JP5700329B2 - Synthetic resin round frame - Google Patents

Description

The present invention relates to a synthetic resin round casing.

  Conventionally, a biaxially stretched blow molded casing (hereinafter referred to as PET bottle) made of polyethylene terephthalate (hereinafter referred to as PET) resin has excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc. It is widely used as a container for various beverages. Conventionally, as a method for filling a PET bottle with a content liquid such as fruit juice or tea that requires sterilization, there is a method called so-called high-temperature filling, in which the content liquid is filled into a casing at a temperature of about 90 ° C., The cap is sealed and then cooled, and the inside of the housing is in a considerably reduced pressure state.

  For this reason, for applications involving high-temperature filling as described above, a so-called reduced pressure absorption panel, which is a region that can be easily deformed by depression, is formed in the body part, and this reduced pressure absorption panel is used during pressure reduction. By deforming into a depressed shape, it maintains a good appearance and secures rigidity and buckling strength as a housing in parts other than the vacuum absorption panel, so that the transportation line of the housing, stacked storage, inside a vending machine, etc. So that there are no troubles.

For example, Patent Document 1 describes a relatively small round casing having a vacuum absorbing panel. FIG. 7 shows an example of this type of relatively small round casing.
The casing 101 is a round PET bottle having a capacity of 350 ml, and is formed of a mouth tube portion 102, a shoulder portion 103, a trunk portion 104, and a bottom portion 105, and is located at the height positions of the upper end portion and the lower end portion of the trunk portion 104. A circumferential groove 106 is formed, and six decompression absorption panels 112 are formed in a recessed shape so as to surround the circumference with a step portion 111 between the circumferential grooves 106.

  The reduced pressure absorption panel 112 has a substantially flat plate shape, and when the inside of the housing 101 is in a decompressed state, it can be easily deformed into a concave shape inside, so that the housing is deformed into distortion in appearance. Thus, a function of absorbing (relaxing) the reduced pressure state (hereinafter, referred to as a reduced pressure absorption function) can be exhibited without giving the feeling. Further, the column portion 113 remaining between the adjacent reduced pressure absorption panels 112 bears rigidity and buckling strength as a housing.

On the other hand, when it is necessary to avoid the formation of the vacuum absorption panel on the body due to the design requirements related to the appearance of the housing, or the vacuum absorption panel itself is a part that is easily bent and deformed, In applications where it is necessary to increase the surface rigidity and impart high shape retention to the barrel, or for sale in a vending machine, for example, as disclosed in Patent Document 2, without forming a vacuum absorbing panel on the barrel A synthetic resin casing made to exhibit a reduced pressure absorption function by the depression-like deformation of the bottom wall of the bottom is used.

Japanese Patent Laid-Open No. 2005-132452 JP 2007-269392 A

Here, in the PET bottle having a relatively small capacity of about 350 ml as shown in FIG. 7, the range in which the reduced pressure absorption panel can be formed is limited. Further, even when the reduced-pressure absorption function is exhibited in the recessed portion at the bottom, it is difficult to sufficiently exhibit the reduced-pressure absorption function.
On the other hand, from the viewpoint of resource saving cost, the weight reduction of the chassis, that is, the thinning of the peripheral wall is required, and considering the balance between the vacuum absorption function and the rigidity and buckling strength of the chassis, the required performance limit is reached. The shape design is made in a close region, and if the degree of thinning is further advanced, there arises a problem that the peripheral wall of the shoulder portion of the tapered cylindrical shape is deformed into a depressed shape.

Therefore, the present invention is a synthetic resin round casing having a vacuum absorption panel, a depression recess and the like disposed on the body and bottom, and a local depression-like deformation at the time of decompression at the shoulder. It is an object of the present invention to create a peripheral wall structure that effectively suppresses the above-described problem and that exhibits a function of complementing the reduced-pressure absorption function at the trunk portion and the bottom portion at the shoulder portion.

Among the means for solving the above technical problems, the main configuration of the present invention is as follows.
It has a mouth tube part, a tapered cylindrical shoulder part, a cylindrical body part, and a bottom part, and at least one of the body part and the bottom part is provided with a reduced pressure absorption function part that exerts a reduced pressure absorption function during decompression of the housing. In a round enclosure,
The peripheral wall of the shoulder, the shoulder panels Five-triangular shape formed by chamfering the width decreasing upward so as to surround the periphery by the step portion, depression formed in parallel form in the circumferential direction, adjacent said shoulder panel The shoulder column part remains between,
In the longitudinal cross section of the shoulder panel formed in the depression, the step of the step at the lower end of the shoulder panel is made larger than the upper end.
It is said.

While the inventors of the present application have studied the further weight reduction of the housing, that is, the thinning of the peripheral wall, in the case of the thinning of the peripheral wall to a considerable extent, as the degree of decompression in the housing increases. It has been found that the peripheral wall of the tapered cylindrical shoulder portion is deformed in a substantially constant deformation mode. More specifically, it has been found that the peripheral wall of the shoulder part is deformed by depression in five places parallel in the circumferential direction, and when the peripheral wall of the shoulder part is viewed from the upper surface, it is deformed from a circular shape before the deformation into a pentagonal shape. .
Deformation of the peripheral wall of the shoulder portion during decompression, can proceed with locally recessed in parallel form a plurality of positions in the circumferential direction, deformed by the peripheral wall is an odd angle shape is stabilized. Since the amount of displacement is large, it is difficult to deform into a triangular shape, and as a result, it is assumed that the peripheral wall of the shoulder portion is often deformed into a pentagonal shape.

  The main configuration of the present invention was created in consideration of the deformation pattern of the peripheral wall of the shoulder during decompression, and five shoulder panels were previously formed in the peripheral wall of the shoulder in a recessed manner in parallel in the circumferential direction. By doing so, it is possible to make the depression deformation in the peripheral wall proceed smoothly and while maintaining a good appearance, and this shoulder panel has a function that complements the lack of decompression absorption function at the trunk and bottom. As a result, even in a small bottle, it is possible to exhibit a sufficient reduced pressure absorption function as the entire casing.

  Here, in consideration of the shape of the tapered cylindrical peripheral wall that is reduced in diameter toward the upper side of the shoulder portion, the shape of the shoulder panel is assumed to be a shape that is reduced in width toward the upper side.

  In the above configuration, the shape of the shoulder panel is determined in accordance with the deformation mode at the time of depressurization in the peripheral wall of the shoulder portion of the conventional case, and the depression deformation at the time of depressurization can proceed more smoothly.

In the longitudinal cross section of the shoulder panel formed as a depression of the main configuration of the present invention, the shoulder panel depression deformation at the time of decompression is increased by making the step of the step at the lower end of the shoulder panel larger than the upper end. Can be smoothly advanced from the lower end portion having a large step toward the upper end portion.

  Still another configuration of the present invention is the above-described main configuration, wherein a plurality of reduced pressure absorption panels are formed in a predetermined height range of the peripheral wall of the body portion so as to be surrounded by a stepped portion, and are recessed in parallel in the circumferential direction. This vacuum absorption panel is a vacuum absorption function unit.

According to still another configuration of the present invention, in the main configuration described above, a recessed portion formed by recessing the bottom wall upward and inward is disposed at the bottom portion, and the recessed portion serves as a decompression absorbing function portion. It is.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main structure of the present invention, five shoulder panels are preliminarily formed in parallel in the circumferential direction on the peripheral wall of the shoulder portion, so that the concavity deformation on the peripheral wall can be smoothly and satisfactorily performed. Can be advanced and stabilized while holding
The shoulder panel can exhibit a function of complementing the lack of the reduced pressure absorption function at the body and the bottom, so that a sufficient reduced pressure absorption function can be exhibited as a whole casing even in a small bottle.

It is a front view which shows 1st Example of the synthetic resin round casings of this invention. It is a top view of the housing of FIG. It is a longitudinal cross-sectional view of the shoulder part vicinity shown along the AA line in FIG. It is a front view which shows the housing of a comparative example. It is a top view of the housing of FIG. It is a front view which shows 2nd Example of the synthetic resin round-shaped housings of this invention. It is a front view which shows the example of the conventional round housing.

Hereinafter, it demonstrates along the Example according to this invention, referring drawings.
1 to 3 show a first embodiment of a synthetic resin round casing of the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a line AA in FIG. It is a longitudinal cross-sectional view of the shoulder panel vicinity shown along.
This housing 1 is a biaxially stretched blow molded product made of PET resin, and has a mouth tube portion 2, a tapered tube shoulder portion 3, a cylindrical body portion 4 and a bottom portion 5, and is a small size having a common capacity of 280 ml. This is a round bottle. The mouth tube portion 2 is in a state of being whitened by the thermal crystallization process.

A short cylindrical portion 7 is disposed at the upper end portion of the body portion 4 and a circumferential groove 6 is disposed at the lower end portion thereof. The short cylindrical portion 7 and the circumferential groove 6 are surrounded by a step portion 11 so as to be vertically long. Six rectangular decompression absorption panels 12 are formed to be recessed in parallel in the circumferential direction.
And the column part 13 which bears the rigidity and buckling strength of the housing 1 is left between the adjacent reduced pressure absorption panels 12.

In addition, the peripheral wall of the shoulder 3 has a shape that shrinks upward so as to surround the periphery with a stepped portion 15, and in this embodiment, five triangular shoulder panels 16 that are chamfered in the circumferential direction, etc. A depression is formed in parallel at the central angular position. Further, a shoulder column portion 17 is left between the adjacent shoulder panels 16.
The relative positions of the six decompression absorption panels 12 and the five shoulder panels 16 are not particularly limited, but in this embodiment, as seen in the front view of FIG. In addition, the position where one decompression absorption panel 12 is disposed and the position of one shoulder panel 16 are aligned with each other at the front face of the housing 1.

  Here, FIG. 3 is a longitudinal sectional view of the vicinity of the shoulder portion taken along the line AA in FIG. 1. As shown in FIG. The step D2 of the step 15 at the lower end of the panel 16 is made larger than the step D1 of the upper end. By configuring the step 15 in this manner, the depression deformation of the shoulder panel 16 during decompression can smoothly proceed from the lower end having a large step toward the upper end.

  4 and 5 show a casing 31 of a comparative example prepared for comparison with the casing 1 of the above embodiment. FIG. 4 is a front view and FIG. 5 is a plan view. The casing 31 has the same shape as the casing 1 of the embodiment shown in FIG. 1 except that the shoulder panel 16 is not formed.

Next, with respect to the round casings of these examples and comparative examples, after filling the content liquid at 90 ° C., it was cooled and the deformation state was seen as a reduced pressure state.
As a result, in the case 31 of the comparative example of FIGS. 4 and 5 in which the shoulder panel 16 is not depressed, the five regions F in the triangular or trapezoidal shape shown by hatching in FIGS. As a result, the peripheral wall of the shoulder portion 3 was deformed while the remaining pillar portion P was formed, resulting in poor appearance. (In the figure, the shapes of the five regions F are simply the same, but in reality the sizes are large, small, and distorted.)
Further, the most depressed portion of the depressed region F is a bent portion BL as shown in the figure, and the peripheral wall of the shoulder portion 3 is seen in a plan view by the five bent portions BL in FIG. As shown, it became a pentagon. Further, when the degree of decompression is large, these bent portions BL are plastically deformed in a depressed shape and cannot be restored to the original shape.

On the other hand, in the case 1 of the embodiment, the effect of the shoulder panel 16 is exhibited, and even if the degree of decompression increases, the depression deformation on the peripheral wall of the shoulder portion 3 proceeds smoothly while maintaining a good appearance and is stable. Can be
The depression deformation of the shoulder panel 16 can exhibit the function of complementing the shortage of the decompression absorption function of the decompression absorption panel 12, and can effectively suppress distortion deformation and plastic deformation in the peripheral wall of the shoulder portion 3. As a result, the casing 1 of the example exhibited a sufficient vacuum absorbing function as the casing 1 as a whole.
Here, the shape of the shoulder panel 16 of the housing 1 of the embodiment shown in FIGS. 1 to 3 is set so as to be similar to the shape of the region F shown in FIGS.

Next, FIG. 6 shows a second embodiment of the synthetic resin round casing of the present invention. In this example, a recessed portion 22 is formed in the bottom portion 5 and the recessed portion 22 is used as a vacuum absorbing function portion. is there.
This casing 1 is a biaxial stretch blow-molded product made of PET resin having a capacity of 280 ml, and the shapes of the mouth tube portion 2 and the shoulder portion 3 are shown in FIG. The shape is the same as that of the first embodiment.

The cylindrical body 4 is formed with three circumferential groove ribs 8 as one means for increasing the surface rigidity and buckling strength, and the body 4 has a high shape retention. A bottom 5 is connected to the lower end of the body 4.
An annular flat portion 21 for grounding is disposed on the peripheral edge of the bottom surface of the bottom portion 5, and a recessed recess 22 is formed inside the annular flat portion 21 by recessing the bottom wall upward and inward. Is arranged.

  In the case 1 of the present embodiment, when the internal pressure reduction degree increases, as shown by a two-dot chain line in the figure, the depressed concave portion 22 is further displaced upward in a depressed shape, and the reduced pressure absorption function is exhibited. However, even when the reduced pressure absorption function by the depressed recess 22 is not sufficient, the function of complementing the lack of the reduced pressure absorption function is exhibited by the shoulder panel 16 as in the case of the first embodiment. Distortion deformation and plastic deformation can be effectively suppressed, and as a result, the casing 1 as a whole exhibits a sufficient reduced pressure absorption function.

As mentioned above, although embodiment of this invention and its effect were demonstrated along the Example, this invention is not limited to this Example.
For example, the shape of the shoulder panel can be other shapes such as a trapezoidal shape within the category of reducing the width upward in addition to the triangular shape. It can be set as appropriate in consideration.
Further, in this embodiment, a relatively small casing of 280 ml has been described. However, while there is a strong demand for thinning, a 500 ml, 1 liter casing is sufficiently effective.

As described above, the synthetic resin round casing of the present invention allows the shoulder panel to exhibit the function of complementing the lack of the reduced pressure absorption function at the trunk and the bottom while reducing the thickness of the peripheral wall. In this case, the vacuum absorption function required for high-temperature filling applications as a whole is fully exhibited, and a wide range of application development in fields such as PET bottles is expected.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6; Circumferential groove 7; Short cylindrical part 8; Peripheral groove 11; Step part 12; 16; shoulder panel 17; shoulder column portion 21; annular flat portion 22; depressed recess 31; housing 101; housing 102; mouth tube portion 103; shoulder portion 104; trunk portion 105; 112; Vacuum absorbing panel 113; Column
F: Depression area BL: Bending part P: Remaining pillar part

Claims (3)

It has a mouth tube (2), a tapered tube shoulder (3), a cylindrical body (4), and a bottom (5), and at least one of the body (4) and the bottom (5). In a round housing with a reduced pressure absorption function part that exerts a reduced pressure absorption function during decompression in the housing,
The peripheral wall of the shoulder portion (3), surrounding the stepped portion (15) so as to surround at 5 shoulder panels (16) of the chamfering the triangular shape width decreasing upward and Ke, parallel form in the circumferential direction Forming a depression, forming a shoulder column portion (17) between the adjacent shoulder panels (16),
In the longitudinal section of the shoulder panel (16) formed in the depression, a round shape made of synthetic resin, characterized in that the step of the step (15) at the lower end of the shoulder panel (16) is larger than the upper end. Body. A plurality of reduced pressure absorption panels (12) are formed in a predetermined height range of the peripheral wall of the trunk portion (4) so as to surround the periphery with a stepped portion (11), and are formed in parallel in the circumferential direction. (12) a reduced pressure-absorbing function unit and claims 1 Symbol placement synthetic resin round bottle body. The bottom (5), the bottom wall upwardly, and disposed recessed recess (22) which is formed by recessed inwardly, synthetic resins of claim 1 Symbol mounting the該陥deaths recess (22) was vacuum absorption function portion Round frame.

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