JPH02292011A - Manufacture of box of double bottom having network top therefor - Google Patents

Abstract

PURPOSE:To integrally mold a box of the double bottom having a network upper bottom wall by forming networks in the upper bottom wall of the box having the double bottom and connecting the thin band plates provided between the networks to a lower bottom wall by connecting pieces and providing the enlarged parts at every network in a top force selected from the top and bottom forces which mold the space between the upper and lower both bottom walls and drawing off the enlarged parts from the networks by the support of the connecting pieces. CONSTITUTION:In a box B having a double bottom, a lower bottom wall 3 is provided successively to the lower end of a side wall 1 and an upper bottom wall 2 is supported in a middle part. The networks 5, 5 are provided in the upper bottom wall 2. A mold for injection-molding the box B is formed of a top force 20 and a bottom force 21. A face 22 for forming the top face of the upper bottom wall 2 is formed in the top force 20. The projections 23 forming the networks 5 are formed in the face 22 and the enlarged parts 24 for molding the spaces 8 are formed in the projections 23. The space parts 25 for forming the connecting pieces 7 are provided between the enlarged parts 24. The grooves 26 for forming the side end pieces 6a of a thin band plate 6 are provided between the lower face 22 of the top force main body 2A and the enlarged parts 24. The respective corners of the enlarged parts 24 are provided with the fine pieces 27 for closing the grooves 26 which are utilized as formation of the notched grooves 9. Mold drawing off is performed by drawing off the enlarged parts 24 of the top force 2 from the networks 5. The side end pieces 6a are turned up and the mold drawing of the enlarged parts 24 is performed by elastic deformation of the side end pieces 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for integrally molding a double-bottomed box from plastic, in which two of the two lower and upper bottom walls are mesh-shaped.

[Conventional technology]

If the box has a double-bottom top wall with a net shape that is suitable for draining water, even if watery food is placed inside the box, the water will be drained and the appropriate amount of moisture can be stored, making it convenient for transporting food. It is. For example, as a means of preserving the freshness of firefly squids caught in Toyama Bay over long distances, they are landed on the beach, boiled in a pot at the same time, and then scooped from the pot in a colander and transported directly into boxes. However, since the boiled firefly squid is impregnated with water from the boiling water, the water leached from the firefly squid accumulates inside the box, and this water causes a decrease in the freshness and +17 quality of the firefly squid. If water is drained during transportation in boxes, the market value of fireflies can be enhanced.

Traditionally, the bottom of the box was lined with slats, but this was separate from the box and inconvenient to handle. If so, it is very convenient.

[Problem to be solved by the invention]

However, the integral molding of double bottoms has not been done in the past because it is impossible to create a space between them, and when forming a double bottom, a method is used to assemble a pair of upper and lower boxes one on top of the other. was. However, this has the problem of high costs due to the molding and assembly of two boxes.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for integrally molding a double-bottomed box having a net-like upper bottom wall.

[Means to solve the problem]

In order to achieve the above object, the inventors conducted various studies and found that when a connecting piece is provided between the upper and lower bottom walls without creating a complete space between the upper and lower bottom walls, the space between the upper and lower bottom walls is They discovered that it is possible to perform die cutting, and completed this invention.

That is, in injection molding a double-bottomed box with plastic, the present invention forms a mesh on the upper bottom wall of the double-bottomed box,
To form the space between the upper and lower bottom walls by connecting the thin strip plate between the meshes that make up the upper bottom wall to the lower bottom wall with a connecting piece, an enlarged part is provided for each mesh in the upper mold of the upper and lower molds. , the gist thereof is to extract the enlarged portion from the mesh by supporting the connecting pieces.

[For production]

According to the above configuration, the space between the upper bottom wall and the lower bottom wall is formed 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 the plastic, but the connecting piece pulls the top bottom wall against the pulling force, so the top bottom wall does not lift up and is kept in a horizontal state. Remove the enlarged part from the mesh and insert a v between the upper and lower bottom walls.
A desired space through which I[1 can escape can be formed.

〔Example〕

Next, this invention will be explained based on drawings showing examples. Figures 1 to 4 show one embodiment. First,
The structure of the double-bottomed box B will be explained.

The double-bottom box B has a lower bottom wall 3 connected to the lower end of the side wall 1, an upper bottom wall 2 supported at the middle of the height, and a rectangular mesh 5 arranged in the longitudinal direction on the upper bottom wall 2. 5,... are provided. Therefore, the upper bottom wall 2 is constituted by thin strip plates 6 and 6. A connecting piece 7 is provided between the upper and lower bottom walls 2 and 3 in the form of a partition wall, and the connecting piece 7 is formed along the center of the width 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 ↓ is a thin strip plate 6 on both sides.
The side end pieces 6a, 6a protrude like a flange.

The side end piece 6a of the thin strip plate 6 has a draft angle by slanting the lower surface 10 (Fig. 3), and in order to make it easier to warp up during die cutting, a side end piece 6a is provided at each corner of the mesh 5. A notch groove 9 is formed in which the end piece 6a is chipped.

Further, a flange portion 12 that is inverted and bent outward is formed at the upper end of the side wall 1, and a seat piece l3 that hangs on the inside of the flange portion l2 is formed on the outer peripheral edge of the lower base Ii3. It is designed to be able to accumulate high and stably.

The molds for injection molding the box B above are an upper mold 20 and a lower mold 21.
A surface 22 forming the upper surface of the upper base ri2 is formed on the upper mold 20, and a protrusion 23 forming the mesh 5 is formed on the surface 22, and a space 8 is formed in the protrusion 2: An enlarged portion 24 is formed continuously.

A space 25 forming a connecting piece 7 is provided between the enlarged parts 24, and a lower part 2 of the upper mold body 2A is provided.
2 and the enlarged part 24 have a groove 26 for forming the side end piece 6a of the thin strip plate 6 (FIG. 4). Its i+'l26
It has a strip 27 closing it.

To perform die cutting, it is necessary to pull out the enlarged part 24 of the upper mold 2 from the narrower mesh 5, and since the enlarged part 24 is hanging on the side end piece 6a of the thin strip plate 6, the force required to pull it out is reduced. This will exert a lifting action on the side end piece 6a, but since it is pulled in the opposite direction by the connecting piece 7, the side end piece 6a will be turned up by this action, and the elastic deformation of this side end piece 6a will cause the enlarged portion 2ll to expand. The mold is cut out.

Regarding the resistance to die cutting, as the protruding dimension of the side end piece 6a of the thin strip plate 6 becomes shorter and thinner, die cutting becomes easier, and when the connecting piece 7 is thicker, die cutting becomes easier. becomes.

When a watery food such as boiled firefly squid is placed in the double-bottomed box B manufactured as described above, it is received by the mesh-like upper bottom wall 2, so that the water leached from the food flows through the mesh 5. The water falls into the space 8 below and collects there, and since the collected water does not come into contact with the food, the food can be transported over long distances without losing its freshness and retaining its flavor.

Furthermore, since there is no drainage hole leading to the outside, dust does not enter through the drainage hole, making it sanitary.

Furthermore, another way to use it is to fill each space 8 with about half of the water, freeze it in the refrigerator, and then put seafood or meat in the box B.
When fresh foods such as vegetables are placed, the freshness and quality of the food can be effectively maintained by keeping the temperature close to 0°C. Even if the box B shakes during transportation when the ice melts, each space 8 is independent, so there is no large wave caused by the shaking of the water, and the small partitioned space 8 Only small waves are generated, so as long as the water level is suitable for ice formation, the food will not be submerged.

[Other Examples]

Figures 5 to 7 show other embodiments, and the structure of the double-bottomed box B has a square mesh on the upper bottom wall 2 of the lower bottom walls 2 and 3. 5a, 5c, . . . are provided, which is the same as in the previous embodiment, but the connecting piece 7 between the upper and lower bottom walls 2, 3 is formed in the shape of a column, and the longitudinal and longitudinal thin strip plates 6
, 6 intersect with each other, column-like connecting pieces 7, 7, .

Therefore, in this case, a particularly large amount of water does not accumulate in the - part of the space 8, and the water level becomes uniform throughout.

The molds for injection molding the box B above are an upper mold 20 and a lower mold 21.
The upper mold 20 consists of one first mold 20,),
One second mold 20b and multiple third molds 200, 20c
,..., the first type 20a and the second type 20a.
Surfaces 22a and 22b forming the upper surface of the upper bottom wall 2 on the mold 20b
has been formed.

The first mold 20a has a structure that is directly assembled with the lower mold 21, so it is a basic mold of the upper mold 20, and the surface 20a is a basic mold of the upper mold 20.
Protrusions 23a are provided protrudingly so as to form meshes 5 at every other warp and warp, and enlarged portions 24a are formed at the tips of each protrusions 23a.

Therefore, the first mold 20a is provided with punch holes 30, 30, . . . for every other remaining mesh 5, and the second
The mold 20b has a hole 30. 30,... Hill bottom wall 2
Auxiliary pieces 3l, 3l, . Hole 32. 3
The third molds 20c, 20c, . . . are fitted in the 2, .

The third type 20c includes the remaining every other mesh 5c,
5c, . . . , and an enlarged portion 24c that forms a space 8 for each mesh 5c is continuously formed at the lower end. Further, the upper end portion of the third mold 20c protrudes above the upper surface of the second mold 20b, and a flange portion 35 is formed at the tip of the protrusion.

When cutting the mold, first, the second mold 20b of the upper mold 20 is lifted as shown by the arrow in FIG. Then, the second mold 20b is caught on the flange 35 and lifts the third mold 20c, so that both the second mold 20b and the third mold 20C are pulled out, and finally the first mold 20a is pulled out. Then, when the second mold 20c is pulled out, a space is created at the part S where the lower end of the auxiliary piece 3l is pulled out, and the side end piece 6a of the thin strip plate 6 is warped up in that space, so that the third mold 20a is formed. This makes it easy to remove.

〔Effect of the invention〕

As explained above, according to the present invention, in forming the space between the upper and lower bottom walls, an enlarged part is provided for each mesh in the upper mold of the upper and lower molds, and the enlarged part is formed from the mesh by supporting the connecting piece. When the enlarged part is removed, the upper bottom wall is pulled by the connecting piece against the removal.
The top bottom wall does not lift up and the enlarged part is easily pulled out and remains horizontal, making it possible to integrally mold a double-bottomed box with a net-like top wall from plastic, allowing the two boxes to be combined. Unlike the case of configuring a double bottom, it has the excellent effect of being suitable for mass production and being able to be provided at low cost.

Furthermore, the manufactured double-bottomed box is durable because it is integrally molded, and also has the advantage of having a good appearance without any seams.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment, Figure 1 is a partially cutaway perspective view of the box, Figure 2 is a partial plan view, and Figure 3 is a partial cross section of the mold showing the molding state. FIG. 4 is a perspective view showing a part of the upper mold in cross section. Figures 5 to 7 show other embodiments, Figure 5 is a perspective view showing a cross section of a part of the box, Figure 6 is a partial plan view, and Figure 7 is a mold showing the molding state. It is a partially sectional view. B...Double-bottom box with a net-like upper bottom wall 2...Upper bottom wall 3...Lower bottom wall 5, 5a, 5c...Mesh 6 7...Connection piece 8...Space 24, 24a, 24c... Enlarged part... Thin strip plate

Claims (1)

[Claims] 1) Regarding injection molding of a double-bottomed box with plastic, a mesh is formed on the top wall of the double bottom, and the thin strip plate between the meshes forming the top bottom wall is connected to the bottom wall with a connecting piece. , for molding the space between the upper and lower bottom walls, the upper and lower molds have an enlarged portion for each mesh in the upper mold, and the upper bottom wall is characterized in that the enlarged portion is extracted from the mesh by the support of the connecting piece. A method of manufacturing a double bottom box that is reticulated.