Dust removal in an opening and cleaning apparatus for fibrous materials
AssigneePlatt Saco Lowell Limited
InventorGerald Wild
Life of this patent
Estimating the term…
Abstract
In the opening and cleaning of fibrous materials apparatus is provided which includes a plurality of rotatable beaters within a housing, curved under grids beneath each rotatable beater, baffle plates above and between the beaters, a perforated screen positioned above and adjacent the beaters and a suction hood positioned over and embracing the whole upper surface of the perforated screen. The screen is inclined to the horizontal and the apparatus includes a suction duct extending across the lowermost edge for withdrawing air from an inlet slot along the opposite edge to create an air stream flowing over the whole surface of the screen such that dust and unusable fibres passing through the screen are carried away to a waste extraction duct.
Claims13
In an opening and cleaning apparatus for fibrous materials, including a beater, and a perforate screen positioned adjacent said beater such that said materials acted upon by said beater may contact a facing surface of said screen by impact to separate foreign materials including particulate dust and short unusable fibers from usable fibers of said fibrous materials, the improvement comprising
- said screen being positioned above said beater and being formed with perforations therethrough of a prescribed size sufficient to permit said dust particles and to prevent said usable fibers to pass and from passing therethrough, and
- means for providing a flow of air adjacent to and along the full perforate surface of said screen which is opposite said facing surface, said means including an inlet to said apparatus for receiving said air flow therethrough adjacent one edge of said opposite surface of said screen and an outlet from said apparatus for discharging said air flow therethrough adjacent another edge of said opposite surface of said screen, whereby said dust particles may be drawn through said perforations and into said air flow and said usable fibers are prevented from being so drawn.
In a method for extracting dust from fibrous materials in an opening and cleaning apparatus comprising forwarding said fibrous materials to contact a perforate surface of a perforated screen by impact to separate foreign materials including particulate dust from said fibrous materials, said screen perforations being such that they prevent usable fibres from passing therethrough but allow said dust therethrough, the improvement comprising
- causing an air stream to pass adjacent to and along the full perforate surface of said screen which is opposite said facing surface which is impacted by said fibrous materials, and
- admitting said air stream to said apparatus at said opposite perforate surface along one edge of said screen and discharging said air stream along an edge of said screen opposite thereto from said apparatus.
Dependencies are inferred from the claim text.