Purifier

A purifier turns semolina into clean middlings by combining air, screen and inclination. It is the machine most often blamed for an ash problem that actually started at the rolls, because a purifier out of adjustment sends the wrong fraction to the wrong stream. Brush condition, screen tension and the eccentric drive all matter, and so does the air setting at the inlet. If the ash curve moves without a change in wheat, the purifier is worth checking before anything else on the floor.