JP2018162095A - Container made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container made of resin which can endure container deformation from inner pressure change after heat filling and volume change of content fluid even if the area of a pressure reduction and absorption part is small, and on which buckling deformation is hard to occur.SOLUTION: It includes an opening part 2 from which a cap can be freely removed, a shoulder part 3 connected to the opening part 2, a body part 4 connected to the shoulder part 3 and a bottom part 5 positioned in connection with the body part 4 and on the lowest part. A pressure reduction and absorption part 9 formed on the body part 4 by caving in has a bulge area 11 that on the cross section forms a convex shape outside the container, and the length in the height direction of the bulge area 11 is 20 mm to 40 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin container including a reduced pressure absorption part.

  As a conventional resin container, for example, as shown in Patent Document 1, a PET bottle having a reduced pressure absorbing portion on each of an upper side and a lower side of a trunk portion is known. The decompression absorption part is formed to be depressed one step from the side of the PET bottle, and prevents deformation of the PET bottle container by being curved and displaced in response to fluctuations in internal pressure after hot filling, volume fluctuations in the content liquid, etc. is there.

JP 2004-299758 A

  However, in the case of a conventional plastic bottle, for example, when taking a shape that places importance on design, the area where the reduced pressure absorbing portion is provided may be limited. Therefore, when the area of the reduced pressure absorbing portion is reduced, and particularly when the length in the height direction is reduced, there arises a problem that the reduced pressure absorbing performance is deteriorated. Further, in conventional PET bottles, when an impact or load is applied from above and below, the flat panel in the vacuum absorbing part is bent and displaced outward, thereby reducing the internal pressure of the container and causing buckling deformation. There are many cases.

  Therefore, an object of the present invention is to provide a resin container that can withstand deformation of the container due to volume fluctuation of the content liquid and the like, and is less likely to be buckled. is there.

  The resin container according to the present invention has a characteristic configuration in which a cap is detachably attached to a mouth, a shoulder connected to the mouth, a body connected to the shoulder, and a body connected to the body. And a bottom part located at the bottom, and a decompression absorbing part formed in a depression in the body part has a bulging area that protrudes outside the container in a cross section, and the length of the bulging area in the height direction is 20 mm. It is in a point of ~ 40 mm.

  A further characteristic configuration of the resin container according to the present invention is that the curvature radius of the cross-sectional shape of the bulging region is 40 mm to 160 mm.

  According to this configuration, since the bulging area of the vacuum absorbing part swells to the outside of the container, the vacuum absorption margin becomes larger than that of a conventional vacuum absorbing part having a flat panel, so that a higher vacuum absorbing performance is exhibited. Is done.

  Further, according to this configuration, since the bulging area of the reduced pressure absorbing portion bulges from the beginning to the outside of the container, even if an impact or load is applied from the vertical direction, the bulging area is unlikely to be curved and displaced to the outside of the container. For this reason, the internal pressure of the container is unlikely to decrease and buckling deformation hardly occurs.

  Therefore, according to this configuration, since it is possible to ensure higher decompression absorption performance and buckling deformation strength, the area of the decompression absorption portion is smaller, and in particular, the length in the height direction of the bulging region is 20 mm to 40 mm. That is, it is possible to make it shorter than the length in the height direction of the planar panel in the conventional reduced pressure absorption part.

  In particular, when the curvature radius of the cross-sectional shape of the bulging region is 40 mm to 160 mm, the reduced pressure absorption performance and the buckling deformation strength are further improved.

It is a side view of a resin container. It is a longitudinal cross-sectional view of the resin-made container in the arrow line II-II of FIG. It is a cross-sectional view of the resin container taken along line III-III in FIG. It is a side view of other embodiment of a resin container.

Embodiment
Hereinafter, as a preferred embodiment of a resin container according to the present invention, a plastic bottle 1 filled with a liquid such as a beverage will be described with reference to the drawings.

First, various terms used in this specification are defined as follows.
In the present specification, the “vertical direction” means the direction of the central axis XX of the plastic bottle 1 (hereinafter, abbreviated as the bottle 1) in FIG. Particularly, in FIGS. 1, 2 and 4, the upper side refers to the upper end side of the drawing, and the lower side refers to the lower end side of the drawing.
The “lateral direction” or “horizontal direction” means a direction orthogonal to the central axis XX direction.
The “circumferential direction” means a direction along the outline of the cross-sectional shape.
The “radial direction” means the radial direction of the circle when the central axis XX is considered as the center of the circle.
“Height” means a length along the direction of the central axis XX.
“Depth” means the length along the radial direction.
The “cross-sectional shape” means a cross-sectional shape of the bottle 1 in a plane (cross section) orthogonal to the central axis XX.
“Vertical cross-sectional shape” means a cross-sectional shape of the bottle 1 in a plane (vertical cross section) along the central axis XX.

  As shown in FIG. 1 and FIG. 2, the bottle 1 according to this embodiment includes, in order from the top, a mouth part 2 with a cap detachable, a shoulder part 3 connected to the mouth part 2, and a shoulder part 3. And a bottom part 5 which is connected to the body part 4 and located at the lowermost part. Moreover, the bottle 1 which concerns on this embodiment is a cylindrical container with a substantially circular cross section.

  The bottle 1 can be manufactured by a known molding method such as a biaxial stretch blow molding method using, for example, a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material.

  The liquid filled in the bottle 1 is not particularly limited. For example, beverages such as drinking water, tea, fruit juice, coffee, cocoa, soft drinks, alcoholic beverages, milk beverages, soups, sauces and soy sauce Such as liquid seasonings such as. Also, the content of the bottle 1 is not particularly limited. Depending on the type of liquid to be filled, the bottle 1 has a relatively small capacity of several hundred milliliters to a relatively large capacity of several liters. You may apply arbitrarily. In addition, when applying the bottle 1 as a bottle for drinks, it is desirable that the internal volume be 350 mL to 700 mL.

(Mouth)
The mouth part 2 is a part constituted by a cylinder whose upper end is open, and functions as a spout for beverages and the like. A male screw portion is formed on the outer peripheral surface of the mouth portion 2, and a cap (not shown) is detachably screwed and fixed.

(Shoulder)
The shoulder portion 3 is a portion configured to have a substantially conical shape with a diameter continuously increased from the upper end downward. A multi-sided wall is defined on the side surface of the shoulder 3 in the present embodiment.

(Torso)
The body 4 includes a label 6 on the upper side and a grip 7 on the lower side. In addition, the body 4 in the present embodiment is provided with three circumferential grooves 8 in order to reinforce the strength.

  A label for displaying a brand or the like of the beverage can be provided on the outer peripheral surface of the label portion 6. As the label, for example, a heat-shrinkable film material (shrink film) having printability, a roll label, or the like can be used. The heat-shrinkable film material on which the desired printing has been performed is formed into a cylindrical shape, placed on the bottle 1, and this is heated and contracted so as to be in close contact with the side surface of the bottle 1.

  In the label portion 6, a plurality of reduced pressure absorbing portions 9 are recessed and formed at predetermined intervals in the circumferential direction. The decompression absorbing portion 9 includes a bulging region 11 that protrudes outward from the container at a portion surrounded by the inner surface 10 thereof. The length in the height direction of the bulging region 11 is 20 mm to 40 mm, preferably 20 mm to 30 mm. In this embodiment, the bulging region 11 has a substantially square shape, and its length in the height direction is about 23 mm.

  As shown in FIG. 3, the cross-sectional shape of the bulging region 11 is curved in an arc shape so as to protrude outward from the container. The radius of curvature of the cross-sectional shape of the bulging region 11 in the bottle 1 in the normal state before the vacuum absorption by the vacuum absorber 9 is preferably 40 mm (40R) to 160 mm (160R). Further, the bulging amount B1 of the bulging region 11 in the bottle 1 in the normal state is desirably 1 mm or less, and more desirably approximately 0.5 mm.

  As shown in FIGS. 1 and 2, the gripping portion 7 has a constricted shape that continuously decreases in diameter from both ends in the vertical direction to the center, and a multi-sided wall is defined on the side surface.

(bottom)
As shown in FIGS. 1 and 2, the bottom 5 includes a bottom surface 13 that comes into contact with the installation surface when the bottle 1 is erected, and a raised portion 14 that gently rises from the inner edge of the bottom surface 13 toward the central axis XX. A circular recess 15 projecting upward formed at the center of the raised portion 14, a longitudinal groove portion 16 extending from the recess 15 to the peripheral wall 12, and a peripheral wall 12 rising so as to expand upward from the periphery of the bottom surface 13. It is configured.

  A plurality of the longitudinal groove portions 16 are provided at equal intervals in the circumferential direction radially from the recess 15 of the bottom wall 13. The longitudinal groove portion 16 functions as a reinforcing rib that reinforces the strength of the bottom portion 5.

[Other Embodiments]
About the shape of the bulging area | region 11 of the decompression absorption part 9 in the above-mentioned embodiment, as FIG. 4 shows, for example, it is good also as a vertically long substantially rectangular shape provided with a larger area. The length in the height direction of the bulging region 11 in this embodiment is about 28 mm.

  The resin container of the present invention can be suitably used as a container for hermetically filling beverages and seasonings.

DESCRIPTION OF SYMBOLS 1 Bottle 2 Mouth part 3 Shoulder part 4 Body part 5 Bottom part 6 Label part 7 Gripping part 8 Circumferential groove 9 Decompression absorption part 10 Inner side surface 11 Swelling area | region 12 Perimeter wall 13 Bottom face 14 Raised part 15 Depression 16 Vertical groove part

Claims (2)

A mouth part in which the cap is detachable, a shoulder part provided continuously to the mouth part, a trunk part provided continuously to the shoulder part, and a bottom part provided continuously to the trunk part and positioned at the bottom;
The reduced pressure absorption part formed to be depressed in the body part includes a bulging region that protrudes outward from the container in a cross section,
The resin container, wherein the bulging area has a length in the height direction of 20 mm to 40 mm.   2. The resin container according to claim 1, wherein a curvature radius of a cross-sectional shape of the bulging region is 40 mm to 160 mm.

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