Patent ID: 7951266
Filing Date: 2011-05-31
Classification: D21F,D21H

Abstract:
1. A method of making absorbent cellulosic sheet with increased wet/dry CD tensile ratio comprising: a) preparing an aqueous furnish consisting essentially of cellulosic papermaking fibers in aqueous suspension having a consistency of 3 percent or more; b) treating the aqueous furnish at 3 percent or more consistency with debonder; c) adding a permanent wet strength resin to the aqueous furnish in an amount of from about 5 lbs of permanent wet strength per ton of papermaking fiber to about 50 lbs of permanent wet strength resin per ton of papermaking fiber, the step of adding a permanent wet strength agent to the aqueous furnish being carried out subsequent to the step of treating the aqueous furnish with debonder; d) diluting the aqueous furnish to a consistency of less than the consistency at which the furnish was treated with debonder; e) depositing the diluted aqueous furnish onto a foraminous support traveling in a machine direction at a wire speed by way of a jet of the diluted aqueous furnish having a jet velocity in the machine direction; f) dewatering the furnish on the foraminous support to form a nascent web; g) wet-pressing the nascent web onto a rotating cylinder; and h) drying the web to produce the cellulosic sheet; wherein the steps of dewatering, wet-pressing and drying the web as well as the jet to wire velocity delta are controlled and the furnish, debonder, and permanent wet strength resin are selected and utilized in amounts such that the absorbent cellulosic sheet has a wet/dry CD tensile ratio of greater than 30 percent and an MD/CD dry tensile ratio of less than 1.5.