| 摘要 |
PURPOSE:To fit the molding wall surface forming the mold cavity of a metal main mold for several ten thousands of times of injection by eliminating the direct wear by injected a resin by a method wherein the molding wall surface is covered with a heat insulating layer, which is made of a heat resisting polymer and has a predetermined thickness, and then grain-like fine uneven surface is formed on the surface of the heat insulating layer with a photosensitive resin. CONSTITUTION:The molding wall surface consisting of the mold cavity of a mold 1 made of steel material is covered with heat insulating layer 2 made of heat resistant resin. The thickness of the heat insulating layer 2 is set to be 0.05-1mm. On the surface of the heat insulating layer 2, a photosensitive polyimide 3 is applied. By exposing ultraviolet rays under the condition that a grain-like masking film 4 is put on the surface of the photosensitive polyimide and dissolving the un-exposed porting with solvent, a heat insulating layer covered mold having the grain-like surface is formed. Thus, the injected synthetic resin does not flow on the heat insulating layer 2 in such a manner that the resin drags the layer, resulting in preventing from directly wearing the molding wall surface and fitting it for several ten thousands of times of injection. |
