Method of producing bleached mechanical pulp

Details Method of producing bleached mechanical pulp Method of producing bleached mechanical pulp

1978-06-19

1980-02-05

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 26, 162 28, 162 56, 162 65, 162 78, 162 80, 162 86, 162 90, 241 18, 241 28, D21B 102, D21B 104, D21B 116

Patent

active

041871413

ABSTRACT:
Method of producing mechanical pulp of improved brightness and light-scattering properties in a defibration apparatus in which wood chips 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 sodium hydroxide, alkali silicate, alkali carbonate and alkali bicarbonate, and peroxide, surplus impregnating solution is removed from the chips by compression of the chips, the chips are introduced into a pressure vessel which is in communication with the grinding zone and compressed air is introduced into the pressure vessel in an amount sufficient to maintain the chips in the pressure vessel at a temperature below 90.degree. C. and to maintain superatmospheric pressure within the defibrating zone.

REFERENCES:
patent: 1987195 (1935-01-01), Kipper
patent: 2958622 (1960-11-01), Sparrow
patent: 3558428 (1971-01-01), Asplund et al.
patent: 3652385 (1972-03-01), Noreus et al.
patent: 3808090 (1974-04-01), Logan et al.
patent: 3811993 (1974-05-01), Ghisoni

Affiliated with

Also associated with

Rating

Method of producing bleached mechanical pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of producing bleached mechanical pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing bleached mechanical pulp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2179257