초록 ▼

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

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.

대표청구항 ▼

1. 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 fu

1. 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. 2. The improvement as in claim 1, wherein said plurality of scratches are formed along substantially the entire extent of each of said at least three fused edge surfaces. 3. The improvement as in claim 2, wherein said two sheets are integrally joined along a common edge having opposite ends intersecting separate ones of said at least three fused edge surfaces. 4. The improvement as in claim 1, wherein the density of said plurality of scratches along said at least three fused edges is at least five scratches per centimeter of length along each of said at least three fused edges, said plurality of scratches being nonuniformly and randomly spaced along said at least three fused edge surfaces. 5. The improvement as in claim 4, wherein the density of said plurality of scratches along said at least three fused edge surfaces is at least twenty scratches per centimeter of length along each of said at least three fused edge surfaces. 6. 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. 7. A wound tape as in claim 6, wherein the density of said plurality of scratches is at least five scratches per centimeter of length of each of said side edges, and said plurality of scratches are nonuniformly and randomly spaced along the length of each of said side edges. 8. A wound tape as in claim 7, wherein the density of said plurality of scratches is at least twenty scratches per centimeter of length of each of said side edges. 9. 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. 10. A plastic film product as in claim 9, wherein said laminate comprises a sealed dispensing bag and said plurality of edge surfaces comprise at least three edges sealed by fusion, having said plurality of scratches only therealong. 11. A plastic film product as in claim 9, wherein said laminate consists of a wound tape. 12. A plastic film product as in claim 11, wherein said wound tape comprises a layer of adhesive material on at least one side thereof. 13. A plastic product according to any one of claims 9, 10, 11 or 12, wherein the density of said plurality of scratches is at least five scratches per centimeter of length along each of said plurality of edges, and said plurality of scratches are nonuniformly and randomly spaced along each of said plurality of edges. 14. A plastic film product as in claim 13, wherein the density of said plurality of scratches is at least twenty scratches per centimeter of length along each of said plurality of edges.