Process for producing paper

Details Process for producing paper Process for producing paper

D - Textiles, Paper

21

H

D21H 21/10 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/55 (2006.01) D21H 17/56 (2006.01) D21H 17/66 (2006.01) D21H 23/14 (2006.01) D21H 17/74 (1990.01)

Patent

CA 2127992

2127992 9314263 PCTABS00024 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.

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