Pulp slurry-handling press roll and twin and single roll slurry handling presses
AssigneeBeloit Technologies, Inc.
InventorOscar Luthi
Life of this patent
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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.
Claims11
A twin roll, slurry-handling press, comprising:
- a housing;
- and
- a pair of coacting press rolls journalled in said housing;
- wherein
- said housing has means for admitting pulp slurry to said press rolls;
- and further including doctor means for extracting a pulp mat from said rolls;
- and wherein
- each of said rolls comprises a drum having a longitudinal axis, an outer periphery, and a multiplicity of longitudinally extending grooves formed therein about said periphery;
- and
- each of said rolls further comprises a cylindrical sheath which encloses said drum therewithin, wherein said cylindrical sheath seals off each one of said grooves from the other of said grooves thereof.
A single roll, slurry-handling press, comprising:
- a housing;
- a press roll journalled in said housing, wherein said housing has means for admitting pulp slurry to said roll, and doctor means for extracting a pulp mat from said roll;
- and
- means for compacting the pulp mat on said roll circumjacent said roll;
- and wherein said roll comprises an imperforate drum having a longitudinal axis, an outer periphery, and a multiplicity of longitudinally extending grooves formed therein about said periphery, and wherein said roll further comprises means overlying said grooves for filtering liquid therethrough;
- said filtering means comprises a cylindrical sheath which is substantially concentric with said imperforate drum and which encloses said imperforate drum therewithin;
- said sheath comprises means for sealing off each one of said grooves from the other of said grooves thereof.
Dependencies are inferred from the claim text.