| 摘要 |
<p>PROBLEM TO BE SOLVED: To control defects such as a neck-in and the thickening of both ends of a resin film associated with the neck-in even when production conditions such as resin conditions and operation conditions are changed. SOLUTION: In a method for forming the resin film 11 by extruding the molten resin from an extrusion die 12, the second resin 11B, the elongation viscosity of which is larger than that of the first resin 11A forming the middle part in the widthwise direction of the resin film 11 and which forms both ends in the widthwise direction of the resin film 11, is used.</p> |
