Pulp slurry-handling press roll and twin and single roll slurry

Details Pulp slurry-handling press roll and twin and single roll slurry Pulp slurry-handling press roll and twin and single roll slurry

1996-02-08

1997-09-16

Czaja, Donald E.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162357, 100121, 210404, D21F 260, B30B 924, B01D 3306

Patent

active

056676425

ABSTRACT:
A drum having a longitudinal axis, and an outer periphery, has a multiplicity of longitudinal, drainage grooves formed therein, and a cylindrical sheath encloses the drum, the sheath having a multiplicity of holes formed therein. The drum is imperforate. A pair of the drums is employed in a twin-roll press as press rolls, and one thereof is used in a single roll press with a compaction baffle. In one embodiment, the press roll has its grooves formed in a herringbone pattern, the same pointed in the direction of rotation, to enhance drainage. In another embodiment, the longitudinal drainage grooves have increasing depth, toward a mid-length of the press roll where they open into inner-drum drainage conduits which discharge the filtrate adjacent the rotary axis of the press roll.

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patent: 4906364 (1990-03-01), Luthi et al.
patent: 5046338 (1991-09-01), Luthi
patent: 5281343 (1994-01-01), Lewis et al.

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