Wear screen plate and method of manufacture thereof
AssigneeBeloit Corporation
InventorsWilliam A. Gero, Frank J. Paskowski, Jr.
Life of this patent
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Abstract
An improved screen plate for a pressure screening apparatus and a method for making the basket are disclosed wherein prestressed areas are provided at each end of each slot formed in the screen plate for minimizing crack propagation.
Claims19
A screen plate for use in paper pulp pressure screening apparatus, comprising in combination:
- a screen formed of a relatively thin sheet-like material of substantially uniform thickness therethrough, said material being formed into an undulating shape and having screening openings formed therethrough, and said formed sheet material being shaped as a cylinder;
- said screening openings being elongated slots formed in the material;
- and
- coined areas formed at each end of each slot, each coined area comprising a limited region in which the material is prestressed for minimizing crack formation and propagation.
In a screen plate assembly for use in a pressure screening apparatus, wherein a screen plate section is formed of relatively thin sheet-like material shaped into an undulating pattern and elongated slots are provided in the relatively thin material for the passage of slurry therethrough, the improvement comprising:
- discrete coined areas provided at each end of each slot, with the slot ends being located within the coined area for minimizing crack formation and propagation.
In a method for making a screen plate for a pressurized pulp screen apparatus wherein relatively thin sheet-like material is formed into an undulating pattern and shaped into a generally cylindrical shape, and elongated openings are created through said material, the improvement comprising:
- coining a discrete area for each end of each of the openings created through the material.
A method for forming a pressurized pulp screen basket comprising the steps of:
- bending relatively thin sheet-like material into an undulating pattern;
- coining discrete, spaced regions on the material;
- and
- creating slot-like openings in the sheet material, each of said slot-like openings extending from one coined region to an adjacent coined region.
In a method for forming a slotted screen basket for pressurized pulp screens, the improvement comprising:
- prestressing discrete regions of the screen basket at each of the ends of slots in the screen basket.
In a slotted screen basket for use in pressurized pulp screens, the improvement comprising:
- a discrete, prestressed area provided at each end of each slot in the basket.
Dependencies are inferred from the claim text.