Soft tissue having temporary wet strength
First Claim
1. A soft low density paper product with temporary wet strength, said paper product having a density, a basis weight, a wet burst strength, an initial wet strength, a thirty minute wet strength, and a dry strength, said paper product comprising:
- papermaking fibers wherein said papermaking fibers comprise between about 13% and about 25% softwood fibers; and
a chemical strength additive consisting essentially of a temporary wet strength resin;
wherein said density is less than about 0.6 grams per cubic centimeter, said basis weight is between about 10 and about 65 grams per square meter, said dry strength is less than about 500 grams per inch (197 grams per centimeter), said wet burst strength is at least about 35 grams, the ratio of said initial wet strength to said dry strength is greater than about 0.15;
1, and the ratio of said thirty minute wet strength to said initial wet strength is less than about 0.4.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a soft, low density paper product made using papermaking fibers and a cationic temporary wet strength resin. Such paper products have a density less than about 0.6 grams per cubic centimeter, a basis weight is between about 10 and about 65 grams per square meter, a dry strength less than about 500 grams per inch (197 grams per centimeter), a ratio of an initial wet strength to the dry strength greater than about 0.15:1, and a ratio of a thirty minute wet strength to the initial wet strength less than about 0.4. Methods for producing such paper products are also disclosed. The paper products may be produced either as homogeneous structures or as multi-layered structures and may be either creped or uncreped.
162 Citations
33 Claims
-
1. A soft low density paper product with temporary wet strength, said paper product having a density, a basis weight, a wet burst strength, an initial wet strength, a thirty minute wet strength, and a dry strength, said paper product comprising:
-
papermaking fibers wherein said papermaking fibers comprise between about 13% and about 25% softwood fibers; and a chemical strength additive consisting essentially of a temporary wet strength resin; wherein said density is less than about 0.6 grams per cubic centimeter, said basis weight is between about 10 and about 65 grams per square meter, said dry strength is less than about 500 grams per inch (197 grams per centimeter), said wet burst strength is at least about 35 grams, the ratio of said initial wet strength to said dry strength is greater than about 0.15;
1, and the ratio of said thirty minute wet strength to said initial wet strength is less than about 0.4. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
- 7. A soft low density paper product according to claim I wherein said ratio of said thirty minute wet strength to said initial wet strength is less than about 0.4:
-
23. A soft low density paper product with temporary wet strength, said paper product having a density less than about 0.6 grams per cubic centimeter, a basis weight between about 10 and about 65 grams per square meter, an initial wet strength, a thirty minute wet strength, a dry strength less than about 500 grams per inch (197 grams per centimeter), a wet burst strength between about 35 grams and about 70 grams, wherein the ratio of said initial wet strength to said dry strength is greater than about 0.15:
- 1, and the ratio of said thirty minute wet strength to said initial wet strength is less than about 0.4, said paper product comprising;
two outer layers comprising short papermaking fibers and a temporary wet strength resin; and an inner layer positioned between said outer layers, said inner layer comprising softwood long papermaking fibers and a temporary wet strength resin; wherein said softwood papermaking fibers comprise between about 13% and about 25% of the total combined weight of said short papermaking fibers and said softwood papermaking fibers and the level of said temporary wet strength resin in said outer layers is between about 0.1% and about 0.2% of the combined weight of said short papermaking fibers and said softwood papermaking fibers and the level of said temporary wet strength resin in said inner layer is between about 0.2% and about 0.4% of the combined weight of said short papermaking fibers and said softwood papermaking fibers. - View Dependent Claims (24)
- 1, and the ratio of said thirty minute wet strength to said initial wet strength is less than about 0.4, said paper product comprising;
Specification