APPARATUS AND METHOD FOR HEATING RESIN SHEET, METHOD FOR PRODUCING RESIN SHEET, AND RESIN SHEET

摘要

PROBLEM TO BE SOLVED: To solve the problem that, since one surface of a resin sheet is heated while a plane-shaped heater is heat-controlled on the basis of the temperature of the approximately middle part of the width of the sheet, although the distortion of the approximately middle part of the width can be reduced, the distortion of the approximately ends of the width cannot be reduced. SOLUTION: The widthwise direction of the resin sheet S is divided into areas 1-5 of a prescribed range, and upper and lower heater units 41 and 42 are divided into units A1-A5 corresponding to the areas 1-5. By controlling the heating of each area 1-5 by radiation thermometers SA1-SA5 and heaters a1-a25 which are set in each unit A1-A5, distortion occurring non-uniformly in the widthwise direction of the resin sheet S can be reduced effectively.