| 摘要 |
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.
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