| 摘要 |
Fibrous material is treated in apparatus comprising 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 compression 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 discharged through the permeable drum; a washing liquid is applied to the web in the washing zone and displaces suspension 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. |
