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US 12,516,472 B2Granted
Pulping methods, methods for manufacturing paperboard, and paperboard structures
AssigneeWestRock MWV, LLC
InventorsFritz G. Paulsen, John D. Dejarnette, Peter W. Hart
Life of this patent
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Abstract
A pulping method includes chemical cooking of softwood chips to retain a high lignin content of about 18% to about 28% by weight and fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight.
Claims20
A pulping method comprising:
- chemical cooking of softwood chips, whereby after the chemical cooking, a content of original lignin in the cooked softwood chips is in a range from about 18% to about 28% by weight, wherein the chemical cooking comprises at least one of a kraft chemical cooking process, a sulfite chemical cooking process, and a neutral sulfite semi-chemical (NSSC) chemical cooking process, and wherein the softwood chips are treated with mechanical delamination to enhance liquor penetration during the chemical cooking;
- and
- fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight.
Dependencies are inferred from the claim text.