| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a multilayered intermediate film capable of effectively reducing the labor of washing work caused when a product to be manufactured is changed over or the amount of a transparent resin used in washing even in case that manufacturing equipment is used as combination equipment of a transparent intermediate film and a functional intermediate film such as a colored intermediate film. <P>SOLUTION: A transparent polyvinyl acetal resin (A) containing a plasticizer is supplied to a film forming mold from a first main extruder while a polyvinyl acetal resin (B) containing an additive component different from that of the polyvinyl acetal resin (A) supplied from the first extruder is supplied from a second extruder to the conduit, which has a slit having the same width as a mold, inserted in the flow channel of the film forming mold to extrude a laminate having a three-layered structure wherein the layer of the polyvinyl acetal resin B is held between the layers comprising the polyvinyl acetal resin (A). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
