D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
9/22
D21B 1/02 (2006.01) D21B 1/14 (2006.01) D21B 1/16 (2006.01)
Patent
CA 1272563
Abstract In accordance with the invention a chemimechanical pulp is produced from lignocellulosic material, for example wood chips, by subjecting the material to a process in which it is steamed, impregnated with alkali and peroxide, drained, pre-heated, refined and bleached. The material is impreg- nated in a single stage with a solution containing alkali and peroxide. Subsequent to passing an intermediate drain- age and reaction stage, the material is pre-heated to a temperature of from about 50°C, but not above 100°C. The material is then refined in one or two stages. The material can be impregnated by immersing the same in the impregnating solution for a period of up to 20 minutes at a temperature of 15-60°C, or by compressing the material in a screw press and permitting the compressed material to expand in the impregnating solution. The ratio of alkali to peroxide in the impregnating solution is balanced so as to obtain a pH greater than 12. The optimal brightness for a given peroxide charge is achieved by a balanced division of the peroxide charge between the chip impregnating stage and the bleaching stage.
504064
Agnemo Roland
Bengtsson Goran
Simonson Rune
Bengtsson Goran
Eka Ab
Kirby Eades Gale Baker
Simonson Rune
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