Patent ID: 7427372
Filing Date: 2008-09-23
Classification: B29C,B29K,B29L

Abstract:
1. A method for producing a thermoplastic synthetic resin sheet or film by cold-rolling a synthetic resin material continuously supplied and fed from a die to produce a thermoplastic synthetic resin sheet or film of a predetermined thickness, comprising the steps of: supplying and feeding a synthetic resin material between an outer peripheral surface of a rotating metallic casting roller and a flexible tubular metallic seamless casting sleeve entrained around first and second support rollers confronting the outer peripheral surface of the casting roller and a third support roller disposed at a greater distance from the outer peripheral surface of the casting roller than the first and second support rollers so that the casting sleeve circulates along an arcuate path while contacting a part of the outer peripheral surface of the rotating casting roller; continuously casting a thermoplastic synthetic resin sheet or film by nipping and pressing the synthetic resin material with the casting roller and the casting sleeve; and adjusting a distance for nipping and pressing the synthetic resin material by the casting roller and the casting sleeve in a circumferential direction along the outer peripheral surface of the casting roller and in accordance with a peeling resistance of the synthetic resin material; wherein the step of adjusting a distance for nipping and pressing the synthetic resin sheet or film with the casting sleeve is carried out by rotating the second support roller confronting the casting roller at the downstream side, around the first support roller confronting the casting roller near the die in such a direction that the second support roller is moved toward and away from the casting roller.