JPH08337235A - Synthetic resin container - Google Patents

Abstract

PURPOSE: To provide a container made of synthetic resin having partition walls free from deformation. CONSTITUTION: A synthetic resin container 1 exhibiting a rectangle on a plane formed by injection-molding with a gate positioned at a part corresponding to a bottom of the container comprises a bottom 2, an outer wall 3 integrally standing from a periphery of the bottom 2 and integrally equipped with a flange 9 at an upper end, and partition walls 4 for partitioning a space enclosed by the outer wall 3. A lower end of the partition wall 4 integrally continues to the bottom 2, while a side end of the wall 4 integrally continues to the outer wall 3 or another partition wall 4. In addition, an end at a side of the outer wall 3 or a side of another partition wall 4 of the partition wall 4 is made to be a thinner part 5 having a less thickness than other parts of the partition wall 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin container having a partition wall portion for partitioning the inside thereof.

[0002]

2. Description of the Related Art Conventionally, there has been known a flat rectangular container formed by injection molding of synthetic resin, in which a partition wall portion is integrally provided to divide the inside into a plurality of partitions. Conventionally, a synthetic resin container integrally provided with this kind of partition wall has a trace of a gate portion at the bottom.
That is, by arranging the gate portion at an arbitrary position where the bottom portion is formed at the time of molding, injection molding the synthetic resin, filling the outer wall portion, the partition wall portion, and the portion corresponding to the bottom portion with the molten synthetic resin, and then Although it is cooled and hardened, at the time of this cooling and hardening, it shrinks so as to return to the gate portion direction.

Since the gate is located at the bottom,
Curing starts from the outer wall that is farther from the gate, and the partition wall near the gate shrinks and hardens after the outer wall hardens. In this way, the partition wall shrinks (cures) after the outer wall shrinks. Since the part shrinks and hardens, there is no escape of the contraction of the partition wall part, and therefore the partition wall part is deformed in a complicated manner, and the commercial value is reduced.

Although the outer wall portion tends to be deformed inward in an arched shape due to contraction, the corner portion of the outer wall portion functions as a pillar, and the outer wall portion is provided with a flange portion.
Due to the presence of the portion functioning as the pillar and the presence of the flange portion, the outer wall portion does not deform so much as to be noticeable. Therefore, conventionally, in order to increase the rigidity of the partition wall portion 4,
There is one in which a rib 20 as shown in FIG. 7 is formed at a corner portion formed by the bottom portion 2 and the partition wall portion 4. In this conventional example, the rib 20 is provided inside the container 1 partitioned by the partition wall portion 4. There is a problem that the rib 20 damages the stored item when storing the stored item, and when storing the stored item,
There is a problem that a dead space corresponding to the width W of the rib 20 is generated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a synthetic resin container having a partition wall portion without deformation. There is.

[0006]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, the synthetic resin container of the present invention has a gate portion at a portion corresponding to the bottom portion of the container. In a container 1 made of synthetic resin and formed into a flat rectangular shape by injection molding, the container 1 has a bottom portion 2 and an outer side in which a flange portion 9 is integrally provided at an upper end portion from the periphery of the bottom portion 2. It is composed of a wall portion 3 and a partition wall portion 4 for partitioning a portion surrounded by the outer wall portion 3, and a lower end portion of the partition wall portion 4 is integrally continuous with the bottom portion 2 and a side end portion of the partition wall portion 4 is It is integrally continuous with the outer wall portion 3 or the other partition wall portion 4, and the end portion of the partition wall portion 4 on the outer wall portion 3 or other partition wall portion 4 side is thicker than the other portion of the partition wall portion 4. It is characterized in that it is formed as a thin thin portion 5 of It is obtained by achieving the object of the present invention to solve the problems of the conventional example described above.

[0007]

According to the present invention having the above-described structure, however, the end portion of the partition wall portion 4 on the outer wall portion 3 side or the other partition wall portion 4 side is thicker than the other portion of the partition wall portion 4. Since the thin wall portion 5 has a small thickness, even if the partition wall portion 4 is deformed due to contraction, the thin wall portion 5 at the side end is deformed and the contracting force for deforming the partition wall portion 4 is reduced. It is absorbed by the part, and as a result, the partition wall portion 4 can be prevented from being deformed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. The container 1 is of a flat rectangular shape formed by injection molding of synthetic resin, and the container 2 has a bottom portion 2,
An outer wall part 3 that rises up integrally with the bottom part 2 from the periphery of the bottom part 2, and a partition wall part 4 that partitions the part surrounded by the outer wall part 3.
It consists of

The partition wall portion 4 has a lower end portion integrally connected to the bottom portion 2, and a side end portion integrally connected to the outer wall portion 3 or another partition wall portion 4. That is, FIGS. 1 and 2 show an embodiment in which both end portions of the partition wall 4 are integrally continuous with the outer wall portion 3, and FIGS. 4 and 5 show that one end portion of the partition wall portion 4 is different. This is an embodiment in which the partition wall portion 4 of FIG. Of course, the mode of partitioning by the partition wall portion 4 is not limited to the above-described embodiments, and various modes are conceivable. In addition, when the portion surrounded by the outer wall portion 3 is partitioned into a plurality of partitions by the plurality of partition wall portions 4 among the various partition wall configurations, both side ends of the partition wall portion 4 are different from each other. There is also an example in which the two are continuously connected.

A side end portion of the partition wall portion 4 (that is, a portion integrally connected to the outer wall portion 3 or another partition wall portion 4).
Is a thin-walled portion 5 which is thinner than other portions of the partition wall portion 4. A flange portion 9 is integrally formed on the upper end portion of the outer wall portion 3 over the entire length.

When this container 1 is formed by injection molding, it is molded using a molding die 13 as shown in FIG. 3, and the gate portion is formed in the portion of the cavity 10 where the bottom 2 of the container 1 is formed. 11 is arranged and molten resin is injected from the gate portion 11 into the cavity 10 for molding. Then, after the injection of the molten resin is finished, the resin is cooled and hardened, so that the molding die 13 is opened to take out the molded container 1. The embodiment shown in FIG. 3 shows an embodiment in which two gate portions 11 are provided, but one or three or more gate portions 11 may be provided.

Here, in the above-mentioned molding, when injection is finished and cooling is performed, cooling and hardening starts from a place distant from the gate portion 11, and gradually hardens while shrinking toward the gate portion 11. Therefore, the outer wall portion 3 located at the bottom portion 2 which is far from the gate portion 11 cures and tries to shrink so as to return to the gate portion 11 side. Here, since the partition wall portion 4 cures slower than the outer wall portion 3, even if the partition wall portion 4 tries to shrink when it hardens, the outer wall portion 3 has already hardened and the partition wall portion 3 is divided. Since the partition wall portion 4 tries to deform because it cannot absorb the escape of the contraction of the wall portion 4, in the present invention, the side end portion of the partition wall portion 4 is thicker than the other portions of the partition wall portion 4. Since the thin wall portion 5 is provided, the thin wall portion 5 at the side end of the partition wall portion 4 absorbs the escape due to the contraction of the partition wall portion 4, and only the thin wall portion 5 is deformed, and the partition wall portion 4 is not deformed. It will be.

Here, as shown in FIGS. 4 and 5, the partition wall portion 4
Even in an embodiment in which the partition wall portion 4 and another partition wall portion 4 intersect and are integrally continuous, deformation due to shrinkage hardening of the partition wall portion 4 is absorbed by the thin portion 5 at the side end portion to prevent deformation of the partition wall portion 4. It is supposed to do. As described above, in the container having the configuration of the present invention, the partition wall portion 4 does not deform in an arched shape or a meandering shape, and is in a straight state as designed. Although the outer wall portion 3 tends to deform inward in an arched shape due to contraction, the corner portion of the outer wall portion 3 serves as a pillar, and the flange portion 9 provided in the outer wall portion 3 has an inverted L-shaped cross section. Due to the existence of the above, the outer wall portion 3 does not deform so as to be conspicuous.

Here, in order for the thin wall portion 5 to absorb the effect of shrinkage while the effect of shrinkage during hardening of the partition wall portion 4 exerts less influence on the outer wall portion 3 as much as possible, the partition wall portion 4 is harder than the outer wall portion 3 is hardened. It is preferable to slow down the hardening of the wall portion 4.
Therefore, in the present embodiment, when the wall thickness of the partition wall portion 4 is A and the wall thickness of the outer wall portion 1 is B, by setting A ≧ B, the curing of the partition wall portion 4 is delayed. be able to. When the thickness of the thin portion 5 is C, it is preferable that B> C. By the way, as an example, the wall thickness A of the partition wall portion 4 is 3.5 mm and the wall thickness B of the outer wall portion 1 is 2.5 m.
m, and the thickness C of the thin portion 5 is 2 mm. Further, by increasing the wall thickness A of the partition wall portion 4 in this way, the rigidity of the partition wall portion 4 can also be increased.

Of course, in the present invention, the partition wall portion 4
The thickness A may be the same as the thickness A of the outer wall portion 1. In addition, when the thin wall portion 5 is formed on the partition wall portion 4,
As shown in (a) and (b), the thin wall portion 4 may be formed by recessing only one side surface of the partition wall portion 4.

[0016]

According to the present invention, as described above, in the container having a square corner made of synthetic resin formed by injection molding with the gate portion located at the portion corresponding to the bottom of the container, The container is composed of an outer wall part that integrally rises from the periphery of the bottom part and integrally has a flange part on the upper end part, and a partition wall part that partitions the part surrounded by the outer wall part, and the lower end part of the partition wall part Is integrally connected to the bottom portion, and the side end portion of the partition wall portion is integrally connected to the outer wall portion or another partition wall portion,
Since the outer wall part of the partition wall part or the end part on the side of the other partition wall part is a thin part thinner than the other part of the partition wall part, the partition wall part meanders or shrinks when it shrinks and hardens. It can be configured so as not to be deformed. That is, the shrinkage during curing of the partition wall portion is absorbed by the thin wall portion, the partition wall portion can be a structure that does not deform, as a result, it is possible to provide a synthetic resin container of high commercial value that the partition wall portion does not deform, Since it is not necessary to form a rib in the corner portion formed by the partition wall portion and the bottom portion for reinforcement as in the conventional case, the rib may damage stored items, or the dead space may be the width of the rib. The problem of the conventional example does not exist.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is a cross-sectional view showing the above molding die.

FIG. 4 is a perspective view of another embodiment of the present invention.

FIG. 5 is a plan sectional view of the above.

6A and 6B are enlarged cross-sectional views of another embodiment of the thin portion of the present invention.

FIG. 7 is a cutaway perspective view of a conventional example.

[Explanation of symbols]

 1 Container 2 Bottom 3 Outer Side Wall 4 Partition Wall 5 Thin Wall 9 Flange

Claims (1)

[Claims] 1. A container made of synthetic resin and having a flat rectangular shape formed by injection molding in which a gate portion is located at a portion corresponding to the bottom portion of the container, and the container is integrally raised from the periphery of the bottom portion and has an upper end. The outer wall portion integrally provided with a flange portion, and a partition wall portion for partitioning the portion surrounded by the outer wall portion, the lower end portion of the partition wall portion is integrally continuous with the bottom portion of the partition wall portion. The side end is integrally continuous with the outer wall portion or another partition wall portion, and the end portion of the partition wall portion on the outer wall portion or other partition wall portion side is thinner than the other portion of the partition wall portion. A synthetic resin container characterized by being formed as a thin portion.