Rejects

Reject is the part that is not used in paper production . A major source of raw material in paper production is the collected waste paper . In the paper mill , the waste paper is broken up with a pulper or a sorting drum . The non-paper materials are removed and removed from the material flow. Depending on the process and quality of the waste paper, large quantities of paper fibers are also removed from the material flow. In addition to rejects, there are also deinking sludge and plaits. The main part consists of deinking sludge, which is mostly incinerated directly.

The following residues belong primarily to rejects:

Staples;
Foils, plastics from lamination and coating;
Textiles (e.g. bookbinding and binding threads);
Filling or coating pigments made from graphic papers;
Polystyrene and other plastics made from packaging materials;
Coating materials (lacquers), composites;
various foreign substances that were incorrectly separated;
Sand;
wet strength specks;
Paper fibers.

Braids consist of around 50% metal wires. The waste paper is usually delivered to the paper mill in bales. The bales are produced with a baler. The pressed bales are held in place with wire. The rest consists of non-paper fractions, such as plastics, metals, etc.

Deinking sludge is not one of the rejects, as it cannot be extracted using the usual sorting processes. Deinking sludge and glue residues can only be separated by chemical separation and flotation. 90% of rejects are waste . Most of it is burned. Landfilling has not been possible in Germany since 2005. When using household-collected waste paper, the amount of rejects is much higher than when returning from printing and factory production. The increasing use of varnishes in print finishing and the increased use of synthetic adhesives in bookbinding increase the amount of rejects compared to the comparable raw material or fiber recovery.