Patent ID: 7943008
Filing Date: 2011-05-17
Classification: D21B,D21C

Abstract:
1. A method of manufacturing a corrugating medium, the method comprising the acts of: providing woodchips comprising wood fibers; cooking the woodchips in a 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; after adding the dilution liquor to the pulp, 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; and forming the corrugating medium using the pulp.