Papermaking process

Details Papermaking process Papermaking process

1995-09-22

1997-01-21

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621645, 1621682, 1621683, 162183, D21H 2106

Patent

active

055956297

ABSTRACT:
A papermaking process comprising forming an aqueous cellulosic papermaking slurry and adding a cationic polymer and an anionic polymer to the slurry to increase retention and/or drainage is disclosed. The anionic polymer comprises a formaldehyde condensate of a naphthalene sulfonic acid salt (NSF) with a molecular weight range of 500 to 120,000, while the cationic polymer has a molecular weight range of from 500,000 to 20 million. After addition of the polymers, the slurry is drained to form a sheet, and the sheet is dried.

REFERENCES:
patent: 4070236 (1978-01-01), Carrard et al.
patent: 4388150 (1983-06-01), Sunden et al.
patent: 4753710 (1988-06-01), Langley et al.
patent: 4913775 (1990-04-01), Langley et al.
patent: 5098520 (1992-03-01), Begala
patent: 5338406 (1994-08-01), Smith
patent: 5368694 (1994-11-01), Rohlf et al.

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