Plastic film product
AssigneeTaisei Kako Co., Ltd.
InventorHisao Kai
Life of this patent
Estimating the term…
Abstract
A plastic film product, such as a sealed bag, wound film or adhesive tape, has a plurality of random scratches or cuts having notches toward the other side of the film, formed along the edges thereof so as to be shallow and small enough to be invisible to the naked eye in order to reduce resistance to tearing perpendicular to the edges.
Claims14
In a sealed bag formed of plastic film material including two sheets fused together along at least three fused edge surfaces thereof, the improvement wherein a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, are densely formed only on said fused edge surfaces so as to reduce resistance to tearing through said fused edge surfaces perpendicularly thereto without reducing the toughness of interior portions of said sheets.
A wound tape formed of a plastic film material, said tape comprising a plurality of minute scratches, sufficiently shallow and minute so as to be invisible to the naked eye, densely formed only along the entire extents of both side edges thereof so as to reduce resistance to tearing perpendicularly to said side edges, said tape having adhesive formed on at least one side thereof.
A plastic film product, comprising a laminate of plastic film and a metal film, said laminate having a plurality of edges, each of said plurality of edges having a plurality of minute, scratches, sufficiently minute and shallow so as to be invisible to the naked eye, densely formed therealong so as to reduce resistance to tearing perpendicularly to said edges.
Dependencies are inferred from the claim text.