JP6504741B2 - Plastic round body - Google Patents

Description

The present invention relates to a synthetic resin round casing made of a large number of circumferential groove ribs provided on a body portion to impart high shape retention.

Conventionally, a biaxial stretch blow molded housing made of polyethylene terephthalate (hereinafter referred to as PET) resin, a so-called plastic bottle, has excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and is used for various beverages. It is widely used as a container.
Also, as a method for filling contents liquid such as fruit juice beverage, tea, etc. requiring sterilization into a plastic bottle, there is a method called so-called high temperature filling, and the contents liquid is filled into a container at a temperature around 90 ° C. After sealing with a cap, it is cooled and the pressure inside the case is considerably reduced.

  For this reason, for applications involving high temperature filling as described above, a so-called reduced pressure absorption panel is formed in the trunk, which is an area that is easily deformed in a depressed manner by reduced pressure intentionally, and this reduced pressure absorption panel is By deforming into a depressed shape, a good appearance can be maintained, and rigidity as a housing can be secured in portions other than the decompression absorption panel, and there are no problems in the transportation line of the housing, storage in storage, inside of a vending machine, etc. The so-called reduced pressure absorption function is to be exhibited.

On the other hand, there is a risk of bulging deformation due to the pressure inside the casing in the use of carbonated drinking water and carbonated drinking water of slightly carbonated drinking water due to the design requirement concerning the appearance of the casing, and it is necessary to form a decompression absorption panel. There is a need to avoid.
Patent Document 1 describes an invention relating to a round casing in which the body is cylindrical, and this round casing has a large number of circumferential groove ribs disposed on the peripheral wall of the body, and It is intended to suppress the deformation of the peripheral wall in the depressurized state by increasing the surface rigidity of the body wall by providing the groove rib and imparting high shape retention to the body.

Furthermore, the invention which concerns on the round frame which arrange | positioned several circumferential groove rib in the peripheral wall of the trunk | drum like patent document 2 in patent document 2 is described, This housing is a housing at the time of pressure reduction. In the inward direction of the housing, it is possible to arrange a depressed recess which is formed by indenting the bottom wall of the bottom portion in the inward direction of the casing.

Unexamined-Japanese-Patent No. 2003-285814 JP, 2010-126184, A

Here, in recent years, it is required to reduce the thickness of the peripheral wall of the housing from the viewpoint of saving resources and material costs, but if it is intended to further reduce the thickness of the peripheral wall, the rounds described in Patent Documents 1 and 2 are required. Even in the case of a molded body, in applications where the degree of pressure reduction is large, there is a limit to the shape retention of the shape of the body against pressure reduction by the circumferential groove rib, and therefore not only the pressure reduction absorption function by the bottom described in Patent Document 2
Also in the trunk portion, it is necessary to further exhibit the pressure reduction absorption function while securing the shape retaining property of the trunk portion shape by the circumferential groove rib.

In order to solve the problems in the prior art described above, the present invention provides a pressure-reducing and absorbing function in a round casing provided with a large number of circumferential groove ribs on the peripheral wall of the body to impart high shape retention of the body. It is an object of the present invention to create a peripheral wall structure of a body that can be

Among the means for solving the above-mentioned problems, the main constitution of the present invention resides in a synthetic resin round casing having a cylindrical body,
A plurality of corrugated circumferential groove ribs whose positions in the vertical direction periodically change in a wave shape along the circumferential direction are disposed in parallel on the trunk portion,
By combining the corrugations of the vertically adjacent wave circumferential groove ribs and the arrangement positions in the circumferential direction, the vertical width of the circumferential wall between the ribs which is the circumferential wall portion located between the vertically adjacent wave circumferential groove ribs, While having a configuration in which the narrowest portion which is the shortest and the widest portion which is the longest are alternately and periodically arranged,
The narrowest portion and longitudinal section straight bar portion, a longitudinal section concave that depressed toward the inside of the bottle than the narrowest portion of the waveform peripheral grooves ribs positioned the widest portion in the vertical as base, one 且 The configuration has a recess depth that gradually decreases from the widest part to the narrowest part located on the left and right,
Furthermore, it is said that the area divided and formed in the circumferential direction at the narrowest portion of the circumferential wall between the ribs can be reduced in pressure and absorbed.

According to the configuration of the housing, the longitudinal cross-sectional shape of the inter-rib peripheral wall is a concave shape that is recessed toward the inside of the housing with the corrugated circumferential groove rib located at the top and bottom at the widest portion as the base end. By decreasing the depression depth gradually from the part toward the narrowest part located to the left and right, and making the linear part in the narrowest part,
In the inter-rib peripheral wall, a plurality of narrowest portions periodically located in the circumferential direction have a narrow width and a linear longitudinal cross-sectional shape, thereby exerting a function as a pillar.

Then, when the casing is in a depressurized state, the peripheral wall portion in a state of being surrounded by the narrowest portion that exhibits the function as the corrugated circumferential groove rib positioned vertically and the pillar portion positioned horizontally, ie, In the peripheral wall portion (hereinafter, the peripheral wall portion will be referred to as a panel portion) divided in the narrowest portion adjacent to each other between the ribs (the peripheral wall portion is referred to as a panel portion) Starting from the part, the depression-like deformation can smoothly progress toward the narrowest part forming the left and right end parts of the panel part.
And since this panel part is surrounded by the waveform circumferential groove rib located up and down and the narrowest part which exhibits a function as a pillar part located right and left, it is possible to suppress the progress of depression deformation beyond the panel part Since it is possible to suppress the distorted deformation of the entire casing, it is possible to exhibit the function as a reduced pressure absorption panel by this panel portion.

  Here, in order to indicate the positional relationship and directionality in the peripheral wall of the body of the body in the above main configuration and the following description, the terms top and bottom, top and bottom direction, and left and right are used. These show the positional relationship in the upper and lower direction in the state which erected the housing, and directivity, and the left and right show the positional relationship in the circumferential direction in the state which erected the housing similarly.

  According to another configuration of the present invention, in the above main configuration, the vertically adjacent corrugated circumferential groove ribs have the same sinusoidal waveform, and are disposed with a phase difference in the circumferential direction. It is a thing.

The above configuration relates to a typical example of the waveform of the corrugated circumferential groove rib, and according to the above configuration, the narrowest portion and the widest portion can be alternately disposed at equal central angles, and have the same shape. The panel portion can be disposed at an equal central angle, and the widest portion formed in a depressed shape in each panel portion is located at the left-right center position between the narrowest portions adjacent in the left-right direction. The depression and deformation can smoothly progress to the left and right ends from the center of the left and right of the panel portion, and the pressure reduction absorption function can be effectively exhibited.
Here, when there is no phase difference, that is, when the ridges or valleys of the upper and lower wavy circumferential groove ribs are disposed at the same central angular position, the width in the vertical direction of the circumferential wall between ribs is constant in the circumferential direction The narrowest portion and the widest portion can be alternately disposed at equal central angles by providing a phase difference, that is, shifting the central angular position of the peaks or valleys.

  According to still another configuration of the present invention, in the above main configuration, the position of the bottom of the corrugated circumferential groove rib located on the upper part and the position of the top of the corrugated circumferential groove rib located on the lower part form the rib circumferential wall. And so on.

According to the above configuration, the corrugated circumferential groove rib does not exist in the flat cross section in the vicinity of the central portion in the vertical direction of the inter-rib circumferential wall, and hence the depressed deformation starting from the widest portion in the panel portion is the presence of the corrugated circumferential groove rib without being obstructed, it becomes possible to advance to smoothly toward the narrowest portion positioned on the left and right ends.

  In still another configuration of the present invention, in the main configuration described above, the bottom wall of the bottom portion is provided with a recessed recess formed by sinking in the inner direction of the housing so as to allow recess deformation toward the inner side of the housing at the time of pressure reduction. It is said to have a configuration to be provided.

According to the above configuration, the reduced pressure absorbing function by the panel unit and the reduced pressure absorbing function at the bottom unit combine, and sufficient reduced pressure absorption is achieved even in the round casing provided with high shape retention of the body by a large number of circumferential groove ribs. It becomes possible to exhibit the function.

Since the present invention is configured as described above, the following effects can be obtained.
That is, when the casing is in a depressurized state, the left and right sides of the panel portion surrounded by the narrowest portion which exhibits the function as the corrugated circumferential groove rib positioned vertically and the pillar portion positioned horizontally The depression-like deformation can be smoothly progressed toward the left and right end parts of the panel part from the widest part formed in the depression-like shape located in the central part as a starting point.
And since the panel part is surrounded by the corrugated circumferential groove rib located up and down and the narrowest part which exerts a function as a pillar part located right and left, it is suppressed that the depression deformation advances beyond the panel part Since the distortion deformation as the whole housing can be suppressed, it becomes possible to exhibit the function as a decompression absorption panel highly by this panel part.

It is a front view showing one example of a case of the present invention. It is a bottom view of the case of FIG. It is a front view which expands and shows the waveform circumferential groove rib vicinity which adjoins the upper and lower sides in FIG. (A) is a longitudinal cross-sectional view of the narrowest part in FIG. 3, (b) is a widest part. It is a schematic explanatory drawing which shows the aspect of depression deformation at the time of pressure reduction of the panel part in FIG. It is explanatory drawing which shows the arrangement | positioning aspect over the perimeter of the wave-form circumferential groove rib adjacent to the upper and lower sides in FIG. 3 with an expanded view.

Hereinafter, embodiments of the present invention will be described along the examples with reference to the drawings.
1 to 6 are for explaining one embodiment of the synthetic resin round casing according to the present invention, FIG. 1 is a front view, FIG. 2 is a bottom view, and FIG. It is a front view which expands and shows the vicinity of adjacent waveform circumferential groove rib 7b, 7c.
The casing 1 is a biaxially stretched blow molded article of PET resin having a mouth cylinder 2, a shoulder 3, a cylindrical body 4, and a bottom 5 and having a volume of 550 ml.

  The bottom wall 6 of the bottom portion 5 is provided with a depressed recess 6b formed by being depressed in the inner direction of the casing 1 with the ground portion 6a located at the peripheral edge as a base end. When the inside of the housing 1 is in a pressure-reduced state, the recessed recess 6b is further deformed in the inward direction of the housing 1 as indicated by a two-dot chain line in FIG. (See Figures 1 and 2)

Further, an upper circumferential groove rib 9a, a waist groove rib 9w, and a lower circumferential groove rib 9b are provided around the upper side, the central portion, and the lower end portion of the body 4, respectively.
In addition, between the upper circumferential groove rib 9a and the waist groove rib 9w, the wavy circumferential groove rib 7 (7a, 7b, 7c) whose position in the vertical direction periodically changes in a wave shape along the circumferential direction is vertically shifted. Three wave-shaped circumferential groove ribs 7 (7d, 7e, 7f) are similarly arranged in parallel between the waist groove rib 9w and the lower circumferential groove rib 9b. It is set up.

The upper peripheral groove rib 9a, West groove rib 9w, lower peripheral groove ribs 9b, element six Ke waveform circumferential groove ribs 7 are both the barrel cylindrical by increasing the surface rigidity of the body portion 4 It exerts the function of providing high shape retention.
The waveform of the six circumferential grooves 7 is a sine wave having a wave number of 4 and the same amplitude and the same waveform, but the circumferential grooves 7A and 7B disposed in the upper half of the body 4 , And 7C are arranged in one set with a phase difference (in the present embodiment, a phase difference of a center angle of 11.25 °).
Further, the three corrugated circumferential groove ribs 7D, 7E, 7F disposed in the lower half of the body portion are similarly arranged in a set with a phase difference therebetween.

The details of the configuration of the wavy peripheral groove ribs 7a, 7b and 7c and the function and effect will be described below, but the same configuration and functional effect can be obtained for the corrugated peripheral groove ribs 7d, 7e and 7f.
The inter-rib peripheral wall 13 is partitioned between the corrugated circumferential groove ribs 7 vertically adjacent to each other, but the inter-rib peripheral wall 13ab is partitioned and formed by the corrugated circumferential groove ribs 7a and 7b among the corrugated circumferential groove ribs 7a, 7b and 7c. The inter-rib peripheral wall 13bc is defined by the corrugated circumferential groove ribs 7b and 7c. (See Figure 1)
FIG. 3 is an enlarged front view showing the vicinity of the corrugated circumferential groove ribs 7b and 7c in FIG. 1; however, as described above, the corrugated circumferential groove ribs 7b and 7c should be 11 relative to the central axis of the housing. By arranging with a phase difference of 25 °, the width in the vertical direction of the inter-rib peripheral wall 13bc formed in a wave band as shown in FIG. 3 changes along the circumferential direction.
Further, since the wave number of the waveform of the corrugated circumferential groove ribs 7b and 7c is 4, the central angle (45 in the present embodiment) is equal to the narrowest narrow portion 8a having the narrowest width and the widest portion 8b having the widest width. Is arranged periodically, and the width of the inter-rib peripheral wall 13 gradually increases in the region from the narrowest narrowest portion 8a to the widest widest portion 8b.

Here, FIG. 4 (a) shows the longitudinal cross sectional shape of the inter-rib peripheral wall 13bc in the narrowest portion 8a in FIG. 3 and FIG. 8 (b) in the widest portion 8b.
As shown here, the longitudinal cross-sectional shape of the narrowest portion 8a is linear, and the longitudinal cross-sectional shape of the widest portion 8b is a concave shape that is recessed toward the inside of the casing 1, from the widest portion 8b to the left and right The depression depth d is gradually reduced toward the narrowest portion 8a located at the
In the present embodiment, the depression depth d at the center in the vertical direction of the widest portion 8b is 0.5 mm.

Then, by forming the longitudinal cross-sectional shape from the widest portion 8b to the narrowest portion 8a as described above, it is possible that the narrowest portion 8a has a narrow width and a linear longitudinal shape. Function as the pillars of the inter-rib circumferential wall 13bc,
The region surrounded by the corrugated circumferential groove ribs 7b and 7c located vertically adjacent to each other and the narrowest portion 8a that exerts a function as a pillar portion located to the left and right, that is, the inter-rib circumferential wall 13bc in the circumferential direction by the narrowest portion 8a The panel portion 13 p (a cross-hatch of one of the panel portions 13 p is shown in FIG. 3), which is an area divided into two sections, functions as a reduced pressure absorption panel.

More specifically, when the inside of the housing 1 is in a depressurized state, the depression-like deformation is performed starting from the widest part 8b formed in the depression-like shape, and functions as a column located at both left and right ends Can be smoothly advanced toward the narrowest portion 8a.
And since this panel portion 13p is surrounded by the corrugated circumferential groove ribs 7b, 7c and the narrowest portion 8a which exhibits a function as a pillar portion, it is suppressed that the depression deformation is advanced beyond the panel portion 13p. Since the distortion deformation as the whole housing 1 can be suppressed, the function as a decompression absorption panel can be exhibited at a high level by this panel portion 13.

  In addition, although the area | region Fa shown by two broken lines in rib inter-rib peripheral wall 13bc in FIG. 3 is an area | region in which waveform circumferential groove rib 7b, 7c is not arrange | positioned, with the position of valley bottom 7bv of waveform circumferential groove rib 7b The recess-like deformation starting from the widest portion 8b is obtained by sufficiently separating the position 7 cm of the top of the corrugated circumferential groove rib 7c in the vertical direction from the top, and the corrugated circumferential groove rib 7b, It can be made to progress to the narrowest part 8a located in right-and-left both ends more smoothly, without being disturbed by existence of 7c.

  FIG. 5 is a schematic explanatory view showing an aspect of the depression deformation at the time of pressure reduction of the panel portion 13p shown by cross hatching in FIG. 3 and showing the shape of the panel portion 13p in a plane cross section As shown in this figure, the panel portion 13p is recessed from the cylindrical peripheral wall at the position of the widest portion 8b, and as described above when the inside of the housing 1 is in a depressurized state, Starting from the widest part 8b, the depression deformation progresses toward the narrowest part 8a located at both ends of the panel 13p as shown by a two-dot chain line.

Here, FIG. 6 is an explanatory view showing, in a developed view, an arrangement mode over the entire circumference of the corrugated circumferential groove ribs 7b and 7c adjacent to the upper and lower sides in FIG. In the figure, a spread angle of 0 ° corresponds to the direct front of the housing 1 of FIG. 1, and + 180 ° and -180 ° to the back surface.
As shown in this figure, four narrowest portions 8a and four widest portions 8b are alternately arranged at an interval of 45 °.
In this figure, the panel portion 13p, which is indicated by cross hatching in FIG. 3, is also indicated by cross hatching, but when looking at the entire circumference, the inter-rib peripheral wall 13bc has four panel portions by the four narrowest portions 8a. It is divided into 13p.
And in this embodiment, the phase difference p between the corrugated circumferential groove rib 7b and the corrugated circumferential groove rib 7c (shown by the deviation of the top 7bm of the corrugated circumferential groove rib 7b and the top 7 cm of the corrugated circumferential groove rib 7c in the figure) In the example, as described above, it is 11.25 °.

Then, a total of four inter-rib peripheral walls 13 are defined by the two corrugated peripheral groove ribs 7d, 7e, 7f by the corrugated peripheral groove ribs 7a, 7b, 7c, and four panels are formed on the respective inter-rib peripheral walls 13 Since the portion 13p is divided and formed, a total of 16 panel portions 13p are disposed on the peripheral wall in the entire trunk portion, and in the case 1 of the present embodiment, pressure reduction by the large number of panel portions 13p The absorption function and the reduced pressure absorption function at the bottom portion 5 combine to make it possible to exhibit a sufficient reduced pressure absorption function even in a round case in which the body portion 4 is provided with high shape retentivity by a large number of circumferential groove ribs.
Of course, depending on the application, the pressure reducing absorption function can be exhibited by only the panel portion 13p without arranging the pressure reducing absorption function in the bottom portion 5.

As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.
A variety of variations can be assumed for the waveform including the wave number and amplitude of each of the corrugated circumferential groove ribs and the arrangement of the plurality of corrugated circumferential groove ribs, and the width of the inter-rib circumferential wall (13) in the vertical direction can be assumed. Of the narrowest narrowest part (8a) and the widest widest part (8b) are alternately and periodically arranged in a periodic manner. It can be appropriately selected from various variations in consideration of the appearance design.
In the above example, the bottle is a PET bottle made of a biaxially stretched blow molded bottle made of PET resin having a volume of 550 ml, but the type and molding method of the synthetic resin used and the volume of the bottle are particularly limited. It is not something that can be selected appropriately according to the purpose of use.

The plastic-made resin round rod of the present invention is a round rod in which a large number of circumferential groove ribs are disposed, and the peripheral wall of the body can exhibit a reduced pressure absorbing function, and high temperature filling is required. Further development of the use of round rods in the bottle field etc.

DESCRIPTION OF SYMBOLS 1; Body 2; Mouth cylinder part 3 Shoulder part 4 Body part 5 Bottom part 6 Bottom face wall 6a Grounding part 6b Recessed recessed part 7 (7a, 7b, 7c, 7d, 7e, 7f); Groove rib 7bm, 7cm; top 7bv; valley bottom 8a; narrowest portion 8b; widest portion 9a; upper circumferential groove rib 9b; lower circumferential groove rib 9w; waist groove rib 13; interrib circumferential wall 13p; panel portion d; P; phase difference

Claims (5)

A plastic round body having a cylindrical body portion (4), wherein
A plurality of corrugated circumferential groove ribs (7) whose positions in the vertical direction periodically change in a wave shape along the circumferential direction are disposed in parallel in the vertical direction on the body portion (4),
Between the rib which is a peripheral wall portion located between the vertically adjacent corrugated circumferential groove ribs (7) by a combination of the waveform of the corrugated circumferential groove ribs (7) vertically adjacent to each other and the arrangement position in the circumferential direction With respect to the vertical width of the peripheral wall (13), the narrowest narrowest portion (8a) and the widest widest portion (8b) are alternately and periodically arranged.
The narrowest portion (8a) and longitudinal section straight bar portion, the bottle than the narrowest portion widest portion waveform circumferential groove rib position (8b) vertically (7) as a base (8a) a longitudinal section concave that depressed toward the inside of the body, and configured to include 且 one said recessed depth that gradually decreases toward the narrowest portion positioned to the left and right from the widest portion (8b) (8a) to (d),
Further, a synthetic resin round rod is characterized in that a region partitioned and formed in the circumferential direction by the narrowest portion (8a) of the rib peripheral wall (13) can be decompressed and absorbed.   The synthetic resin round rod according to claim 1, wherein the corrugated circumferential groove ribs (7) vertically adjacent to each other have the same sinusoidal waveform, and they are disposed with a phase difference in the circumferential direction.   The position of the valley bottom of the corrugated circumferential groove rib (7) located above and the position of the top of the corrugated circumferential groove rib (7) located below, which form the inter-rib circumferential wall (13), are mutually separated in the vertical direction The plastic-made round container according to claim 1 or 2, which is configured.   In the bottom wall (6) of the bottom portion (5), a recessed recess (6b) formed by sinking in the inner direction of the housing is provided so as to allow deformation toward the inside of the housing at the time of depressurization. A synthetic resin round rod according to claim 1, 2 or 3.   The synthetic resin circle according to claim 1, 2, 3 or 4, wherein the area which is sectioned in the circumferential direction by the narrowest portion (8a) of the rib peripheral wall (13) and which can be reduced in pressure is a panel portion (13p). Body.

Images