Method in connection with the production of mechanical pulp

Details Method in connection with the production of mechanical pulp Method in connection with the production of mechanical pulp

2006-02-28

2006-02-28

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With plural or specified mechanical defibering step

C162S055000, C162S057000, C162S078000, C162S020000, C162S024000, C162S025000, C162S026000, C162S047000

Reexamination Certificate

active

07005034

ABSTRACT:
A method in connection with the production of mechanical pulp from a cellulose containing material wherein the material is processed in at least one refining step to produce pulp. According to the invention, the pulp is fractionated (4), after a first refining step (1), in order to separate primary fines (5) from the pulp. The invention also relates to a mechanical pulp, produced by the method, and to a paperboard, which at least partly consists of such mechanical pulp.

REFERENCES:
patent: 3411720 (1968-11-01), Jones et al.
patent: 3441130 (1969-04-01), Sisson et al.
patent: 4292122 (1981-09-01), Karnis et al.
patent: 4731160 (1988-03-01), Prough et al.
patent: 4776926 (1988-10-01), Lindahl
patent: 5118389 (1992-06-01), Dubelsten et al.
patent: 5853534 (1998-12-01), Hoglund et al.

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