| 摘要 |
PURPOSE:To make is possible to produce a porous molded object with uniform weld strength and favorable quality, by once protruding a plunger by a predetermined distance into a cavity upon completion of filling with foamable resin particles, thereby forming a gap between the particles and a wall surface of a mold, and retracting the plunger. CONSTITUTION:In a step of filling a cavity in a metallic mold 20 with foamable resin particles 30 by use of a filling gun 1, a mouth end 8 of a plunger of the gun 1 is protruded by a predetermined distance into the cavity 20 upon completion of filling with the particles 30. By the protruding action of the mouth end 8 of the plunger, the particles 30 present at the protruding part are diffused. Next, the mouth end 8 of the plunger is retracted until it becomes flush with a mold wall surface 20a fronting on the cavity of the mold 20. A part of the layer of the particles is recessed by being pressed by the plunger 8, forming a gap between the particle layer and the wall 20a, and steam flows into the gap to heat the particles 30 at that part. Therefore, the particles 30 at the part are restored to fill up the gap, and are welded to each other to the same degree as the resin particles 31 at other parts. |
