Disconnecting the extrusion foaming body which possesses the thermoplasticity polyester type resin foaming grain for closed die forging foaming and the production mannered null strand

摘要

PROBLEM TO BE SOLVED: To provide thermoplastic polyester-based resin foam particles which are used for in-mold foaming molding, do not cause foaming irregularity in the foam- molded article, can improve the interfusion of the particles in the in-mold foaming molding, and can easily and efficiently give the in-mold foamed molded article having excellent mechanical strength and so on, and to provide a method of producing the in-mold foamed molded article of the thermoplastic polyester-based resin. SOLUTION: The thermoplastic polyester-based resin foamed particles for in-mold foaming molding, formed by cutting strand form-like extruded foams in a prescribed length to form the approximately columnar products, characterized in that the particles have a water content of 6,000 to 30,000 ppm and an open cell ratio of 5 to 35%. This method of producing the thermoplastic polyester-based resin in-mold foam-molded article, characterized by controlling the water content of the approximately columnar crystalline thermoplastic polyester-based resin foamed particles formed by cutting strand form-like extruded foams in a prescribed length and having an open cell ratio of 5 to 35% to 6,000 to 30,000 ppm and then foam-molding the foamed particles in a mold.