A pulp slurry-handling press roll, and twin roll and single...

D - Textiles – Paper – 21 – F

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D21F 1/74 (2006.01)

Patent

CA 2198230

A drum (32) having a longitudinal axis, and an outer periphery, has a multiplicity of longitudinal, drainage grooves (16) formed therein, and a cylindrical sheath encloses the drum (32), the sheath having a multiplicity of holes (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 used in a single roll press with a compaction baffle. In one embodiment, the press roll (12, 14) has its grooves (16) formed in a herringbone pattern, the same pointed in the direction of rotation, to enhance drainage. In another embodiment, the longitudinal drainage grooves (16) have increasing depth, toward a mid-length of the press roll (12, 14) where they open into inner-drum drainage conduits which discharge the filtrate adjacent the rotaty axis of the press roll (12, 14).

Tambour (32) à axe longitudinal, dont la périphérie présente une série de rainures (16) longitudinales d'écoulement, le tambour étant entouré d'un gainage perforé d'une multitude de trous, le tambour étant lui-même exempt de perforations. Deux de ces tambours peuvent servir soit dans des presses bicylindres, un seul tambour étant utilisé dans des presses monocylindres à baffle de compactage. Dans l'une des variantes, les rainures (16) du tambour (12, 14) sont en arêtes de poisson pointées dans le sens de rotation. Dans une autre variante les rainures (16) d'écoulement présentent une profondeur accrue vers la mi-longueur du tambour (12, 14) où elles débouchent dans des conduits d'écoulement intérieurs au tambour qui amènent le filtrat à proximité de l'axe de rotation du tambour (12, 14).

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