Creped tissue product with enhanced retention capacity
View Patent ↗An absorbent composite material may be manufactured by applying a flexible absorbent binder polymer (FAB), also referred to herein as a flexible superabsorbent, during the creping step of conventional tissue manufacturing. As such, the costly process of applying FAB to a substrate by spraying or printing followed by drying may be eliminated. The creping step has the additional advantage of improving the flexibility and softness of the FAB treated fibrous web.
1. A process for producing a creped sheet product comprising:
a. applying an additive composition comprising a flexible superabsorbent and a film forming component to a moving creping surface;
b. pressing a base sheet against the creping surface after the additive composition has been applied, the additive composition adhering the base sheet to the creping surface; and
c. removing the base sheet from the creping surface with a creping blade, wherein the base sheet comprises, by weight, from about 0.1% to about 3% additive composition.
2. The process of claim 1 , wherein the base sheet comprises a wet laid tissue web.
3. The process of claim 1 , wherein the base sheet comprises an air formed web.
4. The process of claim 1 , wherein the base web comprises a spunbond web or a meltblown web.
5. The process of claim 1 , wherein the base sheet comprises a hydroentangled web, the base sheet containing synthetic fibers and cellulosic fibers.
6. The process of claim 1 , wherein the base sheet comprise a co-formed web, the web containing synthetic fibers and cellulosic fibers.
7. The process of claim 1 , wherein the base sheet has a consistency of from about 10% to about 70% when pressed against the creping surface.
8. The process of claim 1 , wherein the base sheet contains moisture in an amount less than about 5% by weight when pressed against the creping surface.
9. The process of claim 1 , wherein the creping surface is heated to a temperature from about 120° C. to about 150° C.
10. The process of claim 1 , wherein the flexible superabsorbent comprises the reaction product of at least 15% by mass monoethylenically unsaturated monomer selected from carboxylic acid, carboxylic acid salts, sulphonic acid, sulphonic acid salts, phosphoric acid, and phosphoric acid salts; a plasticizer; an acrylate or methacrylate ester that contains an alkoxysilane functionality; a chain transfer agent; a transition metal salt; an initiator system; and a neutralizing agent.
11. The process of claim 1 , wherein the water-soluble film forming polymer is selected from the group consisting of cellulose ethers and esters, poly(acrylic acid) and salts thereof, poly(acrylate esters), and poly(acrylic acid) copolymers.
12. The process of claim 1 , wherein the creping additive further comprises a modifier component.