Special receptacle or package – Shrink film package
Patent
1994-01-25
1996-05-21
Gehman, Bryon P.
Special receptacle or package
Shrink film package
53442, 229 8701, 229 8705, 206484, B65D 7108, B65D 6528
Patent
active
055181198
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for overwrap-packaging an article using a packaging material which is heat-sealable on both sides thereof and to a resulting package. In particular, where the packaging material is both self-tacky and heat-shrinkable, the packaging material is provisionally sealed by virtue of its self-tackiness, then subjected to a heating environment for heat shrinkage, thereby obtaining a package with its provisionally-sealed portion completely heat-sealed by the heat shrink treatment without the need of an additional heat-sealing treatment.
BACKGROUND ART
Hitherto, various methods have been proposed and practically employed for overwrap-packaging an object with a plastic film.
For instance, packaging methods of the type which seals three sides of a package include one adapted to heat-seal all the three sides of a package by melt-cut sealing or band sealing (heat-sealing using a heating bar, heating continuous belt or heating disk edge to form a band-like sealed portion), one adapted to fin-heat-seal one of the three sides of a package and to melt-cut-seal or band-seal the two remaining sides thereof, and one adapted to electrostatic-seal one side of a package in a lap seal fashion and to melt-cut-seal or band-seal the two remaining sides thereof.
In addition, there is known a packaging method using a stretched film wherein one side of a package is lap-heat-sealed and the two remaining sides thereof are folded onto the bottom surface of the package and fixed thereto by heat sealing.
Such conventional methods, however, involve a problem that where packages each having a heat-sealed portion resulting from melt-cut sealing on the bottom surface thereof are transported or displayed in a stacked fashion, the melt-cut-sealed portion on the bottom surface of an upper package is brought into close contact with the top surface of the underlying package and rubbed thereby due to vibration or the like and is hence prone to rupture.
Although rupture of such kind is hard to occur if a package is fin-heat-sealed on the bottom surface thereof, another problem arises that since the fin-heat-sealed portion of the package is considerably thick and forms a projection on the bottom surface of the package, stacking this package on an object having, for example, a soft surface would frequently leave a mark of the sealed portion on the top surface of the underlying object.
With the package which is electrostatic-sealed on the bottom surface thereof in a lap seal fashion, the problem of the aforementioned marking will not arise because the sealed portion is thin and does not project so much. However, such a package suffers a problem that the sealed portion is likely to be unsealed since it is not fusion-bonded and a problem that if the package contains a liquid such as water or juice, such a liquid is easy to leak from the package. Further, in this case another problem is present that since the packaging material must be an electrostatically chargeable film, such a film is easy to collect dust due to static electricity and is inevitably poor in antifog properties.
Further, with the package using a stretched film wherein one side of the package is lap-heat-sealed and the two remaining sides thereof are folded onto the bottom surface of the package and fixed thereto by heat sealing, there is a drawback that the portions folded onto the bottom surface of the package are wrinkled and, hence, openings are left in the wrinkled portion to frequently permit a liquid to leak therethrough. In addition such a wrinkled portion degrades the appearance of the package.
DISCLOSURE OF THE INVENTION
The present invention has been attained as a result of intensive efforts to solve the foregoing various problems. According to the present invention, such problems are all solved by wrapping an object with a packaging material such as a wrapping film, forming an overlap portion of the packaging material on any one surface, for example, bottom surface, of the object, lap-heat-sealing the overlap portion
REFERENCES:
patent: 3093448 (1963-06-01), Kirkpatrick et al.
patent: 3404508 (1968-10-01), Dreyfus
patent: 3541753 (1970-11-01), Katz
patent: 4178401 (1979-12-01), Weinberg et al.
patent: 4648513 (1987-03-01), Newman
patent: 4700528 (1987-10-01), Bernard
patent: 5176948 (1993-01-01), Nguyen et al.
Kohjin Co. Ltd. Brochure, Concerning "KOHJINKORAP" with partial translation.
PACKPIA 1995/5 pp. 14-17 with partial translation.
Gehman Bryon P.
Kohjin Co., Ltd.
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