JP6341428B2 - Synthetic resin round frame - Google Patents

Description

The present invention relates to a synthetic resin round casing for high-temperature filling that absorbs the reduced pressure without disposing a reduced pressure absorption panel in the body when the inside is in a reduced pressure state.

  Conventionally, polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded casings, so-called PET bottles, have excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and are used for various beverages. Widely used as a container. Conventionally, there is a so-called high-temperature filling method for filling a PET bottle with content liquids such as fruit juices and teas that require sterilization, and the liquid content is filled into the casing at a temperature of about 90 ° C. Then, 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, for example, as described in Patent Document 1, a so-called decompression absorption panel, which is an area where the body portion is easily deformed in a depressed state by intentional decompression, is used. By disposing and deforming this vacuum absorption panel into a depressed shape at the time of decompression, while maintaining a good appearance, it is possible to secure rigidity as a housing in parts other than the vacuum absorption panel, and transport the housing A so-called decompression absorption function is exhibited so as to prevent troubles in the line, stacked storage, vending machines and the like.

  On the other hand, as described in Patent Document 2, there is a synthetic resin casing made to exhibit a reduced pressure absorption function by a depression-like deformation of the bottom wall of the bottom without forming a reduced pressure absorption panel in the body portion, Such a housing has a design advantage that can smooth the appearance of the body, and even when a shrink label is installed, it can suppress the generation of wrinkles and uneven expansion and contraction on the label, and it has a clean appearance. It can be made to present.

Here, the casing 101 shown in FIG. 9 is an example of a synthetic resin casing that exhibits a reduced pressure absorption function due to the depression-like deformation of the bottom wall of the bottom 105, (a) is a front view, (B) is a bottom view.
In this casing 101, a plurality of circumferential groove ribs 107 are arranged on the peripheral wall of the trunk portion 104, thereby increasing the surface rigidity of the peripheral wall of the trunk portion 104, and when the internal pressure is reduced, the trunk portion 104 is provided. While maintaining this shape, the reduced pressure absorbing function is exhibited by further deformed deformation (deformation in the direction of the arrow in FIG. 9A) of the depressed recess 115 of the bottom 105.

Japanese Patent Laid-Open No. 08-048322 JP 2007-269392 A

  However, the housing 101 of the type shown in FIG. 9 is also required to reduce the thickness of the housing in order to save resources and reduce costs. As the further depression-like deformation progresses, the depression deformation in the depression 115 does not progress uniformly over the entire circumference, and as shown in the bottom view of FIG. While forming a number of folds V, the folds V are unevenly advanced, and the folds V are advanced to a peripheral portion 112 that is disposed on the peripheral portion of the bottom portion 105 and functions as a grounding portion. There is a problem that it results in a loss of self-sustainability of the casing 101.

  Further, as described above, the casing 101 of the type shown in FIG. 9 is provided with a plurality of circumferential groove ribs 107 on the peripheral wall of the trunk portion 104, thereby increasing the surface rigidity of the peripheral wall of the trunk portion 104. In addition, since the decompression absorption function due to the depression-like deformation of the peripheral wall of the body portion 104 cannot be expected, when the degree of decompression increases in applications that require high-temperature filling, the decompression absorption function due to the depression-like deformation of the bottom wall is not sufficient. For example, there is a problem that a portion from the tapered cylindrical shoulder portion 103 to the upper end portion of the body portion 104 is locally depressed and deformed.

Therefore, the present invention eliminates the above-described problems in the prior art by using a synthetic resin round casing for high-temperature filling in which the surface rigidity of the peripheral wall of the body portion is increased without providing a vacuum absorbing panel. It is possible to cause the bottom wall surface of the bottom part to be deformed without increasing the degree of independence of the case, and to fully exhibit the vacuum absorption function as a whole of the case, including the deformation of the bottom wall surface. The challenge is to create a possible frame structure.

Of the means for solving the above problems, the main configuration of the present invention is as follows.
In a synthetic resin round casing for high temperature filling that is biaxially stretch blow molded and has a cylindrical body, a plurality of circumferential grooves are disposed on the peripheral wall of the body,
On the bottom surface of the bottom portion, a ridge that functions as a grounding portion formed by projecting the bottom wall downward from the rim portion is disposed on the inner side of the rim portion, and the inner side of the ridge is disposed on the center portion. As a base end, a recessed recess formed by recessing the bottom wall upward and inward through a stepped portion formed in a reduced diameter is disposed, and as the degree of decompression inside the housing increases, and shortening of the height of the body with the compression-shaped deformation of the groove, due to deformation such that extension of the ridges, vacuum absorption function by the upper displacement recess shaped depressions deformation of toward depressed recess from ridge together but is exhibited, Ri configuration der the periphery instead of the protrusions to function as a ground portion,
The depressed deformation portion is composed of the protrusion, a stepped portion formed in the reduced diameter, and a depressed recess.
The circumferential groove can be elastically compressed and deformed in the longitudinal direction by the action of the longitudinal pressing force accompanying the increase in the degree of decompression inside the housing. Is 2 mm or more,
The configuration is such that the angle of inclination of the side wall of the circumferential groove from the horizontal direction is 45 ° or less .

An unprecedented feature of the above-structured housing is
At the bottom surface of the bottom portion, a protrusion is provided to project downward between the recessed portion provided at the peripheral portion and the central portion, and the circumferential groove provided on the peripheral wall of the trunk portion is provided with a degree of decompression inside the housing. Along with the rise, it can be compressed in the vertical direction, and when the degree of decompression inside the housing is increased by cooling after the high-temperature filling process , the bottom wall is depressed and the circumferential groove is compressed. Combined with the shortening of the height of the body part, sufficient vacuum absorption function is fully demonstrated, and the peripheral part replaces the ridges and functions as a grounding part, making the body self-supporting The point is to ensure that it is maintained.

  Here, before the bottom wall portion from the ridge to the depressed recess (hereinafter sometimes referred to as a depressed deformed portion) is displaced upward due to reduced pressure, the ridge is configured to exhibit the function as a grounding portion. In the state in which the depressed deformed portion is displaced upward due to the reduced pressure and the tip portion from which the protrusion protrudes is displaced above the peripheral portion, the peripheral portion functions as a grounding portion. In this way, by sharing the function of the grounding portion between the ridge and the peripheral portion, the ridge can be sufficiently displaced upward without deteriorating the independence of the housing during decompression. Further, the depression-like upward displacement of the bottom wall from the ridge to the depression recess, that is, the reduced pressure absorption function is obtained by the extension deformation of the ridge.

In addition, the vacuum absorption function at the bottom can be increased by thinning the bottom wall, but on the other hand, when the wall is thinned, the so-called bottom-down problem and the bottom grounding function in the high-temperature filling process are reduced. In some cases, it may be difficult to demonstrate the vacuum absorption function required only at the bottom, but according to the above configuration, the vacuum absorption function is achieved by shortening the height of the trunk. It becomes possible to supplement with.
From a different perspective, it can be said that the degree of freedom in shape design including the thickness of the bottom can be increased by the complementary function by shortening the height of the body.

  In addition, the longitudinal cross-sectional shape including the groove width, groove depth, etc. of the circumferential groove, the arrangement position and the number of arrangements, etc. are the appearance design, the required vacuum absorption function, the surface of the body part by the circumferential groove It can be set appropriately in consideration of the reinforcing effect related to rigidity and the degree of reduction in the buckling strength in the vertical direction due to the arrangement of the circumferential groove. Of course, if the number of arrangements is increased, the reduced pressure absorption function can be exhibited.

According to another configuration of the present invention, in the main configuration described above, the peripheral groove has a peripheral wall that can be elastically compressed and deformed in the vertical direction by the action of the vertical pressing force accompanying an increase in the degree of decompression inside the housing. and bending song trapezoidal when viewed in longitudinal section, in which the groove depth be at least 2 mm, and referred.

Yet another aspect of the present invention, in the above-mentioned main component, the inclination angle from the horizontal groove side walls of the circumferential groove, Ru der 45 ° or less, in which say.
The inclination angle is 0 ° or more.

The ease of elastic compression deformation in the longitudinal direction of the circumferential groove due to the action of the vertical pressing force depends on the wall thickness of the circumferential wall and the longitudinal sectional shape of the circumferential groove (groove width, groove depth, groove side wall The inclination angle from the horizontal direction, etc.) can be set as appropriate, but by setting the groove depth to 2 mm or more with the above configuration, and by setting the inclination angle of the groove sidewall from the horizontal direction to 45 ° or less, The circumferential groove can be smoothly deformed in the longitudinal direction in a compressed state by the progress of the degree of decompression in the casing accompanying the cooling of the content liquid after the high temperature filling step , and the decompression absorption function can be exhibited smoothly.

Another structure of the present invention, in the above-mentioned main constituent, the peripheral portion, Ru inclined planar der inclined obliquely upward toward the center axis of the bottle, in which say.

In the high-temperature filling step, the case having the above-described structure is considered to be that immediately after the high-temperature content liquid is filled and sealed with a cap, the synthetic resin forming the case is softened and the case is in a pressurized state. Thus, the problem that the bottom wall of the housing is deformed in a bulging shape downward, that is, the so-called bottom falling phenomenon is effectively suppressed.
And by making the peripheral part into the inclined surface shape inclined obliquely upward toward the central axis direction of the casing by the above configuration, the bottom-down phenomenon can be effectively suppressed, and then the casing is When the decompressed state is caused by the cooling of the content liquid, the depressed deformed portion is uniformly displaced upward in a depressed shape, and the reduced pressure absorption function can be exhibited smoothly, and sufficient independence by the peripheral edge portion can be ensured.

Yet another aspect of the present invention, depression recess, Ru flat sectional shape der varying from a circular neighborhood Chuo portion to the equilateral triangular base end portion, in which say.

  With the above configuration, the formation of the folds at the depression deformed portion at the time of decompression can be specified in a flat cross-sectional shape and dispersed in the direction in which the apex of the equilateral triangle is located, and the formation of the folds at the annular flat portion can be more It can be effectively suppressed. In addition, since the depression-like deformation mode can be controlled, it is possible to exhibit a constant reduced pressure absorption function more stably.

Yet another aspect of the present invention, the inner and outer circumferential edge boundary portion of the projection of the periphery, the bottom wall upwardly, is Ru is disposed inward in the groove-like recess formed by recessed stepped, It is said.

  With the above-described configuration, the depression-like upward displacement of the depression-deformed portion in the decompressed state can be smoothly advanced from the groove-like depression as a starting point, and the deformation as a peripheral portion can be suppressed to function as the ground-contact portion of the marginal portion. Can be exhibited stably.

Since the synthetic resin casing for high-temperature filling according to the present invention has the above-described configuration, the following effects are exhibited.
In the main structure of the present invention, when the decompression degree inside the housing is increased by cooling of the content liquid after filling, the body portion is caused by the depression deformation of the bottom wall and the compression deformation of the circumferential groove. Combined with the shortening of the height dimension, sufficient decompression absorption function is fully demonstrated, and the peripheral part functions as a grounding part instead of a ridge, ensuring the independence of the frame Maintained.

It is a front view which shows 1st Example of the housing of this invention. It is a bottom view of the housing of FIG. It is an outer contour line figure of a peripheral wall which shows a peripheral groove neighborhood of a case of Drawing 1 by carrying out a longitudinal section. FIG. 3 is an enlarged longitudinal sectional view taken along the line AA in FIG. 2, enlarging the vicinity of the bottom of the housing of FIG. It is a front view which shows 2nd Example of the housing of this invention. It is a bottom view of the housing of FIG. (A) is the longitudinal cross-sectional view of the peripheral part of the bottom part shown along the BB line in FIG. 6 of the housing of FIG. 5, and the vicinity of a protrusion, (b) is about the housing for a comparison ( It is a longitudinal cross-sectional view shown similarly to a). It is a bottom view which shows the other example of the shape of a bottom part. (A) which shows the housing of a prior art example is a front view, (b) is a bottom view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 to 4 show a first embodiment of a synthetic resin casing for high-temperature filling according to the present invention. FIG. 1 is a front view, FIG. 2 is a bottom view, and FIG. FIG. 4 is an enlarged vertical sectional view taken along the line AA in FIG. 2, showing the vicinity of the bottom 5. This housing 1 is a round housing having a mouth tube portion 2, a shoulder portion 3, a cylindrical body portion 4 and a bottom portion 5. The body portion 4 has a maximum diameter of 66 mm, an overall height of 134 mm, and a capacity of 280 ml. A biaxial stretch blow molded product made of PET resin.

  As shown in FIG. 3, the peripheral wall 4a of the body part 4 is provided with four peripheral grooves 6 having a concave cross-sectional shape by bending the peripheral wall 4a. The cross-sectional shape of the circumferential groove 6 is trapezoidal, the groove depth D of the circumferential groove 6 is 5 mm, the groove width Wct at the groove upper end 6a is 5 mm, the groove width Wcb at the groove bottom 6c is 1.75 mm, and the groove side wall The inclination angle A from the horizontal direction of 6b is 20 °.

A bottom portion 5 is connected to the lower end of the body portion 4 via a heel wall portion 11 formed in a curved cylindrical shape. A peripheral edge portion 12 of the bottom surface of the bottom portion 5 is an annular flat portion 12a. Further, on the inner side of the peripheral edge portion 12, a circumferential ridge 13a continuously extending in the circumferential direction is provided as a ridge 13 that functions as a grounding portion formed by projecting the bottom wall downward from the annular flat portion 12a. In the central portion, a concave recess 15 formed by recessing the bottom wall upward and inward via a stepped portion 15s formed in a reduced diameter with the inner side of the circumferential protrusion 13a as a base end is disposed. I try to set it up. Also arranged a groove-like recess 17 which is formed by recessed and bottom wall upwardly, inwardly stepwise on the inner circumference and the circumferential ridge 13 a peripheral edge boundary portion of the peripheral portion 12.

The circumferential ridge 13a is formed of a pair of side walls 13s and a flat tip flat portion 13t, and its cross-sectional shape is trapezoidal (can be U-shaped). The protruding height H from the portion 12a is 2 mm, and the width W of the tip flat portion 13t is 6 mm. Further, the shape of the depressed recess 15 is such that its flat cross-sectional shape gradually changes from a circle near the center to a regular triangle at the base end. Here, in the case of the ground portion of the circumferential ridge 13 a as described above, but reduced autonomy compared is concerned in the case of the peripheral portion 12 and the ground portion, the circumferential ridge 13 a Considering the installation position, the projection height is within a predetermined range, so that the annular flat portion 12a, which is the peripheral portion 12, hits the grounded surface even when the housing is about to fall down. It is possible to maintain the independence of the housing without reducing the falling angle.

With the above-described configuration, in the case 1 of this embodiment, when the inside of the case 1 is in a reduced pressure state due to cooling after the high-temperature filling process, the body 4 The cylindrical shape of the peripheral wall 4a is maintained without being locally inverted and deformed.
Then, a pressing force acts on the peripheral wall 4a in the vertical direction as shown by a white arrow in FIG. 3, and the peripheral groove 6 elastically moves as schematically shown by a two-dot chain line in FIG. , The height dimension of the body part 4 is shortened by being deformed in a compressed state in the vertical direction,
As schematically shown by a two-dot chain line in FIG. 4, the circumferential protrusion 13 a having a trapezoidal cross-sectional shape is deformed so as to extend, and a depressed deformation portion extending from the circumferential protrusion 13 a to the depressed recess 15. 16 is displaced upward (see the direction of the white arrow in FIG. 4),
The shortening of the height dimension of the body part 4 and the upward displacement of the depressed deformation part 16 combine to fully exhibit the reduced pressure absorption function.

Further, in the state where the depressed deformed portion 16 is displaced upward due to the reduced pressure, the annular flat portion 12a functions as a grounding portion instead of the circumferential protrusion 13a. Retained.
Here, by arranging the groove-shaped recess 17 in the inner circumference and the circumferential ridge 13 a peripheral edge boundary portion of the peripheral portion 12, depression of the depression deformation portion 16 in a reduced pressure state this groove-shaped recess 17 starting from It is possible to smoothly extend the upper displacement of the shape, and to suppress the distortion deformation in the peripheral edge portion 12 and to more stably exhibit the function of the peripheral edge portion 12 as a ground contact portion.

Next, FIGS. 5 to 7 show a housing of a second embodiment of the present invention, FIG. 5 is a front view, and FIG. 6 is a bottom view. The overall shape of the housing 1 is substantially the same as the housing shown in FIGS. 1 and 2, and the shape of the protrusion 13 (circular protrusion 13a) is a protrusion height H of 2 mm and a width W of 8 mm. It is.

7 (a) is a bottle of the second embodiment, also (b) is a partially enlarged longitudinal section of the peripheral edge portion 12 and the circumferential ridge 13 a vicinity of the bottle body of Comparative Example according to this embodiment .
Shape of the bottom part 5, the circumferential ridge 13 a through the peripheral portion 12 from the heel wall 11 with Ryobintai are continuously provided, also, the outer peripheral edge of the inner peripheral edge and the circumferential ridge 13 a of the peripheral portion 12 A groove-like recess 17 formed by stepping the bottom wall upward and inward is provided at the boundary portion.

In both cases, the width Wp of the peripheral edge portion 12 is 3 mm, but in the case of the comparative example, the peripheral edge portion 12 is horizontal and has an annular flat portion 12a.
As shown in FIG. 7A, the casing of the second embodiment is characterized in that the peripheral edge portion 12 has an inclined surface inclined obliquely upward toward the central axis direction of the casing.
When the degree of inclination of the inclined surface is expressed by the height difference h (see FIG. 7A) between the lower end 12b of the peripheral edge portion 12 and the inner peripheral edge, the height difference h is set to 0.5 mm.

Here, in the high temperature filling step, immediately after filling the high temperature content liquid and sealing with the cap, the synthetic resin forming the casing is softened and the inside of the casing is in a pressurized state. A so-called bottoming phenomenon occurs in which the bottom wall of the body is deformed in a bulging shape downward (in the direction of the white arrow in FIG. 7A).
The bottom drop behavior, as filling temperature of the liquid content increases, also increases the wall thickness of the bottle body as thinning becomes greater to some extent, when the bottle body becomes reduced pressure, from the circumferential ridge 13a The depression- like upward displacement of the depression deformation portion over the depression recess 15 is unevenly biased, and as a result, the reduced pressure absorption function is not sufficiently exhibited, and further, local deformation occurs at the peripheral portion, There is a risk that the independence of the skeleton will be impaired.

  The housing of the second embodiment is for dealing with the further increase in the filling temperature of the content liquid and the further thinning of the wall thickness of the housing as described above, and the peripheral portion 12 is shown in FIG. As described above, the bottoming phenomenon is effectively suppressed by making the inclined shape.

In addition, when the inclination of the peripheral edge portion 12 is excessively increased, the bottom drop can be sufficiently suppressed, but on the other hand, the depression-like upward displacement of the depression deformation portion from the circumferential protrusion 13a to the depression depression 15 is difficult to occur during decompression. Thus, the reduced pressure absorption function is not fully exhibited.
Therefore, the width Wp of the peripheral portion 12 is 2 to 4 mm in consideration of the function as the ground contact portion after the depression-like upward displacement of the depression deformation portion at the time of decompression (3 mm in the case of the second embodiment). And the height difference h is in the range of 0.2 to 0.8 mm (0.5 mm in the case of the second embodiment). Can be fully exhibited.

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.
First, the longitudinal cross-sectional shape including the groove width, groove depth, groove sidewall inclination, and the like, and the position and number of arrangements of the circumferential groove, in addition to the appearance design and the required vacuum absorption function, the circumferential groove It can be set as appropriate in consideration of the reinforcing effect related to the surface rigidity of the body portion due to the above and the degree of reduction in the buckling strength in the vertical direction due to the arrangement of the circumferential groove.

Further, as shown in FIG. 8 which shows three examples (a), (b), and (c) of the shape of the bottom, the shape of the bottom is not limited to the above embodiment, and various variations are adopted. Can do.
Although the flat cross-sectional shape of the depression 15 is an equilateral triangular anisotropy, the flat cross-sectional shape is circular as shown in FIG. 8A, and FIG. As shown, the step portion 15s may have a polygonal shape.

In addition, the shape of the ridge 13 such as the width and the height of the protrusion considers the size and thickness of the housing, the independence of the housing, etc., and calculates the deformation mode such as the ease of deformation of the bottom wall. It can be set as appropriate based on the test results.
Also, it ridges 13 are not limited to a continuous circumferential ridge 13a in the circumferential direction as in the first and second embodiments, as shown in FIG. 8 (c), a multi-speed (Fig. In the example of 8 (c), eight independent ridges 13 may be arranged around the notch 13K.

Further, the groove-shaped concave portion 17 can be disposed as necessary, and the shape such as the width and the groove depth can be appropriately determined.
Further, whether the peripheral edge portion 12 is horizontally flat, inclined, or the degree of inclination can be appropriately determined in consideration of the filling temperature of the content liquid, the degree of thinning, and the like. Is.

The synthetic resin casing of the present invention combines the depression deformation of the bottom wall of the bottom part with the compression deformation of the circumferential groove of the trunk part to sufficiently exhibit a sufficient decompression absorption function, and is self-supporting even during decompression. sex is sufficiently exhibited, also have a smooth peripheral wall because there is no vacuum panels in the body portion, even when the exterior of the shrink label is one that can exhibit an appearance that is clean with no wrinkles or the like, the content liquid it is possible to expect a wide range of applications development in the bottle fraction field that requires a high temperature filling.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6; Circumferential groove 6a; Groove upper end 6b; Groove side wall 6c; Groove bottom 11: Heel wall part 12: Peripheral part 12a; 13; ridge 13K; notch 13a; peripheral ridge 13t; flat tip portion 13s; side 15; depression 15s; step 16; depression deformed portion 17; groove-like depression 101; Body portion 107; peripheral groove rib 112; peripheral edge portion 115; recessed recess A; inclination angle D; groove depth Wc t ; groove width Wc b (at the groove upper end); groove width V (at the groove bottom); H: protrusion height W (of the ridge); width Wp (of the ridge); width (of the peripheral edge)

Claims (4)

In a high-temperature filling synthetic resin round casing that is biaxially stretch blow molded and has a cylindrical barrel (4), a plurality of circumferential grooves (6) are arranged on the peripheral wall (4a) of the barrel (4). Established,
On the bottom surface of the bottom part (5), on the inner side of the peripheral part (12), a ridge (13) that functions as a grounding part is formed by protruding the bottom wall downward from the peripheral part (12). In the central part, a concave recess formed by recessing the bottom wall upward and inward via a stepped portion (15s) formed in a reduced diameter with the inner side of the ridge (13) as a base end (15) is disposed, and with an increase in the degree of decompression inside the housing, the height of the body (4) is shortened due to compression deformation of the circumferential groove (6), and the protrusions ( 13) Due to the deforming deformation of extension 13), the depression-displacement part (16) from the protrusion (13) to the depression recess (15) exerts a reduced pressure absorption function, and the protrusion (13) configuration der the periphery instead of (12) to function as a ground portion is,
The depressed deformation portion (16) is composed of the protrusion (13), the stepped portion (15s) formed in the reduced diameter, and the depressed recess (15),
The circumferential groove (6) can be elastically compressed and deformed in the longitudinal direction by the action of the longitudinal pressing force accompanying the increase in the degree of decompression inside the housing. The circumferential wall (4a) has a trapezoidal shape as viewed in the longitudinal section. The groove depth (D) is 2 mm or more,
A synthetic resin round casing having an inclination angle (A) from the horizontal direction of the groove side wall (6b) of the circumferential groove (6) of 45 ° or less . Periphery (12), inclined plane-shaped synthetic resin round bottle of serial placement in claim 1, which is inclined obliquely upward toward the central axis of the bottle. The synthetic resin round casing according to claim 1 or 2, wherein the depressed recess (15) has a flat cross-sectional shape that changes from a circle near the center to a regular triangle at the base end. A groove-shaped recess (17) is formed at the boundary between the inner peripheral edge of the peripheral edge (12) and the outer peripheral edge of the ridge (13). The synthetic resin round casing according to any one of claims 1 to 3 .