PRODUCTION METHOD OF EXPANSION-MOLDED ARTICLE OF THERMOPLASTIC RESIN AND APPARATUS THEREFOR

摘要

PRODUCTION METHOD OF EXPANSION-MOLDED ARTICLE OF THERMOPLASTIC RESIN AND APPARATUS THEREFOR An expansion-molded article of a thermoplastic resin is produced while maintaining pre-foamed particles, which have been applied with an internal pressure, always under pressure from the application of the internal pressure thereto until their molding so as to avoid drop of internal pressure of the particles. The production method and apparatus of this invention enable to produce expansion molded articles with minimized dimensional variations. Furthermore, the resultant articles have good properties and surface appearance.