Absorbent sheet made with papermaking fibers with durable curl
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 6, 2007
Grant Date -
Jan 29, 2004
app pub date -
Jul 23, 2003
filing date -
Mar 6, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A process for bleaching high bulk cellulosic fiber and producing a durable elevated curl index includes: (a) concurrently bleaching, heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency generally under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. Preferably, the curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125.degree. F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less. In general, the process is carried out in the presence of saturated steam at a pressure of from about 5 to about 150 psig.
First Claim
Other Claims data not available
