Refiner plates with logarithmic spiral bars

Details Refiner plates with logarithmic spiral bars Refiner plates with logarithmic spiral bars

2003-04-22

2008-08-05

Miller, Bena (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

C241S296000, C241S298000

Reexamination Certificate

active

07407123

ABSTRACT:
A special shape of bars on refining discs or plate segments (54) of a rotating disc refiner (10) is disclosed including a plurality of bars (76) generally extending outwards toward the outer end of the disk across its surface, arranged in a single, two or more radial zones (64, 66, 68), the plurality of the bars within a zone being curved with the shape of a logarithmic spiral. Disc refiners including such refining discs are also disclosed.

REFERENCES:
patent: 3589630 (1971-06-01), Danforth et al.
patent: 3674217 (1972-07-01), Reinhall
patent: 4023737 (1977-05-01), Leider et al.
patent: 4874136 (1989-10-01), Webster
patent: 5425508 (1995-06-01), Chaney
patent: 5893525 (1999-04-01), Gingras
patent: 6042036 (2000-03-01), Virving et al.
patent: 6276622 (2001-08-01), Obitz
patent: 6418927 (2002-07-01), Kullik
patent: 2002/0050066 (2002-05-01), Krauss

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