| 摘要 |
<p>Provided is a manufacturing method of polyester resin, a protective sheet used for solar cell and a solar cell module. A rotational speed N of a screw is adjusted in an area range represented by the following formulas in which an extrusion output per unit Y satisfies, so that Y changes continuously, and extrusion amount Q per unit time of melt-mixing polymer resin increases from Qmin to Qmax or decreases from Qmax to Qmin, and thus melt extrusion is carried out (Y : extrusion amount per unit Q/N, Yunder = 9.01 * 10<-7> * D3, Yover = 6.93 * 10 <-6> * D3, D : screw diameter, Q0 : extrusion amount of regular operation, Qmax and Qmin : maximum or minimum extrusion amount of increasing or decreasing). When 0 <= Q <= 0.5*Q0, (Y-Yunder) / Q <= (Yover - Y under) / (0.5 * Q0); when 0.5*Q0 < Q, Y <= Yover; Y >= Yunder; 0.6*Q0 <= Qmax <= 1.2*Q0; 0.15*Q0 <= Qmin <= 0.4*Q0.</p> |
