Easy-to-open tubular sealed casing

Details Easy-to-open tubular sealed casing Easy-to-open tubular sealed casing

2006-05-16

2006-05-16

Nolan-Rayford, Sandra M. (Department: 1772)

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

C428S035700, C428S347000, C428S349000

Reexamination Certificate

active

07045183

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.

REFERENCES:
patent: 4399839 (1983-08-01), Hutschenreuter et al.
patent: 5459978 (1995-10-01), Weiss et al.
patent: 5860744 (1999-01-01), Schulz
patent: 6238788 (2001-05-01), Bradt
patent: 0282 773 (1988-09-01), None

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