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Apparatus for spreading material serving for the manufacture of fiberboards

  • US 3,897,185 A
  • Filed: 11/07/1973
  • Issued: 07/29/1975
  • Est. Priority Date: 11/07/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for spreading a mixture of superfine, fine and coarser particles onto a particle carrier for subsequent pressforming into fiberboards and the like;

  • said apparatus comprising;

    particle supply means spaced vertically from said particle carrier and including means for supplying a heterogeneous mixture of superfine, fine and coarser particles to said particle carrier such that said mixture falls downwardly towards said particle carrier with a particle path centerline extending downwardly from said particle supply means to said particle carrier;

    upper particle classifying means disposed between said particle supply means and said particle carrier and including a plurality of upper conduit means at each of opposite lateral sides of the path centerline, the upper conduit means at one side of the path centerline having upper outlet openings which face correspOnding upper outlet openings of the upper conduit means at the other side of the path centerline, said upper outlet openings being spaced from one another in a direction transverse to said path centerline to permit passage therebetween of portions of said mixture while gas under pressure is discharged from said upper outlet openings to effect a classification of the particles with the superfine and fine particles spaced further from the path centerline than the coarser particles;

    lower particle classifying means disposed between said upper particle classifying means and said particle carrier and including a plurality of lower conduit means at each of said opposite lateral sides of the path centerline, the lower conduit means at one side of the path centerline having lower outlet openings facing in one direction away from the path centerline and the lower conduit means at the other side of the path centerline having lower outlet openings facing in an opposite direction away from the path centerline, said lower outlet openings at the one side of said centerline path being spaced from the lower outlet openings at the other side of the centerline path to form a space therebetween for the passage therethrough of a portion of the particle mixture without further classification by said lower particle classifying means while other portions of the particle mixture pass outwardly of said lower outlet openings and are further classified by gas under pressure exiting from said lower outlet openings, whereby boards can be constructed with that portion of the particle mixture which is classified only by the upper classifying means forming central board sections and that portion of the particle mixture which is classified by both the upper and lower classifying means forming edge board sections.

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