Stock material or miscellaneous articles – Sheet – web – or layer weakened to permit separation through...
Patent
1983-02-28
1985-06-11
Thomas, Alexander S.
Stock material or miscellaneous articles
Sheet, web, or layer weakened to permit separation through...
428156, 428167, 428213, 206620, 206634, B32B 330
Patent
active
045228540
ABSTRACT:
Disclosed is plastics film containing a tear strip and a method for producing it in which the film is co-extruded with a bead which adheres to the film surface. Because of the heat retained by the bead, blown expansion of the film following extrusion causes the film to undergo a gauge reduction along and adjacent to the bead which provides a preferential tear line for the film.
REFERENCES:
patent: 3034941 (1962-05-01), Hessenthaler et al.
patent: 3535409 (1970-10-01), Rohde
patent: 3619395 (1971-11-01), Skendzic
patent: 3812002 (1974-05-01), Lurie
Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Thomas Alexander S.
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