High tensile strength film having constant tear-direction

Details High tensile strength film having constant tear-direction High tensile strength film having constant tear-direction

1995-06-05

1996-10-01

Thomas, Alexander S.

Stock material or miscellaneous articles

Sheet, web, or layer weakened to permit separation through...

428134, 428135, 428136, 430501, 352241, B32B 310, G03C 300

Patent

active

055609660

ABSTRACT:
A high tensile strength film has at least one small aperture or slit for tearing the film in a direction normal to a longitudinal direction of the film. The aperture has at least one apex which has an acute angle and is directed toward a direction normal to a longitudinal direction of the film. The aperture is in the form of a triangle, a polygon, an oval or a crescent moon.

REFERENCES:
patent: 1222925 (1917-04-01), Brewster
patent: 2118519 (1938-05-01), Noack
patent: 3706626 (1972-12-01), Smith et al.
patent: 4340663 (1982-07-01), Mikawa et al.

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