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A compound disc is used to eliminate a secondary slot normally formed between the outside perimeter of discs on adjacent shafts of a material separation screen. The compound disc includes a primary disc joined to an associated secondary disc. The primary disc and the secondary disc each have the sam

A compound disc is used to eliminate a secondary slot normally formed between the outside perimeter of discs on adjacent shafts of a material separation screen. The compound disc includes a primary disc joined to an associated secondary disc. The primary disc and the secondary disc each have the same shape but the secondary disc has a smaller outside perimeter and is wider. The primary disc and associated secondary disc are formed from a unitary piece of rubber. The compound discs are interleaved with oppositely aligned compound discs on adjacent shafts. In other words, the large disc is positioned laterally on a shaft to longitudinally align with a smaller disc on an adjacent shaft. The oppositely aligned and alternating arrangement between the large discs and small discs eliminate the secondary slot that normally exists in disc screens.

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1. Multiple discs for a material separation screen, comprising:primary discs on a first shaft; secondary discs on the first shaft; at least some of the primary discs and secondary discs on the first shaft located against adjacent lateral sides to form compound discs, the compound discs on the first

1. Multiple discs for a material separation screen, comprising:primary discs on a first shaft; secondary discs on the first shaft; at least some of the primary discs and secondary discs on the first shaft located against adjacent lateral sides to form compound discs, the compound discs on the first shaft aligned with discs on a second shaft so that the discs on the first and second shafts at least partially overlap to form a non-linear gap; and wherein compound discs on the first shaft are spaced apart from each other.