METHOD FOR MANUFACTURING POROUS MULTI-LAYERED PLASTIC FILTER

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a porous multi-layered plastic filter in which adjacent porous layers are strongly integrated with each other and a crack is not generated at a porous part formed in the layers even by expansion and shrinkage. SOLUTION: In the method for manufacturing the porous multi-layered plastic filter in which grain diameters of the adjacent layers are different from each other, thermoplastic grains having different grain diameters are superposed and filled in the same mold, and then are simultaneously subjected to heating, sintering and molding to integrate the layers. COPYRIGHT: (C)2003,JPO