Low compaction, pneumatic dewatering process for producing absorbent sheet
US7416637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2005 |
| Grant date | Aug 26, 2008 |
| Priority date | — |
| Expiry date | Oct 14, 2026 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F11/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A low-compaction method of making an absorbent cellulosic web includes: forming a nascent web from a papermaking furnish; dewatering the nascent web to a consistency of from about 10 to about 30 percent on a foraminous forming support traveling at a first speed; rush-transferring the web at a consistency of from 10 to about 30 percent to an open texture fabric traveling at a second speed slower than the first speed of the forming support; further dewatering the web on the impression fabric to a consistency of from about 30 to about 60 percent by way of (i) combining the open texture fabric bearing said web with a fluid distribution membrane and an anti-rewet felt as the three pass through a nip into a pressure chamber defined in part by a plurality of nip rolls, the fluid distribution membrane bearing against the side of the open texture fabric away from the web, with the anti-rewet felt bearing against the web, and (ii) applying a pneumatic pressure gradient from the distributor membrane through the web thereby dewatering the web; and drying the web. Preferably the process includes the steps of selecting the papermaking furnish and controlling the process such that the dried web h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.