Patent ID: 6402873
Filing Date: 2002-06-11
Classification: B32B,Y10T

Abstract:
A method of manufacturing a laminated thermoplastic resin sheet, which uses a manufacturing apparatus comprising an extruder, a first cooling roll having a surface coated by an elastic material, a second cooling roll spaced from the first cooling roll, a metal endless belt wound between the first roll and the second roll, and a third cooling roll spaced from the second cooling roll but brought into engagement with the first cooling roll through said metal endless belt, comprising the steps of:arranging a first guide roll at a position between the extruder and said first or third cooling roll; extruding a thermoplastic resin sheet in a molten state from the extruder and introducing the extruded thermoplastic resin sheet between the first and third cooling rolls in such a manner as to be brought into engagement with said metal endless belt and said third cooling roll substantially at the same time; applying a back tension from 9.8 N/m to 294.0 N/m to a thermoplastic resin film; introducing the thermoplastic resin film between said metal endless belt and said third cooling roll via said first guide roll so as to laminate the sheet and the film; pressing and cooling continuously said laminated thermoplastic resin sheet in a plane manner by said first and third rolls while elastically deforming said elastic material by a pressing force applied between said first and third rolls; pressing and cooling continuously said laminated thermoplastic resin sheet to the third cooling roll in a plane manner by said endless belt; removing said laminated thermoplastic resin sheet from the metal endless belt; and taking up said laminated thermoplastic resin sheet partially around a third guide roll.