PCT No. PCT/EP94/00211 Sec. 371 Date Aug. 3, 1995 Sec. 102(e) Date Aug. 3, 1995 PCT Filed Jan. 26, 1994 PCT Pub. No. WO94/16827 PCT Pub. Date Aug. 4, 1994The sieve efficiency can be increased in an improved sieve apparatus in such a way tat the sieve apparatus is equipped with a compulsory mixing device (5). By means of this, during the sieve process, the sieve product, which is moving forward along the main flow direction (1) to a delivery end (11), is thoroughly mixed, which produces the desired increase in sieve efficiency.
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