High wet and dry strength paper product

Details High wet and dry strength paper product High wet and dry strength paper product

1998-12-10

2001-06-05

Fortuna, Jose (Department: 1731)

Paper making and fiber liberation

Processes and products

Plural fiber containing

C162S177000, C162S175000, C162S178000, C162S164300, C162S164600, C428S340000

Reexamination Certificate

active

06241853

ABSTRACT:

BACKGROUND OF THE INVENTION
In consumer and industrial paper products strength is an important feature. For example in consumer and industrial paper towels both wet and dry strength are important features to performance and user acceptance of a towel. Many chemical and fiber furnishes and processes have been used in attempts to obtain both increased wet and dry strength, while maintaining other factors and features in a favorable light, such as cost of material, production costs, product efficiency and feel of the product. Methods and products that have provided for a very well received soft and yet strong paper sheet are those directed to an uncreped through-air-dried sheet, such as those disclosed in U.S. Pat. Nos. 5,048,589; 5,399,412; 5,607,551; 5,616,207; 5,672,248; 5,746,887 and pending U.S. patent application Ser. No. 08/310,186 filed Sep. 21, 1994, all of which are assigned to Kimberly-Clark, and the disclosures of which are herein incorporated by reference.
SUMMARY OF THE INVENTION
In an embodiment of the present invention there is provided a strong soft absorbent paper product comprising: paper making fibers, an anionic processing aid, and a cationic wet strength resin; the product having a basis weight of from about 15 to about 80 grams/square meter; a GMT of at least about 2200; and a GM Modulus of less than about 11,000 g. This paper product may also comprise paper making fibers having a % RBA of from about 17 to about 22, a number of fibers per gram of from about 5 million to about 9 million, and a carboxyl content in meq/100 g of from about 1.5 to about 3.0. This paper product may be a paper towel and the paper making fibers may be fibers having a % RBA of at least about 17 and the anionic processing aid may be a carboxymethylcellulose. This paper product may be multilayered, or it may be blended. This paper product may further have a ratio of GM Modulus over GM Tensile (i.e., GM Modulus/GM Tensile) of less than about 12.
In another embodiment of the present invention there is provided a strong soft absorbent paper product comprising: paper making fibers having less than about 9 million fibers per gram; an anionic processing aid; and less than about 18 Kg./meteric ton of a cationic wet strength resin; the paper product having a basis weight of from about 30 to about 50 grams/square meter and a wet CD tensile of at least about 730 g. This paper product may also comprise paper making fibers having a % RBA of from about 17 to about 22, a number of fibers per gram of from about 5 million to about 9 million, and a carboxyl content in meq/100 g of from about 1.5 to about 3.0. This paper product may be a paper towel and the paper making fibers may further comprise paper making fibers having a % RBA of from at least about 17, and the anionic processing aid may be a carboxymethylcellulose. This paper product may be multilayered or it may be a single layer blended sheet.
In yet a further embodiment of the present invention there is provided a strong soft absorbent paper product comprising: paper making fibers selected from the group consisting of NB-88 pulp, Marathon pulp, and K-10s pulp; an anionic processing aid, and a cationic wet strength resin; the paper product having a GMT of at least about 2,200; and a basis weight of from about 25 to about 50 grams/square meter.
In another embodiment of the present invention there is provided a strong soft absorbent paper product comprising: paper making fibers, an anionic processing aid, and a cationic wet strength resin; the product having a basis weight of from about 15 to about 80 grams/square meter; a GMT of at least about 2200; and a GM Modulus of less than about 10,000 g. This paper product may also have a ratio of GM Modulus over GM Tensile of less than about 12.


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