US 9,309,627 B2 · High softness, high durability bath tissues with temporary wet strength

Abstract

A multi-ply bath tissue having no more than three plies and no fewer than two plies. The multi-ply tissue has a basis weight of from about 20 to about 35 lbs per 3000 sq foot ream and includes from about 3% to about 50% cellulosic microfiber, from about 50% to about 97% wood pulp fibers, has a geometric mean (GM) dry tensile of from about 17 to 80 g/3 in. per pound of basis weight, a cross-machine direction (CD) dry tensile of between about 30 to about 60 g/3 in. per pound of basis weight, and sufficient temporary wet strength resin to provide an initial Finch Cup CD wet tensile of from about 2.5 to about 20 g/3 in. per pound of basis weight. The initial Finch Cup CD wet tensile decays to less than 65% of the initial value in less than fifteen minutes after immersion in water. The product has a caliper of at least 5 mils per 8 sheets per pound of basis weight.

Claims109

Dependent claims

A multi-ply bath tissue having no more than three plies and no fewer than two plies, the multi-ply tissue having a basis weight of from about 20 to about 35 lbs per 3000 sq foot ream and comprising:

(A) from about 3% to about 50% cellulosic microfiber;
and
(B) from about 50% to about 97% wood pulp fibers,
the multi-ply bath tissue having:
(a) a GM dry tensile of from about 17 to 80 g/3 in. per pound of basis weight;
(b) a cross machine direction (CD) dry tensile of between about 30 to about 60 g/3 in. per pound of basis weight;
(c) sufficient temporary wet strength resin to provide an initial Finch Cup CD wet tensile of from about 2.5 to about 20 g/3 in. per pound of basis weight, the initial Finch Cup CD wet tensile decaying to less than 65% of the initial value in less than 15 minutes after immersion in water;
and
(d) a caliper of at least 5 mils per 8 sheets per pound of basis weight,
wherein at least one of the plies comprises:
(i) a plurality of fiber-enriched hollow domed regions having a relatively high basis weight;
(ii) a plurality of connecting regions having a relatively lower basis weight forming a network interconnecting the fiber-enriched hollow domed regions of the sheet;
and
(iii) a plurality of transition regions with upwardly and inwardly inflected consolidated fibrous regions transitioning from the connecting regions into the fiber-enriched hollow domed regions.

11 more elements

A three-ply bath tissue sheet having a basis weight of from about 20 to 38 lbs per 3000 sq foot ream, and comprising:

(A) from about 15% to about 25% cellulosic microfiber;
(B) from about 78% to about 85% wood pulp fibers;
and
(C) from about 10% to about 50% of the weight of the tissue comprising high lignin eucalyptus fibers having a lignin content of at least about 20%, an ISO brightness of at least about 84, a Canadian Standard Freeness (CSF) freeness of at least about 400 ml, a bulk of between 2.2 and 4.2 cc/g, and a breaking length of between about 1.2 and 4.7 km,
the three-ply bath tissue sheet having:
(a) a GM dry tensile of from about 25 to 80 g/3 in. per pound of basis weight;
(b) a breaking modulus of between 2.5 and 3.5 g/% stretch per pound of basis weight;
(c) a cross-machine (CD) dry tensile of between about 30 to about 60 g/3 in. per pound of basis weight;
(d) sufficient temporary wet strength resin to provide an initial Finch Cup CD wet tensile of from about 2.5 g/3 in. to about 20 g/3 in. per pound of basis weight, the initial Finch Cup CD wet tensile decaying to less than 65% of the initial value in less than one hour after immersion in water;
and
(e) an opacity of at least about 2.5 MacBeth Opacity Units per pound of basis weight,
wherein at least one of the plies, other than an interior ply, comprises:
(i) a plurality of fiber-enriched hollow domed regions having a relatively high basis weight;
(ii) a plurality of connecting regions having a relatively lower basis weight forming a network interconnecting the fiber-enriched hollow domed regions of the sheet;
and
(iii) a plurality of transition regions with upwardly and inwardly inflected consolidated fibrous saddle shaped regions transitioning from the connecting regions into the fiber-enriched hollow domed regions.

13 more elements

A three-ply bath tissue product having:

(A) an upper stratified ply comprising two strata, an outer stratum and an inner stratum,
(a) the outer stratum comprising a blend of at least about 30% to about 70% kraft fiber and at least 30% to about 70% by weight of eucalyptus kraft and having a basis weight of at least about 5 to about 12 lbs per 3000 sq ft ream;
and
(b) the inner stratum comprising at least about 50% eucalyptus fibers having a lignin content of at least about 20% by weight and a basis weight of at least about 2.0 lbs per 3000 sq ft ream;
(B) an interior ply having a basis weight of at least about 6 to about 15 lbs per 3000 sq ft ream, comprising:
(a) at least about 30% to about 70% eucalyptus fibers having a lignin content of at least about 20% by weight;
and
(b) from at least about 30% to about 70% by weight of bleached softwood kraft fibers;
and
(C) a lower stratified ply comprising two strata, a first stratum and a second stratum,
(a) the first stratum comprising from at least about 30% to about 70% kraft fiber and from about 30% to about 70% by weight of eucalyptus kraft and having a basis weight of about 5 to about 12 lbs per 3000 sq ft ream;
and
(b) the second stratum comprising at least about 50% eucalyptus fibers having a lignin content of at least about 20% by weight and a basis weight of at least about 2.0 lbs per 3000 sq ft ream,
wherein at least one of the plies comprises:
(i) a plurality of fiber-enriched hollow domed regions having a relatively high basis weight;
(ii) a plurality of connecting regions having a relatively lower basis weight forming a network interconnecting the fiber-enriched hollow domed regions of the sheet;
and
(iii) a plurality of transition regions with upwardly and inwardly inflected consolidated fibrous saddle shaped regions transitioning from the connecting regions into the fiber-enriched hollow domed regions.

15 more elements

A three-ply bath tissue product having:

(A) an upper stratified ply comprising two strata, an outer stratum and an inner stratum,
(a) the outer stratum comprising a blend of at least about 30% to about 70% kraft fiber and at least 30% to about 70% by weight of eucalyptus kraft and at least about 5% by weight of individualized regenerated cellulosic microfiber having a number average diameter of at most about 4 microns and a number average length of between about 50 microns and 2000 microns, the outer stratum having a basis weight of at least about 5 to about 12 lbs per 3000 sq ft ream;
and
(b) the inner stratum comprising at least about 70% eucalyptus fibers having a lignin content of at least about 20% by weight, and a basis weight of at least about 2.0 lbs per 3000 sq ft ream;
(B) an interior ply having a basis weight of at least about 6 to about 15 lbs per 3000 sq ft ream, comprising:
(a) at least about 40% to about 90% eucalyptus fibers having a lignin content of at least about 20% by weight;
and
(b) from at least about 10% to about 60% by weight of bleached kraft fiber;
and
(C) a lower stratified ply comprising at least two strata, including a first stratum and a second stratum,
(a) the first stratum comprising from at least about 30% to about 70% kraft fiber and from about 30% to about 70% by weight of eucalyptus kraft and having a basis weight of about 5 to about 12 lbs per 3000 sq ft ream;
and
(b) the second stratum comprising at least about 70% eucalyptus fibers having a lignin content of at least about 20% by weight and a basis weight of at least about 2.0 lbs per 3000 sq ft ream,
wherein at least one of the plies, other than an interior ply, comprises:
(i) a plurality of fiber-enriched hollow domed regions having a relatively high basis weight;
(ii) a plurality of connecting regions having a relatively lower basis weight forming a network interconnecting the fiber-enriched hollow domed regions of the sheet;
and
(iii) a plurality of transition regions with upwardly and inwardly inflected consolidated fibrous saddle shaped regions transitioning from the connecting regions into the fiber-enriched hollow domed regions.

15 more elements

Dependencies are inferred from the claim text.

High softness, high durability bath tissues with temporary wet strength

Life of this patent

High softness, high durability bath tissues with temporary wet strength

Life of this patent

Abstract

Claims109