| 摘要 |
PURPOSE:To obtain a foamed plastic molding of a high expansion ratio by a method in which foaming is made while moving the mold using a partly mobile chamber- constituting mold. CONSTITUTION:A horizontally mobile core part 9 is inserted into the concavity 13 of a cavity 7 and supported in a freely reciprocating manner by air cylinders 11 through piston rods 12, and stroke regulating bolts 15 are screwed in the face of pistons 16. At a stage that a piston rod 18 is advanced toward an arrow a, the rods 12 are advanced toward an arrow b, and the volume of a molding chamber 19 is made small, thermoplastic resin granule raw material 23 is charged into a raw material inlet 22 and then expanded by heating from heat medium supply ports 24 and 25. When a core 9 moves in a direction opposite to the arrow b with the rise of pressure inside the molding chamber 19 and the pistons 16 come into contact with the tips of the bolts 15, the movement of the core is stopped and expansion molding is completed according to the volume of the molding chamber at that time. |
