| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an injection foamed molding, which has a beautiful surface without any appearance defectives, has a thin nonfoamed layer, has a uniform fine foaming layer and further has a higher expansion ratio. <P>SOLUTION: The method of manufacturing injection foamed molding comprises: a first mold opening process of injecting a molten mixture comprising a thermoplastic resin and a foaming agent into a mold clearance which is set by a movable mold so as to get to a clearance t<SB>0</SB>smaller than a cavity clearance t<SB>2</SB>on the final product shape position and moving the movable mold to the cavity clearance t<SB>1</SB>with a prescribed speed immediately after completing the charging of the molten mixture into the mold clearance; and a second mold opening process of moving the movable mold from the cavity clearance t<SB>1</SB>to the cavity clearance t<SB>2</SB>, wherein the mold surface temperature is set to be a temperature of the load twist temperature of the thermoplastic resin or more, at least at a point of time of starting of injection, and the cooling is caused to start at an arbitrary point of time from the completion of charging up to the completion of second mold opening process. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
