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Fiber separation process

  • US 5,316,150 A
  • Filed: 03/02/1993
  • Issued: 05/31/1994
  • Est. Priority Date: 03/02/1993
  • Status: Expired due to Fees
First Claim
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1. A method for separating the long outer bast fibers from the short woody inner core fibers of herbaceous fiber producing plants comprising the steps of:

  • a. harvesting the plants using a short cut length;

    b. introducing the plants so harvested into a first core separator wherein the harvested plant fibers come into contact with a rotating spiked cylinder partially surrounded by a concave grated housing, said cylinder mounted adjacent to a means for producing air flow, said means mounted adjacent to a plurality of upwardly inclined moving conveyor surfaces having openings therein, whereby many of the woody innercore plant fibers are caught by the spikes in said cylinder and thrown through said grated housing leaving the longer outer bast fibers to pass onto said moving conveyor by said air flow means such that as said conveyors move said fibers upward, many more of the woody innercore fibers drop through the openings therein;

    thenc. introducing the bast fibers output from the first core separator into an identical second core separator; and

    thend. introducing the bast fibers from the previous step into a first incline separator wherein the fibers come into contact with a plurality of synchronously rotating spiked cylinders mounted adjacent to each other on an incline and above a set of grid bars having openings between them wherein, as the bast fibers are worked upward on the spiked cylinders, innercore fibers are removed and drop through the grid bar openings;

    thene. introducing the bast fibers output from the first incline separator into a second incline separator which is identical to the first incline separator except that the openings between the grid bars of said second incline separator are more narrow than the openings between the grid bars of the first incline separator; and

    thenf. introducing the bast fibers from the previous step into a saw cleaner wherein the fibers come into contact with a cylinder around which a spiked wire has been tightly wrapped, said cylinder mounted above a set of stationary grid bars, so that centrifugal force throws the innercore fibers through the grid bars and the separated bast fibers exit the saw cleaner;

    theng. introducing the bast fibers from the previous step into a jet air fiber separator wherein the fibers are blown against the facing edge of an adjustable blade for separation;

    thenh. introducing the bast fibers from the previous step into a four cylinder fiber cleaner wherein the fibers come into contact with four (4) synchronously rotating level-mounted spiked cylinders which are mounted above a set of horizontal grid bars under which a suction is applied, so that any remaining innercore fibers fall through the grid bars and very clean bast fibers exit the cleaner.

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