METHOD OF MANUFACTURING THERMOPLASTIC RESIN FOAM PARTICLE

摘要

A method of manufacturing thermoplastic resin foam particles, wherein a foaming agent is pressingly injected into a thermoplastic resin melted in an extruder, the melted resin containing the foaming agent is extruded directly into a cooling fluid through a large number of small holes of a die attached to the tip of the extruder, an extruded material is cut by a high-speed rotating cutter upon the extrusion, and the extruded material is cooled and solidified by the contact with the fluid. The melted resin is extruded so that the shearing speed of the melted resin containing the foaming agent is 12,000 to 35,000 sec<-1> and the apparent melt viscosity of the resin is 100 to 700 poise when the melted resin passes the small hole land parts of the die.