

Even in the latter case of expanding and assembling a box, for example, in the case of molding the side plate and the like forming the box with foam beads of a thermoplastic resin, as shown in FIG. When it is attempted to form the side plate c vertically along the opening direction X with the cavity mold b, the core mold a and the cavity mold b are opened as shown in FIG. Even if the product c is pushed out from the cavity mold b and released, the contact area between the molded product c and the cavity mold b along the mold release direction is large, and the cavity mold b is formed by foaming during molding. Is pressed in a direction Y orthogonal to the contact surface of the cavity mold a, the mold c is firmly sandwiching the mold c from both sides thereof, and the resistance between the mold c and the cavity mold b is large, Molded product c is released from cavity mold a So it is often difficult.

For this reason, conventionally, when molding each member of the expansion assembly box made of the foamed synthetic resin as described above, a molded product c such as a side plate is formed into a core mold as shown in FIGS. 6 and 7. Since there is no choice but to laterally mold the mold a and the cavity mold b, the number of molds taken per mold area becomes small, and the manufacturing cost increases, which is not practical. Moreover, in the case of this deploying and assembling box, the projecting ridges and the concave ridges extending in the depth direction of the boxes formed at the side end portions of the adjacent side plates are inserted and fitted to each other to be connected and assembled. When a molded product c such as a side plate is laid sideways with respect to the mold as shown in FIG. Instead, the cross-sectional shape of the convex ridges e and the concave ridges f formed on the molded product c may be a fitting portion shape having a thick tip and a thin root like a dovetail and a dovetail groove. Can not. For this reason, it is not possible to firmly connect the respective members by the fitting portions such as the protruding ridges e and the recessed ridges f into which the members are inserted and fit, and there is a problem in the strength of the box. For example, a gap is formed in the fitting portion and cold air escapes from the gap, which is inferior in terms of cold insulation property as compared with an integrally molded container.

In order to solve the problems of the strength and the cold insulation of the expansion box and the expansion / assembly box as described above, after assembling the box, adjacent members are reinforced with an adhesive tape or the assembled box is further Means such as putting in a bag were also considered, but when such a means is adopted, not only the cost is further increased, but also extra work is required at the time of assembling and disassembling. This is the same in the case of an assembly box having a structure in which each member forming the box is connected by another hinge member.

As described above, in the conventional assembly container made of foamed synthetic resin, problems such as its strength, cold storage property, and manufacturing cost are major obstacles to practical use, and the volume reduction ratio at the time of disassembly is also high. Not as good as a box. Therefore, at present, as an assembly container made of expanded synthetic resin,
It can be said that none have been put to practical use. In view of the present situation of the foam synthetic resin assembling container as described above, the present invention has a large strength and is excellent in cold insulation, etc. Further, it does not take time and effort for assembling and disassembling, and the productivity is improved. Therefore, it is an object of the present invention to provide an assembling container made of a foamed synthetic resin that can be manufactured without increasing the manufacturing cost as compared with an integrally molded container.

[0008]

In order to achieve the above object, in the present invention, when a plate-shaped member is molded in-mold with a foamable thermoplastic resin, a plurality of plate-shaped members are formed on their plate surfaces. A method for manufacturing a plate-shaped member made of synthetic resin foam, characterized in that after the plate-shaped members are molded in series through thin connecting portions that are orthogonal to each other, each plate-shaped member is cut at the connecting portions to separate them from each other. It is what

The above-mentioned plate-shaped member is manufactured by using a cavity mold and a core mold that can be inserted into and removed from the cavity mold. Forming a molding space which extends in the direction and is communicated between the respective plate-shaped molding spaces by a narrow communication portion orthogonal to the mold opening direction, and the molding space is filled with a foamable thermoplastic resin, Can be heat-foam-molded to form a plurality of plate-shaped members in series through thin connecting portions.

In the present invention, the expandable thermoplastic resin, for example, expandable thermoplastic resin particles (hereinafter sometimes simply referred to as "expandable resin beads") is used in the mold by utilizing the above method. A pair of plate-shaped members that are formed by molding and that are formed in a series of approximately U-shapes through thin connecting parts are cut at the connecting parts, and a plurality of the plate-like members are combined to form a container shape. Provided is an expanded synthetic resin assembly container.

In the above-mentioned assembled container, the opposing side plates of the container body can be composed of a pair of plate-shaped members formed in series.

Further, in the above case, the side edges of the adjacent side plates can be connected by inserting and fitting the fitting convex portion and the fitting concave portion extending in the depth direction of the container body.

Further, when forming the pair of side plates in series, projecting ridges for supporting the bottom plate are provided on the inner surfaces of both side plates, and the end portions of the ridges on both side plates are connected to each other. It is possible to form a pair of side plates in series.

Further, the bottom plate of the container body can also be composed of a pair of plate-shaped members formed in series in a substantially U-shape through a thin connecting portion.

Further, the cover plate can also be formed by a pair of plate-shaped members formed in series in a substantially U-shape through a thin connecting portion.

Further, the present invention also provides a foam synthetic resin assembly container in which a side plate of the container body is formed by connecting a plurality of plate-like members up and down.

In the above-mentioned case, the two sets of container bodies are vertically overlapped with each other by abutting their openings.
An assembled container can be constructed.

In the above case, the bottom plate of the container main body located in the upper position of the two sets of container main bodies that are stacked can be used as the cover plate.

Furthermore, the container can be assembled by connecting another plate-shaped member between the side plates of the two sets of container bodies which are superposed.

Further, a method for manufacturing an expanded synthetic resin-made container according to the present invention is a method for manufacturing an assembled container in which a plurality of plate-shaped members molded in-mold with a foamable thermoplastic resin are inserted into and fitted to each other. In the above, the two plate-shaped members are formed in a series of substantially U-shapes through the thin connecting portions, and then both plate-shaped members are cut at the connecting portions.

As a method of manufacturing the above-mentioned assembled container, a cavity mold and a core mold which is provided so as to be insertable into and removable from the cavity mold are used to form a pair of plate-shaped molding spaces. Forming a molding space extending in the mold direction and having a substantially U-shaped cross section formed by communicating between both plate-shaped molding spaces with a narrow communication portion,
The substantially U-shaped molding space may be filled with expandable thermoplastic resin particles, and the foamed thermoplastic resin particles may be heat-foam-molded to form a pair of plate-like members in series through a thin connecting portion.

[0022]

As described above, according to the present invention, for example, when a plate member made of expanded synthetic resin that constitutes an assembled container is manufactured, a plurality of plate members are formed in series through thin connecting portions. is there. Thereby, in the present invention, while suppressing the manufacturing cost of the assembled container and the like, the connection strength of each plate member is large, therefore, it is possible to provide an assembled container excellent in strength and cold insulation of the container, It was possible to put an assembled container made of expanded synthetic resin into practical use. This will be described in more detail with reference to the accompanying drawings.

That is, in the present invention, as shown in FIG.
By the cavity mold 1 and the core mold 2 that can be inserted into and removed from the cavity mold 1, a plurality of molds (a pair is shown in the figure) extending in the opening direction of the molds 1 and 2 can be formed. A plate-shaped forming space 3, 3 is formed, and a plate-shaped forming space 5 having a substantially U-shaped cross section is formed by connecting the plate-shaped forming spaces 3 and 3 to each other by a narrow communicating portion 4 orthogonal to the plate-shaped forming spaces 3 and 3. The molding space 5 is filled with foamed beads of a thermoplastic resin, and the foamed beads are heat-foamed and heat-sealed to each other, so that the pair of plate-shaped molded products 6, 6 have a thin connecting portion 7 It is molded into a connected state. The expandable thermoplastic resin used in the in-mold molding of the present invention is
Styrene-based resin such as polystyrene containing foaming agent, olefin-based resin such as polyethylene and polypropylene, and thermoplastic resin particles (also abbreviated as foamable resin gies) such as copolymer resin of these are put directly into the mold. The resin particles may be heat-foamed, or if necessary, the resin particles may be pre-foamed, and then the pre-foamed resin particles may be put into a mold for heat-foam molding. After molding in this way, the core mold 2 is extracted from the cavity mold 1 as shown in FIG. 2, and then the molded product 9 is molded from the cavity mold 1 by a releasing means such as an eject pin 8 as shown in FIG.
Take out. This molded product 9 is a pair of plate-shaped molded products 6, 6
Have a substantially U-shaped cross section connected by a thin connecting portion 7.

In this case, since the pair of plate-shaped molded products 6, 6 are molded in series in a substantially U-shaped cross section connected by the thin connecting portion 7, after the molding, the cavity mold 1 is moved to the core mold 2. After extraction, a space 10 is formed between the two plate-shaped molded products 6, 6 of the molded product 9 (state shown in FIG. 2). Therefore,
The molded product 9 can be easily released from the cavity mold 1 by a release means such as the eject pin 8. On the other hand, as described above, since each member is conventionally molded independently, the side plate c is formed along the opening direction X between the core mold a and the cavity mold b as shown in FIG.
When the core mold a and the cavity mold b are opened as shown in FIG. 5, the molded product c is pushed out from the cavity mold b by the eject pin d and is released from the mold as shown in FIG. However, since the contact area between the molded product c and the cavity mold b is large, it is very difficult to release the mold. For this reason, conventionally, as shown in FIG. 6 and FIG. 7, there is no choice but to lay the mold laterally with respect to the opening direction of the mold, resulting in a small number of molds per mold area, which causes an increase in manufacturing cost. Was there. Therefore, in the present invention, when molding a plate-shaped member that constitutes the assembled container or the like as described above, by molding a plurality of plate-shaped members in series in a state of being connected through a thin connecting portion, It is possible to form the strip-shaped member vertically with respect to the opening direction of the mold, and by increasing the number of molds taken per mold area, it is possible to improve productivity and reduce manufacturing costs. Further, according to the present invention, since a plurality of plate-shaped members are molded in one continuous molding space 9 in this manner, a mold release means such as a raw material feeder (not shown) or an eject pin 8 provided in the mold is also composed of a plurality of plates. It can also be used for molding a strip-shaped member, and the structure of the mold can be simplified. Although only the case of molding the pair of plate-shaped molded products 6 and 6 shown in the drawings has been described here, three or more plate-shaped molded products are similarly molded in series and then separated. Can also be used as an independent member.

Further, in the present invention, as described above, by molding the plate-shaped member vertically with respect to the opening direction of the mold, as shown in FIGS. 1 to 3, for example, a side plate of an assembly container or the like. In order to form the fitting portion 11 such as a convex strip or a concave strip as a fitting portion for inserting and connecting the plate-shaped members of the above in the plate-shaped molded products 6, 6 so as to extend in the mold opening direction, These fitting portions 11 can have any cross-sectional shape, and are formed by a fitting convex portion having a thick front end portion and a thin root portion and a corresponding fitting concave portion such as dovetail fitting. Strong fitting is possible. As a result, the strength of the container in the assembled state is improved, no gap is formed in the connecting portion of each member, and the container is also excellent in cold insulation.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on the specific embodiments shown in the accompanying drawings.

FIG. 8 shows an embodiment of an assembly container 20 made of expanded synthetic resin according to the present invention. This assembly container 2
Reference numeral 0 denotes a container body 21 that opens upward and a lid 22 that is detachably attached to the container body 21.
A large number of fitting protrusions 31 ... And 32. As shown in FIG. 9, the upper surface of the opening peripheral edge of the container body 21 and the fitting protrusions 31 and 32 formed on the lower surface of the peripheral edge of the cover plate 22 are alternately formed in two rows inside and outside of each peripheral edge. Has been done. And each convex portion 3
Reference numerals 1 and 32 are formed to have a shape that is slightly widened toward the top. As shown in FIGS. 10 and 11, when the lid 22 is attached to the container body 21, the protrusion 3 of the container body 21 is provided.
1 and the convex portion 32 of the lid body 22 are fitted to each other in the front, rear, left and right directions so that the container 20 can be reliably sealed.

In the container body 21, as shown in FIG. 12, two pairs of facing side plates 23, 23 and 24, 24 are connected to each other in a frame shape having a substantially square shape in plan view, and a bottom plate 28 is dropped therein. It is attached to and configured. Then, the adjacent side plates 23, 24 have the fitting projections 25 formed on the inner surfaces at both ends of the one side plate 23 and the other side plate 2 adjacent thereto.
4 is inserted into and fitted into the recesses 26 formed on the outer surfaces of both side ends of the side plate 4 from below, and is connected to the inner surface of the side end of one side plate 23 with the outer surface of the side end of the other side plate 24 abutting against each other. The supporting protrusions 29 and 30 for supporting the bottom plate 28 are formed on the lower inner surfaces of the side plates 23 and 24 connected in this manner.
And the bottom plate 28, as shown in FIG.
The lower surface of the peripheral portion is mounted in a state of being supported on the supporting convex portions 29 and 30. Further, in this embodiment, as the bottom plate 28, two plate-shaped members 27, 27 are connected to each other in a flat plate shape by fitting the convex stripes 40 and the concave grooves 41 formed on the opposite side end faces to each other. The one that has been adopted is adopted.

A pair of side plates 2 of the container body 21 facing each other.
As shown in FIGS. 14 and 15, a large number of fitting projections 31 ... That fit together with fitting projections 32 formed on the lower surface of the peripheral edge portion of the lid 22 are provided on the inner and outer surfaces 2 and 3. In addition, fitting convex strips 25, 25 are formed on the inner surfaces of the left and right ends, and are fitted into the fitting concave strips 26 formed on the side plates 24 connected thereto. The pair of side plates 23, 23 are formed into a series of U-shaped cross-sections in which the tips of the bottom plate supporting protrusions 29, 29 projecting from the lower portions of the inner surfaces of the side plates 23, 23 are connected by a thin connecting portion 33. It is cut by the thin connecting portion 33 and used as the side plates facing the container body 21.

Similarly, another pair of side plates 2 of the container body 21.
As shown in FIGS. 16 and 17, a large number of fitting projections 31 ... Are fitted to the fitting projections 32 formed on the lower surface of the peripheral edge of the lid 22 at the upper edge thereof. In addition, the fitting concave ridges 26, 26 into which the fitting convex ridges 25 formed on the side plates 23 connected thereto are inserted and fitted from below are formed on the outer surfaces on both the left and right ends. ing. The pair of side plates 24, 24 has a connecting portion 3 in which the tips of the bottom plate supporting protrusions 30, 30 projecting from the lower portions of their inner surfaces are thin.
After being formed into a series of substantially U-shaped cross-sections connected by 4, they are cut by the thin connecting portions 34 and used as a pair of opposing side plates constituting the container body 21.

Further, in this embodiment, as shown in FIGS. 18 and 19, the bottom plate 28 also has a pair of plate-like members 27, 27 from the one side edge, similarly to the side plates 23 and 24. The projections 35, 35 protruding in one direction are formed in a series in a substantially U-shaped cross section in which the tip ends of the projections 35, 35 are connected by a thin connecting portion 36, and the projections formed on the opposite side end surfaces of both plate-shaped members 27, 27. The strip 40 and the concave groove 41 are fitted to each other to form a continuous flat plate, which is used as the bottom plate 28. still,
In the case of this bottom plate 28, unlike the case of the both side plates 23, 24, without separating both plate-shaped members 27, 27,
By opening the connecting part 36 as a hinge to the left and right, it can be used as the bottom plate 28 in the form of a single plate.

Further, in this embodiment, as shown in FIGS. 15 and 17, the inner surfaces of the side plates 23 and 24 and the bottom plate supporting projection 2 are formed.
Recesses 42 and 43 are formed at the corners of the side plates 9 and 30, and the ridges 44 and 45 formed on the outer and lower surfaces of the peripheral edge of the bottom plate 28 shown in FIG. 19 are formed on the side plates 23 and 24. By fitting in the recessed portions 42 and 43, the side plates 23,
The bottom plate 28 can be mounted tightly on the inner surface of 24.

As described above, in the present invention, the side plates 23, 2 are
3, and 24, 24, and a pair of plate-shaped members 27, 27 constituting the bottom plate 28 are thin connecting portions 33,
Molded in a state of being connected in a substantially U-shaped cross section by 34 and 36, these are molded by in-mold molding with expandable resin beads, which is an example of expandable thermoplastic resin, as shown in FIGS. 1 to 3. Molding can be performed vertically along the mold opening direction, a large number of molds can be taken for the area of the mold, and efficient molding is possible.

Further, as described above, the side plates 23 and 24 are vertically formed with respect to the mold opening direction, so that the side plates 23 and 24 are formed adjacent to each other, and the side plates 23 and 24 are formed by inserting the side plates 23 and 24 into each other. Fitting ridge 25 formed by joining and connecting 24
The fitting recessed line 26 can have any cross-sectional shape. For example, as shown in FIG. 20, the fitting protrusion 25 formed on the one side plate 23 is formed into a dovetail shape having a thick front end portion 25a and a thin base portion 25b, and is inserted and fitted therein. By forming the fitting recessed line 26 formed on the side plate 24 side corresponding to the dovetail-shaped fitting projection line 25 into a dovetail groove shape that can be fitted and fitted in a substantially tight fit state, both side plates 23 and 24
Can be firmly fitted and connected, and the strength of the container body 21 to be assembled can be increased, and the side plates 23, 24
There is no gap between them, and the cold insulation property when the container 20 is used as a cold insulation container is improved.

As described above, in the foamed synthetic resin assembly container 20 according to the present invention, the fitting projections 25 and the fitting projections 26 formed on the adjacent side plates 23 and 24 are inserted into and fitted to each other. Frame-shaped connection, and then the bottom plate 28 inside
The container body 21 can be assembled and disassembled very easily by simply mounting the. Moreover, in the present invention,
The two pairs of side plates 23, 23 and 24, 24 constituting the container body 21 of the assembled container 20 are molded in series into a substantially U-shape through thin connecting portions 33, 34, respectively, to open the mold. The plate-shaped member can be formed vertically with respect to the mold direction, the number of molds per mold area does not decrease, and the productivity is good, so that the manufacturing cost can be kept low. Moreover, when the side plates 23, 24 are vertically formed along the mold opening direction in this way, the side protrusions 23, 24 are fitted to each other by fitting and fitting fitting ridges 25 and Since the fitting recessed line 26 is formed so as to extend in the opening direction of the mold, the cross-sectional shape thereof can be set to an arbitrary shape, and a gap or the like is not formed in the connecting portion between the side plates 23 and 24. Can be firmly connected. Therefore, the strength of the assembled container 20 is high, and at the same time, even when the assembled container 20 is used as a cold container, cold air does not escape from the connecting portion, and the cool property is excellent. .

Next, FIGS. 21 to 23 show another embodiment of the assembly container made of expanded synthetic resin according to the present invention. Foamed synthetic resin assembly container 50 of this embodiment
Is a large number of fitting projections 31 ... Formed on the upper surfaces of the openings of the two sets of container bodies 21A and 21B assembled as in the above embodiment with their openings abutting each other. By assembling and locking each other, one assembly container 50 is constructed by stacking them in upper and lower two stages. In this case, when the other container body 21B is superposed on the other container body 21A, the bottom plate 28B of the upper container body 21B is once removed and the container body 21B is turned upside down. 21A, and then the removed lid 28
It is possible to use the bottom plate 28B of the container body 21B as a cover plate of the assembled container 50 by reattaching B from above the bottom plate supporting convex portions 29, 30 provided on the inner surfaces of the side plates 23, 24 of the container body 21B. it can.

As described above, according to the present invention, two sets of the assembly container bodies 21A and 21B having the same structure are vertically stacked, so that the assembly container 50 having a different height can be easily assembled. Further, as shown in FIGS. 24 to 26, as described above, the container main body 21A stacked vertically in two stages.
Between 21 and 21B, the height of the container can be arbitrarily changed by appropriately connecting a frame body 39 in which side plates 37 and 38 having upper and lower fitting projections 31 ... Are connected in a frame shape. You can Further, in this drawing, the container body 21 is shown at the top.
Although the example in which Bs are stacked is shown, the frame 39 may be placed at the top. As the lid in that case, the lid plate 22 shown in the embodiment of FIG. 8 may be used.
As described above, according to the present invention, it is possible to extremely easily assemble assembled containers having different heights without increasing the types of parts.

[0038]

As described above, according to the method for manufacturing a foamed synthetic resin plate-shaped member according to the present invention, a plate-shaped member such as a side plate forming an assembly container is foamed of a thermoplastic resin. When molding in-mold using resinous resin beads, a plurality of plate-shaped members are formed in series through a thin connecting portion, so that these plate-shaped members can be formed in the opening direction of the molding die. It is possible to perform vertical molding with a large number of plate-shaped molded products per mold area, and it is possible to reduce the manufacturing cost. Moreover, in this case, like the side plate of the assembled container, the fitting portion formed on the joint surface of each member and inserted into and fitted to each other can be molded so as to extend in the mold opening direction, The cross-sectional shape of the fitting part can be set arbitrarily, the connection strength between the members to be connected is increased, and at the same time, there is no gap or the like in the connection part, and the assembly container is configured using this member. In this case, the container has excellent sealing property and cold storage property.

The assembly container according to the present invention can be assembled and disassembled extremely easily by only inserting the fitting portions of the side plate end portions formed as described above into each other, and Since each member after disassembly is separated from each other in the shape of a single plate, they can be stacked or stacked and transported or stored without bulk, and compared to the conventional assembled container in which each member is connected by a hinge. The reduction ratio of the volume at the time of disassembling to that at the time of assembling can be increased.

Further, the assembled container of the present invention as described above,
By connecting a plurality of plate-like members to the upper and lower sides to form the side plates, it is possible to easily construct the assembled containers having different heights.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a molding die showing a method for manufacturing a foam synthetic resin plate member according to the present invention.

FIG. 2 is a cross-sectional view showing a state where the molding die is opened.

FIG. 3 is a cross-sectional view showing how a molded product is released from the molding die.

FIG. 4 is a cross-sectional view of a molding die for manufacturing a plate member made of a foamed synthetic resin by a conventional method.

FIG. 5 is a cross-sectional view of a case where a molded product is to be released from a mold according to the conventional method.

FIG. 6 is a cross-sectional view of a molding die for manufacturing a conventional foamed synthetic resin plate member.

FIG. 7 is a cross-sectional view showing how a molded product is released from the conventional molding die.

FIG. 8 is a perspective view of a foam synthetic resin assembly container according to the present invention.

FIG. 9 is an enlarged plan view showing an essential part of a fitting portion between the container body and the lid of the assembled container.

FIG. 10 is an enlarged side view showing a main part of a fitting portion between the container body and the lid of the assembled container.

FIG. 11 is an enlarged vertical cross-sectional view of a fitting portion between the container body and the lid.

FIG. 12 is an exploded perspective view of a container body of the assembled container according to the present invention.

13 is a cross-sectional view taken along the line AA in FIG. 8.

FIG. 14 is a perspective view of a pair of side plates forming the assembled container during molding.

15 is a cross-sectional view taken along the line BB in FIG.

FIG. 16 is a perspective view of another pair of side plates constituting the assembled container during molding.

17 is a cross-sectional view taken along line CC of FIG.

FIG. 18 is a perspective view of the bottom plate that constitutes the assembled container during molding.

19 is a cross-sectional view taken along line DD of FIG. 18.

FIG. 20 is a cross-sectional plan view of a connecting portion between adjacent side plates of the assembled container.

FIG. 21 is a perspective view showing another embodiment of the foamed synthetic resin assembly container according to the present invention.

FIG. 22 is an exploded perspective view of the foam synthetic resin assembly container.

23 is a sectional view taken along line EE in FIG. 21.

FIG. 24 is a perspective view showing still another embodiment of the foamed synthetic resin assembly container according to the present invention.

FIG. 25 is an exploded perspective view of the foam synthetic resin assembly container.

26 is a sectional view taken along line FF in FIG. 24.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cavity mold 2 Core mold 3 Plate-shaped molding space 4 Communication part 5 Substantially U-shaped forming space 6 Plate-shaped molded product 7 Connecting part 8 Eject pin 9 Molded product 10 Space 11 Fitting part 20 Assembly container 21 Container body 22 Lid Body 23 Side plate 24 Side plate 25 Fitting convex strip 26 Fitting concave strip 27 Plate member 28 Bottom plate 29 Bottom plate supporting convex part 30 Bottom plate supporting convex part 31 Fitting convex part 32 Fitting convex part 33 Connecting part 34 Connecting part 35 Convex edge 36 connecting part 37 side plate 38 side plate 39 frame body 40 convex stripe 41 concave groove 42 concave recess 43 concave recess 44 convex stripe 45 convex stripe

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Claims (14)

[Claims] 1. When in-molding a plate-shaped member with a foamable thermoplastic resin, a plurality of plate-shaped members are molded in series via thin connecting portions orthogonal to their plate surfaces, A method for manufacturing a foamed synthetic resin plate-shaped member, which comprises cutting the plate-shaped member at the connecting portion to separate the plate-shaped members from each other. 2. A cavity mold and a core mold which is provided so as to be insertable into and removable from the cavity mold, wherein a plurality of plate-shaped molding spaces extend in the opening direction of both molds and each plate. To form a molding space in which the narrow molding spaces are communicated with each other by a narrow communication portion orthogonal to the opening direction, and the molding space is filled with a foamable thermoplastic resin, which is then heat-foam-molded to form a plurality of molding spaces. 2. The method for manufacturing a plate-shaped member made of a foamed synthetic resin according to claim 1, wherein the plate-shaped member is molded in series through a thin connecting portion. 3. A pair of plate-shaped members which are molded in-mold with a foamable thermoplastic resin and which are molded in a series of approximately U-shapes through a thin connecting portion are cut at the connecting portion to form the plate. A synthetic resin foam-made container, characterized in that a plurality of shaped members are combined and assembled into a container shape. 4. The foam synthetic resin assembly container according to claim 3, wherein the opposing side plates of the container body are constituted by a pair of plate-shaped members formed in series. 5. The foam synthesis according to claim 4, wherein the side edges of adjacent side plates are connected by inserting and fitting a fitting convex portion extending in the depth direction of the container body and a fitting concave portion corresponding thereto. Resin assembly container. 6. A pair of side plates are formed in series by projecting a ridge for supporting a bottom plate on each inner surface of a pair of opposing side plates, and connecting the end portions of the ridges on both side plates to each other. The foamed synthetic resin assembly container according to claim 4. 7. The foam synthetic resin assembly container according to claim 3, wherein the bottom plate is composed of a pair of plate-shaped members formed in series in a substantially U-shape through a thin connecting portion. 8. The foam synthetic resin assembly container according to claim 3, wherein the lid plate is composed of a pair of plate-shaped members formed in series in a substantially U-shape through a thin connecting portion. 9. The foam synthetic resin assembly container according to claim 3, 4 or 5, wherein a plurality of plate members are connected to each other to form a side plate of the container body. 10. The foamed synthetic resin assembly container according to claim 9, wherein two sets of container bodies are vertically stacked so that their openings are abutted against each other. 11. The foamed synthetic resin assembled container according to claim 10, wherein the bottom plate of the container main body located in the upper position of the two sets of container main bodies that are stacked is used as a cover plate. 12. The foamed synthetic resin assembly container according to claim 10 or 11, further comprising another plate-shaped member connected between the side plates of the two sets of container bodies that are stacked. 13. A method of manufacturing an assembled container, which comprises assembling a plurality of plate-shaped members molded in-mold with a foamable thermoplastic resin by inserting them into each other and assembling them, wherein two plate-shaped members are connected via a thin connecting portion. A method for manufacturing an assembled container made of expanded synthetic resin, characterized in that both plate-shaped members are cut at the connecting portion after being formed into a substantially U-shape in series. 14. A cavity mold and a core mold that is provided so as to be insertable into and removable from the cavity mold so that a pair of plate-shaped molding spaces extends in the mold opening direction of both molds. Forming a space having a substantially U-shaped cross-section formed by communicating narrow spaces between the molding spaces, filling the substantially U-shaped molding space with expandable thermoplastic resin particles, and heat-foaming the same. 14. The method for manufacturing an expanded synthetic resin assembly container according to claim 13, wherein the pair of plate-shaped members are molded in series through a thin connecting portion.