Method of treatment of waste paper with steam

Details Method of treatment of waste paper with steam Method of treatment of waste paper with steam

1990-12-10

1992-06-16

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 5, 162 21, 162 63, D21C 502

Patent

active

051222280

ABSTRACT:
Method is disclosed of treatment of waste paper or the like at high temperatures in the range of 160.degree. C. to about 230.degree. C. The furnish is treated in a digester with or without added chemicals but in the presence of saturated steam. The preferred dwell times are in the range of about 1 minute to about 6 minutes. The treated furnish is then discharged from the digester, preferably, but not exclusively, by an explosive discharge.
The advance in the art is in an improved de-inking effect, reduced consumption of chemicals and power. Also, some furnishes previously unsuitable for re-cycling, have been successfully processed by the method of the invention.

REFERENCES:
patent: 4163687 (1979-08-01), Mamers et al.
patent: 4235707 (1980-11-01), Burke, Jr.
patent: 4540467 (1985-09-01), Grube et al.
Mamers, "The Siropulper--A New Concept in Wastepaper Recovery", APPITA, vol. 32, No. 2, 1978.

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