Patent ID: 7674732
Filing Date: 2010-03-09
Classification: D21F,Y10T

Abstract:
1. A felt for papermaking, the felt comprising: a substrate; and batt fiber layers positioned on a wet-paper side of the substrate, the batt fiber layers being composed of three layers of short fibers including (i) a first layer which is an uppermost layer, (ii) a second layer which contacts the uppermost layer, and (iii) a third layer which contacts the second layer, wherein the average fineness of the short fibers of batt fibers in the first layer is 0.5 to 6 dtex, the average fineness of the short fibers of batt fibers in the second layer is 1.5 to 15 dtex, and the average fineness of the short fibers of batt fibers in the third layer is 6 to 30 dtex, wherein the batt fibers are polyamide fibers, wherein the absolute viscosity of a solution of 0.25 g of the batt fibers of the first layer in 50 ml of JIS technical grade 95% sulfuric acid, at 25° C., is 60 to 70 mPa·S, wherein the absolute viscosity of a solution of 0.25 g of the batt fibers of the second layer in 50 ml of JIS technical grade 95% sulfuric acid, at 25° C., is 80 or more mPa·S, and wherein the absolute viscosity of a solution of 0.25 g of the batt fibers of the third layer in 50 ml of JIS technical grade 95% sulfuric acid, at 25° C., is 80 mPa·S or more.