| 摘要 |
PURPOSE:To prevent the breakage of a silicon rubber mold without lowering a mold accuracy by a method wherein a thin film is formed on the surface of a master by coating the mixed solution of urethane resin and ethanol on the master. CONSTITUTION:The mixed solution 6 of urethane resin and ethanol is coated on the whole surface of a master 1 by employing a spray gun 5. The thin film of the urethane resin is formed on the surface of the master 1 when a perdetermined period of time has elapsed after coating. In this case, the mixed solution can be coated evenly and the thin film, formed by the coating, can effect the role of parting agent sufficiently regardless of the surface roughness of the master 1. The master 1 is set in a vessel 7 for molding and silicon rubber 2 in a casting vessel 8 is poured into the vessel 7, then, the silicone rubber is taken out of the vessel 7 when a predetermined period of time has elapsed and the silicon rubber is cured whereby the prototype mold 3 of silicon rubber is obtained while the silicon rubber molds 4 are obtained by releasing it from the mold by splitting the mold, however, the breakage of the mold will never be caused. |
