PURPOSE: To perform expansion molding by a single process, by injecting resin particles containing a flowing agent into molds having holes which prohibit the unhardened foamed resin from passing through but permit a dispersing medium to pass through.
CONSTITUTION: A certain amount of the slurry of resin particles in a heated and pressurized state is injected into the molds using a plunger, a screw or the like. The resin particles are foamed by the evaporation of the blowing agent, and the foamed particles are fused in the molds to be molded to a shape in conformity with the shape of the molds. During this period, the dispersing medium is discharged through the dispersing medium discharging holes outside of the molds, with part of the dispersing medium evaporated. Together with the dispersing medium, parts of the flowing agent, the dispersant, etc. present in the dispersing medium are also discharged outside of the molds. Thereafter the molds are cooled, and the foamed and molded item is removed from the molds.
HIROZAWA KUNINORI
KUWABARA HIDEKI
| JP42024070A | ||||
| JPS561344A | 1981-01-09 | |||
| JPS492183A | 1974-01-10 | |||
| JP46034915A | ||||
| JPS5825334A | 1983-02-15 |
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