FLAT DIE FOR EXTRUSION MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a flat die for extrusion molding which can suppress the opening of an aperture without degrading the distribution of a flow rate in the width direction. SOLUTION: The flat die 1 for extrusion molding has a slit 11 through which a molten resin passes when the molten resin is extrusion-molded into a sheet. The slit 11 includes a first slit part 11a positioned on the entrance side of the molten resin to the slit 11 and a second slit part 11b which is positioned on the outlet side of the molten resin of the slit 11 and has a rectangular cross section smaller than the cross section perpendicular to the resin passage direction of the first slit part 11a. The first slit part 11a has a clearance whose size is different in the longitudinal direction of the slit 11. The clearance is enlarged from the central part in the longitudinal direction of the slit 11 toward the end. COPYRIGHT: (C)2011,JPO&INPIT