| 摘要 |
PROBLEM TO BE SOLVED: To reduce the adhesion due to the biting developed by the shrinkage of a molding resin and, at the same time, prevent the crack and separation of a surface layer from developing due to the heat of the molding resin by a method wherein a plurality of layers are formed on the surface of a formed mold. SOLUTION: A stereo-lithographically formed mold 12 has an easily broken projecting part 12. On the surface of the stereo-lithographically formed mold 12, three film layers 13a, 13b and 13s are formed. The stereo-lithographically formed mold 12 is made of urethane acrylate added with inorganic substance. The first film layer 13a is made of zinc. The second film layer 13b is made of aluminum. The third film layer or surface layer 13s is made of nickel. The nickel employed in the surface layer is excellent in the releasability of the molding resin and has a small surface roughness. For example, the surface roughness of the surface layer 13s is set to be 10μm or less. Due to the small affinity between the molding resin and the film material of the surface layer 13s and the small surface roughness of the surface layer, through a resin molded article contacts with the surface layer 13s of the stereo-lithographically formed mold 12, the adhesion of the molding resin to the mold is small, resulting in preventing the breakage of the mold at the ejection of the article from occurring. |
