METHOD OF AND APPARATUS FOR MAKING POLYMERIC FILM

A process and apparatus are provided for making polymeric film wherein flowable polymeric material is extruded in molten form through a die, having a pair of die lips divided into thermally isolated sections, and which include selectively controlling, by heating or cooling, the temperature of the is...

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Bibliographische Detailangaben
1. Verfasser:	MULES, RICHARD D
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTROLLING MAKING GRANULES OR PREFORMS PERFORMING OPERATIONS PHYSICS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS REGULATING SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A process and apparatus are provided for making polymeric film wherein flowable polymeric material is extruded in molten form through a die, having a pair of die lips divided into thermally isolated sections, and which include selectively controlling, by heating or cooling, the temperature of the isolated sections in response to film thickness measurements, whereby to improve thickness uniformity of the film so formed.