US 11,111,344 B2
Process for making absorbent towel and soft sanitary tissue paper webs having nanofilaments
Tobias Ziegenbein, Vancouver (CA)
Assigned to Mercer International Inc., Vancouver (CA)
Filed by Mercer International Inc., Vancouver (CA)
Filed on Sep. 30, 2019, as Appl. No. 16/587,163.
Application 16/587,163 is a continuation of application No. 15/637,048, filed on Jun. 29, 2017, granted, now 10,570,261.
Prior Publication US 2020/0140634 A1, May 7, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. D21H 27/34 (2006.01); D21H 27/30 (2006.01); D21H 21/18 (2006.01); D21H 15/06 (2006.01); D21H 11/18 (2006.01); D21H 11/00 (2006.01); D21H 11/04 (2006.01); D21H 11/20 (2006.01); D21H 13/02 (2006.01); D21H 17/25 (2006.01); D21H 21/20 (2006.01); D21H 27/00 (2006.01); C08J 5/18 (2006.01); C08L 1/06 (2006.01)
CPC C08J 5/18 (2013.01) [C08L 1/06 (2013.01); D21H 11/00 (2013.01); D21H 11/04 (2013.01); D21H 11/18 (2013.01); D21H 11/20 (2013.01); D21H 13/02 (2013.01); D21H 15/06 (2013.01); D21H 17/25 (2013.01); D21H 21/18 (2013.01); D21H 21/20 (2013.01); D21H 27/002 (2013.01); D21H 27/30 (2013.01); D21H 27/34 (2013.01)] 18 Claims
OG exemplary drawing
 
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.