JP3022621B2 - Foam synthetic resin assembly box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam synthetic resin assembly box which can be developed into a flat plate shape.

[0002]

2. Description of the Related Art Conventionally, as an assembly box made of a foamed synthetic resin of this kind, as shown in FIG.
(Japanese Patent Laid-Open No. 1-2790)
No. 46). The box body 1 has a side plate 3 standing upright around a bottom plate 5 via a notch hinge portion 4, and the notch hinge portion 4 has a notch 6 having a predetermined depth inside the bottom plate 5 on an inner surface extension of the side plate 3. It is formed in. The notch hinge portion 4 allows the side plate 3 to be developed into a flat plate as shown in FIG. 11, which facilitates storage and transportation of the box body 1 in an empty state. In the assembly box having the above structure, the box body 1 is formed in a three-dimensional shape by a mold, and the cover plate 2 is formed by a separate mold.

[0003]

However, the above-mentioned conventional assembly box requires two sets of dies because the box body 1 and the cover plate 2 are separately formed, which not only complicates the manufacturing process but also complicates the manufacturing process. ,
Naturally, there was a problem that costs would rise. In addition, maintenance has to be performed for two sets of molds, and also in terms of product management, it has to be performed for both the box body and the cover plate, which is extremely troublesome. The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an assembling box in which a box body and a cover plate can be integrally formed.

[0004]

In order to achieve the above object, the foam synthetic resin assembly box of the present invention has at least one lid plate on the box body, and the box body has a side plate with a notch hinge portion. The lid plate is erected around the bottom plate, and one side of the lid plate is connected to the upper side of the side plate of the box body via a notch hinge portion in a horizontally opened state, and the notch hinge portion of the box body has a predetermined depth. The notch is formed on an extension of the inner surface of the side plate inside the bottom plate, and the notch hinge portion of the lid plate is formed such that a notch of a predetermined depth is formed on the extension of the outer surface of the side plate inside the lid plate.

It is preferable that a notch hinge reinforcing portion is formed in the notch hinge portion of the box body on a plate surface opposite to the notch of the bottom plate.

[0006]

The assembly box having the above construction is connected to a box body having a side plate erected around the bottom plate in a state where one side of the lid plate is horizontally opened to the upper side of the side plate of the box body. By providing a mold cavity having a concave cross section, the box body and the cover plate can be integrally formed. When the notch hinge reinforcing portion is formed, the notch hinge portion of the box main body is strengthened, and the durability of the assembling box is improved, and a heavy object can be stored.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 to 6, but it goes without saying that these do not limit the present invention in any way. As shown in FIG. 1, the assembling box of this embodiment is made of a foamed synthetic resin, and includes a box body 11 and a pair of left and right lid plates 12. As the foam synthetic resin, a polystyrene resin, a polyolefin resin such as polyethylene or polypropylene, a polyurethane resin, or the like is suitably used. The box body 11 has a side plate 13 erected around a bottom plate 15 via a notch hinge portion 14, and a lid plate 12.
Is connected to the upper side of the side plate 13 in a horizontally opened state, with one side being opened through a notch hinge portion 16 as shown in the figure. Further, the notch hinge portion 14 has a notch 17 having a predetermined depth formed on the inner surface extension of the side plate 13 inside the bottom plate 15, and the notch hinge portion 16 has a notch 18 having a predetermined depth formed inside the cover plate 12. It is formed on an outer surface extension of the side plate 13. The thickness of the notch hinge portions 14 and 16 is set in consideration of the size of the assembly box, the type of resin, the expansion ratio, the presence or absence of a skin layer, and the like.
It is preferable to set it to about several mm.

In order to manufacture the assembly box having the above structure, first, as shown in FIG. 2, a mold 21 is provided with a mold cavity 22 which can be integrally formed with the assembly box. The mold 21 includes a pair of core molds 23 and a cavity mold 24. The cavity mold 24 includes a plurality of resin bead fillers 25. Is open. Mold cavity 2
2 has a concave cross-sectional shape, has a side plate forming part 28 around a bottom plate forming part 27, and a pair of lid plate forming parts 29 is connected to opposing sides of the side plate forming part 28. And the side plate forming part 2
A notch forming plate 30 is provided on the inner surface of the bottom plate 8 so as to protrude into the bottom plate forming portion 27 by the depth of the notch 17, and a notch forming plate 31 is formed on the outer surface of the side plate forming portion 28 in the cover plate forming portion 29. It is provided so as to protrude by the depth. These notch forming plates 30 and 31 form notches 17 and 18 and the adjacent side plates 1
It is used to separate 3 and is made from Shinchu, gunmetal and the like. Next, the foaming resin beads 32 are filled into the mold cavity 22 from the filling device 25, and steam is supplied from the steam holes 26 to the mold cavity 22.
After being supplied and heated and molded, the molded product is taken out by cooling. Thus, the assembly box having the shape shown in FIG. 1 can be integrally formed.

As shown in FIG. 3, the assembled box obtained as described above can be developed in a plane through the notch hinges 14, 16, so that a plurality of assembled boxes can be stored or transported. Therefore, a large storage space is not required,
Also, the transportation efficiency is good. In addition, adjacent side plates 13
When the joints of the two are formed into a so-called joint structure as illustrated in FIGS. 4 to 6 or the joint between the cover plates 12 is formed as a joint as illustrated in FIG. The strength of the assembly box is improved.

As another embodiment of the present invention, as shown in FIG. 7, a notch hinge reinforcing portion (hereinafter referred to as a reinforcing portion) 19 may be formed on a plate surface of the bottom plate 15 opposite to the notch 17. The necessity of the reinforcing portion 19 is determined by the type of the resin used for the assembly box, the weight of the contents, and the like.
In the case of a polyolefin resin, the reinforcing portion 19 is often unnecessary because of having excellent bending strength and the like. In the case of a polystyrene resin, it is often preferable to provide the reinforcing portion 19. It is preferable to use a material of the same quality as the material of the assembly box, an olefin / styrene copolymer resin, or the like.

In order to manufacture an assembly box provided with the reinforcing portion 19, as shown in FIG. 8, a reinforcing portion is formed on the opposite side of the cut forming plate 30 in the bottom plate forming portion 27 in the mold cavity 22 of the embodiment. A concave portion 33 is provided. And the filling device 25
The foamed resin beads 32 are filled into the mold cavity 22 from above, and steam is supplied into the mold cavity 22 from the steam holes 26 to perform heating and temporary fusion. Temporary fusing means that the foamed resin beads 32 are spread to the extent that the temporarily fused material is not collapsed by the opening of the mold, and so that water vapor penetrates into the interior during the main fusion in which the reinforcing portion 19 to be described later is fusion-formed. Refers to a state in which a gap exists. The conditions for the temporary fusion are determined by the type of the resin, the thickness of the molded body, and the like.
While heating at low pressure to normal pressure of 2kg / cm ² ~0.4kg / cm ² is preferred. Next, if necessary, light cooling is performed, and then a minute gap (for the thickness of the reinforcing portion 19) is opened, and a foaming resin bead 34 for the reinforcing portion is filled in the concave portion 33 from a filler (not shown) provided in the concave portion 33. After filling in, the mold is closed and fused.
The reinforcing portion 19 is integrated with the bottom plate 15. Thus, FIG.
Can be integrally formed. At the time of the temporary fusion, a small amount of the foamable resin bead 32 also enters the recess 33 and is temporarily fused, and then the minute gap is opened to fill the foamable resin bead 34 for the reinforcing portion. Then, the main fusion is performed, so that the reinforcing portion 19 and the bottom plate 15 in the vicinity thereof are subjected to a kind of compression molding, so that the flexibility is increased and the notch hinge portion 14 has a suitable property.

The reinforcing portion 19 can be further reinforced. For example, a box for heavy goods can be made by attaching a film or the like to the notch hinge portion 14 corresponding to the reinforcing portion 19 and integrally forming the film. As the film (or sheet) used at this time, the same or similar material as the material used for forming the box is preferable because of good fusion property at the time of molding. For example, if the box is made of polystyrene,
It is preferable to use a film made of high impact polystyrene. Of course, it is needless to say that different kinds of materials can be used as long as they can adhere to each other. Although the double-sided cover plate has been described above, the present invention can be applied to a single-sided cover plate.

[0013]

As described above, according to the present invention, the box body has the side plate erected around the bottom through the notch hinge portion, and the lid plate has one side cut through the notch hinge portion. Since it is configured to be connected to the upper side while being opened horizontally, the box main body and the lid plate can be integrally formed. Therefore, only one mold is required, and the working efficiency is greatly improved, and the cost is reduced. Further, since only one mold is required and the product is integrally formed, maintenance of the mold and inventory management of the product are easy. In addition, since the assembly box can be unfolded in a plane through the notch hinge portion, a plurality of stacked boxes are stored or transported, so that the storage space can be narrowed and the transport efficiency is good. Further, when the notch hinge reinforcing portion is formed on the bottom plate, the notch hinge portion of the box main body is strengthened, and the durability of the assembled box is improved, and a heavy object can be accommodated.

[Brief description of the drawings]

FIG. 1 is a sectional view of an assembly box showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the assembly box manufacturing apparatus shown in FIG.

FIG. 3 is a development view of the assembly box shown in FIG. 1;

FIG. 4 is a sectional view showing an example of a joint structure of side plates in an assembly box.

FIG. 5 is a sectional view showing an example of a joint structure of side plates in an assembly box.

FIG. 6 is a sectional view showing an example of a joint structure of side plates in an assembly box.

FIG. 7 is a sectional view of an assembly box showing another embodiment of the present invention.

8 is a cross-sectional view of the assembly box manufacturing apparatus shown in FIG.

FIG. 9 is a development view of the assembly box shown in FIG. 7;

FIG. 10 is a sectional view showing an example of a conventional assembly box.

11 is an exploded view of the conventional assembly box (box body) shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Box main body 12 Lid plate 13 Side plate 14 Cut-in hinge part (box main body side) 15 Bottom plate 16 Cut-in hinge part (lid plate side) 17 Cut-in (box main body side) 18 Cut-in (lid plate side) 19 Cut-in hinge reinforcement part 21 Mold Reference Signs List 22 mold cavity 27 bottom plate forming part 28 side plate forming part 29 cover plate forming part 30 cut forming plate (box body side) 31 cut forming plate (lid plate side) 32 foamable resin beads 33 recess 34 foamable resin beads for reinforcing part

Claims (2)

(57) [Claims] The box body has at least one lid plate, the box body has a side plate erected around a bottom plate via a notch hinge portion, and the lid plate has one side cut through the notch hinge portion to form the box body. It is connected to the upper side of the side plate in the state opened horizontally,
The notch hinge portion of the box body has a notch of a predetermined depth formed on an extension of a side plate inner surface inside the bottom plate, and the notch hinge portion of the lid plate has a notch of a predetermined depth formed on an extension of a side plate outer surface inside the lid plate. Assembled box made of foam synthetic resin. 2. The foam synthetic resin assembly box according to claim 1, wherein a notch hinge reinforcing portion is formed on a plate surface opposite to the notch in the bottom plate.