Patent ID: 8632719
Filing Date: 2014-01-21
Classification: B29C

Abstract:
1. A method for producing an injection-molded product having a patterned surface, the method comprising: a step of placing, in an injection mold, a heat-shrinkable resin sheet having a region A and a region B which have different surface temperatures when irradiated with infrared rays; a step of integrating the placed resin sheet with an injection molding resin by injecting the injection molding resin into the mold; before the step of placing or before the integration step, a step of irradiating the resin sheet with infrared rays so that surface temperatures of the region A and the region B are different from each other and so that the surface temperature of at least the region A is equal to or higher than an orientation release stress inflection point temperature T of the resin sheet, thereby forming a difference in thickness between the region A and the region B which leaves a pattern on the resin sheet; and after the integration step, a step of separating the resin sheet from the injected resin wherein the pattern of the resin sheet is transferred to a surface of the injected resin.