| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a multilayer resin belt which can obtain the belt formed by stacking a plurality of resin layers in high thickness precision by using extrusion molding while reducing the unevenness of the surface caused by foreign substances and the multilayer resin belt obtained by this method. SOLUTION: In the method for producing the multilayer resin belt having a lamination structure comprising at least two resin layers, at least two kinds of molten resin materials constituting each resin layer, through at least two annular passages 4A and 4B formed independently in a molding die 10 by a mandrel 1, an intermediate die ring 2, and an outside die ring 3, after being joined together, are extruded from a die slit 6 to form the lamination structure. External circumferential force is applied to at least one kind of the molten resin material in the annular passages to make the molten resin material flow forcibly in the annular passage 4B, and in the joining part 5 of at least two kinds of the molten resin materials, no external circumferential force is applied to the joining molten resin materials. COPYRIGHT: (C)2009,JPO&INPIT |
