JPH01279046A - Foamed synthetic resin setup box and its manufacture - Google Patents

Abstract

PURPOSE:To provide a setup box inexpensive to produce, excellent in durability and capable of receiving the heavy content, by providing hinge receiving parts on the bottom thereof vertically to an extension from the inner surface of the side wall thereof. CONSTITUTION:A cavity with a recess-shaped cross section of a bottom 1 and side walls 2 installed around it is formed by setting a metal core die 11 and a metal cavity die 12 and a hinge forming plate 13 is extended from a hinge receiving part of the inside of the side wall of the metal core die 12. Said plate 13, formed of brass or gunmetal, is for separating the side wall of the container body adjacent thereto and for notching from the inside leaving a sufficient thickness to allow the outside of the bottom to function as a hinge part. In the aforesaid device, foamed resin beads 16 are filled in the cavity through a filling device 14 and, after heating and molding the same with steam, cooled and taken out of the dies so as to obtain a molded container body. While in storage or transit, a lid is separated from the container body which is folded into a sheet form with the side walls thereof brought down via the hinge receiving part.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an assembly box made of foamed synthetic resin and a method for manufacturing the same, and more particularly, the present invention relates to an assembly box made of foamed synthetic resin and a method for manufacturing the same, and more specifically, an assembly box made of foamed synthetic resin and a method for manufacturing the same. The present invention relates to a foamed synthetic resin assembly box that can be assembled and a method for manufacturing the same.

[Conventional technology]

Conventionally, this type of assembly box has been molded using foamed styrene resin with the side wall (2) unfolded into a flat shape as shown in FIG. 11, and as shown in FIGS. 12 and 13.
When in use, it is assembled into a box via the V-shaped notch hinge (3) and ready for use. Note that the lid is omitted in the above description.

[Problem to be solved by the invention]

However, an assembled box with such a structure has two drawbacks: (1) the strength of the notch hinge is weak and cannot accommodate heavy contents; (2) the notch hinge is located in a part of the corner of the box;
Abrasion and damage due to contact with other objects, collisions, etc. will occur, reducing the strength of the hinge part and reducing the durability of the assembled box. ■The number of molds is small because it is molded in a flat state. Therefore, there are problems such as an increase in costs.

(Means for Solving the Problems) In view of the above circumstances, the present inventors have conducted extensive research to solve the above problems, and as a result, have arrived at the present invention.

That is, the first aspect of the present invention is an assembly box made of foamed synthetic resin, which is composed of a bottom part and a side wall part erected around the bottom part via a notch hinge part, in which the notch hinge part is located inside the side wall part. The second aspect of the present invention is that the foamed synthetic resin assembly box is provided at the bottom perpendicularly on the extension line of the surface, and the core mold (11) and the cavity mold (
12), a mold cavity with a concave cross section is formed, consisting of a bottom part (1) and a side wall part (2) erected around the bottom part, and a mold cavity is formed in the inner surface forming part of the side wall part of the core mold (1). A cut hinge forming plate (13) is provided protrudingly, and the plate (13) is advanced into the mold cavity constituting the bottom part (1) so as to leave a predetermined thickness of the hinge, and a foamed resin is inserted into the mold cavity. beads(
16), and the third aspect of the present invention is a method for manufacturing a foamed synthetic resin assembly box, characterized in that the bottom part ( 1) and a side wall section (2) erected around it, forming a mold cavity with a concave cross section, and the core mold (11)
A hinge forming plate (13) is cut into the inner surface forming part of the side wall.
) is provided protrudingly, and a hinge reinforcement part (17) is provided on an extension line of the plate (13) in the mold cavity forming the bottom part (1), and the plate (13) forms the bottom part (1). The foamed resin beads (16) are filled into the mold cavity to leave a predetermined hinge thickness, and the foamed resin beads (16) are heated and temporarily fused, and after cooling, the hinge Each content is a method of manufacturing a foamed synthetic resin assembly box characterized by filling the reinforcing part (17) with foamed resin beads for the reinforcing part, then closing the mold, and heating it for final fusion. be.

It should be noted that the assembly box of the present invention can be used not only with the container main body as described above, but also with a lid as required, as described later.

〔Example〕

The present invention will be described based on drawings showing embodiments.

FIG. 1 is a cross-sectional view of the assembly box of the present invention, in which a side wall portion (2) is erected around a bottom portion (1) via a notched hinge portion (3) to constitute a container body.

(4) is a lid body. The cut hinge portion (3) is provided on the bottom portion (1) perpendicularly to the extension line of the inner surface of the side wall portion (2).

One of the features of the assembly box of the present invention is that the container body can be molded into a three-dimensional shape, similar to the molding of ordinary containers.

That is, for example, the container body shown in FIG. 1 can be manufactured using the apparatus shown in FIG. 2. In this device, a core mold (11) and a cavity mold (12) form a mold cavity with a concave cross section consisting of a bottom part (1) and a side wall part (2) erected around the bottom part. Core mold (12)
A hinge forming plate (13) is cut into the inner surface forming part of the side wall.
) is provided protrudingly. The plate (13) is for separating the side walls of adjacent container bodies and making a cut from the inside at the bottom, leaving just enough thickness on the outside to function as a hinge, and is made of wood, gunmetal, etc. It will be done. The thickness of the hinge part cannot be absolutely defined depending on the size of the container, the type of resin, the expansion ratio, the presence or absence of a skin layer, etc., but it is usually suitable to be about 0.5 to several nanometers. (14) is a filling device, and (15) is a steam hole.

In the above apparatus, when the foamable resin beads (16) are filled into the mold cavity through the filling device (14), heated and molded with steam, and then cooled and taken out, the container body shown in FIG. 1 can be obtained. can. FIG. 3 is a schematic diagram of the container body in an expanded state.

(1) is a bottom part, (2) is a side wall part, and (3) is a hinge part. When compared with the developed view of the conventional product shown in FIG. 12, the difference in the hinge part is obvious.

In the present invention, the side wall portion and the notch hinge portion around the bottom are separated by the plate (13), and the joint portion between the side wall portions is a plate similar to the plate for forming the notch hinge portion. , various types of metal holes as shown in FIGS. 4 to 6, for example, can be formed by the shape of the plate (13) to form a desired metal hole structure separated from each other at the joint between the side walls as illustrated later. It can have a different structure. In addition, the above-mentioned joint part is provided with a corner stopper (made of metal, plastic, etc.) as shown in Fig. 7.
5).

In the present invention, there are no restrictions on the shape or structure of the lid;
Inner hook type, outer hook type, and others are used.

When storing or transporting the assembly box of the present invention in a warehouse etc.,
The lid and the container body can be separated, and the container body can be stored or transported in the form of a sheet with the side wall folded down via a notch hinge, that is, in a stacked state as shown in Figure 3, allowing for a large storage space. It is not necessary, and transportation efficiency is also good.

As the foamed synthetic resin used in the present invention, polystyrene resins, polyolefin resins such as polyethylene and polypropylene, polyurethane resins, etc. are used.

FIG. 8 is a sectional view showing another embodiment of the assembly box of the present invention, in which the assembly box has the structure shown in FIG. (6) is provided.

Although it is possible to bond or weld a synthetic resin sheet (or film), a rubber sheet, etc. to the reinforcing portion (6) by post-processing, it is preferable to form the reinforcing portion (6) integrally by two-layer molding.

To provide the reinforcing portion by 2N molding, for example, an apparatus as shown in FIG. 9 can be used.

The device shown in FIG. 9 is the same as the device shown in FIG. 2, except that a hinge reinforcing portion (17) is attached to the outside of the mold cavity on an extension of the notched hinge forming plate (13).

First, as described above, foamable resin beads are filled into the mold cavity through the filling device (14) and temporarily fused by heating with steam. Temporary welding is the process by which gaps are created between the foamed resin beads to the extent that the temporarily welded material does not collapse when the mold is opened, and so that steam can penetrate into the interior during the main fusion process to form the next reinforcing part. In this case, the conditions are the type of resin,
Although it cannot be specified unconditionally depending on the thickness of the molded body, etc., low pressure (
Up to about 0.4 kg/-, more preferably 0.2 kg/c
d) to one-sided heating under normal pressure is preferred.

Next, after cooling slightly if necessary, the mold is opened at minute intervals (corresponding to the thickness of the reinforcing part), and foamed resin beads for the reinforcing part are filled into the filling machine [
Although not shown, the reinforcing part (6) is attached to the bottom part (1) near the hinge part (3) of the container body after filling the mold through the reinforcement part (17), the mold is closed, and the reinforcement part (6) is attached to the bottom part (1) near the hinge part (3). unify,
A container body shown in FIG. 8 is obtained.

FIG. 10 is a developed view of the container body shown in FIG. 8.

In the above method, the hinge reinforcement part (
17) A small amount of foamed resin beads for the container body also enters the interior and is temporarily fused, after which a small gap (for example, the volume inside the hinge reinforcement part is reduced due to the intrusion of the resin beads)
Since the foamed resin beads for the reinforcing part are filled between the molds and then permanently fused, the reinforcing part (6) and the bottom part (1) in the vicinity are compressed into a kind of shape, resulting in increased flexibility. , it has properties suitable for a hinge part.

When the container body is molded, for example, from expanded polystyrene, the resin for the reinforcing portion is preferably a resin that is flexible, has excellent bending strength, and has adhesive properties or mutual affinity with expanded polystyrene. For example, "Piocelan" (trade name, manufactured by Block Plastics Co., Ltd.), which is a copolymer or an impregnated copolymer of styrene and an olefin such as ethylene and is foamable, can be mentioned.

Whether or not to provide a reinforcing part depends on the type of resin used for the container body, the weight of the contents, etc., but polyolefin resins for L boat fishing have excellent bending strength, etc. Therefore, a reinforcing portion is not required in many cases, and in the case of polystyrene resin, it is often preferable to provide a reinforcing plate.

The material for the reinforcing portion is preferably an olefin-styrene copolymer resin or a material made of the same material as the material of the container body, which is molded and then compressed.

[Action/Effect]

As mentioned above, according to the present invention, ■ Since the cut hinge part does not exist in a part of the corner of the box,
Even if a part of the corner is worn or damaged, the strength of the hinge part will not be affected, and the durability will be greatly improved. As mentioned above, the strength of the hinge part will not decrease, so heavy contents can be can be accommodated.

In particular, by providing a reinforcing part as in claim 2, the capacity for storing heavy objects is further increased. ■ Since it is possible to mold a three-dimensional shape like a normal container, a large number of molds can be used. Therefore, the cost of the assembly box
It has many advantages, such as being able to fold down the container, and saving space during storage and transportation because the container body can be stored and transported in a sheet form with the side walls folded down, making it extremely useful. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the assembly box of the present invention, FIG. 2 is a sectional view showing an example of the device, FIG. 3 is a developed view of the container body of the assembly box shown in FIG. 6 to 6 are sectional views of essential parts showing an example of the joining structure between the side walls of the assembly box of the present invention, FIG. 7 is a perspective view showing an example of a corner stopper used in the present invention, and FIG. A sectional view showing another embodiment of the invention assembly box, FIG. 9 is a sectional view showing an example of the device, and FIG. 10 is a sectional view showing an example of the device.
Figures 11 to 13 show a conventional assembly box (container body), Figure 11 is a schematic diagram showing the unfolded state during molding, and Figure 12 is a developed view of the container body of the assembly box shown in the figure. FIG. 11 is an enlarged sectional view taken along the line AA, and FIG. 13 is a sectional view showing the assembled state. DESCRIPTION OF SYMBOLS 1...Bottom part, 2...Side wall part 3...Notch hinge part, 4...Lid body 5...Corner stopper 6...Reinforcement part 11...Core mold, 12
...Cavity mold 13...Notch hinge forming plate, 14...Filler 15...Steam hole,
16...Expansible resin beads 17...Hinge reinforcement part Patent applicant Kanebuchi Chemical Industry Co., Ltd. Figure 9 Figure 1O Figure N

Claims (1)

[Scope of Claims] 1. A foamed synthetic resin assembly box composed of a bottom portion (1) and a side wall portion erected around the bottom portion via a notch hinge portion (3). ) is provided on the bottom part (1) perpendicularly to the extension line of the inner surface of the side wall part (2). 2. The assembly box according to claim 1, further comprising a reinforcing portion (6) provided on the outside of the bottom portion (1) in the vicinity of the cut hinge portion (3). 3. The core mold (11) and the cavity mold (12) form a mold cavity with a concave cross section, consisting of a bottom part (1) and a side wall part (2) erected around the bottom part (1), and Core mold (
1) Cut the hinge forming plate (
13) protrudingly provided, and the plate (13) is attached to the bottom (1).
An assembly box made of foamed synthetic resin, characterized in that the foamed synthetic resin assembly box is inserted into a mold cavity constituting the box so as to leave a predetermined thickness of a hinge, and the mold cavity is filled with foamed resin beads (16) and then heated and molded. Production method. 4. The core mold (11) and the cavity mold (12) form a mold cavity with a concave cross section, consisting of a bottom part (1) and a side wall part (2) erected around the bottom part (1), and Core mold (
A notched hinge forming plate (13) is provided protrudingly on the inner surface forming portion of the side wall portion of the bottom portion (11), and a hinge reinforcing portion (17) is provided on an extension line of the plate (13) in the mold cavity constituting the bottom portion (1).
), the plate (13) is advanced into the mold cavity constituting the bottom part (1) so as to leave a predetermined hinge thickness, and the mold cavity is filled with foamed resin beads (16);
The method is characterized in that the mold is heated to temporarily fuse, and after cooling, the mold is opened at minute intervals, the hinge reinforcing part (17) is filled with foamed resin beads for the reinforcing part, the mold is closed, and the mold is heated to perform the final welding. A method for manufacturing a foamed synthetic resin assembly box.