| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a multilayered film by which thickness of the multilayered film can be efficiently controlled to a thickness with good handling properties while optical characteristics are kept and the film can be efficiently produced, and an apparatus for manufacturing it. SOLUTION: The method for manufacturing the multilayered film in which at least eleven layers of layers A comprising a resin A and layers B comprising a resin B are laminated and at least one of outermost layers is a thick film layer and layers except the thick film layer are thin film layers, is characterized in that the resin A and the resin B are separately melted in extruders and the melted resins are respectively introduced into flow paths in multilayered feed blocks to form multilayered melted thin film layers, and at least one melted resin between the melted resin A and the melted resin B is made to branch from the melted resins introduced into the multilayered fed blocks and is joined to the outside of the multilayered melted thin film layers through a flow path for the outermost layer and is extruded into a sheet in the multilayered direction of the layers A and the layers B in the thickness direction from a successive die, and then, the film is cooled and solidified on a casting drum to form an undrawn film and this undrawn film is drawn in at least one direction of the longitudinal and transverse directions. COPYRIGHT: (C)2003,JPO |
