CTMP-process

Details CTMP-process CTMP-process

1994-11-07

1997-03-04

Knable, Geoffrey L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 26, 162 78, 162 83, D21B 102

Patent

active

056075464

ABSTRACT:
An absorbent, chemithermomechanical pulp produced from lignocellulosic material with a wood yield above 88%, a low resin content <0.15%, a long fiber content above 70%, a short fiber content below 10% and a shive content below 3%. The method for producing the pulp comprises the steps of impregnating, preheating, defibering, and washing the material. The impregnation and preheating of the chips are effected in one and the same vessel over a combined time period of at most 2 minutes, particularly at most 1 minute, preferably at most 0.5 minutes; using a warm impregnating liquid having a temperature of at least 100.degree. C., suitably at least 130.degree. C. and preferably having essentially the same temperature as in the preheating process; and preheating the chips at a temperature of 150.degree.-175.degree. C., preferably 160.degree.-170.degree. C. Defibering is carried out with an energy input which is at most half of the energy input required for defibering when the preheating and defibering are carried out at 135.degree. C.

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