| 摘要 |
<p>PURPOSE:To make it possible to manufacture a paper-base decorating type synthetic resin injection-molded item at low cost by a method wherein papers and thin layer material are put one upon the other and arranged between molds so as to face the papers to an injection port and, after molten synthetic resin is injected, cooled down and solidified, the thin layer material is separated from the papers and the molds. CONSTITUTION:When synthetic resin is molded with an injection mold, in which a required cavity 3 is formed between a male mold 1 and a female mold 2, papers 5 and thin layer material 6, the strength of which is higher than the papers, are arranged on a parting face 20 under the conditions that the papers and the tin layer material are put one upon the other without being bonded to each other so as to face the papers 5 to an injection nozzle 4. By injecting molten synthetic resin 7 from the injection nozzle 4 in the cavity 3, the cavity 3 is filled with the synthetic resin 7, resulting in bonding the papers 5 onto the surface of the resin and bringing the thin layer material 6 at the back of the papers 5 into close contact with the inner surface of the male mold 2. The papers 5 are neither broken by the injection pressure and resin temperature nor stuck to the female mold surface and completely bonded only to the surface of the resin. At the releasing of the mold, the thin layer material 6 automatically separate from both the papers 5 and the molds by means of parting force.</p> |
