Flat laminated thermoplastic multilayer film and manufacturing method of the same
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United States of America Patent
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Mar 31, 1992
Grant Date -
N/A
app pub date -
Nov 15, 1989
filing date -
Nov 17, 1988
priority date (Note) -
Expired
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Abstract
A laminated film which comprises a pair of coextruded multilayer inflation film layers disposed symmetrically and joined by blocking, wherein the inner layers are joined by blocking are composed of a resin having a Vicat softening point of lower than 120.degree. C., and a method of manufacturing the above film which comprises extruding a coextruded multilayer inflation film from an extruder at a temperature of the molten resin forming the inner layer being higher than the Vicat softening point of the resin by more than 50.degree. C., and joining the inner layer of the inflation film by blocking. A laminated film laminated by blocking can stably be produced, and the laminated film is excellent in physical strength and bag rupture strength.
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