| 摘要 |
PURPOSE:To make it possible to produce smoothly and favorably a transparent synthetic plate excellent in smoothness and thickness uniformity, by using a mold obtained by electroforming using as a master a planar body which is made of a material capable of being removed as a master, the opposite surfaces of which are smooth, and the thickness of which is uniform. CONSTITUTION:In the production of a transparent synthetic resin plate whose opposite surfaces are smooth and whose thickness is uniform by molding a transparent synthetic resin material using a mold, a planar body as a master has a uniform thickness and is made of a material capable of being removed as a master for the production of a mold by electroforming. Although there can be mentioned many examples of such a planar body, as preferable examples can be mentioned a float plate glass, polished plate glass, and a polymethacrylate plate or the like that can be obtained by the injection molding using a mold of glasses. The obtained mold keeps the smoothness and thickness uniformity of the master, and by using the mold, a transparent synthetic resin material is injection molded or compression molded. |
