| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a multilayered film having a uniform thickness and reduced in the irregularity of optical characteristics or the like. SOLUTION: In the manufacturing method of the multilayered film, a rectangular laminated flow P<SB>0</SB>is formed by laminating at three layers, each of which is composed of at least two molten high-molecular polymers, in a multilayered feed block, forming independent branched flows P<SB>1</SB>and P<SB>2</SB>by dividing the rectangular laminated flow P<SB>0</SB>by the cross section vertical to the laminated surfaces of three layers and rearranging the respective formed branched flows P<SB>1</SB>and P<SB>2</SB>so that the laminated surfaces come into contact with each other in parallel to each other to re-laminate them. The thickness (w) of the outer layer part of the multilayered film is made larger than the thickness (t) of the inner layer part thereof. COPYRIGHT: (C)2007,JPO&INPIT |
