Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1987-08-05
1989-01-03
Fisher, Richard V.
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
291638, 162251, 209270, 209273, 209306, 209397, 210498, 210415, 21912167, B01D 3910
Patent
active
047955600
ABSTRACT:
A screen plate and plate and method of making a screen plate for the pressure screening of papermaking stock in pressure screening apparatus includes slots which have been cut therethrough by a machining laser beam focused at the inlet side of the plate, to provide slots with nearly straight walls with minimum taper, and which are recast and have a "glassy" appearance by reason of the melting and resolidification of the immediate wall surface, to provide a low friction path for the stock. Straight, curved and inclined or slanted slots are disclosed including slots which are at a diagonal to the axis of the cylinder. Slots or openings are disclosed which are inclined to a radius line therethrough both with and against the direction of flow of the stock along the inlet surface. Wear bars are applied to the plate for coaction with the rotating foils on the screening apparatus, in the form of strips of weld material of high hardness applied directly to the plate.
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"Microstructure and Its Effect on Toughness and Wear Resistance of Laser Surface Melted and Post Heated High Speed Steel", Metallurgical Transactions vol. 15A, 10/84 pp. 1829-1835 Leif Ahman.
Chupka David E.
Landegger Carl C.
Fisher Richard V.
Jones W. Gary
The Black Clawson Company
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