Flat laminated thermoplastic multilayer film and manufacturing m

Details Flat laminated thermoplastic multilayer film and manufacturing m Flat laminated thermoplastic multilayer film and manufacturing m

1989-11-15

1992-03-31

Sluby, P. C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428408, 428324, 428331, 428328, 428220, 428516, 428518, 428520, 428 352, 2641761, B32B 2704, B65D 8500

Patent

active

051007215

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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