Tramp material separator

US4737274A · kind A · utility

Assignee

• Kamyr AB · SE

Inventors

• Finn Jacobsen · Karlstad, SE
• Rolf Ekholm · Karlstad, SE

Key dates

• Filing date: Jul 7, 1986
• Grant date: Apr 12, 1988
• Expiry date: Jul 7, 2006

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21D5/20
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Effective separation of unwanted particles, such as tramp material, is effected from a paper pulp suspension (typically a medium consistency suspension, e.g. having a consistency between 5-15 percent). A generally annular opening is defined by a disc connected to a rotating shaft, and a ring stationarily mounted to a housing. The housing includes a pulp inlet, a pulp outlet, an inlet chamber, and an outlet chamber, with a separated-out particles outlet communicating with the inlet chamber, preferably extending downwardly from it. A rotating element having a plurality of generally radially extending projections, is also mounted on the shaft, adjacent the disc, and the projections cover the annular opening (radially spanning it) at spaced locations along its circumference. The projections may be teeth-like structures, or pegs, and preferably have their leading edges, viewed in the direction of rotation, sloping with respect to the radial direction. A plurality of vanes are also connected to the shaft in the outlet chamber. The shaft rotates at such a speed that fluidization of the pulp by the rotating element takes place. Not only are particles having their largest dimension equal to…