JPH0626832B2 - Method for manufacturing double-bottomed box having a net-like top-bottom wall - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for integrally molding a double-bottomed box, in which upper and lower bottom walls are net-like, of both upper and lower bottom walls with plastic.

[Conventional technology]

If the double-bottomed upper and lower walls are a mesh box suitable for draining, even if you put watery food in the box, it will be drained and can be stored in an appropriate amount of moisture, so it is convenient for food transportation. Is. For example, squid caught in Toyama Bay is landed on the beach and boiled in a kettle at the same time as a means of keeping freshness over a long distance, and the squid picked from the kettle is transferred directly to a box. However, since the water from boiling water is impregnated in the boiled squid, the water leached from the squid accumulates in the box, which causes the freshness and quality of the boiled squid to deteriorate. If it is drained during transportation, it can enhance the market evaluation of squid.

Traditionally, it used to be slats on the bottom of the box, but since it is separate from the box and is inconvenient to handle, if the double-bottomed top and bottom walls are reticulated, It is very convenient.

[Problems to be Solved by the Invention]

However, the integral molding of the double bottom has not been conventionally done because it is impossible to form a space between them, and when forming the double bottom, a method of assembling by stacking a pair of upper and lower boxes is adopted. Was there. However, this has a problem that the cost is inevitably increased due to the molding and assembly of the two boxes.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method capable of integrally forming a double-bottomed box having a net-like upper bottom wall.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the inventors of the present invention have conducted various studies and found that the space between the upper and lower bottom walls does not become a complete space between the upper and lower bottom walls when a connecting piece is provided between them. As a result, they have found that they can be die-cut, and have completed the present invention.

That is, the present invention relates to injection-molding a double-bottomed box with plastic by forming a mesh on the upper-bottom wall of the double-bottomed box,
About connecting the thin strip plate between the meshes forming the upper bottom wall to the lower bottom wall with a connecting piece to form the space between the upper and lower bottom walls, the upper mold of the upper and lower molds is provided with an enlarged portion for each mesh The gist of the invention is to extract the enlarged portion from the mesh by supporting the connecting piece.

[Work]

According to the above configuration, the space between the upper bottom wall and the lower bottom wall is molded by the enlarged portion formed for each mesh in the upper mold,
It is necessary to pull out the enlarged part from the mesh using the elasticity of plastic, but since the connecting piece pulls the upper bottom wall against the pulling force, the upper bottom wall does not lift and the upper bottom wall is kept horizontal As it is, it is possible to remove the enlarged portion from the mesh to form a desired space between the upper and lower bottom walls through which the mesh exits.

〔Example〕

Next, the present invention will be described based on the drawings described in the embodiments.

FIGS. 1 to 4 show an embodiment, and first,
The structure of the double-bottomed box B will be described.

In the double-bottomed box B, a lower bottom wall 3 is continuously provided at a lower end of a side wall 1, an upper bottom wall 2 is supported at a middle portion of a height, and a rectangular mesh 5 is arranged on the upper bottom wall 2 in a longitudinal arrangement. 5 are provided. Therefore,
The upper bottom wall 2 is constituted by thin strip plates 6 and 6 of the weft. A connecting piece 7 is provided between the upper and lower bottom walls 2 and 3 in a partition net shape, and the connecting piece 7 is formed along the width center of the thin strip plate 6. Therefore, the space 8 between the upper and lower bottom walls 2 and 3 is independent for each mesh 5, and the upper end of the connecting piece 7 has side end pieces 6a, 6a of the thin strip plate 6 protruding in a brim shape on both sides. .

The side end pieces 6a of the thin strip plate 6 have a draft angle by inclining the lower surface 10 (Fig. 3). A notch groove 9 is formed in which the end piece 6a is chipped.

In addition, a flange 12 is formed at the upper end of the side wall 1 so as to be inverted and refracted outward, and a seat piece hanging on the inside of the flange 12 is provided at the outer peripheral edge of the lower bottom wall 3.
13 is formed so that the boxes B can be stacked with high stability.

The mold for injection-molding the box B is composed of an upper mold 20 and a lower mold 21, of which a surface 22 forming the upper surface of the upper bottom wall 2 is formed on the upper mold 20 and a mesh is further formed on the surface 22. Protrusion forming 5
23 is formed, and an enlarged portion 24 for forming the space 8 is continuously formed on the protrusion 23.

A space 25 that forms the connecting piece 7 is provided between the enlarged portions 24, and the thin strip plate 6 is provided between the lower surface 22 of the upper mold body 2A and the enlarged portion 24. It has a groove 26 which forms the end piece 6a (FIG. 4), but at each corner of the enlarged part 24 has a strip 27 which closes the groove 26 for forming the notch groove 9.

In order to remove the die, it is necessary to remove the enlarged portion 24 of the upper die 2 from the mesh 5 which is narrower than the enlarged portion 24. Since the enlarged portion 24 is hooked on the side end piece 6a of the thin strip plate 6, the pulling force is large. However, since the connecting piece 7 pulls the side end piece 6a in the opposite direction, the side end piece 6a is flipped up by the action, and the elastic deformation of the side end piece 6a causes the enlarged portion to expand.
24 die-cuts are made.

Regarding the resistance of the die cutting, the die cutting becomes easier as the protruding dimension of the side end piece 6a of the thin strip plate 6 becomes shorter and thinner, and the die cutting becomes easier even when the connecting piece 7 has a large thickness. Becomes

When a watery food such as boiled mulberry squid is put in the double-bottomed box B manufactured as described above, it is received by the net-like upper bottom wall 2, so that the water leached from the food comes from the mesh 5 Since it falls into the lower space 8 and collects there, and the collected water does not touch the food, the food can be transported over a long distance without sacrificing the freshness of the food.

Further, since there is no water drainage hole communicating with the outside, dust does not enter through the water drainage hole, which is hygienic.

Furthermore, as another usage, about half the water is put in each space 8 and frozen in the refrigerator, and then the seafood and meat are put in the box B.
When fresh foods such as vegetables are added, the freshness and quality of the foods can be effectively maintained at an appropriate temperature close to 0 ° C.
Even if the box B shakes when the ice melts during transportation, since each space 8 is independent, a large wave is not generated due to the rocking of water, and the space is small in the partitioned space 8. The food is not submerged in water as long as the ice level is adequate, as only small waves are generated.

[Other Examples]

FIGS. 5 to 7 show another embodiment. Regarding the structure of the box B having a double bottom, the upper bottom wall 2 of the upper and lower bottom walls 2 and 3 has a square mesh 5a, 5c, ... Are provided in the same manner as in the above embodiment, but the upper and lower bottom walls 2, 3 are provided.
The connecting piece 7 between them is formed in a pillar shape, and the pillar-shaped connecting pieces 7, 7 ... Are erected at each position where the thin and parallel thin strip plates 6, 6 intersect, so that the space between the upper and lower bottom walls 2, 3 is formed. 8 communicates with the entire box.

Therefore, in this case, a large amount of water does not collect in a part of the space 8, and the water level becomes uniform as a whole.

The mold for injection-molding the box B is composed of an upper mold 20 and a lower mold 21, and the upper mold 20 has one first mold 20a and one second mold.
It is composed of a combination of a mold 20b and a large number of third molds 20c, 20c, ..., And the first mold 20a and the second mold 20b are provided with surfaces 22a, 22b forming the upper surface of the upper bottom wall 2. .

Since the first die 20a has a structure directly assembled with the lower die 21, it is a basic die of the upper die 20, and the protrusions 23a are formed on the surface 22 so as to form the mesh 5 at every other history. And an enlarged portion 24a is formed at the tip of each protrusion 23a.

Therefore, the first die 20a is provided with perforations 30, 30, ... For every other remaining mesh 5, and the second die 20b has perforations 30, 30 ,. , Projecting auxiliary pieces 31, 31, ..., and through holes 32, 32, ... passing therethrough for each auxiliary piece 31, 31, ... are formed, and the through holes 32,
The third molds 20c, 20c, ... Are fitted in 32 ,.

The third mold 20c is composed of the remaining meshes 5c and 5c.
., and an enlarged portion 24c for forming the space 8 for each mesh 5c is continuously formed at the lower end. Also,
The upper end of the third die 20c projects above the upper surface of the second die 20b, and a flange 35 is formed at the tip of the projection.

When removing the mold, first, the second mold 20 of the upper mold 20.
Lift b as shown by the arrow in FIG. Then, the second type
Since 20b is hooked on the flange 35 and lifts the third die 20c, the second die 20b and the third die 20c are pulled out together, so that the first die 20a is finally pulled out. When the second die 20c is pulled out, the portion S at the lower end of the auxiliary piece 31 is pulled out.
Since a space is generated in the space, and the side end piece 6a of the thin strip plate 6 warps in the space, the third die 20c can be easily demolded.

〔The invention's effect〕

As described above, according to the present invention, in forming the space between the upper and lower bottom walls, the upper die of the upper and lower molds is provided with an enlarged portion for each mesh, and the enlarged portion is formed from the mesh by supporting the connecting piece. Since the upper bottom wall is pulled against the extraction by the connecting piece when the enlarged portion is extracted,
Since the upper bottom wall does not lift up and the expanded part is easily pulled out and keeps the horizontal state, it is possible to integrally form a double bottom box with a net-like upper bottom wall with plastic, combining two boxes Unlike the case of forming a double bottom, there is an excellent effect that it is suitable for mass production and can be provided at low cost.

Further, the manufactured double-bottomed box is strong because it is integrally molded, and there is also an effect that the box is seamless and has a good appearance.

[Brief description of drawings]

1 to 4 show one embodiment, FIG. 1 is a partially cutaway perspective view of a box, FIG. 2 is a partial plan view, and FIG. 3 is a partial cross section of a mold showing a molding state. FIG. 4 and FIG. 4 are perspective views showing a part of the upper die in cross section. 5 to 7 show another embodiment, FIG. 5 is a perspective view showing a part of the box in cross section, FIG. 6 is a partial plan view, and FIG. 7 is a mold showing a molding state. FIG. B: a double-bottomed box whose upper bottom wall is reticulated 2 ... upper bottom wall 3, ... lower bottom wall 5, 5a, 5c ... mesh, 6 ... thin strip 7 ... connecting piece, 8 …… Space 24, 24a, 24c …… Expansion part

Claims (1)

[Claims] 1. When a double-bottomed box is injection-molded with plastic, a mesh is formed on the upper bottom wall of the double bottom, and a thin strip plate between the meshes constituting the upper bottom wall is connected to the lower bottom wall. When forming a space between the upper and lower bottom walls by connecting with each other, the upper die of the upper and lower dies is provided with an enlarged portion for each mesh, and the enlarged portion is extracted from the mesh by supporting the connecting piece. A method for manufacturing a double-bottomed box whose bottom wall is reticulated.