PRODUCTION OF POLYPROPYLENE RESIN EXTRUDED FOAMED FINE STRIPE BUNDLE

摘要

PROBLEM TO BE SOLVED: To provide a polypropylene resin extruded foamed fine strip bundle high in closed cell ratio and foaming magnification. SOLUTION: A polypropylene resin extruded foamed fine stripe bundle is produced by melting and kneading a mixture of a specific polypropylene resin of which the elongation viscosity measured in a molten state rises suddenly as strain quantity increases and a foaming agent in an extruder to adjust the same to temp. suitable for foaming and extruding fine strips from an extrusion die having a large number of small holes at low temp. under low pressure to foam them and introducing the foamed fine strips into a cylindrical mold to bundle and fuse them.