Method and device for screening out particles

Details Method and device for screening out particles Method and device for screening out particles

2011-06-14

2011-06-14

Matthews, Terrell H (Department: 3653)

Classifying, separating, and assorting solids

Sifting

Plane sifters

C209S263000, C209S311000, C209S325000, C209S392000, C209S658000

Reexamination Certificate

active

07959008

ABSTRACT:
The invention relates to a method and a device for screening first particles out of a granulate comprised of first and second particles by conveying the granulate along a first screen surface which extends outward from a vibrating device, wherein the first particles have an aspect ratio a1, with a1>3:1, and the dimensions of the second particles allow them to fall through the mesh of the first screen surface. To screen a certain material fraction which differs geometrically from the remainder of the material in terms of at least one dimension out of the granulate, it is proposed that the granulate be conveyed along the screen surface between said surface and a cover which extends along the screen surface, and that the cover should cause the first particles to be aligned with their longitudinal axes extending along the screen surface, wherein the longitudinal extension of each first particle is greater than the mesh width of the screen which forms the first screen surface, and the longitudinal extension of the second particles is equal to or less than the mesh width.

REFERENCES:
patent: 2053038 (1936-09-01), Mackenzie
patent: 2329773 (1943-09-01), Leahy
patent: 4194970 (1980-03-01), Clem
patent: 4806235 (1989-02-01), Mueller
patent: 4875999 (1989-10-01), Haight
patent: 6763948 (2004-07-01), Ballman et al.
patent: 195 26 841 (1996-10-01), None

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