Digester for cooking pulp having staggered circular screens for

Details Digester for cooking pulp having staggered circular screens for Digester for cooking pulp having staggered circular screens for

1995-03-31

1996-10-22

Czaja, Donald E.

Paper making and fiber liberation

Apparatus

Digester

162248, 162251, D21C 714

Patent

active

055672809

ABSTRACT:
A screen system for a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical vessel, where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digester screening arrangement (1D) between the top and the bottom of the digester, and fibre material is fed out from the bottom (1C) of the digester, wherein at least one of said screening arrangements (1, 2) has at least one screen element (2A) of which the main configuration is circular and which is assembled by means of welding, and which is fitted into the digester shell by means of welding.

REFERENCES:
patent: 2414062 (1947-01-01), Richter
patent: 2998064 (1957-12-01), Lang
patent: 3836463 (1972-07-01), Teague et al.
patent: 4630138 (1986-12-01), Utsugi et al.
Backlund, A. E., "Extended Delig., in a Cont. Digester", Nov. 1984, Tappi Journal, pp. 62-65.

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