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Plastic bottle

a bottle and plastic technology, applied in the field of plastic bottles, can solve the problems of reducing the strength of the bottle, unable to stand up to distribution, and becoming extremely difficult for consumers to hold, and achieve the effect of facilitating holding and strength

Inactive Publication Date: 2009-07-02
THE COCA-COLA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a plastic bottle that can be easily held and strengthened even when reduced in weight. This is achieved by including a constricted portion and a non-constricted portion in the barrel portion of the bottle. The non-constricted portion has a circular cross-sectional shape, which improves ease of holding and makes it easier to open and close the bottle. The constricted portion has a substantially polygonal cross-sectional shape, which enhances lateral and vertical strength in the barrel portion. The constricted portion may also have a circumferential rib that further strengthens it. The non-constricted portion may have a circular cross-sectional shape, which makes it easier to handle in the manufacturing process. The cross-sectional shapes of the upper and lower polygonal surfaces are mutual vertical symmetry centered on the circumferential rib, which alleviates stress concentration between the surfaces. The upper and lower polygonal surfaces may also have concave circumferential ribs to further strengthen them. These technical features improve the strength and ease of holding of the plastic bottle.

Problems solved by technology

Disadvantages of reducing bottle weight by reducing wall thickness have included an overall reduction in bottle strength, such that bottles could not stand up to distribution, and could become extremely difficult for consumers to hold.
The positive pressure used in JP2006-137463 may provide strength for distribution but, because the interior of the bottle returns to normal pressure after the cap is opened, the strength may be greatly reduced when the bottle is opened and holding the bottle may result in squeezing that could cause the contents to overflow out of the bottle.

Method used

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Examples

Experimental program
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exemplary embodiment 1

[0033]As shown in FIGS. 1 and 2, a plastic bottle 1 is formed by a stretch forming method such as biaxial stretch blow molding, using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a primary material. An exemplary version of bottle 1 may have a weight of approximately 18g, a height of approximately 200 mm, and a fully filled capacity of approximately 570 ml.

[0034]Bottle 1 may be washed and sterilized after molding, then filled with a beverage. Exemplary beverages that may be contained in bottle 1 include water, green tea, oolong tea, juice, and other non-carbonated beverages. In general, the internal pressure in the bottle is negative with non-carbonated beverages, making bottle strength weak. To provide strength, concave rib(s) may be formed on the disclosed bottle. For example, in embodiment 1, bottle 1 may have concave ribs 11-18 described below and may, therefore, be appropriate for filling with a non-carbonated beverage. In some case...

exemplary embodiment 2

[0050]FIGS. 9 through 13 illustrate a bottle 100 according to a second embodiment. The main point of difference vs. embodiment 1 discussed above is the constitution of the constricted portion. Below we assign the same reference numerals to those parts of embodiment 2 which are the same as in embodiment 1.

[0051]Bottle 100 may include a constricted portion 110, which may have an approximately dodecagonal cross-sectional shape. The cross-sectional shape is described as “approximately” dodecagonal for the same reason as explained above with respect to embodiment 1. In other embodiments, the cross-sectional shape of constricted portion 110 may approximate polygons other than a dodecagon. Unlike constricted portion 41 in embodiment 1, embodiment 2 does not include circumferential ribs formed on constricted portion 110.

[0052]Constricted portion 110 may have upper and lower polygonal surfaces 112 and 113 centered around a most-constricted, deepest portion 111. As shown in FIG. 13, the cross...

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Abstract

A plastic bottle is provided with a constricted portion and a non-constricted portion contiguous above and below with the constricted portion. One of the constricted portion or the non-constricted portion has a substantially polygonal cross-sectional shape, and the other one of the constricted portion or the non-constricted portion has a circular cross-sectional shape.

Description

TECHNICAL FIELD [0001]The present invention relates to a plastic bottle for storing a liquid, such as a beverage or the like, and, in particular, relates to a plastic bottle that is easy to hold and minimizes the amount of resin used.BACKGROUND ART [0002]A large number of plastic bottles typified by PET bottles are sold as containers for filling with beverages. For example, JP2007-76717 discloses an example of a 500 ml bottle with improved ease of holding. In this bottle, a constricted portion is formed by constriction toward the center of a barrel portion, resulting in a shape that is easy for a consumer to hold, centered on this constricted portion. In order to maintain strength, a rib is arranged in the constricted portion.[0003]Also, JP2005-247393 discloses a large 2 L size bottle. In this bottle, a barrel portion is formed with a rectangular cross-sectional shape, and a waist portion is formed at the vertical center portion of the barrel portion. This bottle also includes a con...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D90/02
CPCB65D1/0223B65D2501/0036B65D23/102B65D1/42
Inventor MATSUOKA, KENSHI
Owner THE COCA-COLA CO
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