D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/13
D21F 9/04 (2006.01) D21C 9/10 (2006.01) D21D 1/40 (2006.01)
Patent
CA 1050317
ABSTRACT OF THE DISCLOSURE Fibrous material is treated in apparatus com- prising a fluid permeable drum rotatably mounted within a housing shaped to form with the drum a peripheral treatment path converging in the direction of rotation of the drum from an inlet portion successively to a web forming zone, a washing zone, a treatment zone, a com- pression zone and an outlet. A fibrous suspension of cellulosic material is supplied to the inlet portion and forms a high fibrous concentration web on the rotary drum in the web forming zone, suspension liquid being dis- charged through the permeable drum; a washing liquid is applied to the web in the washing zone and displaces sus- pension liquid in the web; at the end of the washing zone, the web is compressed in the nip between the drum and a roll to discharge washing liquid from the web through the drum; after compression, the web is allowed to expand in the treatment zone where it becomes impregnated with a treatment liquid under pressure; at the end of the treatment zone, the web is compressed in the nip between the drum and another roll to express treatment liquid therefrom through the drum; after compression, the web is removed from the drum, allowed to expand in the presence of a gaseous medium, and shredded.
255989
Malmstrom Per H.
Tell Lars E. K. A.
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