Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1994-08-22
1996-05-21
Hastings, Karen M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 5, 162 55, 241 28, D21C 502, D21B 132
Patent
active
055185800
ABSTRACT:
The present invention relates to a method of processing printed waste paper, in particular waste paper containing at least 80% newsprint or magazine paper by digestion, various cleaning steps, flotation or washing and disintegrating, the latter with a high consistency of at least 20%, and possibly bleaching. The invention is characterized by the fact that a final second disintegrating step, arranged possibly before a bleaching step, with treatment of the waste paper under strong kneading action of individual bar-shaped or block-shaped kneading elements of both the stator and the rotor of the disintegrating machine which are arranged in a kneading chamber thereof which is delimited by two concentric cylindrical surfaces, at temperatures between 20.degree. and 110.degree. C., and preferably 38.degree. to 65.degree. C., and with a specific power consumption of between 30 and 100, and preferably 80, kilowatt hours/ton oven-dried pulp.
REFERENCES:
patent: 3891497 (1975-06-01), Daane et al.
patent: 4334984 (1982-06-01), Vagac et al.
patent: 4780179 (1988-10-01), Clement
patent: 4999084 (1991-03-01), Lang et al.
Das Papier; J. Bruckner "dispergierung"; vol. 42, No. 10, Oct. 1988, pp. 547-550.
Dorflinger Hans-Dieter
Ortner Herbert
Hastings Karen M.
J.M. Voith & GmbH
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