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US 4,901,417 AGranted
Method of finishing screen plates
AssigneeThe Black Clawson Company
InventorsDavid E. Chupka, Carl C. Landegger
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AssigneeThe Black Clawson Company
InventorsDavid E. Chupka, Carl C. Landegger
Estimating the term…
A screen 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.
The method of finishing a metal screen plate for use in the pressure screening of papermaking stock for removing contaminant particles therefrom in pressure screening apparatus, in which the screen plate has a substantially cylindrical body of metal material of generally uniform thickness throughout said body having a radially outer outlet surface and a radially inner inlet surface, and in which the finished plate has a plurality of openings leading from said inner inlet surface to said outer outlet surface, comprising the steps of:
Dependencies are inferred from the claim text.