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Method of pre-treating woodchips prior to mechanical pulping

  • US 7,771,565 B2
  • Filed: 02/21/2006
  • Issued: 08/10/2010
  • Est. Priority Date: 02/21/2006
  • Status: Active Grant
First Claim
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1. A method of manufacturing a corrugating medium, the method comprising the acts of:

  • providing a first liquor that is not acidic or alkaline in nature;

    providing woodchips comprising wood fibers;

    cooking the woodchips in the first liquor, such that a pH of about 3 to about 4 is obtained after said cooking;

    prior to separating hydrolyzate, mechanically fiberizing the woodchips at a pH of about 3 to about 4 to form a pulp;

    subsequently adding a dilution liquor to the pulp, the dilution liquor including at least one alkali;

    thereafter separating hydrolyzate from the pulp;

    treating the pulp with a second liquor, the second liquor including a second at least one alkali;

    refining the pulp;

    blending the pulp with recycled fibers to form a blended pulp; and

    forming the corrugating medium using the blended pulp.

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