Vertical pulpers are developed for continuous and periodic pulping of fibrous materials as there are chemical pulp, ground wood, waste paper, inclusive of papers with increased wet strength, machine broke, mineral wool, etc. The pulper is composed of welded vat with top steel adapter (stainless-steel), functional elements (stainless) formed of rotor, stator separating sieve and setting rim, bearing housing (gray cast iron) plugged with packing and front gear box which is joined to electromotor and to rotor shaft (by elastic coupling). The pulper stands on steel legs on concrete bed. All parts of the machine that are in contact with the pulped stock are made of stainless steel.
The principle of the machine working:
The pulper VV can work either periodically or continuously. The source of kinetic energy is rotor of new conception, which is rotating inside the paddle wheel collar equipped with breaking blades. Under the rotor is placed stator with holes or slots, which serves to calibration and discharging of pulped stock.
The rotation in the tub causes intensive turbulence of the stock. The rectifying blades on the inner surface of the pulper vat distribute the working area on 4 individual zones of flow. The flowing stock is returned by the blades from the vat periphery to the centre, i.e. in the area of active suction effect of the rotor.
This configuration ensures the intensive flow of the stock in all pulper vat volume even by higher operating consistency so that the inserted material is practically immediately wet. The process of pulping is most intensive in proximate distance of the rotor where is the highest specific density and energy.
The bigger not pulped parts of the stock are torn to small pieces through the impact of rotor and breaking blades. The processing of smaller parts proceeds between rotor and stator.