JP2010052762A - Square bottle body made of synthetic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a peripheral wall shape of body part of a synthetic resin square bottle which is relatively small and formed with pressure-reduction-and-absorption panels and exerts sufficiently a pressure-reduction-and-absorption function while securing a rigidity and buckling strength of the bottle body even if the bottle is thinned. <P>SOLUTION: The synthetic resin square bottle having a body part of a square cylinder which is provided with a spout cylinder part via a shoulder part of a taper cylinder so as to stand therefrom. The pressure-reduction-and-absorption panels are formed in four planar walls constituting the wall part of the body part so as to be recessed over substantially the entire height range of the body part. The pressure-reduction-and-absorption panel is shaped so as to have a width reducing area where a lateral width reduces from a predetermined vertical height position to a center height position. A groove-shaped lateral rib is formed in the peripheral wall part positioned between the adjacent pressure-reduction-and-absorption panels in a height position opposite substantially a center part of the width reducing area so that the rib couples the adjacent pressure-reduction-and-absorption panels to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a synthetic resin prismatic casing having a quadrangular cylindrical body.

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. For example, Patent Document 1 describes an example of a square-shaped rectangular housing in which a flat cross-sectional shape of a body portion is rounded.
The casing 101 shown in FIG. 10 is a so-called PET bottle made of PET resin and biaxially stretched and blow-molded, and is a rectangular casing having a capacity of 500 ml. A barrel portion 104 having a mouth tube portion 102 standing upright via a shoulder 103 having a tapered square tube shape at the upper end and a bottom portion 108 connected to the lower end has a square-shaped square tube structure with a rounded corner. The peripheral wall 104 is formed by a corner wall 106 which is a portion obtained by chamfering the flat wall 105.
The corner wall 106 functions as a pillar portion that supports the structure of the frame.
Further, a circumferential groove rib 113 is formed at the center height position of the body portion 104 in order to increase the surface rigidity and buckling strength of the peripheral wall of the body portion 104.

The casing 101 is a so-called heat-resistant square bottle, and a decompression absorption panel 112 is formed in a depressed shape so as to be surrounded by a step portion 111 in the upper and lower regions of the circumferential groove rib 113 of each flat wall 105. Yes.
In heat-resistant bottle applications where the content liquid is filled at a high temperature of about 80 to 90 ° C. for the purpose of sterilization, the internal pressure is reduced as the temperature of the content liquid after filling is reduced. The function of preventing the local depression-like deformation of the peripheral wall of the body portion and making the appearance inconspicuous, that is, a so-called decompression absorption function is exhibited.

On the other hand, the housing 1 shown in FIG. 6 (a) is a relatively small square PET bottle having a capacity of 350 ml. However, in such a relatively small housing, the area for forming the vacuum absorbing panel 12 is limited. Therefore, in order to sufficiently exhibit the reduced-pressure absorption function, the vertically elongated rectangular-shaped reduced-pressure absorption panel 12 is often formed over substantially the entire height range of the trunk portion 4 as in the case 1.
JP 2001-180637 A

  In the field of PET bottles produced in large quantities, weight reduction, that is, wall thickness reduction, is demanded from the viewpoint of resource saving and material cost reduction. In addition, since the vacuum absorbing panel becomes a starting point of buckling deformation not only at the time of decompression but also when an external force is applied, the wall thickness is usually thin in a case having a relatively large capacity of 500 ml or more. In order to compensate for the reduction in surface rigidity and buckling strength of the peripheral wall of the body part due to the formation of a vacuum absorption panel, a circumferential groove rib is formed at the center height position of the body part as shown in FIG. Alternatively, reinforcing ribs are formed on the vacuum absorbing panel itself.

However, in the comparatively small prismatic housing as shown in FIG. 6A, the area for forming the reduced pressure absorption panel 12 is limited as described above. It is necessary to form the reduced-pressure absorption panel 12 having a shape in the substantially entire height range of the body portion 4 and to greatly deform the reduced-pressure absorption panel 12 to exhibit a necessary reduced-pressure absorption function. Is to reduce the area of the vacuum absorbing panel 12 and the deformability, and there is a limit to complement the reduction in surface rigidity and buckling strength of the peripheral wall of the trunk portion by a circumferential groove rib or the like. When an external pressing force is applied to the ridge line 7 or when the pressure is reduced, for example, the ridge line 7 is buckled and deformed at the position and direction indicated by the two-dot chain line in FIG. There is a problem of bending and permanent deformation into a shape.
Such a problem becomes more serious by reducing the wall thickness, and not only the appearance is impaired by permanent deformation, but also causes troubles in the content liquid filling line, the vending machine, and the like.

  Therefore, the present invention sufficiently exhibits the vacuum absorption function while ensuring the rigidity and buckling strength of the casing even if it is thin, in a relatively small synthetic resin prismatic casing formed with a vacuum absorbing panel. It is a technical problem to create a shape of the peripheral wall of the trunk that can be used.

Among the means of the present invention for solving the above technical problem, the main configuration is:
In the square housing made of synthetic resin, which has a square tubular body, and the mouth tubular portion is erected on the body through a tapered tubular shoulder,
A vacuum absorbing panel is formed in a depression over the entire height range of the body part on the four flat walls constituting the peripheral wall of the body part,
The shape of this reduced pressure absorption panel is a shape having a reduced width region where the lateral width is reduced from the upper and lower predetermined height positions to the center height position,
A groove-shaped lateral rib is formed so as to connect the adjacent reduced pressure absorption panels at a height position facing the substantially central portion of the reduced width region of the peripheral wall portion located between the adjacent reduced pressure absorption panels.
It is said.

  In the above configuration, since the groove-shaped horizontal rib is formed in the portion between the adjacent vacuum absorption panels, the vacuum absorption panel is not divided vertically by the horizontal ribs. It can be depressed and deformed, and can fully exhibit the reduced pressure absorption function.

  Next, the vertical ribs located at the left and right ends of the flat wall are buckled and deformed by the lateral ribs formed between the adjacent vacuum absorbing panels. It is possible to effectively suppress the phenomenon of deformation.

  Here, in a case having a decompression panel having a generally vertically long rectangular shape as in the conventional case, if a lateral rib is formed between adjacent decompression absorption panels, the effect of buckling deformation of the ridgeline as described above is effective. On the other hand, if the pressing force acts on an arbitrary flat wall, the flat wall adjacent to the flat wall on which the pressing force acts is deformed near the region where one end of the lateral rib is located. Concentration occurs, and the peripheral wall sharply protrudes and deforms at that portion, resulting in a problem that permanent deformation remains. Such a problem becomes particularly serious when the wall thickness is reduced.

Therefore, as described in the main configuration of the present invention described above,
The shape of the reduced pressure absorption panel is a shape having a reduced width region whose width is reduced from a predetermined height position to the center height position, and a lateral rib is formed so as to connect adjacent reduced pressure absorption panels. Therefore, the concentration of the deformation of the peripheral wall in the vicinity of the end portion of the lateral rib, which is caused by the combined effects of the two and forming the lateral rib in the portion between the adjacent vacuum absorption panels, can be reduced.
In other words, the deformation of the peripheral wall due to the pressing force or during decompression is distributed upward and downward from the vicinity of the end of the lateral ribs as a gentle convex deformation, effectively suppressing permanent deformation or automatic sales by sharp protruding deformation Problems related to troubles in the aircraft can be solved.

  In another configuration of the present invention, in addition to the main configuration described above, the steps of the flat wall portions on the left and right outer sides of the reduced width region are recessed toward the left and right central directions of the flat wall. It extends in the longitudinal direction along the edge.

  In the above-described configuration, the flat wall portions on the left and right outer sides of the reduced width region are provided with steps that are recessed toward the left and right central direction of the flat wall in the vertical direction along the left and right ends of the upper and lower ends of the vacuum absorbing panel. By adopting such a configuration, it is possible to increase the degree of depression deformation of the vacuum absorption panel even in the reduced width region by utilizing the ease of deformation at the left and right step portions, and the reduced pressure absorption is achieved by the reduced width region. It is possible to compensate for the decrease in the vacuum absorption function caused by the reduction in the panel area.

Since the present invention has the above-described configuration, the following effects can be obtained.
That is, in the case of the main configuration of the present invention, the lateral ribs increase the surface rigidity and buckling strength of the peripheral wall in the portion between the vacuum absorption panels, and are generated particularly in the vertical ridge lines located at the left and right ends of the flat wall. It is possible to effectively suppress buckling deformation that dents into a "<" shape, and to form the reduced pressure absorption panel with a reduced width region and connect the reduced pressure absorption panel adjacent to the lateral rib. By adopting the configuration, the sharp projecting deformation of the peripheral wall due to the formation of the lateral rib can be distributed in the vertical direction from the vicinity of the end of the lateral rib to make a gentle convex deformation, and the permanent deformation is effectively performed It is possible to suppress problems associated with troubles in vending machines due to sharp protrusion deformation.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 show an embodiment of a housing according to the present invention. FIG. 1 is an overall front view, and FIG. 2 is a plan sectional view taken along the line AA in FIG. is there.

  This casing 1 is a thin biaxial stretch blow molded product made of PET resin (average thickness of the barrel 4 is 0.31 mm), is a relatively small square casing having an overall height of 150 mm and a capacity of 350 ml. A substantially square cylindrical frustum-shaped shoulder 3 is connected to the upper end of a substantially square cylindrical body 4 with a rounded corner, and a screw thread and a neck ring are provided on the outer peripheral surface of the upper end of the shoulder 3. The cylindrical mouth tube portion 2 is erected.

The body part 4 with the corners rounded is formed by a corner wall 6 connecting the four flat walls 5 and the adjacent flat wall. Each flat wall 5 is formed with a reduced pressure absorption panel 12 so as to be surrounded by a step portion 11 over substantially the entire height range of the body portion 4.
The shape of the reduced pressure absorption panel 12 is a vertically long rectangular shape as a whole, but from a predetermined vertical position (in the present embodiment, approximately 1/3 from the top and approximately 1/3 from the bottom). It has a shape having a reduced width region 13 whose width is reduced toward the center height position.

  Further, in the peripheral wall portion between the adjacent reduced pressure absorption panels 12, groove-shaped lateral ribs 15 are formed at the height position opposite to the central height position of the reduced width region 13 so as to connect the adjacent reduced pressure absorption panels 12. Forming.

  Further, a step 16 that is recessed toward the left and right central direction of the flat wall 5 is formed along the left and right ends of the upper and lower ends of the vacuum absorbing panel 12 in the vertical direction. It is formed so as to extend.

FIG. 4 is a partial cross-sectional view taken along the line A1-A1 in FIG. 1, showing the uneven state of the flat wall 5 portion of the body 4 in the reduced width region 13, and the state Bd indicated by the solid line is Before deformation, a state Ad indicated by a two-dot chain line indicates a depressed deformation state during decompression.
As can be seen from this figure, in the height range of the reduced width region 13, the decompression absorbing panel 12 is recessed from the left and right end portions of the flat wall 5 through the recesses at two locations of the step 16 and the step portion 11. However, the amount of depression deformation of the reduced pressure absorption panel 12 can be increased in the reduced width region 13 by utilizing the ease of deformation of the left and right step portions 16 at the time of decompression. The decrease in the reduced pressure absorption function due to the reduced area of the reduced pressure absorption panel 12 can be compensated.

  Here, FIG. 5 shows, for comparison, the deformation mode of the flat wall 5 during decompression when the step 16 is not formed, and the state Bd and the deformation of the depression shown by the solid line before the deformation are shown. Comparing the state Ad indicated by the two-dot chain line later, it can be seen that the amount of depression deformation during decompression is considerably limited compared to the case of FIG.

Next, FIG. 6A is an overall front view of the housing of the first comparative example, and FIG. 6B is a plan sectional view taken along the line CC in FIG.
The overall shape of the housing 1 is the same as that of the embodiment shown in FIG. 1, but the shape of the vacuum absorbing panel 12 is a vertically long rectangle, that is, there is no reduced width region 13 in FIG. Moreover, it is different in that the lateral ribs 15 are not formed.

8A is an overall front view of the housing of the second comparative example, and FIG. 8B is a cross-sectional plan view taken along line EE in FIG.
The overall shape of the housing 1 is the same as that of the embodiment shown in FIG. 1 except that the shape of the vacuum absorbing panel 12 is a vertically long rectangular shape. On the other hand, as compared with the casing of the first comparative example shown in FIG. 6, the difference is that the lateral ribs 15 are formed in the region between the adjacent vacuum absorbing panels 12.

Next, for the case of the embodiment shown in FIGS. 1 and 2, the case of the first comparative example shown in FIG. 6, and the case of the second comparative example shown in FIG. Deformation modes when a pressing force is applied to the position are shown in FIGS. 3, 7, and 9, respectively.
3 (a), 7 (a), and 9 (a) are front views, and FIGS. 3 (b), 7 (b), and 9 (b) are respectively in FIG. 3 (a). It is the plane sectional view which followed the BB line, the DD line in Fig.7 (a), and the FF line in Fig.9 (a). Also, the alternate long and short dash lines in FIGS. 3B, 7B, and 9B show the state before deformation.
Also, the positions where the pressing force is applied are all hatched areas in FIG. 3A, and are the positions near the ridgeline 7 at the central height position of the flat wall 5, and the direction of the action is shown in FIG. It is the direction shown by the white arrow in b).
In addition, it is assumed that the action of the pressing force at the position as described above actually occurs in the vending machine or at the time of decompression.

  As shown in FIG. 7, in the case 1 of the first comparative example, the ridge line 7 is buckled and deformed so as to be recessed in the shape of “U” in the immediate vicinity where the pressing force is applied. It will be deformed. (See alternate long and two short dashes line in FIG. 7A, FIG. 7B)

  In the case 1 of the second comparative example, as shown in FIG. 9, due to the effect of the lateral ribs 15, there is no buckling deformation at the ridge line 7 as seen in the case of the first comparative example. On the other hand, due to the action of the lateral ribs 15, the flat wall 5 on which the pressing force acts on the flat region 5b adjacent to the end 15e of the lateral rib 15 of the flat wall 5n adjacent to the corner wall 6 is limited. The deformation due to the pressing force is concentrated, and the peripheral wall is sharply projecting and deformed at the portion, and the permanent deformation remains.

Here, FIG. 3 shows a modification of the casing 1 of the embodiment shown in FIG. 1 as described above, but it can be seen in the casing 1 of the first comparative example due to the effect of the lateral rib 15. Such buckling deformation of the ridgeline 7 can be effectively suppressed.
Further, by forming the reduced pressure absorption panel 12 in a shape having the reduced width region 13 and forming the lateral rib 15 so as to connect the adjacent reduced pressure absorption panels 12, as in the case 1 of the second comparative example. The concentration of deformation in the vicinity of the end 15e of the lateral rib 15 can be relaxed, the deformation in the adjacent flat wall 5n can be widely dispersed in the region Da, and the occurrence of permanent deformation can be prevented. Problems related to troubles in vending machines or the like due to sharp convex protrusion deformation can be effectively solved.

As mentioned above, although embodiment of this invention was described along the Example, the effect of this invention is not limited to these Examples. For example, the height width and the degree of the width reduction of the reduced width region can be appropriately set in consideration of the capacity of the casing, the thickness, the reduced pressure absorption function, and the like.

  The synthetic resin prismatic casing of the present invention is a thin, relatively small bottle that fully exhibits the vacuum absorption function while ensuring the rigidity and buckling strength of the casing. Wide range of application development is expected.

It is a whole front view which shows one Example of the housing of this invention. It is the plane sectional view which looked at the cutting arrow along the AA line in FIG. (A) which shows an example of the deformation | transformation aspect of the housing of FIG. 1 is a whole front view, (b) is a plane sectional view along the BB line in (a). FIG. 2 is a partial plan sectional view taken along line A1-A1 in FIG. FIG. 5 is a partial plan cross-sectional view similar to FIG. 4 showing an example in which no step is formed in the housing of FIG. 1. (A) of the housing of a 1st comparative example is a whole front view, (b) is a plane sectional view in alignment with CC line in (a). (A) which shows an example of the deformation | transformation aspect of the housing of FIG. 6 is a whole front view, (b) is a plane sectional view along the DD line in (a). (A) of the housing of a 2nd comparative example is a whole front view, (b) is a plane sectional view along the EE line in (a). (A) which shows an example of the deformation | transformation aspect of the housing of FIG. 8 is a whole front view, (b) is a plane sectional view along the FF line in (a). It is a whole front view which shows the prior art example of a square frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; The trunk | drum 5; Flat wall 5n; (Adjacent) flat wall 6; Corner wall 7; Ridge line 8: Bottom part 11; Step part 12; Reduced width region 15; transverse rib 15e; end 16; step 101; housing 102; mouth tube 103; shoulder 104; trunk 105; flat wall 106; corner wall 108; Panel 113; circumferential groove ribs Bd, Ad; states Da, Db; (deformation) region

Claims (2)

A rectangular tubular body (4), and a body in which a tubular body (2) is erected on the body (4) via a tapered tubular shoulder (3). A vacuum absorbing panel (12) is formed in the flat wall (5) that constitutes the peripheral wall of (4) by depression over the entire height range of the body (4).
The shape of the vacuum absorption panel (12) is a shape having a reduced width region (13) whose lateral width is reduced from a predetermined height position up and down to a central height position, and is positioned between adjacent vacuum absorption panels (12). A groove-shaped lateral rib (15) is formed at a height position of the peripheral wall portion facing the central portion of the reduced width region (13) so as to connect the adjacent reduced pressure absorption panel (12). Synthetic resin square housing. On the flat wall (5) on the left and right outer sides of the reduced width region (13), steps (16) that are recessed toward the left and right central direction of the flat wall (5) are formed on the upper and lower ends of the vacuum absorption panel (12). The synthetic resin prismatic casing according to claim 1, wherein the rectangular casing is configured to extend in the vertical direction along the left and right ends.

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