Extrusion mold for polytetrafluoroethylene particle-containing material, extruder for polytetrafluoroethylene particle-containing material, method for producing polytetrafluoroethylene sheet, method for producing polytetrafluoroethylene porous sheet, polytetra Method for producing fluoroethylene sheet-like fired product and method for producing polytetrafluoroethylene porous sheet-like fired product

摘要

PPROBLEM TO BE SOLVED: To provide an extrusion mold for a PTFE particle-containing material which improves the effect for suppressing variation in strength in the direction perpendicular to the extrusion direction and the stretching strength, while maintaining the thickness accuracy, and can produce a wide width PTFE sheet-like baked product. PSOLUTION: The extrusion mold includes a female mold 1 and a male mold 2, the female mold has a hollow internal space, passing therethrough in the vertical direction, and a tapered space formed at the lower part of the internal space, and the male mold has a cylindrical lower part and a tapered shaped distal part. A radial expansion part extending from the upper part to the lower part along the distal part of the male mold and a flow passage for pressing a material having a tubular part extending along the cylindrical lower part of the male mold are provided between the female mold and the male mold by coaxially disposing the male mold in the lower part of the internal space of the female mold so that the distal part of the male mold is directed toward the upper part of the hollow internal space, and the outer wall surface of the distal part of the male mold faces the inner wall surface of the female mold forming the tapered space. PCOPYRIGHT: (C)2011,JPO&INPIT