PRODUCTION METHOD OF SYNTHETIC RESIN SHEET, SYNTHETIC RESIN SHEET AND PRODUCTION DEVICE FOR THE SHEET

摘要

Preparation of synthetic resin sheet comprises induction pressing melt resin between a first metal endless belt, cooling the resin between a roll and the first metal endless belt to form a raw sheet and heating pressing tightly the sheet on the outside of a heated coil or heating endless belt. Preparation of synthetic resin sheet comprises induction pressing melt resin between a first metal endless belt attached in a way capable of travelling between a first and second cooling roll covered with elastic material, and a third cooling roll facing the second cooling roll via the belt and partial having mirror surface on external side, cooling the resin between the third roll and the first metal endless belt to form a raw sheet, heating pressing tightly the sheet on the outside of one of a heated coil or heating endless belt, travelling the sheet outside the sheet and the heating belt, and peeling the sheet from the coil and then from the belt. Independent claims are also included for: (1) a similar method wherein a second metal belt partially having external mirror surfaces between a third and fourth cooling roll and travelling at a direction opposite to that of the first belt, and the resin is introduced after pressed outside a die; and (2) apparatus of carrying out the methods.