US 11,111,344 B2Granted

Process for making absorbent towel and soft sanitary tissue paper webs having nanofilaments

AssigneeMercer International Inc.

InventorTobias Ziegenbein

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Abstract

Processes for making absorbent towel paper and soft sanitary tissue paper webs are provided. The processes provide the steps of: (a) providing a papermaking furnish, (b) forming a wet fibrous web having a differential density from the paper making furnish; and, (c) drying the differential density wet fibrous web to not more than about 10% by weight moisture. Step a) provides: i) from about 20.1% to about 99.9% by weight of a softwood pulp fiber mixture; and, ii) from greater than 0% to about 79.9% by weight of a hardwood pulp fiber mixture. Step i) provides u) from about 20.0% to about 99.8% by weight of softwood pulp fiber; and, v) from about 0.05% to about 5.0% by weight of strengthening additive. Step ii) provides w) from about 0.05% to about 79.4% by weight of hardwood pulp fibers; and, x) from about 0.05% to about 20.0% by weight of cellulose nano-filaments.

Claims18

Dependent claims

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.

19 more elements

A process for making a soft sanitary tissue paper web comprising the steps of:

(a) providing a papermaking furnish comprising:
i) from greater than 0% to about 79.4% by weight of the dry fiber basis of the soft sanitary tissue paper web of a softwood pulp fiber mixture comprising:
u) from greater than 0% to about 79.3% by weight of the dry fiber basis of the soft sanitary tissue 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 3.0% by weight of the dry fiber basis of the soft sanitary tissue paper web of strengthening additive;
and,
ii) from about 20.6% to about 99.9% by weight of the dry fiber basis of the soft sanitary tissue paper web of a hardwood pulp fiber mixture;
w) from about 20.5% to about 99.8% by weight of the dry fiber basis of the soft sanitary tissue 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 soft sanitary tissue paper web of cellulose nanofilaments;
and,
iii) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue paper web of a fibrillated manmade cellulose;
iv) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue paper web of non-wood natural fibers;
v) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue 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 web contains not more than about 10% by weight moisture to form the soft sanitary tissue paper web.

19 more elements

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:
y) from about 0.05% to about 79.4% by weight of the dry fiber basis of the absorbent towel paper web of a hardwood pulp fiber;
wherein the hardwood pulp fiber is optionally refined before being added to the hardwood pulp fiber mixture;
and,
z) from about 0.05% to about 20.0% by weight of the dry fiber basis of the absorbent towel paper web of a blend of micro- and nano-sized cellulose filaments, wherein the blend comprises:
A) at least about 40% by weight of the blend of cellulose nano-filaments;
B) at least about 20% by weight of the blend of intact fibrillated fibers;
and,
C) at least about 10% by weight of the blend of cellulosic fines;
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;
and,
v) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of non-cellulosic fibers;
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 web contains not more than about 10% by weight moisture to form the absorbent towel paper web.

22 more elements

A process for making a soft sanitary tissue paper web comprising the steps of:

(a) providing a papermaking furnish comprising:
i) from greater than 0% to about 79.4% by weight of by weight of the dry fiber basis of the soft sanitary tissue paper web of a softwood pulp fiber mixture comprising:
u) from greater than 0% to about 79.3% by weight of the dry fiber basis of the soft sanitary tissue paper web of softwood pulp fiber;
wherein the softwood pulp fiber is optionally refined before being added to the mixture;
and,
w) from about 0.05% to about 3.0% by weight of the dry fiber basis of the soft sanitary tissue paper web of strengthening additive;
and,
ii) from about 20.6% to about 99.9% by weight of the by weight of the dry fiber basis of the soft sanitary tissue paper web of a hardwood pulp fiber mixture comprising:
y) from about 20.5% to about 99.8% by weight of the dry fiber basis of the soft sanitary tissue paper web of hardwood pulp fibers;
and,
z) from about 0.05% to about 20.0% by weight of the by weight of the dry fiber basis of the soft sanitary tissue paper web of a blend of micro- and nano-sized cellulose filaments, wherein the blend comprises:
A) at least about 50% by weight of the blend of cellulose nano-filaments;
B) at least about 20% by weight of the blend of intact fibrilated fibers;
and,
C) at least about 20% by weight of the blend of cellulosic fines;
and,
iii) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue paper web of a fibrillated manmade cellulose;
iv) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue paper web of non-wood natural fibers;
and,
v) optionally up to about 20% by weight of the dry fiber basis of the soft sanitary tissue paper web of non-cellulosic fibers;
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 web contains not more than about 10% by weight moisture to form the soft sanitary tissue paper web.

21 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/587,163Filed 30 Sep 2019 · continuation
Priority: 29 Jun 2017
Published: US 2020/0140634 A17 May 2020
Granted: 7 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
C08L 1/06
Cellulose; Modified cellulose: cellulose hydrate
D21H 11/00
Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
D21H 11/04
Chemical or chemomechanical or chemothermomechanical pulp: kraft or sulfate pulp

Family

Application15/637,048Parent of this continuation · filed 29 Jun 2017
US 2020/0140634 A1Pre-grant publication · published 7 May 2020
US 10,570,261 B2Parent of this continuation
US 2018/0002502 A1Published application
US 11,111,344 B2This patent

From the US filing history. Foreign family members aren’t listed.