| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sheet roll of a polyester resin, etc., which is excellent in rolled-up shape and a method for manufacturing the roll. SOLUTION: The sheet is molded by extruding a raw material by using a die having a plurality thickness adjusting means. As regards the power spectrum of a thickness profile in the widthwise direction of the sheet, the average value X1 of power below a prescribed number (a) of waves is 0.2*T2, and X1 is smaller than the average value X2 of power of at least the number of waves (a). T is the average thickness (μm) of the sheet.</p> |
