Dissolved air de-bonding of a tissue sheet
AssigneeGPCP IP Holdings LLC
InventorJeffrey A. Lee
Life of this patent
Estimating the term…
Abstract
Tissue papers and methods of making are disclosed herein. In one aspect, a tissue paper is substantially free of a chemical debonder and has a geometric mean tensile (GMT) in a range between about 500 and about 5,000 g/3 inches (g/3 in.) and a caliper in a range between about 50 and about 350 mils/8 sheets.
Claims25
A method of making a tissue paper having a geometric mean tensile (GMT) in a range between about 500 and about 5,000 g/3 in. and a caliper in a range between about 50 and about 350 mils/8 sheets, the method comprising:
- compressing a water-soluble gas with a compressor to form a compressed water-soluble gas;
- mixing an aqueous solution and a fiber slurry comprising cellulosic fibers under a super-atmospheric pressure in a contained environment in the presence of a compressed water-soluble gas to form a dilute dissolved gas-impregnated fiber slurry comprising dissolved gas-impregnated fibers;
- discharging the dilute dissolved gas-impregnated fiber slurry from the contained environment directly onto a foraminous support at a lower pressure to form a nascent web, the lower pressure being a pressure less than the super-atmospheric pressure;
- and
- drying the nascent web to expand, separate, or both expand and separate the dissolved gas-impregnated fibers to form the tissue paper;
- wherein the tissue paper comprises less than 4 pounds per ton of a chemical debonder.
A method of making a tissue paper having a geometric mean tensile (GMT) in a range between about 500 and about 2,500 g/3 in. and a caliper of at least about 50 mils/8 sheets, the method comprising:
- compressing a water-soluble gas with a compressor to form a compressed water-soluble gas;
- exposing an aqueous solution to the compressed water-soluble gas under a super-atmospheric pressure in a contained environment to form a dissolved gas-impregnated solution;
- mixing the dissolved gas-impregnated solution with a fiber slurry comprising cellulosic fibers in the contained environment to form a dilute dissolved gas-impregnated fiber slurry comprising dissolved dissolved gas-impregnated fibers;
- discharging the dilute dissolved gas-impregnated fiber slurry from the contained environment directly onto a foraminous support at atmospheric pressure to form a nascent web;
- and
- drying the nascent web to expand, separate, or both expand and separate the dissolved gas-impregnated fibers to form the tissue paper;
- wherein the tissue paper comprises less than 4 pounds per ton of a chemical debonder.
Dependencies are inferred from the claim text.