Easy-to-open tubular sealed casing
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United States of America Patent
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May 16, 2006
Grant Date -
Aug 1, 2002
app pub date -
Jul 9, 2001
filing date -
Jan 26, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The ease of opening of a tubular casing is facilitated based on a plastic film comprising three or more layers. The tubular sealed casing (1) for packaging the contents therein is based on a composite plastic film formed into a tubular form by bending the base film into a circular form, overlaying two edges of the bent base film, and heat-sealing the overlaid section so that a not heat-sealed section (8) will be left in an edge section of an upper film when the two edges thereof are overlaid on each other. The casing base film (2) is a composite plastic film comprising three or more layers. In this casing, the peel strength between the outer layer (5) and intermediate layer film (3) is set to a lower level as compared to the peel strength between the inner layer film (4) and intermediate layer film (3). Because of this feature, disruption (12) of the outer layer film (5) from the intermediate film (3) occurs easily, when open the casing in the heat-sealed section (7), and further the outer layer film (5) is peeled (13) from the intermediate film (3), so that the casing can easily be opened.
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