PROCESS FOR PRODUCING ORIENTED POLYOLEFIN FILMS WITH ENHANCED PHYSICAL PROPERTIES

PROCESS FOR PRODUCING ORIENTED POLYOLEFIN FILMS HAVING ENHANCED PHYSICAL PROPERTIES ABSTRACT An improved method for the production of polyolefin film by extruding molten film from an annular die in a tubular form into an extrusion zone is disclosed wherein the physical properties of the film are enh...

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Bibliographic Details
Main Author SHARPS, GORDON V., JR
Format Patent
LanguageEnglish
French
Published 27.11.1990
Edition5
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:PROCESS FOR PRODUCING ORIENTED POLYOLEFIN FILMS HAVING ENHANCED PHYSICAL PROPERTIES ABSTRACT An improved method for the production of polyolefin film by extruding molten film from an annular die in a tubular form into an extrusion zone is disclosed wherein the physical properties of the film are enhanced by controlling polymeric crystalline growth. The method comprises providing a liquid quench medium maintained at a constant temperature range in the extrusion zone immediately adjacent the annular die, extruding the molten film directly into the liquid quench medium, and then orienting the quenched film in a tubular bubble whereby the size and amount of crystalline growth is controlled.
Bibliography:Application Number: CA19860502522