Patent ID: 8919568

Claim:
A screening for use in classifying material flowing through said screening, said screening comprising: (a) a plurality of warp screening elements, said plurality of warp screening elements includes a first warp screening element having a plurality of horizontal undulations, said plurality of warp screening elements further including a second warp screening element having a plurality of horizontal undulations; (b) at least one retaining member operably associated with said plurality of warp screening elements to form an integral screen segment having a plurality of openings for permitting material to be classified to pass through said openings; and, (c) said first warp screening element having at least one characteristic different from said second warp screening element to prevent blinding of said integral screen segment, said at least one characteristic affecting movement of said first warp screening element and said second warp screening element when said integral screen segment is used to classify material such that at least one of amplitude and frequency of movement of said first warp screening element is different from at least one of amplitude and frequency of movement of said second warp screening element when said first warp screening element and said second warp screening element are subject to the same operating condition, said at least one characteristic being spring rate, said first warp screening element having a first spring rate and said second screening element having a second spring rate, said first spring rate is different from said second spring rate.