Process and equipment for pretreatment of cellulosic...

Details Process and equipment for pretreatment of cellulosic... Process and equipment for pretreatment of cellulosic...

D - Textiles, Paper

21

C

9/2, 92/52

D21C 1/10 (2006.01)

Patent

CA 1322827

ABSTRACT OF THE DISCLOSURE: The invention concerns a process and an equipment for pretreatment of cellulosic chip-formed raw-material by impregnation. In the process, first a vacuum treatment is carried out withou preceeding moistening treatment, and as soon as possible after the vacuum treatment penetration, is carried out with a solution of chemicals or with water at the atmospheric or a higher solution pressure. In this way the fiber cavities can be filled optimally, which promotes a uniform and adequate diffusion of the solution into the fiber walls significantly. The process can be carried out, e.g., in a device which comprises a tank for the treatment of the raw-material and therein a feed opening for the solution as well as an opening for removal of the raw- material, which opening communicates preferably with a reception tank, where the atmospheric or a higher pressure prevails.

590344

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