Method for producing a filler-containing polytetrafluoroethylene porous body

PROBLEM TO BE SOLVED: To provide a manufacturing method capable of obtaining a filler-containing PTFE porous body excellent in production efficiency, having no problem of strength even if a filler is highly compounded and enabling a long sheet. SOLUTION: First, an extrusion molding machine 101 is filled with a mixture 10 of PTFE, the filler and a molding aid and the mixture 10 is subjected to extrusion molding so as to be extruded in a first extrusion direction (MD) 201 while the extrusion molding machine 101 is filled with the extrusion molded object 20 obtained by this extrusion direction so as to extrude the extrusion molded object 20 in the second extrusion direction (TD) 301 crossing the first extrusion direction (MD) at a right angle to subject the same to extrusion molding. Then, the extrusion molded object 30 is subjected to rolling treatment and the molding aid is further removed. COPYRIGHT: (C)2006,JPO&NCIPI