JP2007269389A - Synthetic resin bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a part of the barrel wall of a PET bottle placed near the end of the bottle central axis direction of a pressure reduction absorbing panel to be prevented from being deformed due to the deformation of the panel and further restrict its trouble at its transmitting stage, or prevent the occurrence of poor outer appearance and the like. <P>SOLUTION: This cylindrical synthetic resin bottle 10 has a bottom in which a recessed-shaped pressure reduction absorbing panel 20 is formed at a barrel 11. A reinforced recessed part 22 having bottom walls 29, 30 substantially recessed deeper than the bottom wall 18 of the pressure reduction absorbing panel 20 is cooperatively arranged over an entire region in the peripheral direction of the bottle at its end in the bottle central axis line O direction of the bottom wall 18 of the pressure reduction absorbing panel 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bottomed cylindrical synthetic resin bottle in which a concave decompression absorption panel is formed in a body portion.

2. Description of the Related Art Conventionally, as shown in Patent Documents 1 and 2 below, for example, a concave decompression absorption panel is formed on a body portion of this type of synthetic resin bottle. By sealing the bottle filled with the high-temperature content liquid with the cap with this reduced pressure absorption panel, when the content liquid is cooled and the bottle internal pressure decreases, the body part is recessed substantially uniformly over the entire area. It is possible to suppress the occurrence of local dents.
Japanese Utility Model Publication No. 3-15318 Japanese Utility Model Publication No. 3-15319

However, in the conventional synthetic resin bottle, when the internal pressure changes or an external force acting inward acts on the body, the connection between the end of the vacuum absorbing panel in the bottle central axis direction and the body wall A relatively large deformation occurred in the portion and the vicinity of the body wall, and there was a possibility of causing troubles in the conveying process and poor appearance.
The change in the internal pressure of the bottle is caused by various processes such as filling, sealing, sterilization, and cooling of the content liquid, or a change in the external environment. Further, the inward external force acting on the body portion is generated by, for example, a customer gripping the bottle or line pressure (pressing between the bottles) in the bottle conveyance process.

  The present invention has been made in view of such circumstances, and due to the deformation of the vacuum absorbing panel, the portion of the body wall located near the end in the bottle central axis direction of the panel is deformed. An object of the present invention is to provide a synthetic resin bottle that can prevent the occurrence of troubles and poor appearance in the transport process.

In order to solve the above problems and achieve such an object, the synthetic resin bottle of the present invention is a bottomed cylindrical synthetic resin bottle in which a concave decompression absorption panel is formed on the body portion. In addition, a reinforcing recess having a bottom wall that is larger than the bottom wall of the vacuum absorption panel is connected to the end of the bottom wall of the vacuum absorption panel in the bottle central axis direction over the entire area in the circumferential direction of the bottle. It is characterized by that.
In this invention, since the reinforcing recess is continuously provided at the end of the bottom wall of the vacuum absorption panel in the bottle central axis direction, the bulging deformation due to the increase in the bottle internal pressure and the depression deformation due to the decrease in the bottle internal pressure are reduced. Even if it occurs in the absorption panel, it is possible to prevent the deformation state of the reduced pressure absorption panel from propagating outward in the bottle central axis direction from this panel due to the presence of the reinforcing recess.
In addition, when the inside of the synthetic resin bottle is in a reduced pressure state, a fold deformation (permanent deformation) that is difficult to restore, particularly at the connecting portion between the end of the reduced pressure absorption panel in the central axis direction of the bottle and the body wall occurs due to a small external force. Although it becomes easy, the occurrence of this deformation can be prevented.
As described above, due to the deformation of the vacuum absorbing panel, it is possible to prevent the portion of the body wall located near the end of the panel in the central axis direction of the panel from being deformed. Occurrence of troubles and poor appearance can be suppressed.

Here, it is preferable that the width of the reinforcing recess in the bottle circumferential direction is greater than or equal to the width of the reduced pressure absorption panel in the bottle circumferential direction.
In this case, it is possible to reliably suppress the deformation state of the reduced pressure absorption panel from propagating outward in the bottle center axis direction from this panel.

Moreover, it is preferable that the width | variety in the bottle center axis direction of the said reinforcement recessed part is made smaller than the width | variety in the bottle peripheral direction of this reinforcement recessed part.
In this case, the resistance against the deformation of the reinforcing recess is further increased.

Furthermore, reinforcing ribs may be formed on the vacuum absorbing panel.
In this case, the drag force against the deformation of the reduced pressure absorption panel itself is increased.

  According to the synthetic resin bottle according to the present invention, due to the deformation of the vacuum absorbing panel, the portion of the body wall located near the end of the panel in the central axis direction of the panel is prevented from being deformed. Therefore, it is possible to suppress troubles in the conveying process, appearance defects, and the like.

  Embodiments of the present invention will be described below with reference to the drawings. The synthetic resin bottle 10 according to the present embodiment includes a body portion 11 in which a concave decompression absorption panel 20 is formed, a bottom portion 12 provided at the lower end of the body portion 11 in the bottle central axis O direction, The shoulder portion 13 provided at the upper end portion and the mouth portion 14 provided at the upper end of the shoulder portion 13 are a bottomed cylindrical body integrally formed of a synthetic resin such as polyethylene terephthalate or polypropylene. ing. The synthetic resin bottle 10 can be formed, for example, by biaxial stretch blow molding.

In the portion extending from the bottom portion 12 to the shoulder portion 13, the panel surface portion 15 and the corner surface portion 16 narrower than the panel surface portion 15 form a ridge line 17 and are continuously arranged around the bottle center axis O. .
In the present embodiment, four panel surface portions 15 and four corner surface portions 16 are provided. The panel surface portion 15 includes a first panel surface portion 15a and two second panel surface portions 15b each having a narrower width than the first panel surface portion 15a. It is prepared one by one. The two first panel surface portions 15a and 15a are disposed to face each other with the bottle center axis O interposed therebetween, and the two second panel surface portions 15b and 15b are also disposed to face each other with the bottle center axis O interposed therebetween. Has been. That is, the bottle 10 has a flat polygonal shape as shown in FIG.

  Note that all four corner surface portions 16 have the same width that is narrower than the second panel surface portion 15b. Further, the first and second panel surface portions 15a and 15b of the body portion 11 are respectively provided with concave ribs 21 at the upper and lower portions in the bottle central axis O direction, and are recessed in the panel surface portions 15a and 15b. The reduced pressure absorption panels 20 are formed between the ribs 21. Of these reduced-pressure absorption panels 20, the second reduced-pressure absorption panel (not shown) formed on the second panel surface portion 15b has lateral ribs extending in the bottle circumferential direction with a predetermined interval in the bottle central axis O direction. A plurality are formed.

  In the present embodiment, the end of the bottom wall 18 of the first reduced pressure absorption panel 20a formed on the first panel surface portion 15a in the bottle central axis O direction is first covered over the entire region in the bottle circumferential direction at this end. A reinforcing recess 22 including bottom walls 29 and 30 that are recessed larger than the bottom wall 18 of the reduced pressure absorption panel 20a is continuously provided. In the example shown in the drawing, the reinforcing recess 22 includes an upper reinforcing recess 22a that is connected to the upper end of the bottom wall 18 of the first reduced pressure absorption panel 20a in the bottle center axis O direction, and the bottom wall 18 of the first reduced pressure absorption panel 20a. And a lower reinforcing concave portion 22b provided continuously to the lower end portion in the bottle center axis O direction.

  Further, the first reduced pressure absorption panel 20a has a vertically long rectangular shape in plan view in the bottle center axis O direction in which the width in the bottle center axis O direction is larger than the width in the bottle circumferential direction. Is a rectangular shape in plan view that is horizontally long in the peripheral direction of the bottle, the width of which is larger than the width in the bottle central axis O direction. The width of the reinforcing recess 22 in the bottle central axis O direction is smaller than the width of the first reduced pressure absorption panel 20a in the bottle circumferential direction.

Furthermore, the width | variety in the bottle circumferential direction of the reinforcement recessed part 22 is made more than the width in the bottle circumferential direction of the 1st decompression absorption panel 20a.
In addition, it is preferable to make the width | variety in the bottle circumferential direction of the reinforcement recessed part 22 larger than the width | variety in the bottle circumferential direction of the 1st decompression absorption panel 20a. For example, as shown in FIG. 1, the width of the reinforcing recess 22 in the bottle circumferential direction is the same as the width in the bottle circumferential direction of the bottom walls 29 and 30 in the bottle circumferential direction of the bottom wall 18 of the first reduced pressure absorption panel 20a. By setting it to be equal to or larger than the width, the width of the first reduced pressure absorption panel 20a in the bottle circumferential direction can be made larger.
Furthermore, a lateral rib (reinforcing rib) 23 extending in the bottle circumferential direction is formed in the first reduced pressure absorption panel 20a. In the illustrated example, a plurality of the lateral ribs 23 are formed on the bottom wall 18 of the first reduced pressure absorption panel 20a excluding both ends in the bottle central axis O direction at a predetermined interval in the central axis O direction. The both ends of the bottom wall 18 of the first reduced pressure absorption panel 20a in the bottle center axis O direction are flat surfaces.

Further, in the bottom wall 29 of the upper reinforcing recess 22a, the upper end in the bottle central axis O direction and both ends in the circumferential direction of the bottle are from the flat portion L that surrounds the upper reinforcing recess 22a from the upper side to the side in the body portion 11. It is connected with the 1st inclination wall 24 from which the amount of dents becomes large gradually toward these each edge.
Further, the bottom portion 30 of the lower reinforcing recess 22b has a lower end in the bottle center axis O direction and both ends in the circumferential direction of the bottle, the flat portion L of the body portion 11 surrounding the lower reinforcing recess 22b from the lower side to the side. From, it continues to the 2nd inclined wall 25 where the amount of dents becomes large gradually toward these each end.

  Here, the upper side reinforcement recessed part 22a and the lower side reinforcement recessed part 22b are connected with the said both ends of the bottom wall 18 of the 1st decompression absorption panel 20a, respectively. That is, the lower end in the bottle central axis O direction of the bottom wall 29 of the upper reinforcing recess 22a is directed upward from the upper end in the bottle central axis O direction of the bottom wall 18 of the first reduced pressure absorption panel 20a toward the upper direction of the central axis O. The bottom wall 30 of the lower reinforcing recess 22b is connected to the fourth inclined wall 27 having a gradually increased dent amount, and the upper end in the bottle center axis O direction is the bottle of the bottom wall 18 of the first reduced pressure absorption panel 20a. From the lower end in the direction of the central axis O, it is connected to the fifth inclined wall 28 whose dent amount gradually increases as it goes downward in the direction of the central axis O.

  In other words, the upper reinforcing recess 22a has the bottom wall 29, the first inclined wall 24 connecting the bottom wall 29 and the flat portion L, and the upper end of the bottom wall 29 and the bottom wall 18 of the first reduced pressure absorption panel 20a. It is comprised from the 4th inclination wall 27 to connect. The lower reinforcing recess 22b includes the bottom wall 30, the second inclined wall 25 connecting the bottom wall 30 and the flat portion L, and the bottom end of the bottom wall 30 and the bottom wall 18 of the first reduced pressure absorption panel 20a. And a fifth inclined wall 28 connecting the two.

Furthermore, the both ends of the bottle circumferential direction in the bottom wall 18 of the 1st reduced pressure absorption panel 20a go to these each ends from the flat part L located in the side of this 1st reduced pressure absorption panel 20a among the trunk | drum 11. Accordingly, the third inclining wall 26 is continuously provided so that the dent amount gradually increases.
That is, the first reduced pressure absorption panel 20a includes the bottom wall 18 and the third inclined wall 26 that connects the bottom wall 18 and the flat portion L.

As described above, according to the synthetic resin bottle 10 according to the present embodiment, the reinforcing recess 22 is continuously provided at the end of the bottom wall 18 of the first reduced pressure absorption panel 20a in the bottle central axis O direction. Even if a bulging deformation due to an increase in the bottle internal pressure and a depression deformation due to a decrease in the bottle internal pressure occur in the first reduced pressure absorption panel 20a, the deformation state of the first reduced pressure absorption panel 20a is caused by the presence of the reinforcing recess 22 in this panel. Propagation outward in the bottle central axis O direction than 20a can be prevented. Further, when the inside of the synthetic resin bottle 10 is in a reduced pressure state, it is difficult to restore to the connecting portion between the end portion in the bottle central axis O direction of the first reduced pressure absorption panel 20a and the body wall by a small external force ( Permanent deformation) is likely to occur, but this deformation can also be prevented.
As described above, due to the deformation of the first reduced pressure absorption panel 20a, it is possible to prevent the portion of the body wall located near the end of the panel 20a in the bottle central axis O direction from being deformed. The occurrence of troubles and appearance defects in the conveying process can be suppressed.

  Moreover, in this embodiment, since the width | variety in the bottle circumferential direction of the reinforcement recessed part 22 is made more than the width | variety in the bottle circumferential direction of the 1st decompression absorption panel 20a, the deformation | transformation state of the 1st decompression absorption panel 20a is this panel. Propagation outward in the bottle central axis O direction than 20a can be reliably suppressed.

  Furthermore, since the width of the reinforcing recess 22 in the bottle central axis O direction is smaller than the width of the reinforcing recess 22 in the bottle circumferential direction, it is possible to further increase the resistance of the reinforcing recess 22 to the deformation.

  Furthermore, since the transverse ribs 23 are formed on the first reduced pressure absorption panel 20a, the resistance against the deformation of the first reduced pressure absorption panel 20a itself is increased. For example, the filling pressure at the time of filling the content liquid is increased. The resulting bulging deformation of the first reduced-pressure absorbing panel 20a can be more reliably suppressed.

  In particular, in the present embodiment, among the plurality of reduced pressure absorption panels 20, respectively, the both end portions of the first reduced pressure absorption panel 20a formed on the first panel surface portion 15a that is wider than the second panel surface portion 15b and easily deforms, Since the reinforcing concave portion 22 is formed, it is possible to prevent the first panel surface portion 15a of the trunk portion 11 from being subjected to the internal pressure change of the bottle 10 and the local depression due to the external force. The shape stability of the part 11 can be improved efficiently.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
In the above embodiment, the synthetic resin bottle has a flat polygonal shape when viewed from the top, but instead, a synthetic resin bottle having a circular shape or a regular polygon shape may be used.

Moreover, in the said embodiment, although the convex horizontal rib 23 extended in the bottle circumferential direction was formed in the 1st pressure reduction absorption panel 20a, it replaces with this, for example, a concave horizontal rib or a bottle center axis line O direction. An extending convex or concave vertical rib or the like may be formed. Alternatively, reinforcing ribs such as the lateral ribs 23 may not be formed on the first reduced pressure absorption panel 20a.
Further, the reinforcing recess 22 may be formed on both the first and second panel surface portions 15a and 15b of the trunk portion 11, or may be formed only on the second panel surface portion 15b of the trunk portion 11. Moreover, although the reinforcement recessed part 22 was formed in the both ends of the bottle center axis line O direction of the decompression absorption panel 20, you may form in an upper end part or a lower end part.

  Furthermore, in the said embodiment, although the width | variety in the bottle circumferential direction of the bottom walls 29 and 30 of the reinforcement recessed part 22 was made more than the width in the bottle circumferential direction of the bottom wall 18 of the 1st decompression absorption panel 20a, it replaced with this. For example, after making the width of the bottom walls 29 and 30 of the reinforcing recess 22 smaller than the width of the bottom wall 18 of the first reduced pressure absorption panel 20a, the first, second and third inclined walls 24 and 25 are used. , 26 in the bottle circumferential direction may be set appropriately so that the width of the reinforcing recess 22 in the bottle circumferential direction is equal to or greater than the width of the first reduced pressure absorption panel 20a in the bottle circumferential direction.

Moreover, in the said embodiment, although the decompression absorption panel 20 was formed one by one in all the panel surface parts 15 in the trunk | drum 11, the number of the decompression absorption panels 20 formed in each panel surface 15 is restricted to the said embodiment. is not. Further, among the plurality of panel surface portions 15 in the body portion 11, the panel surface portion 15 that forms the reduced pressure absorption panel 20 may be appropriately changed according to, for example, the content liquid filled in the synthetic resin bottle 10.
Furthermore, the planar view shapes of the reduced pressure absorption panel 20 and the reinforcing recess 22 are not limited to the above embodiment, and may be, for example, a circular shape or a polygonal shape.

  Due to the deformation of the vacuum absorbing panel, it becomes possible to prevent the portion of the body wall located near the end of the panel in the central axis direction of the bottle from being deformed. The occurrence of defects and the like can be suppressed.

It is a front view of the synthetic resin bottle shown as one embodiment concerning the present invention. It is a top view of the synthetic resin bottle shown in FIG. It is an AA arrow directional cross-sectional view of the synthetic resin bottles shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Synthetic resin bottle 11 Body 18 Bottom wall of 1st decompression absorption panel 20 Decompression absorption panel 20a 1st decompression absorption panel 22 Reinforcement recessed part 23 Lateral rib (reinforcement rib)
29, 30 Bottom wall of reinforcing recess O Bottle central axis

Claims (4)

It is a bottomed cylindrical synthetic resin bottle in which a concave decompression absorption panel is formed on the body,
At the end of the bottom wall of the vacuum absorption panel in the bottle central axis direction, a reinforcing recess having a bottom wall that is larger than the bottom wall of the vacuum absorption panel is provided continuously over the entire area in the bottle circumferential direction at this end. A synthetic resin bottle characterized by In the synthetic resin bottle according to claim 1,
A synthetic resin bottle characterized in that the width of the reinforcing recess in the bottle circumferential direction is equal to or greater than the width of the reduced pressure absorption panel in the bottle circumferential direction. In the synthetic resin bottle according to claim 1 or 2,
A synthetic resin bottle characterized in that the width of the reinforcing recess in the bottle central axis direction is smaller than the width of the reinforcing recess in the bottle circumferential direction. In the synthetic resin bottle according to any one of claims 1 to 3,
A synthetic resin bottle, wherein a reinforcing rib is formed on the vacuum absorbing panel.

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