Method of pre-treating woodchips prior to mechanical pulping
First Claim
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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.
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Abstract
A method of making pulp adapted to be used in forming corrugating medium is disclosed. The method comprises cooking woodchips in a first liquor in the absence of an alkali addition. The method further comprises mechanically fiberizing the woodchips to form a pulp. The method further comprises separating hydrolyzate from the pulp. The method further comprises treating the pulp with a second liquor, the second liquor including at least one alkali. The method further comprises refining the pulp.
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Citations
19 Claims
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1. A method of manufacturing a corrugating medium, the method comprising the acts of:
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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. - View Dependent Claims (2, 3)
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4. A method of manufacturing a corrugating medium, the method comprising the acts of:
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cooking woodchips in a first liquor such that an acidic pH is obtained, the woodchips comprising wood fibers; prior to separating hydrolyzate, mechanically fiberizing the woodchips 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. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A method of manufacturing a corrugated board, the method comprising the acts of:
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cooking woodchips in a first liquor such that an acidic pH is obtained, the woodchips comprising wood fibers; prior to separating hydrolyzate, mechanically fiberizing the woodchips 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; forming the corrugating medium using the pulp; and coupling the corrugating medium between a first outer ply of linerboard and a second outer ply of linerboard to form a corrugated board. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification