| 摘要 |
PURPOSE:To prevent lowering of transfer rate because of a soiled mold and enhance filling and transfer properties of a mold skin by forming a film on a molding surface of a mold by means of thermoplastic urethane solution or emulsion and forming a molten layer of thermoplastic vinyl chloride resin powder heat fused with a urethane layer. CONSTITUTION:Thermoplastic urethane solvent or emulsion is applied to a molding surface of a mold and dried, and a urethane layer is formed, and then the temperature is raised and thermoplastic chloride resin powder is filled to form a fused layer and exclusive vinyl chloride resin powder is disposed, while required forced heating from outside is carried out, and a composite layer consisting of thermoplastic urethane layer thus formed and a fused layer of thermoplastic vinyl chloride resin powder is cooled and released from a mold. The thermoplastic urethane should preferably be of 20000 molecular weight or more and its softening point should be in the range of 100-250 deg.C. The average polymerization degree of a soft vinyl chloride resin powder material should preferably be 750-1500. As the mold and the vinyl chloride resin powder are not 1n contact with directly and a stabilizer or the like is prevented to adhere to the mold and a liquid substance is applied to the mold, the transfer properties of the mold is enhanced. |
