Low Consistency Pulping
Low consistency and medium to high consistency pulping applies for most virgin pulp and brown grade Applications. Kadant's latest
design using a D tub associated with the new generation raised Vokes rotor enables a significant reduction in size and in energy consumption. Kadant has over 1000 references, with several low consistency pulpers having capacities of over 1000 metric tons per day.
Working Principle
Low consistency pulpers can be operated continuously or batch wise. The pulper rotor includes pumping vanes and deflaking vanes in order to create both a strong circulation of the stock and a powerful disintegration effect when the stock is in contact with the pulper rotor. The design of the bottom deflectors helps this action, and the short baffle (D shape of the tube) induces a very powerful vortex which attracts almost instantaneously the non defibered papers against the rotor.
Batch operation is generally promoted for virgin pulp in order to obtain uniform quality, taking into account changes in the fibre composition.For most secondary fibre Applications, the pulper is operated continuously in order to minimize sizing and optimize both capital and operation cost.
Applications
- Virgin pulp lines
- Broke lines
- Non de inking secondary fibre lines
Benefits
- Excellent defibering, enabling limited fibre losses, the use of smaller holes in the pulper and in downstream screens
- Smaller sizing and reduced operation costs
- Excellent runnability and easy maintenance
- The largest number of references in the world
- The most integrated and modular concept for coarse contaminant removal at low and medium consistency with the Hydrapurge/Selectpurge, Junk trap, Trash well and Select trap de-trashing equipment