Glue-bonded multi-ply absorbent sheet and polyvinyl alcohol ply bonding adhesive
AssigneeGPCP IP Holdings LLC
InventorsDaniel W. Sumnicht, Zhiying Yu, Siddharth S. Vaijapurkar
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Abstract
A multi-ply absorbent sheet includes a first absorbent ply of cellulosic sheet; a second absorbent ply of cellulosic sheet; and a ply bonding adhesive interposed between the first absorbent ply and the second absorbent ply, the ply-bonding adhesive thereby adhering said absorbent plies together. The ply-bonding adhesive comprises polyvinyl alcohol and nanofibrillated cellulose. In a particularly preferred embodiment the adhesive is applied as a dilute aqueous composition to tissue plies and the nanofibrillated cellulose has a Characteristic Breaking Length of 6.5 km or above.
Claims20
A method of making absorbent sheet comprising:
- (a) providing a first absorbent cellulosic basesheet;
- (b) providing a second absorbent cellulosic basesheet;
- (c) interposing an aqueous adhesive containing polyvinyl alcohol and nanofibrillated cellulose between said first and second cellulosic basesheets;
- and
- (d) plying said first absorbent cellulosic basesheet with said second absorbent cellulosic basesheet by pressing said absorbent cellulosic basesheets together.
A ply bonding adhesive for the manufacture of multi-ply paper tissue and multi-ply paper towel comprising:
- (a) water in an amount of from 90-98.5% by weight of the adhesive composition;
- (b) polyvinyl alcohol in an amount of from 1.5% to 10% by weight based on the weight of the adhesive composition;
- and
- (c) from 1% to 50% by weight of nanofibrillated cellulose based on the weight of polyvinyl alcohol in the adhesive composition.
Dependencies are inferred from the claim text.