Process for producing paper

Details Process for producing paper Process for producing paper

1996-01-19

1997-12-09

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621643, 1621646, 1621683, 162175, 1621811, 1621812, 1621813, 1621814, 1621815, 1621816, 162183, D21H 2110

Patent

active

056956096

ABSTRACT:
The invention relates to a process for the production of paper by adding to an aqueous fiber suspension, which possibly contains a filler, auxiliary agents for improving retention and/or dewatering, the auxiliary agents being a cationic long-chain polyacrylamide and an aluminum salt, and by dewatering the obtained fiber suspension during the sheet-forming stage. According to the invention, the said aqueous fiber suspension, possibly containing a filler, to which the cationic long-chain polyacrylamide has first been added, is subjected to shearing forces, whereafter there is added to it, directly before sheet forming, a polymeric aluminum salt or an aluminum salt, in which case a base or an acid is added, when necessary, to the said fiber suspension so that the pH be within the range 7-9 before the sheet forming, in which case aluminum hydroxy particles having anionic surface charges will be formed in situ.

REFERENCES:
patent: 4753710 (1988-06-01), Langley et al.
patent: 4911790 (1990-03-01), Lindstrom et al.
patent: 4980025 (1990-12-01), Andersson et al.

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