JP4936247B2 - Synthetic resin square housing - Google Patents

Description

  The present invention relates to a rectangular prismatic body made of synthetic resin represented by a biaxially stretched blow-molded bottle made of polyethylene terephthalate resin, in which a vacuum absorbing panel is formed on a body part.

Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used for beverages such as water, sports drinking water, tea and juice. Patent Document 1 describes, as an example, a square-shaped casing in which a flat cross-sectional shape of a body portion is rounded, which is a typical example of a rectangular casing (see FIG. 4).
The housing shown in FIG. 4 is a biaxially stretched blow housing 1 made of a synthetic resin, and has a mouth tube portion 2 continuously provided through a shoulder portion 3 having a tapered rectangular tube shape at the upper end. The body portion 4 having a bottom portion 8 continuously provided at the lower end has a square-shaped square tube structure with a rounded corner, and is formed by a corner wall 6 that is a portion where the body portion 4 is rounded with a peripheral wall 5.

And in this housing | casing 1, although the decompression absorption panel 11 is formed in depression shape in each surrounding wall 5, in the use filled with the content liquid at about 80-90 degreeC for the purpose of sterilization, the content after filling Since the inside of the liquid is reduced as the temperature of the liquid is reduced, the reduced pressure absorption panel 11 prevents local depression-like deformation of the body portion 4 in the reduced pressure state and prevents the appearance from being noticeable. The so-called decompression absorption function is exhibited. Further, the corner wall 6 functions as a pillar portion that supports the structure of the housing 1.
JP 2001-180637 A

On the other hand, this type of enclosure is used in large quantities for food applications, etc., and in many cases is disposable. Therefore, from the viewpoint of saving resources and reducing costs related to packaging, it is possible to reduce the cost of packaging. There is a demand for weight reduction.
However, this reduction in thickness is naturally limited in terms of the rigidity of the casing and the moldability of the casing, and the casing in which the above-described reduced pressure absorption panel (hereinafter sometimes referred to simply as a panel) is formed. Then, as the panel is deformed in a depressed state when the pressure is reduced, a corner wall that functions as a pillar may buckle, which may cause a fatal problem as a housing. is there. In particular, this problem becomes more serious when a single vacuum absorption panel has a large area in order to fully exhibit the vacuum absorption function.

  In view of this, the present invention technically solves the problem of buckling of the corner wall, which functions as a column portion related to the vacuum absorption panel, when the rectangular casing is thinned by improving the shape of the rectangular casing. It is to be an issue.

Of the present invention for solving the above technical problem, the means of the invention according to claim 1 is:
A flat panel shaped peripheral wall and four corner walls connecting the peripheral walls in a chamfered shape, and a flat cross-sectional shape having a rectangular body, and a vacuum absorbing panel formed in a concave shape on the peripheral wall In the rectangular housing with
At the boundary between adjacent peripheral walls and corner walls, at least approximately, vertical groove-shaped ribs are formed in the height range along the left and right side ends of the main vacuum absorbing panel, and within the height range of the corner walls. A plurality of transverse groove-like lateral ribs are formed in parallel ,
The right and left ends of the horizontal ribs are connected to the left and right ends of the adjacent vertical ribs .

  The inventors of the present application examined the thinning of the housing, and when the body wall of the housing was thinned, the depression-like deformation in the vacuum absorption panel formed on the peripheral wall forming the body However, it does not stay at the left and right ends of the panel, and extends beyond the ends to a corner wall that functions as a pillar of the frame through a peripheral wall adjacent to the left and right ends. It discovered that it buckled, and came to create the structure of the said Claim 1.

That is, according to the above-described configuration of the first aspect, by forming vertical ribs at the boundary between the peripheral wall and the corner wall, it is possible to effectively advance the depression-like deformation to the corner wall with the decompression absorbing panel as the base at the time of decompression. In addition to the fact that the corner ribs themselves are strengthened by the lateral ribs, the effect of the vertical ribs and the lateral ribs is combined, so that the corner walls accompanying the depression deformation of the panel during decompression are combined. It becomes possible to effectively prevent buckling deformation in the portion.
Also, by connecting the vertical and horizontal ribs formed in the groove shape, the effect of the ribs can be exhibited in a three-dimensional manner, and more effectively, a depression-like deformation with the reduced pressure absorption panel as the base end The progress to the corner wall can be suppressed, and the buckling strength of the corner wall itself can be enhanced.
In addition, when connecting the vertical rib and the horizontal rib in this way, it is preferable to connect the vertical rib and the horizontal rib in different depths at the connecting portion, thereby making the corner wall of the depression-like deformation. Can be more effectively suppressed.

  In consideration of the appearance (designability), the reduced pressure absorption function, the rigidity of the housing, etc., the reduced pressure absorption panel is arranged in various forms on the peripheral wall. For example, in a case of about 500 ml, a vertically long panel is arranged over almost the entire height range of the peripheral wall, or panels of the same shape are arranged vertically by dividing the body part into two by a circumferential groove. Or a vertically long panel and a small square panel below.

Here, the reduced-pressure absorption function is exerted mainly on a panel that is vertically long and has a large area, and the large depression-like deformation extends to the corner wall through the peripheral wall. The main vacuum decompression panel is described.
In addition, the height range for forming the vertical ribs and the horizontal ribs is not necessarily the same as the height range of the vacuum absorbing panel, and can be set while taking into consideration the mode of depression deformation. It is written as “abbreviation”.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the first aspect of the invention, the vertical rib effectively suppresses the progress of the depression-like deformation with the decompression absorbing panel at the time of decompression to the corner wall, and the lateral rib prevents the corner wall itself. By strengthening the buckling strength, it is possible to effectively prevent the buckling deformation in the corner wall portion due to the thinning due to the combined effect of the vertical rib and the horizontal rib.

Also , by connecting the vertical and horizontal ribs formed in the groove shape, the effect of the ribs can be exhibited in a three-dimensional manner, and more effectively, a depression-like deformation with the reduced pressure absorption panel as the base end The progress to the corner wall can be suppressed, and the buckling strength of the corner wall itself can be enhanced.

Hereinafter, embodiments of the synthetic resin prismatic casing of the present invention will be described along with examples with reference to the drawings.
1 to 3 show one embodiment of the rectangular housing of the present invention, FIG. 1 is a front view, FIG. 2 is a plan sectional view along the line AA in FIG. 1, and FIG. It is a longitudinal cross-sectional view along the BB line in FIG. The housing 1 is a biaxial stretch blow molded product made of PET resin. The housing 1 is for a 500 ml container having a mouth tube portion 2, a shoulder portion 3 having a tapered rectangular tube shape, a body portion 4 having a square tube structure having a square shape with a square section and a bottom portion 8. Is. The body 4 is formed of four peripheral walls 5 and four corner walls 6 that connect the adjacent peripheral walls 5 in a square shape.

The body 4 is formed with a circumferential groove 7 at the bottom, approximately 1/3 of the height position, for securing the lateral rigidity of the housing. The decompression absorption panel 11 (11a, 11b) is formed with the peripheral wall 5 depressed.
Among these reduced pressure absorption panels 11, the upper reduced pressure absorption panel 11a has a height dimension of about 2/3 of the height dimension of the body part 4, and bears the main part of the reduced pressure absorption function.

  In the boundary portion between the adjacent peripheral wall 5 and corner wall 6, vertical groove-shaped vertical ribs 14 are formed in substantially the same height range along the left and right end portions of the reduced pressure absorption panel 11 a. Within this height range, a large number (5 in this embodiment) of horizontal groove-shaped horizontal ribs 15 are formed on the corner wall 6, and the left and right ends of the horizontal ribs 15 are the left and right ends of the vertical ribs 14. By connecting the vertical ribs 14 and the horizontal ribs 15 in this way, the rib effect can be exhibited three-dimensionally.

  Here, a vertically long and large-area vacuum absorbing panel such as the upper vacuum absorbing panel 11a can effectively exhibit the vacuum absorbing function. On the other hand, the panel 11a is greatly depressed in a reduced pressure state. In particular, when the body wall is thinned, the deformation progresses to the peripheral walls 5 positioned on the left and right sides of the reduced pressure absorption panel 12a, and further to the corner wall 6 that functions as a pillar portion of the housing 1. It has a problem that the corner wall 6 is buckled and deformed.

  In that respect, by disposing the vertical ribs 14 and the horizontal ribs 15 as described above, the vertical ribs 14 effectively advance the depression-like deformation to the corner wall 6 with the reduced pressure absorption panel 11a as the base end. In addition, by strengthening the buckling strength of the corner wall 6 itself with the lateral ribs 15, the effect of the longitudinal ribs 14 and the lateral ribs 15 is combined, and the corner wall 6 part due to thinning is combined. Can effectively prevent buckling deformation.

Further, as described above, by connecting the vertical ribs 14 and the horizontal ribs 15, the rib effect can be exhibited in a three-dimensional manner, and more effectively, a depression-like deformation with the reduced pressure absorption panel 11 a as the base end. The progress to the corner wall 6 can be suppressed, and the buckling strength of the corner wall 6 itself can be enhanced.
When the vertical ribs 14 and the horizontal ribs 15 are connected in this way, as in the present embodiment (see FIG. 2), the groove depths of the vertical ribs 14 and the horizontal ribs 15 are made different at the connecting points. It is preferable to connect to, and thereby, the progress of the depression-like deformation to the corner wall 6 can be more effectively suppressed.

  In addition, although the lower-pressure absorbing panel 11b in the lower part bears a part of the reduced-pressure absorbing function, since the area is small, there is little possibility that the depression-like deformation in the part propagates to the peripheral wall 5 in the periphery. Then, the vertical rib 14 and the horizontal rib 15 corresponding to this panel 11b are not formed.

  In addition, since the vacuum absorption panel 11a in the upper portion is vertically long and has a large area, local depression deformation is likely to occur in the panel 11a itself, and thus a large number (5 in this embodiment) as in this embodiment. It is preferable to form a horizontal groove-shaped recess 12 (see FIG. 3).

As mentioned above, although embodiment of this invention was described along the Example, of course, this invention is not limited to this Example.
For example, there are various modes of arrangement of the vacuum absorbing panel, and one panel is arranged in the longitudinal direction over almost the entire height range of the trunk portion, or substantially the same shape up and down as shown in FIG. Even when this panel is disposed, the cooperative action effect of the vertical rib and the horizontal rib of the present invention is exhibited. Further, the capacity of the casing is not limited to about 500 ml, and a rectangular casing having a rectangular cross section of the trunk portion may be used. Further, the present invention is not limited to a PET resin casing, and may be applied to other resin casings such as a polypropylene resin.

  As described above, the synthetic resin square casing of the present invention eliminates the problem of buckling of the corner wall according to the reduced pressure absorption panel when the body wall is thinned, thereby saving resources and reducing costs. A wide range of development is expected from the perspective.

It is a whole front view which shows one Example of the square housing of this invention. It is a plane sectional view shown along the AA line of the case of Drawing 1. It is a longitudinal cross-sectional view shown along the BB line of the housing of FIG. It is a whole front view which shows an example of the conventional square housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Body part 5; Peripheral wall 6; Corner wall 8; Bottom part 11 (11a, 11b);

Claims (1)

It has a body part (4) having a rectangular plane cross section composed of four flat peripheral walls (5) and four corner walls (6) connecting the peripheral walls (5) in a chamfered shape. And in the rectangular housing provided with the vacuum absorbing panel (11) formed in a depressed shape on the peripheral wall (5),
At the boundary portion between the adjacent peripheral wall (5) and the corner wall (6), vertical groove-shaped vertical ribs (14) are formed in a height range substantially along the left and right end portions of the main vacuum absorbing panel (11). And a plurality of lateral groove-shaped lateral ribs (15) are formed in parallel in the height range of the corner wall (6) ,
A synthetic resin prismatic casing in which left and right ends of the horizontal rib (15) are connected to left and right ends of the adjacent vertical rib (14) .

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