A PULP SLURRY-HANDLING PRESS ROLL, AND TWIN ROLL AND SINGLE ROLL SLURRY-HANDLING PRESSES

摘要

A drum (32) having a longitudinal axis, and an outer periphery, has amultiplicity of longitudinal, drainage grooves (16) formed therein, and acylindrical sheath encloses the drum (32), the sheath having a multiplicity ofholes (38) formed therein. The drum (32) is imperforate. A pair of the drums(32) is employed in a twin-roll press as press rolls, and one thereof is usedin a single roll press with a compaction baffle. In one embodiment, the pressroll (12, 14) has its grooves (16) formed in a herringbone pattern, the samepointed in the direction of rotation, to enhance drainage. In anotherembodiment, the longitudinal drainage grooves (16) have increasing depth,toward a mid-length of the press roll (12, 14) where they open into inner-drumdrainage conduits which discharge the filtrate adjacent the rotaty axis of thepress roll (12, 14).