Patent ID: 8721841

Claim:
Pulper used in the paper industry that processes pulp which pulper comprises a pulper container ( 19 ), a punched plate screen ( 15 ) installed to the mentioned container, an accept outlet pipe ( 8 ) out of the lower part ( 3 ) of the container for the mass that has penetrated the punched plate screen ( 15 ) and a rotating mixing rotor located in the container ( 19 ) and equipped with mixing wings ( 1 ) and control wings ( 5 ) the purpose of which mixing rotor is to defibrate paper and mix the mass in the container ( 19 ) and that the mixing rotor further comprises a cylinder part ( 20 ) directed downwards towards the punched plate screen ( 15 ) and that rotates along the mentioned rotor to which cylinder part ( 20 ) cleaning wings ( 2 ) that clean the punched plate screen ( 15 ) are attached and which cylinder part ( 20 ) is located between the mixing wings ( 1 ) and the punched plate screen ( 15 ), and the control wings ( 5 ) are located on the outer edge of the bottom of the mixing wings ( 1 ), characterized in that the pulper comprises a dilution arrangement of the pulp that streams towards the punched plate screen ( 15 ) in which dilution arrangement the dilution water is brought along the pipework ( 9 ) inside the cylinder part ( 20 ) and is directed from the gaps ( 13 ) of the cylinder part to be mixed with the pulp stream before the mentioned stream has faced the cleaning wings ( 2 ) and the punched plate screen ( 15 ) in which case the consistency of the mass is adjusted to be thinner than in the pulping space ( 16 ) during the mixing.