PURPOSE: To restrict shearing heat and to save energy by using shallow grooves on the material supply side of the screw of a plastic extruding machine, deep grooves on the material extruding side thereof and, moreover, a tandem extruding device in combination, a two stage screw, a torpedo, etc.
CONSTITUTION: A screw 13 is formed so that the groove is shallow at the lower part of the material supply hole 12 and becomes deep as it goes to the tip part. A cooling and heating device 14 is provided on the outer peripheral surface of a cylinder 11 and a die 17 for molding sheet through a filter 15, a head 16 is fixed to the tip. The material flowing down from the material supply hole 12 is low in viscosity and heating value due to shearing stress is small even in the shallow groove. The figure indicates a single sheet extrusion molding machine by pellet feed. In the 1st stage A section, the material supply part 18 has deep grooves, the tip part 19 has shallow grooves. A melting and kneading torpedo 20 is fitted at the forward part. The 2nd stage B section takes the reverse shape to the 1st stage A section.
IGUCHI KATSUHIRO
NOZAWA KENJI
