Tissue products having reduced slough

Details Tissue products having reduced slough Tissue products having reduced slough

2002-10-08

2004-06-22

Fortuna, José A. (Department: 1731)

Paper making and fiber liberation

Processes and products

With coating after drying

C162S204000, C162S169000, C162S158000, C162S125000, C162S127000

Reexamination Certificate

active

06752905

ABSTRACT:

BACKGROUND OF THE INVENTION
Tissue products, such as facial tissues, paper towels, bath tissues, sanitary napkins, and other similar products, are designed to include several important properties. For example, the products should have good bulk, a soft feel, and should have good strength. Unfortunately, however, when steps are taken to increase one property of the product, other characteristics of the product are often adversely affected.
For example, during a papermaking process, it is common to use various resins to increase the wet strength of the web. Cationic resins, for example, are often used because they are believed to more readily bond to the anionically charged cellulosic fibers. In addition, resins that are anionic in nature have also been utilized. U.S. Pat. No. 3,844,880 to Meisel, Jr., et al., for instance, describes anionic styrene-butadiene latexes that are adhered to the anionic cellulosic fibers with a deposition aid. Although strength resins can increase the strength of the web, they also tend to stiffen the web, which is often undesired by consumers. Thus, various methods are often used to counteract this stiffness and to soften the product. For example, chemical debonders can be utilized to reduce fiber bonding and thereby increase softness.
Nevertheless, reducing fiber bonding with a chemical debonder can sometimes adversely affect the strength of the tissue product. For example, hydrogen bonds between adjacent fibers can be broken by such chemical debonders, as well as by mechanical forces of a papermaking process. Consequently, such debonding results in loosely bound fibers that extend from the surface of the tissue product. During processing and/or use, these loosely bound fibers create zones of fibers that are poorly bound to each other and adjacent zones of fibers. As a result, during use, certain shear forces can liberate the weakly bound zones from the remaining fibers, thereby resulting in slough, i.e., bundles or pills on surfaces, such as skin or fabric. Thus, the use of such debonders can sometimes result in a much weaker paper product during use that exhibits substantial amounts of slough.
As such, a need currently exists for a tissue product that is strong, soft, and that also has low slough.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, a method is provided for forming a tissue product. The method includes providing a liquid furnish of cellulosic fibers and forming a multi-layered wet web from the liquid furnish of cellulosic fibers. The wet web is dried to a solids consistency of about 90% or greater, such as with one or more through-dryers. At least one latex (e.g., nonionic or anionic) is applied to the dried web (e.g., foamed, printed, sprayed, etc.) in an amount less than about 3% of the dry weight of said web, in some embodiments, from about 0.1% to about 1.5% of the dry weight of the web, and in some embodiments, from about 0.5% to about 1% of the dry weight of the web. The latex remains substantially uncured after being applied to the dried web. For instance, in some embodiments, the dried web remains at a temperature below about 130° C. after being applied with the latex. The latex has a glass transition temperature that is less than about 30° C., and in some embodiments, that is also greater than about −25° C. For example, in some embodiments, the glass transition temperature is from about −15° C. to about 15° C., and in some embodiments, from about −10° C. to about 0° C. The latex can be selected from the group consisting of styrene-butadiene copolymers, polyvinyl acetate homopolymers, vinyl-acetate ethylene copolymers, vinyl-acetate acrylic copolymers, ethylene-vinyl chloride copolymers, ethylene-vinyl chloride-vinyl acetate terpolymers, acrylic polyvinyl chloride polymers, acrylic polymers, and nitrile polymers.
In some embodiments, the surface of the multi-layered dried web has elevated regions and non-elevated regions. The latex may be applied to the dried web such that a greater amount of the latex resides on the elevated regions than on the non-elevated regions. Generally, the latex may be applied to the web in a variety of ways. For instance, the latex may be applied to the web as a foam composition. The foam composition may have a blow ratio greater than about 3:1 before being applied to the dried web. Alternatively, the latex may be applied by printing, spraying, as well as other techniques.
In accordance with another embodiment of the present invention, a tissue product is disclosed that comprises a multi-layered paper web having at least one outer layer that defines an outer surface of the tissue product. The outer layer comprises a substantially uncured latex having a glass transition temperature less than about 30° C. and greater than about −25° C. If desired, one or more of the remaining layers of the multi-layered paper web may remain substantially free of the latex.
Other features and aspects of the present invention are discussed in greater detail below.


REFERENCES:
patent: 2345543 (1944-03-01), Wohnsiedler et al.
patent: 2745744 (1956-05-01), Weidner et al.
patent: 2926116 (1960-02-01), Keim
patent: 2926154 (1960-03-01), Keim
patent: 3556932 (1971-01-01), Coscia et al.
patent: 3556933 (1971-01-01), Williams et al.
patent: 3700623 (1972-10-01), Keim
patent: 3772076 (1973-11-01), Keim
patent: 3812000 (1974-05-01), Salvucci, Jr. et al.
patent: 3821068 (1974-06-01), Shaw
patent: 3844880 (1974-10-01), Meisel, Jr. et al.
patent: 3862877 (1975-01-01), Camden
patent: 3879257 (1975-04-01), Gentile et al.
patent: 3885158 (1975-05-01), Flutie et al.
patent: 3899388 (1975-08-01), Petrovich et al.
patent: 3903342 (1975-09-01), Roberts, Jr.
patent: 3994771 (1976-11-01), Morgan et al.
patent: 4018647 (1977-04-01), Wietsma
patent: 4057669 (1977-11-01), McConnell
patent: 4081318 (1978-03-01), Wietsma
patent: 4099913 (1978-07-01), Walter et al.
patent: 4121966 (1978-10-01), Amano et al.
patent: 4125659 (1978-11-01), Klowak et al.
patent: 4129528 (1978-12-01), Petrovich et al.
patent: 4147586 (1979-04-01), Petrovich et al.
patent: 4158594 (1979-06-01), Becker et al.
patent: 4208459 (1980-06-01), Becker et al.
patent: 4222921 (1980-09-01), Van Eenam
patent: 4237818 (1980-12-01), Clifford et al.
patent: 4326000 (1982-04-01), Roberts, Jr.
patent: 4351699 (1982-09-01), Osborn, III
patent: 4441962 (1984-04-01), Osborn, III
patent: 4447294 (1984-05-01), Osborn, III
patent: 4507173 (1985-03-01), Klowak et al.
patent: 4510019 (1985-04-01), Bartelloni
patent: 4581254 (1986-04-01), Cunningham et al.
patent: 4603176 (1986-07-01), Bjorkquist et al.
patent: 4604313 (1986-08-01), McFarland et al.
patent: 4605702 (1986-08-01), Guerro et al.
patent: 4795668 (1989-01-01), Krueger et al.
patent: 4822452 (1989-04-01), Tse et al.
patent: 4849054 (1989-07-01), Klowak
patent: 4925528 (1990-05-01), Tse et al.
patent: 4940513 (1990-07-01), Spendel
patent: 4959125 (1990-09-01), Spendel
patent: 5019211 (1991-05-01), Sauer
patent: 5048589 (1991-09-01), Cook et al.
patent: 5057368 (1991-10-01), Largman et al.
patent: 5069970 (1991-12-01), Largman et al.
patent: 5094717 (1992-03-01), Manning et al.
patent: 5102501 (1992-04-01), Eber et al.
patent: 5108820 (1992-04-01), Kaneko et al.
patent: 5129988 (1992-07-01), Farrington, Jr.
patent: 5162074 (1992-11-01), Hills
patent: 5164046 (1992-11-01), Ampulski et al.
patent: 5167765 (1992-12-01), Nielsen et al.
patent: 5238534 (1993-08-01), Manning et al.
patent: 5240562 (1993-08-01), Phan et al.
patent: 5277976 (1994-01-01), Hogle et al.
patent: 5336552 (1994-08-01), Strack et al.
patent: 5382400 (1995-01-01), Pike et al.
patent: 5385643 (1995-01-01), Ampulski
patent: 5397435 (1995-03-01), Ostendorf et al.
patent: 5399412 (1995-03-01), Sudall et al.
patent: 5405501 (1995-04-01), Phan et al.
patent: 5427696 (1995-06-01), Phan et al.
patent: 5437766 (1995-08-01), Van Phan et al.
patent: 5466337 (1995-11-01), Darlington et al.
patent: 5466410 (1995-11-01), Hills
patent: 5494554 (1996-02-01), Edwards et al.
patent: 5510000 (1996-04-01), Phan et al.
patent:

Affiliated with

Also associated with

Rating

Tissue products having reduced slough does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tissue products having reduced slough, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tissue products having reduced slough will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3361206