High consistency pulping

Valmet’s high consistency pulper is a vertical-entry pulper designed for high efficiency. The rotor with hard-coated blade profile ensures good paper disintegration and effective separation of contaminants from fibers. Gentle slushing of high-consistency pulp minimizes the breakdown of contaminants such as plastics, adhesives, films and stickies. For deinked grades, the pulper promotes the detachment of printing ink and color particles with minimum particle dispersion, thus improving the downstream efficiency of screening, washing and flotation processes.

After slushing the pulp is discharged, either through a secondary pulper where contaminants and fibers are separated, or in highly contaminated raw material cases, through the pulper screen plate where reject at the end of the batch is fed to a drum screen for fiber recovery. In both cases these auxiliaries remove heavy trash and plastics, in addition to recovering fiber, and ensure the best preconditions for the next process stage.