| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a foamed resin molded product having a good surface state by preventing defectiveness such as a sink or the like using the foaming of a resin, improving the transfer of a mold, capable of preventing defectiveness such as a weld mark or the like and preventing foam from breaking in a surface. SOLUTION: A resin mixed with a supercritical liquid is injected in a cavity from an injection molding machine in a state that the inner wall surface of the cavity is heated to at least the thermal deformation temperature of a molding resin by allowing steam to flow through a flow channel. After the injection of a predetermined amount of the resin is completed, the supply of steam to the flow channel is immediately stopped to start the supply of cooling water to the flow channel. By this method, the vicinity of the inner wall surface of the cavity is suddenly changed over to a cooling state from a heating state to cool and solidify the resin. The foamed resin molded product having no foam breaking mark on its surface and having good appearance is obtained. COPYRIGHT: (C)2005,JPO&NCIPI |
