D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/43, 92/52
D21C 1/00 (2006.01)
Patent
CA 1064748
PROCESS OF MAKING PULP FROM LIGNO- CELLULOSE CONTAINING MATERIAL ABSTRACT OF THE DISCLOSURE Method of making high yield pulp for papermaking with re- duced energy consumption, in which the pulp material, such as wood chips and other lignocellulose-containing material, is first heat- ed in an environment of steam to a temperature exceeding 120°C and preferably higher than 140°C, under corresponding steam pres- sure, and then subjected to a first fiber separation step in a disc type defibrating apparatus under maintenance of substantially the same temperature and steam pressure. The thus defibrated pulp material is passed through an electron radiation apparatus under reduced pressure, where the initially separated fibers are sub- jected to irradiation with electrons to enhance the pulping pro- perties of the pulp material. Thereafter, the irradiated and in- itially defibrated pulp material is subjected to a second fiber separation step in a second defibrator, under lower temperature and pressure than in the first defibrating step, before it is dis- charged for further elective processing. The irradiation of the initially separated fibers should be in an amount sufficient to carry out the two defibrating steps at an energy consumption of less than 500 KWh per ton of pulp, and preferably between 100 KWh and 300 KWh.
285696
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