JP3809246B2 - Plastic container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin container having a partition.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a synthetic resin container is known in which a partition is integrally formed by injection molding or the like, and a box-shaped container body having a side wall and a bottom.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention will be described with reference to FIG. 4 which is a plan view of a conventional synthetic resin container.
[0004]
When various products are molded by injection molding or the like, a phenomenon is known in which the shrinkage rate of the thick part is larger than that of the thin part in the cooling process after molding. By the way, when the partition P is integrally formed with the container main body C including the side wall c1 and the bottom c2 by injection molding or the like, the wall thickness of the partition P is usually thinner than the wall thickness of the side wall c1. In the cooling process after molding, the thick side wall c1 contracts more than the thin partition P, and therefore the partition P is larger than the contraction of the partition P, and the container body C Due to the contraction pressure of the side wall c1 that contracts inward, there is a problem that it deforms into a wave shape as shown in FIG.
[0005]
In order to prevent deformation of the partition P, the thickness of both ends of the partition P is made thinner than the thickness of the center of the partition P so that both ends of the partition P are connected to the center of the partition P. There is also known a synthetic resin container that absorbs greater shrinkage of the thick side wall c1 by deformation of the thin wall portions at both ends of the inner partition P by facilitating deformation. There is a problem in that the strength of the thin wall portions at both ends of the partition P is reduced, the inner partition P is damaged, or the both ends of the inner partition P are thin wall portions, so that it is difficult to remove the mold.
[0006]
The objective of this invention is providing the synthetic resin container which improved the external appearance and productivity of the synthetic resin container while solving the subject which the conventional synthetic resin container mentioned above has.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is a synthetic resin container in which a container body and a partition are integrally formed, and a side cross-sectional shape perpendicular to the side surface of the partition is a vertically long base. The width of the bottom surface of the partition is constant over the entire length of the partition, and the gradient of the side surface near the side wall of the partition connected to the side wall of the container body is The length of the side surface in the vicinity of the side wall that is larger than the gradient of the side surface of the central portion and has a gradient larger than the gradient of the side surface of the central portion of the partition is approximately 10% to approximately 20% of the total length of the partition. it is obtained by the.
[0008]
【Example】
1 is a perspective view of the synthetic resin container of the present invention, FIG. 1 is a partial enlarged perspective view of the synthetic resin container of the present invention, and FIG. 2 is a synthetic view of the present invention. An embodiment of the present invention will be described with reference to FIG. 3 which is a side sectional view of the central part of the partition of the resin container.
[0009]
The synthetic resin container of the present invention includes a container body C formed in a box shape including a side wall c1 and a bottom c2, and a partition P disposed between the opposite side walls c1, and the container body C And the partition P is integrally molded 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 extended from the lower end of the side wall c1 so as to surround the bottom c2. The lower flange c5 is an intermediate flange extending horizontally from the outer surface of the side wall c1 below the upper flange c3. Such flanges c3, c4, and c5 can be omitted as appropriate. c6 is a vertical rib erected from the outer surface of the side wall c1 as necessary.
[0010]
As shown in FIG. 3, the side cross-sectional shape perpendicular to both side surfaces p <b> 1 of the middle partition P is formed in a vertically long trapezoidal shape, and is around the middle height of the middle partition P. The wall thickness is formed substantially the same as the wall thickness of the side wall c1 of the container body C. By the integral molding, the gradient of the side surface p1 ′ in the vicinity of the side wall c1 of the partition P connected to the side wall c1 is larger than the gradient of the side surface p1 ″ at the center of the partition P. For example, the partition P The gradient (θ1) formed by both side surfaces p1 ″ of the central portion of the inner wall is about 30 minutes, whereas the gradient (θ2) formed by both side surfaces p1 ′ near the side wall c1 of the partition P is about 50 minutes. is there. The width (W) of the bottom surface p2 of the partition P is constant over the entire length of the partition P, and does not change between the central portion of the partition P and the vicinity of the side wall c1. In addition, both side surfaces p1 ′ in the vicinity of the side wall c1 of the partition P having a large gradient are indicated by dotted lines in FIG.
[0011]
In the present invention, since the gradient of the side surface p1 ′ in the vicinity of the side wall c1 of the partition P connected to the side wall c1 is larger than the gradient of the side surface p1 ″ at the center of the partition P, the partition P It is easy to remove the mold at the corner 1 formed by the side wall c1 and the wall thickness of the partition P and the side wall c1 of the container body C are configured to be substantially the same. In the cooling process after injection molding, the difference in shrinkage between the partition P and the container body C is small, and therefore the partition P is deformed in a wave shape by the shrinkage pressure of the side wall c1 shrinking inward of the container body C. There is nothing.
[0012]
In addition, since the side cross-sectional shape perpendicular to the both side surfaces p1 of the partition P is formed in a vertically long trapezoidal shape, the bending strength of the partition P is increased, and is therefore pressed by the stored article. There is no deformation or damage, and such a partition P increases the strength of the synthetic resin container.
[0013]
The length (L) of the side surface p1 ′ in the vicinity of the side wall c1 of the partition P having a larger gradient than the gradient at the center of the partition P varies depending on the size, depth, etc. of the container body C. About 10 to 20% of the total length is preferable. Moreover, if the gradient (θ1) at the center of the partition P and the gradient (θ2) at both ends are too large, the difference in thickness between the bottom p2 and the top surface p3 of the partition P increases, and the bottom of the partition P Due to the shrinkage difference between p2 and the upper surface p3, the partition P itself is deformed, or a recess called sink is formed in the partition P, resulting in a problem that the commercial value is lowered.
[0014]
In the above-described embodiment, an example in which one partition P is formed on the container body C is shown. However, it is also possible to form a plurality of partitions P and to form the partitions P in a cross shape. It can also be arranged to intersect.
[0015]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be achieved.
[0016]
Since the gradient of the side surface of the central portion of the middle partition is made smaller than the gradient of the side surface of the middle partition near the side wall of the container body, it is easy to remove the mold at the corner formed by the middle partition and the side wall.
[0017]
Since the wall thickness of the inner partition and the wall thickness of the side wall of the container main body are formed substantially the same, it is possible to prevent the deformation of the inner partition due to the shrinkage difference between the side wall of the container main body and the inner partition during the cooling process. it can.
[Brief description of the drawings]
FIG. 1 is a perspective view of a synthetic resin container of the present invention.
FIG. 2 is a partially enlarged perspective view of the synthetic resin container of the present invention at a portion surrounded by a one-dot chain line in FIG.
FIG. 3 is a cross-sectional side view of the central portion of the partition of the synthetic resin container of the present invention.
FIG. 4 is a plan view of a conventional synthetic resin container.
[Explanation of symbols]
C: Container body P: Partition

Claims (1)

A container made of synthetic resin in which a container body and a partition are integrally formed, and a side cross-sectional shape perpendicular to a side surface of the partition is formed in a vertically long trapezoidal shape, and a bottom surface of the partition The width is constant over the entire length of the partition, and the slope of the side surface near the side wall of the partition that is connected to the side wall of the container body is larger than the slope of the side surface of the center part of the partition. And the length of the side surface vicinity of a side wall which has a gradient larger than the gradient of the side surface of the center part of a partition is about 10 to about 20% of the full length of a partition, The synthetic resin container characterized by the above-mentioned.

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