To prevent deformation due to a difference in temperatures between a surface and a rear face when a thermoplastic synthetic resin plate is cooled in a decorating process of the thermoplastic synthetic resin plate by heat-transfer paper.
Heat-transfer is performed by mounting the heat-transfer paper 1 on a surface of the thermoplastic resin plate 4 and hot-pressing. The plate is cooled with the heat-transfer paper 1 attached after hot-pressing, so that the entire plate is uniformly cooled by allowing more heat of the plate 4 to escape from a rear face side. Thereafter the heat-transfer paper 1 is peeled off thereby preventing deformation due to cooling of the thermoplastic synthetic resin plate 4. Thus a large difference in thermal expansion and contraction does not occur between the surface and the rear face, resulting in no deformation such as a warp. Therefore, it is not necessary to correct the deformation such as the warp by preheating in subsequent vacuum forming or the like, thereby attaining improved productivity.
HOKAO SHIGEAKI
GONDO KEIJI
