D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
92/54, 8/82
D21B 1/00 (2006.01) D21B 1/16 (2006.01)
Patent
CA 1051246
ABSTRACT OF THE DISCLOSURE Method of producing mechanical pulp of improved brightness and light-scattering properties in a defibration apparatus in which wood chips or other cellulose-containing fibrous material are ground between a pair of discs which rotate relative to one another in a pressurized grinding zone. Prior to the defibrating process, the chips are impregnated with a solution of alkali selected from the group consisting of alkaline hydroxides, alkali silicate, al- kali carbonate and alkali bicarbonate admixed with a peroxide sol- ution at a temperature below 80°C. After removal of surplus im- pregnating solution by compression of the chips, the latter are in- troduced into a pressure vessel which is in communication with the grinding zone. Normally, the temperature in the grinding zone ex- ceeds 100°C, which has a degrading effect on the chemical compounds, particularly on the peroxide, in the impregnated chips, resulting in a pulp of impaired brightness and light-scattering properties. In order to conteract the effect of this high temperature, compress- ed air or other inert gas, such as steam, is introduced into the pressure vessel in an amount sufficient to maintain the chips in the pressure vessel at a temperature below 90°C and to maintain a predetermined pressure within the defibrating zone.
246370
Alf Societe Anonyme
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