Method of providing papermaking fibers with durable curl
US6899790B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 2001 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Feb 27, 2021 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H11/16
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for producing high bulk cellulosic fiber exhibiting a durable elevated curl index includes: (a) concurrently heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency 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. 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° 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.