Apparatus for producing pulp from lignocellulose-containing material

US4166584A · kind A · utility

Inventor

• Arne Asplund · Sollentuna, SE

Key dates

• Filing date: Dec 23, 1977
• Grant date: Sep 4, 1979
• Expiry date: Dec 23, 1997

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21D1/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Apparatus for producing pulp from lignocellulose-containing material in which the material is ground into grist in a grinding space defined between a rotating disc and a stationary disc mounted within a pressurized housing. Each disc comprises a series of annularly disposed arched segments having a plurality of radially extending bars and interconnecting transverse ribs defining a plurality of radially arranged pockets which in their radial cross sections have a curved contour. The pockets on one of the discs are offset radially from the pockets on the other disc, to allow the grist in the rotating pockets to be axially deflected by the centrifugal force created by the rotation and collected in an opposing offset pocket on the other disc. During the rotation of the disc, successive charges of grist deflected by the rotating pockets will force the grist previously collected in the stationary pockets to slide along the curved contour and be tilted or dumped into the corresponding offset rotating pocket. The portion dumped into the rotating pocket is sheared off by the following bar as it passes the opposing bar on the stationary disc and subsequently deflected by centrifugal force in…