High uniformity foam forming

Details High uniformity foam forming High uniformity foam forming

1992-01-24

1993-04-06

Chin, Peter

Paper making and fiber liberation

Processes and products

Pore forming in situ

162111, 162198, 162DIG11, D21H 2302

Patent

active

052000354

ABSTRACT:
A method of foam forming of paper includes the steps of metering a controlled feed of fiber dispersed in an aqueous liquid into a dewatering device, wherein the consistency of the fiber dispersed in the aqueous liquid input to the dewatering device is between about 0.5 and about 7% by weight. A uniform continuous strand of semi-moist pulp is obtained wherein the consistency of the semi-moist pulp leaving the dewatering device is between about 8 and 30% by weight. A stream of a foamed aqueous admixture is obtained and introduced into a dispersing mixer having shearing action extending substantially throughout a zone substantially athwart the flow path of the uniform continuous strand and the foamed aqueous stream and forming a stream of dispersed fiber bearing aqueous foam. The dispersed fiber bearing aqueous stream is conducted to the inlet of a positive displacement pump. Thereafter the dispersed fiber bearing stream is conducted through a headbox and the fibers dispersed in the stream are deposited on a moving foraminous support.

REFERENCES:
patent: 3716449 (1973-02-01), Gatward et al.
patent: 3871952 (1975-03-01), Robertson
patent: 3938782 (1976-02-01), Robertson
patent: 4488932 (1984-12-01), Eber et al.
patent: 4686006 (1987-08-01), Cheshire et al.
patent: 4764253 (1988-08-01), Cheshire et al.

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