GRANULATION DIE, GRANULATOR, AND METHOD FOR PRODUCING FOAMABLE THERMOPLASTIC RESIN PARTICLE

摘要

A granulation die (1) used in a granulator (T) for performing granulation with use of underwater hot-cutting system comprises a resin discharge surface (13) provided in contact with a cooling medium, a plurality of resin channels (14, 14, ...) communicating with an extruder (2), nozzles (15, 15, ...) communicating with the resin channels (14) and opening to the resin discharge surface (13), and a plurality of cartridge heaters (17) and short heaters (18) provided near the resin discharge surface (13). The resin channels (14) are arranged along the circumference of a virtual circle on the resin discharge surface (13), and the cartridge heaters (17) and short heaters (18) are arranged on the opposite sides in the circumferential direction of circumference of the resin channel (14) so as to traverse the circumference while directing the longitudinal direction thereof toward the radial direction of the circumference. In this granulation die with use of hot-cutting method, clogging of nozzle can be prevented, and particles having uniform diameter can be efficiently produced.