Refiner plate with variable pitch

  • US 5,893,525 A
  • Filed: 07/01/1997
  • Issued: 04/13/1999
  • Est. Priority Date: 07/01/1997
  • Status: Expired due to Term
First Claim
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1. A rotating disc refiner segment for refining a lignocellulosic material with production of steam which is transported substantially radially along the segment, the segment comprising:

  • a plurality of substantially radially extending bars and a plurality of substantially radially extending channels disposed intermediate said bars to form a pattern of bars and channels, each said channel having a channel width and a lower base surface at the bottom of said channel, each of said bars having a top surface and substantially radially extending first and second edges, the top surface of at least one of said bars having at least one radially extending groove formed therethrough intermediate said first and second edges, each of said grooves having a groove width and an intermediate base surface disposed at a height intermediate said top surfaces and said lower base surfaces, said groove width being less than said channel width at a corresponding relative height of said channel;

    whereby significantly more steam is transported substantially radially outwardly through the channels than through the grooves.

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