Papermaking process

Details Papermaking process Papermaking process

1991-09-27

1993-06-22

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621643, 1621646, 1621681, 1621682, 1621683, 162175, 1621811, 1621812, 1631813, 163183, D21H 2110

Patent

active

052214354

ABSTRACT:
In a papermaking process a paper product is formed from a mineral filler containing cellulosic slurry. Retention performance is provided by the sequential addition of a cationic charge-biasing species, an anionic flocculant, and then a certain microparticle. A shear stage is interposed between the flocculant addition and the microparticle addition. The microparticle is a inorganic, cationic source of aluminum.

REFERENCES:
patent: 3117944 (1964-01-01), Harrell
patent: 4388150 (1983-06-01), Sunden et al.
patent: 4643801 (1987-02-01), Johnson
patent: 4753710 (1988-06-01), Langley et al.
patent: 4874466 (1989-10-01), Savino
patent: 4913775 (1990-04-01), Langley et al.
Encyclopedia of Chemical Technology, Kirk and Othmer, vol. 16, pp. 744-785 and 788-791.
Encyclopedia of Chemical Technology, Kirk and Othmer, vol. 16, pp. 804-810.
"Silicates in Paper Products Improve Strength and Function Peformance", James S. Falcone et al., Pulp & Paper, Jan. 1976, pp. 93-96.
Literature Search on Retention/drainage Aids, dual systems, (search No. 3269), pp. 5-6, 19-22, 100-103, 136-139, 193-198, and 261-262.
Literature Search on Use of Colloidal Alumina As a Retention Aid, 3 pp.
Literature Search entitled Particles Used in Retention/drainage Programs, pp. R1 to R11, and Table 1.

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