US Patent No. 11,111,344

PROCESS FOR MAKING ABSORBENT TOWEL AND SOFT SANITARY TISSUE PAPER WEBS HAVING NANOFILAMENTS


Patent No. 11,111,344
Issue Date September 07, 2021
Title Process For Making Absorbent Towel And Soft Sanitary Tissue Paper Webs Having Nanofilaments
Inventorship Tobias Ziegenbein, Vancouver (CA)
Assignee Mercer International Inc., Vancouver (CA)

Claim of US Patent No. 11,111,344


1. A process for making an absorbent towel paper web comprising the steps of:(a) providing a papermaking furnish comprising:i) from about 20.1% to about 99.9% by weight of the dry fiber basis of the absorbent towel paper web of a softwood pulp fiber mixture comprising:u) from about 20.0% to about 99.8% by weight of the dry fiber basis of the absorbent towel paper web of softwood pulp fiber;wherein the softwood pulp fiber is optionally refined before being added to the mixture; and,

v) from about 0.05% to about 5.0% by weight of the dry fiber basis of the absorbent towel paper web of strengthening additive; and,

ii) from greater than 0% to about 79.9% by weight of the dry fiber basis of the absorbent towel paper web of a hardwood pulp fiber mixture comprising:w) from about 0.05% to about 79.4% by weight of the dry fiber basis of the absorbent towel paper web of hardwood pulp fibers;wherein the hardwood pulp fiber is optionally refined before being added to the hardwood pulp fiber mixture; and,

x) from about 0.05% to about 20.0% by weight of the dry fiber basis of the absorbent towel paper web of cellulose nano-filaments; and,

iii) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of a fibrillated man-made cellulose;
iv) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of non-wood natural fibers;
v) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of non-cellulosic fibers; and,
vi) optionally refining the blended mixture before or after chemical addition to further develop and create desired fiber and chemical properties; and,

(b) forming a wet fibrous web having a differential density from said paper making furnish; and,
(c) drying said differential density wet fibrous web until said dry differential density wet fibrous web contains not more than about 10% by weight moisture to form the absorbent towel paper web.