RESIN MOLDING FOR LASER MARKING

PROBLEM TO BE SOLVED: To clarify the contrast between the irradiation part and the non- irradiation part of laser, and improve the visibility of marked parts by providing a coated layer specified in its wall thickness and surface luster with resin having a specified heat conductivity and melting point on the surface with which the laser marking parts of a molding are brought into contact. SOLUTION: The injection mold is used which is formed with a coated layer satisfying simultaneously conditions denoted by (a) and (b) in a mold inner surface, i.e., in a cavity inner surface defined between both molds created by mating the protrusion mold with recess mold. Herein, formation is done with a resin layer consisting of resin having a heat conductivity of 1×10 -30×10 cal/cm.sec deg.C, and a melting point or softening point of 15 deg.C or higher, or having no melting point or softening point (a). For such resin showing these physical values, polyethyleneterephthalate, polytertrafluoroethylene, or the like can be give. The coating layer (b) is made 60% or more in its surface luster, and the resin layer is made 5-1000μm in its wall thickness.