METHOD OF HEATING AND FORMING THERMOPLASTIC SYNTHETIC RESIN

摘要

PURPOSE:To form a thermoplastic synthetic resin sheet and to make the register in printing easy in a method wherein the thermoplastic synthetic resin sheet is heated and thereafter it is formed, by carrying out uneven heating in such a way that the part where forming is to be done is heated at a temperature higher than the peripheral part thereof. CONSTITUTION:A masking device is mounted on part of a radiation heating type heating apparatus other than the part where forming is to be done. By this heating apparatus, a sheet comprising a foamed polystyrene sheet and a high- impact polystyrene sheet joined on the foamed polystyrene sheet is heated. A pitch pattern has been printed on the high-impact such a way that it is intended that a prescribed pattern would appear in position after forming is carried out. After such uneven heating is carried out, a bowllike container is formed using a mold in the shape of a bowl.