The Alpine TTSP Toner Classifier was developed especially for dedusting toner. The demands made of the end-product quality in toner processing are so high that particle counters (Coulter Counter) are employed for the quality control. Specification of the dedusted coarse material is given in number%, whereby the specification generally permits 3-10 number% < 5 µm. The focus of attention during development was a maximum precision of cut, although other aspects such as handling and safety as well as operating and installation costs were also taken into account.

The feed material is dispersed by the classifying wheel and transported through the same by the classifying air. The dust entrained in the air is transported through the support wheel and discharged via the fines discharge. The coarse product is rejected by the classifying wheel and conveyed to the coarse material discharge. The product routing is designed such that no back-mixing can occur and a high quality of dust removal is ensured. The special configuration with the support wheel is patented; it permits optimum access for quick and thorough cleaning at minimum downtime