Bottles and jars – Closures – Retained by bonding or adhesive means
Patent
1999-05-11
2000-12-26
Cronin, Stephen K.
Bottles and jars
Closures
Retained by bonding or adhesive means
215270, 215276, B65D 3900
Patent
active
061644706
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hermetic seal and a wide-mouthed bottle sealed by the seal and more particularly to a seal for sealing a mouth of a synthetic resin wide-mouthed bottle having a body portion thinly formed by stretch blow molding and a wide-mouthed bottle sealed by the seal.
BACKGROUND ART
Bottles and wide-mouthed bottles, which are formed by stretch blow molding of injection molded preform, have a thinly formed body portion with a thickness of about 0.3 mm. Because of it, if a mouth of the bottle is sealed by a cap immediately after the bottle is filled with heated contents, the body portion is pulled inside and deformed resulting from a reduced pressure inside the bottle by cooling.
This deformation tends to appear intensively in the thinnest portion resulting from a difference in a thickness distribution of the bottle body portion, and the appearance of the bottle is extremely impaired. In the bottle and the wide-mouthed bottle having a body portion with a circular shaped horizontal section, in order to solve this problem, the body portion is formed to have a polygonal shaped horizontal section and a body wall portion is formed in panel surfaces which are apt to bend inside. This not only can prevent the partial deformation caused by a reduced pressure, but also can enhance the appearance by bending and deforming the panel surfaces in the body wall portion evenly.
A degree of bending of this panel surface is proportional to an area of the panel surface. In contrast with bottles to store fluids such as drinking water, and juice, however, in wide-mouthed bottles to store contents with viscosity including jam, peanut butter, and honey, the contents are apt to remain in corner portions inside created by the formation of the panel surfaces. As a depth of the corner portions increases, it becomes more difficult to take out the contents with a spoon and the like. In addition, a label will be affixed around the body portion. For a number of reasons including them, an area allowed to form a panel surface is limited, and thereby new means capable of preventing the deformation caused by a reduced pressure in the body portion, which do not use the panel surfaces, are desired.
DISCLOSURE OF THE INVENTION
The present invention was designed to meet the above mentioned requirements. An object of the invention is to provide a hermetic seal for a wide-mouthed bottle formed by stretch blow molding and a wide-mouthed bottle sealed by the seal, which have a capability of preventing deformation caused by a reduced pressure in a body portion. The capability is provided by making a seal for sealing a mouth of the wide-mouthed bottle stretchable in response to a reduced pressure inside the bottle resulting from cooling of contents.
The present invention for attaining the above mentioned object is characterized by providing a hermetic seal for a wide-mouthed bottle formed by stretch blow molding; the hermetic seal is comprised of a flat peripheral portion and a stretchable portion inside the flat portion. In addition, the stretchable portion formed at this time is formed as bellows with alternate multiple mountain and valley portions formed by bending.
Here, it is preferable that the seal is comprised of a laminated sheet constituted of an aluminum sheet or an aluminum foil as a base, to which a synthetic resin film is laminated.
It is also preferable that the bellows are shaped concentrically or spirally, and that a difference in height between the mountain portion and the valley portion of the bellows is from about 1 mm to about 1.5 mm and an interval between the mountain portion and the valley portion adjacent thereto is from about 4 mm to about 6 mm.
Moreover, this invention is characterized by providing a wide-mouthed bottle, wherein a mouth thereof is sealed by a hermetic seal; a body portion thereof is thinly formed by stretch blow molding; the hermetic seal has a flat peripheral portion and a stretchable bellows inside the flat portion with alternate multiple mountain and valley po
REFERENCES:
patent: 2040798 (1936-05-01), Schoonmaker
patent: 2449014 (1948-09-01), Shaffer
patent: 4122964 (1978-10-01), Morris
patent: 4408694 (1983-10-01), Mueller
patent: 4533059 (1985-08-01), Kapolas et al.
patent: 4721219 (1988-01-01), Dullabaun et al.
patent: 5119962 (1992-06-01), Vercillo et al.
A. K. Technical Laboratory Inc.
Cronin Stephen K.
Huang Jiawei
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