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Method of making dimensionally stable composite board and composite board produced by such method

  • US 5,028,286 A
  • Filed: 04/14/1989
  • Issued: 07/02/1991
  • Est. Priority Date: 12/28/1984
  • Status: Expired due to Term
First Claim
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1. A method of making synthetic board comprising the steps of:

  • (a) forming a pretreated cellulosic material in a pretreatment step by subjecting particle form cellulosic material, to the non-explosive action of steam for a period of one to six minutes at a pressure in the range of 350 to 150 psig to thereby form said pretreated cellulosic material which can result in lowering xylan content for hardwoods and the content of xylan, mannan and galactan for softwoods;

    (b) forming a mat comprising a plurality of layers of particle form cellulosic material and wherein at least some layers of the mat are formed from said pretreated cellulosic material, and(c) subjecting said mat to a single treatment of heat and pressure so as to avoid cellular breakdown, to form said composite board, said formed board having improved dimensional stability due to the presence of the pretreated cellulosic material subjected to said pretreatment step of steam and pressure.

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