Technology for Reject Treatment and Recovery

-Fiber & Filler Recovery for Coated Paper and Board-

Abstract

The cleaner reject consists of valuable raw materials that can be reused in the process after treating them with our reject treatment technology, ATREX. Especially the paper and board mills producing coated grades have a lot of coating flakes in their current reject streams. The heavier the coating is the more difficult in deflaking with existing machinery. Double coated grades or coated board are good examples. When the reject stream is studied more carefully, one can detect fractions from fillers, coating flakes, residues from furnish like fiber knots or shives and contaminants like sand. When this stream is processed with ATREX reject recovery system, the target is to reach the original particles size distribution of coating pigments and fillers. At the same time fiber knots are disintegrated and shives grinded. It has been shown that all the fibers and more than 95% of the total reject stream can be recovered back to process. The pigment works as filler and the use of native filler can be subsequently reduced.