JPH10291536A - Synthetic resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve appearance and productivity of a synthetic resin container by forming a double wall comprising approximately vertical side walls placed oppositely and a top face coupling between upper ends of the side walls and a partition between the double wall and a side wall of a container body and also by forming them integrally. SOLUTION: A partition P is placed between approximately vertical side walls w1 of a double wall W and a parallel side wall c1. A container body C cannot be thin in a bottom c2, an upper flange c3 or the like by reason of strength. Thus since cooling efficiency of the container body C after forming is poorer than that of the partition P, shrinkage of the container body is larger. Thus although pressure is applied to the partition P due to pressure contracting inward in the container body C during a cooling process of the molded container, the pressure is absorbed by a fact that the side walls w1 of the double wall W deform in a direction that they come close to each other, thereby preventing the partition P from deforming.

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.

[0002]

2. Description of the Related Art Conventionally, there has been known a synthetic resin container in which a partition is integrally formed with a box-shaped container main body having side walls and a bottom portion by injection molding or the like.

[0003]

Problems to be solved by the present invention will be described with reference to FIG. 9 which is a plan view of a conventional synthetic resin container.

[0004] When various products are molded by injection molding or the like, it is known that in a cooling process after molding, the shrinkage ratio of a thick part is larger than that of a thin part. By the way, the partition P is divided into the side wall c1 and the bottom c.
When molded integrally with the container body C made of 2 by injection molding or the like, the thickness of the partition P is usually smaller than the thickness of the side wall c1. The side wall c1 shrinks more than the thin partition P, so that the partition P shrinks more inward of the container body C than the shrinkage of the partition P.
As shown in FIG. 9, there is a problem that the shrinkage pressure causes a wavy deformation.

[0005] In order to prevent the partition P from being deformed, the thickness of both ends of the partition P is made thinner than the thickness of the center of the partition P, and both ends of the partition P are separated from each other by the partition P. By making it easier to deform than the central part of the wall, the thick side wall c1 is formed.
There is also known a synthetic resin container that absorbs the larger shrinkage by deforming the thin portions at both ends of the partition P, but the strength of the thin portions at both ends of the partition P decreases, There is a problem that it is difficult to remove the mold because the partition P is damaged or both ends of the partition P are thin portions.

An object of the present invention is to solve the above-mentioned problems of the conventional synthetic resin container and to provide a synthetic resin container with improved appearance and productivity of the synthetic resin container.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention firstly comprises a vertically arranged side wall and a top plate connecting the upper end of the side wall. A double wall portion, and a partition formed between the double wall portion and the side wall of the container body, and the double wall portion, the partition and the container body are integrally formed. Has a slit formed on the top plate of the double wall, and thirdly,
The wall thickness of the side wall of the double wall portion adjacent to the connection portion of the double wall portion to which the partition is connected or the wall thickness of the side wall of the container body adjacent to the connection portion of the side wall of the container body to which the partition is connected Fourth, the thickness is smaller than the thickness of the double wall portion or the other portion of the side wall of the container body. Fourth, along the partition,
A slit is formed in the side wall of the container main body or the side wall of the double wall portion adjacent to the partition, and fifthly, between the connecting portions of the double wall portions to which the partition is connected. , The vertical ribs tapering downward are formed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a synthetic resin container of the present invention, FIG. 2 is a side sectional view taken along the line II of FIG. 1, and a part of the synthetic resin container of the present invention. FIG. 3 is a perspective view including a cutout portion, FIG. 4 is a perspective view including a partially cutout portion of another embodiment of the synthetic resin container of the present invention, and still another embodiment of the synthetic resin container of the present invention. 5 which is a plan view of FIG. 5 and FIG. 6 which is an enlarged plan view of a portion surrounded by a dashed-dotted line circle in FIG.
FIG. 7 is a perspective view of a synthetic resin container of the present invention including a partially cutout portion according to still another embodiment, and FIG. 7 is a perspective view of a synthetic resin container of the present invention including a partially cutout portion of still another embodiment. An embodiment of the present invention will be described with reference to FIG.
The present invention is not limited to the embodiment unless it exceeds the gist of the present invention.

As shown in FIGS. 1 and 2, the synthetic resin container is disposed between a box-shaped container main body C having a side wall c1 and a bottom portion c2, and one opposing side wall c1. It is formed from the double wall portion W provided and the plate-shaped partition P disposed between the other opposite side wall c1 and the double wall portion W. The partition P is formed integrally with the container body C by injection molding or the like. In addition, c3 is an upper flange that extends horizontally from the upper end of the side wall c1 so as to surround the side wall c1, and
c4 is a lower flange horizontally extending outward from the lower end of the side wall c1, and c5 is horizontally extending outward from the outer surface of the side wall c1 below the upper flange c3. It is an intermediate flange. Furthermore, the upper flange c
Vertical ribs c6 are formed between the lower flange 3 and the lower flange c4 at appropriate intervals. Such a lower flange c
4. The intermediate flange c5 and the vertical rib c6 can be omitted as appropriate.

As shown in FIGS. 2 and 3, the double wall W has an inverted U-shaped cross section perpendicular to the wall surface of the double wall W. The heavy wall portion W is provided with a substantially vertical side wall w1 disposed at a predetermined interval and opposed to each other.
And a top plate w2 connecting the upper end of the side wall w1 and
The lower part of the double wall portion W is open and formed without a bottom. Accordingly, a slit c2 'is formed in the bottom c2 of the container body C located below the double wall W.

A substantially vertical side wall w1 of the double wall W described above.
And a partition P is arranged between the double wall portion W and the side wall c1 parallel to the double wall portion W. By the way, the container body C cannot be reduced in thickness such as the bottom c2 and the upper flange c3 for the reason of strength, and the reinforcing rib is formed on the lower surface of the bottom c2. Since the cooling efficiency of the container body C after molding is lower than the cooling efficiency of the partition P, the contraction of the container body C becomes larger than the contraction of the partition P. For this reason, in the cooling process of the molded synthetic resin container, pressure is applied to the partition P due to the contraction pressure contracting inward of the container body C, and the pressure is increased by the double wall portion W. Is absorbed by the deformation of the side walls w1 in directions approaching each other, and therefore, the partition P is not deformed.

The embodiment shown in FIG.
Top w connecting the upper ends of the side walls w1 arranged opposite to each other
2, a slit w3 having a predetermined length is formed along the longitudinal direction of the double wall portion W. The slit w3 is formed at least in a part of the top plate w2 where the connecting part w4 to which the partition P is connected is located. As described above, since the slit w3 is formed in the top plate w2 of the double wall portion W, the side walls w1 of the double wall portion W are more likely to be deformed in directions approaching each other. Can be prevented from being deformed.

In the embodiment shown in FIGS. 5 and 6, the thickness (d1) of the side wall w1 of the double wall W adjacent to the connecting portion w4 of the double wall W to which the partition P is connected. ) Is made thinner than the thickness (d2) of the other part, and the side wall w of the double wall W is formed.
No. 1 makes it easier to deform in a direction closer to each other. Further, the thickness (d3) of the side wall c1 of the container body C adjacent to the connection portion c1 ′ of the side wall c1 of the container body C to which the partition P is connected is made smaller than the thickness (d4) of the other portions. Thus, the deformation of the side wall c1 of the container body C in the thin portion is made easier to prevent the deformation of the partition P. Double wall W to which partition P is connected
The thickness (d1) of the side wall w1 of the double wall portion W adjacent to the connecting portion w4 of the container body and the side wall c1 of the container body C adjacent to the connecting portion c1 ′ of the side wall c1 of the container body C to which the partition P is connected. One of the thicknesses (d3) can be made thinner than the other part, or both can be made thinner than the other part. Each of the parts corresponding to (a), (b), and (c) surrounded by a dashed-dotted circle in FIG. 5 corresponds to (a), (b), and (c) shown in FIG. It corresponds to an enlarged plan view.

The embodiment shown in FIG.
Are formed between the connecting portions w4 of the double wall portions W to which the vertical ribs w5 are tapered downward. By forming such a vertical rib w5, the thickness of the connecting portion w4 of the double wall portion W to which the partition P is connected is increased, and therefore, in the cooling process, this portion is formed by the double wall portion. The side walls w1 of W shrink in a direction closer to each other. As described above, since the side walls w1 of the double wall portion W contract in a direction closer to each other, the pressure applied to the partition P is reduced by the contraction pressure of the side wall c1 contracting inward of the container body C. Therefore, it is possible to more reliably prevent the partition P from being deformed.

The embodiment shown in FIG.
And a slit c7 is formed in the side wall c1 of the container body C adjacent to the middle partition P, and such a slit c7 is, as shown in FIG. A plurality of slits can be formed at a predetermined interval along P, or a single continuous slit c7 can be formed along the middle partition P. In addition, slit c7
Is, as shown in FIG. 8, sandwiching the partition P,
Forming on both sides of the side wall c1 of the container body C,
It can also be formed on only one side of the side wall c1 of the container body C. Further, such a slit c7 is formed by a partition P
Along and adjacent to the partition P, it can be formed on the side wall w1 of the double wall portion W.

By forming the slit c7 as described above on the side wall c1 of the container body C or the side wall w1 of the double wall portion W, the cooling efficiency of the container body C is increased and the container shrinks inward. Due to the contraction pressure of the side wall c1, the pressure applied to the partition P is reduced, and the distortion due to the internal stress is eliminated, thereby increasing the strength of the synthetic resin container. In addition, since the cooling efficiency of the entire synthetic resin container is increased, the molding cycle time of the synthetic resin container can be reduced,
The productivity of the synthetic resin container is improved.

In the above-described embodiment, an example in which one partition P or double wall W is formed in the container body C is shown. It can also be formed.

[0018]

Since the present invention has the above-described structure, the following effects can be obtained.

[0019] A double wall comprising a substantially vertical side wall and a top plate connecting the upper end of the side wall, and a partition between the double wall and the side wall of the container body. In addition to the formation, the double wall portion, the partition and the container body are integrally formed, so that the partition can be prevented from being deformed.

Since the slit is formed in the top plate of the double wall portion, the deformation of the side wall of the double wall portion becomes easier, and
Deformation of the partition can be reliably prevented.

The thickness of the side wall of the double wall portion adjacent to the connecting portion of the double wall portion to which the inner partition is connected, or the thickness of the side wall of the container body adjacent to the connecting portion of the side wall of the container body to which the inner partition is connected. Since the wall thickness is made thinner than the thickness of the double wall portion or the other portion of the side wall of the container body, the deformation of the double wall portion or the side wall of the container body becomes easy, and therefore, the deformation of the partition is reduced.
It can be prevented more reliably.

Since the slit is formed in the side wall of the container body or the side wall of the double wall portion, the cooling efficiency of the container body is enhanced, and the contraction pressure of the side wall which contracts inward of the container body increases
The pressure applied to the partition is reduced, and distortion due to internal stress is eliminated, thereby increasing the strength of the synthetic resin container. Further, since the cooling efficiency of the entire synthetic resin container is improved, the molding cycle time of the synthetic resin container can be shortened, and the productivity of the synthetic resin container improves.

Since the vertical ribs tapering downward are formed between the connecting portions of the double walls to which the inner partitions are connected, the side walls of the double walls contract in a direction closer to each other. Therefore, the pressure applied to the partition is reduced, and therefore, the deformation of the partition can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin container of the present invention.

FIG. 2 is a side sectional view taken along the line II of FIG. 1;

FIG. 3 is a perspective view of the synthetic resin container of the present invention including a partially cut-away portion.

FIG. 4 is a perspective view of a synthetic resin container according to another embodiment of the present invention, including a partially cut-away portion.

FIG. 5 is a plan view of still another embodiment of the synthetic resin container of the present invention.

FIG. 6 is an enlarged plan view of a portion surrounded by a dashed line circle in FIG.

FIG. 7 is a perspective view of a synthetic resin container according to another embodiment of the present invention including a partially cutaway portion.

FIG. 8 is a perspective view of a synthetic resin container according to a still further embodiment of the present invention, including a partially cut-away portion.

FIG. 9 is a plan view of a conventional synthetic resin container.

[Explanation of symbols]

 C ····· Container body P ····· Intermediate partition W ······ Double wall

Claims (5)

[Claims] A double wall comprising a substantially vertical side wall and a top plate connecting the upper end of the side wall, and a middle wall between the double wall and the side wall of the container body. A synthetic resin container, wherein a partition is formed, and the double wall portion, the intermediate partition, and the container body are integrally formed. 2. The synthetic resin container according to claim 1, wherein a slit is formed in the top plate of the double wall portion. 3. The thickness of the side wall of the double wall portion adjacent to the connecting portion of the double wall portion to which the inner partition is connected, or the thickness of the side wall of the container body adjacent to the connecting portion of the side wall of the container body to which the inner partition is connected. The synthetic resin container according to claim 1 or 2, wherein the thickness of the side wall is smaller than the thickness of the double wall portion or the other portion of the side wall of the container body. 4. The container according to claim 1, wherein a slit is formed in the side wall of the container body or the side wall of the double wall portion along the partition and adjacent to the partition. A container made of the synthetic resin according to any one of the preceding claims. 5. A vertical rib which is tapered downward as it goes down between connecting portions of the double wall portion to which the inner partition is connected. The container made of synthetic resin described in 1.