Use of surfactant to increase water removal from fibrous web

Details Use of surfactant to increase water removal from fibrous web Use of surfactant to increase water removal from fibrous web

1976-10-26

1977-12-13

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Pore forming in situ

162145, 162152, 162175, 162184, D21D 300

Patent

active

040627217

ABSTRACT:
A surfactant foaming agent added to a wet fibrous sheet just before initiation of vacuum water extraction forms foam within the sheet. The foam expels water from the sheet while increasing the resistance to vacuum. Water removal time is lengthened and the fractional amount of water removed by suction is increased. The reduced residual water provides a proportional decrease in drying time and drying energy.
The addition of an anti-foaming agent with the surfactant reduces the water drainage time as compared to the normal case. This increases the drainage rate but does not increase the amount of water drained from the sheet.

REFERENCES:
patent: 2054630 (1936-09-01), Hurrey
patent: 3300372 (1967-01-01), Baur
patent: 3510394 (1970-05-01), Cadotte
patent: 3542640 (1970-11-01), Friedberg et al.
patent: 3716449 (1973-02-01), Gatward et al.
MacDonald, "Control, Sec. Fiber, Structural Board, Coating", vol. II (1969), pp. 429, 430.

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