Patent ID: 6280570
Filing Date: 2001-08-28
Classification: D21H,Y10T

Abstract:
A process for the manufacture of a soft, high-bulk cellulosic, single-ply absorbent paper product having a basis weight of at least about 12.5 lbs./3000 square foot ream which process comprises:providing a moving foraminous support;providing a headbox adjacent said moving foraminous support adapted to form a nascent wet laid web by depositing furnish upon said moving foraminous support;providing wet pressing means operatively connected to said moving foraminous support to receive said nascent web and for dewatering of said nascent web by overall compaction thereof;providing a Yankee dryer operatively connected to said wet pressing means and adopted to receive and dry the dewatered nascent web;supplying a furnish to said headbox controlled so that the cellulosic fibers incorporated in the furnish of the web comprise:(a) at least about 20% by weight of the fibers in the web have a coarseness exceeding 23 mg/100 m;(b) at least about 20% by weight of the fibers in the web have a coarseness of less than about 12 mg/100 m;(c) the weight average coarseness to length ratio of the fibers in the web is less than about 8.5 mg/100 m/mm; andwet pressing said nascent web;transferring said nascent web to said Yankee dryer, adhering said web to said Yankee, and creping said web from said Yankee;recovering a creped, dried, absorbent, single-ply paper product; andcontrolling the relative amounts of the temporary wet strength agent and the nitrogenous softener/debonder such that said single-ply, absorbent paper product exhibits:a specific total tensile strength of between 40 and 200 grams per 3 inches per pound per 3000 square foot ream, a cross direction specific wet tensile strength of between 2.75 and 20.0 grams per 3 inches per pound per 3000 square foot ream, the ratio of MD tensile to CD tensile of between 1.25 and 2.75, a specific geometric mean tensile stiffness of between 0.5 and 3.2 grams per inch per percent strain per pound per 3000 square foot ream, a friction deviation of less than 0.250, and a sidedness parameter of less than 0.30.