Patent ID: 6379505
Filing Date: 2002-04-30
Classification: D21B

Abstract:
A pulper for defibration of a liquid solid mixture suspension, said pulper comprising:a) a vertically oriented vessel defining a chamber, the vessel having a lower portion, an internal side adjacent the chamber and an external side opposite the chamber; b) means for pulping and generating a toroidal flow of the suspension in the chamber; c) a truncated cone-shaped screening device to separate coarse materials from the suspension, the screening device being subdivided into a plurality of segments mounted on the internal side of the vessel adjacent the lower portion of the vessel, the screening device having a lateral surface disposed approximately tangential to the toroidal flow and a plurality of holes in the lateral surface; d) a plurality of webs located adjacent the lower portion of the vessel between the vessel and the plurality of segments, wherein the plurality of segments are individually fixed on the webs; and e) a plurality of screws inserted into the lower portion of the vessel and engaging the webs, wherein the screws are accessible from the external side of the vessel; f) wherein the plurality of segments are individually detachable from the internal side of the vessel upon removal of the screws from the external side of the vessel.