D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
8/93.38
D21H 23/28 (2006.01) D21C 9/18 (2006.01) D21F 7/06 (2006.01)
Patent
CA 1340148
A method is disclosed for reducing shrinkage during drying of a paper web formed from paper stock. The method includes the steps of adding a surfactant to the paper stock prior to forming the stock into the paper web. The surfactant is dispersed throughout the stock such that the surfactant is intimately mixed with the stock. The surfactant mixed with the stock is supplied to a headbox of a paper forming section and the mixture of stock and surfactant is ejected from the headbox onto a forming wire of the forming section. A first portion of water is drained from the stock such that the paper web is formed on the forming wire. The paper web is led from the forming section to an extended nip press where the web is passed through the extended nip press such that a second portion of water is removed from the web. The pressed web is conducted through a drying section for removing a third portion of water from the formed, pressed web so that the surfactant inhibits bonding between adjacent fibers within the pressed web so that shrinkage of the pressed web during drying is reduced and a dried web of the required caliper is obtained.
540140
Busker Leroy H.
Cronin Dennis
Beloit Corporation
Metso Paper Inc.
Mitsubishi Heavy Industries Ltd.
Ridout & Maybee Llp
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