US Pat. No. 10,463,205

PROCESS FOR MAKING TISSUE OR TOWEL PRODUCTS COMPRISING NANOFILAMENTS

Mercer International Inc....

1. A process for making an absorbent towel paper web comprising the steps of:(a) providing a papermaking furnish comprising:
i) from about 45% to about 90% by weight of the dry fiber basis of the absorbent towel paper web of a softwood pulp fiber mixture, the softwood pulp fiber mixture comprising:
u) from about 20% to about 89.9% 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 softwood pulp fiber mixture;
v) from about 0.05% to about 20% by weight of the dry fiber basis of the absorbent towel paper web of cellulose nano-filaments;
w) from about 0.05% to about 5.0% by weight of the dry fiber basis of the absorbent towel paper web of strengthening additive,
ii) from about 10% to about 55% by weight of the dry fiber basis of the absorbent towel paper web of a hardwood pulp fiber mixture;
iii) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of a fibrillated manmade cellulose; and
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,
(b) forming a differential density wet fibrous web from said paper making furnish; and,
(c) drying said differential density wet fibrous web until said dry differential density fibrous web contains not more than about 10% by weight moisture to form the absorbent towel paper web.
US Pat. No. 10,570,261

PROCESS FOR MAKING TISSUE OR TOWEL PRODUCTS COMPRISING NANOFILAMENTS

Mercer International Inc....

1. A process for making an absorbent towel paper web comprising the steps of:(a) providing a papermaking furnish comprising:
i) from about 45% to about 90% 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 88.5% 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 about 10% to about 55% by weight of the dry fiber basis of the absorbent towel paper web of a hardwood pulp fiber mixture comprising;
w) from about 9.9% to about 54.9% by weight of the dry fiber basis of the absorbent towel paper web of hardwood pulp fibers; 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 nanofilaments; and,
iii) optionally up to about 20% by weight of the dry fiber basis of the absorbent towel paper web of a fibrillated manmade cellulose; and
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,
(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.

US Pat. No. 10,640,928

ABSORBENT PAPER PRODUCTS HAVING UNIQUE PHYSICAL STRENGTH PROPERTIES

Mercer International Inc....

1. An absorbent towel paper product having a differential density, a machine direction, and a cross-machine direction orthogonal to the machine direction, wherein the absorbent towel paper product comprises two plies of absorbent towel paper webs, wherein each absorbent towel paper web comprises:(a) from about 20% to about 90% by weight of the dry fiber basis of the absorbent towel paper web of a refined soft wood pulp fiber mixture comprising:
i) from about 18.5% to about 88.5% by weight of the dry fiber basis of the absorbent towel paper web of soft wood pulp fiber;
wherein the soft wood pulp fiber is refined at a delivered energy of less than about 50.3 kWH/bdt before being added to the mixture;
ii) from about 0.25% to about 5.0% by weight of the dry fiber basis of the absorbent towel paper web of cationic strengthening polymer; and,
iii) from about 0.05% to about 20% by weight of the dry fiber basis of the absorbent towel paper web of cellulose nano-filaments;
(b) from about 10% to about 55% by weight of the dry fiber basis of the absorbent towel paper web of a hard wood pulp fiber mixture; and,
(c) not more than about 10% by weight moisture;
wherein the absorbent towel paper product has a Mean Square Dry Tensile Strength index ranging from about 10 N·m/g to about 18 N·m/g; and,
wherein the absorbent towel paper product has a Cross-directional Wet Tensile Strength to Cross-directional Dry Tensile Strength Ratio value ranging from about 0.295 to about 0.33.
US Pat. No. 10,682,021

SOFT SANITARY TISSUE PAPER WEB PRODUCTS COMPRISING NANO-FILAMENTS

Mercer International Inc....

11. A differential density soft sanitary tissue paper web comprising at least one ply, said differential density soft sanitary tissue paper web comprising:(a) from about 2% to about 56.5% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a softwood pulp fiber mixture, said softwood pulp fiber mixture comprising:
1) from about 0% to about 56.4% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a softwood pulp fiber; and,
2) at least about 0.05% to about 20% by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a blend of cellulose micro-filaments and cellulose nano-filaments, wherein said blend of cellulose micro-filaments and cellulose nano-filaments comprises:
A) at least about 50% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulose micro-filaments and cellulose nano-filaments;
B) at least about 10% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of intact fibrillated fibers; and
C) at least about 5% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulosic fines; and,
b) from about 0.05% to about 3.0% by weight of the by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of strengthening additive; and,
c) from about 43.5% to about 99.9% by weight of the by weight of the dry fiber basis of said differential density soft sanitary tissue paper web of a hardwood pulp fiber mixture.
US Pat. No. 10,687,675

ABSORBENT TOWEL PAPER WEB PRODUCTS COMPRISING NANO-FILAMENTS

Mercer International Inc....

11. A differential density absorbent towel paper web comprising at least one ply, said differential density absorbent towel paper web comprising:(a) from about 45% to about 90% by weight of the dry fiber basis of said differential density absorbent towel paper web of a softwood pulp fiber mixture, said softwood pulp fiber mixture comprising:
1) from about 20% to about 89.9% by weight of the dry fiber basis of said differential density absorbent towel paper web of softwood pulp fibers;
2) from about 0.05% to about 20% by weight of the dry fiber basis of said differential density absorbent towel paper web of a blend of cellulose micro-filaments and cellulose nano-filaments, said blend of cellulose micro-filaments and cellulose nano-filaments comprising:
A) at least about 40% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulose micro-filaments and cellulose nano-filaments;
B) at least about 10% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of intact fibrillated fibers; and
C) at least about 5% by weight of said blend of cellulose micro-filaments and cellulose nano-filaments of cellulosic fines; and,
b) from about 0.05% to about 5.0% by weight of the dry fiber basis of said differential density absorbent towel paper web of a strengthening additive; and,
c) from about 10% to about 55% by weight of the dry fiber basis of said differential density absorbent towel paper web of a hardwood pulp fiber mixture.

US Pat. No. 11,111,344

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

Mercer International Inc....


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.