FELT FOR PAPERMAKING

摘要

[Problem to be solved] To provide a felt for papermaking which is less prone to be crushed during operation of high speed paper machine, enters promptly stable papermaking after starting the machine, assures durability, and maintains surface smoothness. [Solving Means] Provided is a felt for papermaking having a substrate, and batt fiber layers, positioned on the wet-paper side of the substrate, being composed of at least three-layers of short fibers: a first layer as the uppermost layer; a second layer contacting with the uppermost layer; and a third layer contacting with the second layer, wherein the average fineness of the short fibers of the batt fibers in each batt fiber layer is: 0.5 to 6 dtex, preferably 1 to 3 dtex, for the first layer; 1.5 to 15 dtex, preferably 3 to 10 dtex, for the second layer, coarser than the fineness in the first layer; and 6 to 30 dtex, preferably 10 to 15 dtex, for the third layer, coarser than the fineness in the second layer. When the batt fibers are polyamide fibers, the absolute viscosity in a solution of 0.25 g of the batt fibers in the first layer in 50 ml of JIS technical grade 95% sulfuric acid, at 25°C, is preferably 60 to 70 mPa. S, and the absolute viscosity of a solution of 0.25 g of the batt fibers in the second layer and in the third layer, respectively, in 50 ml of the sulfuric acid, at 25°C, is preferably 80 mPa · S or more. The batt fibers in the second layer and the batt fibers in the third layer preferably penetrate the substrate while entangling therebetween, and the batt fibers in the first layer preferably do not penetrate the substrate while entangling with the batt fibers in the second layer and in the third layer.