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US 7,520,958 B2Granted
Modified kraft fibers
AssigneeInternational Paper Company
InventorsZheng Tan, Gopal Goyal, Alexander A. Koukoulas
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Abstract
A method of producing a modified pulp comprising treating wood chips in an extraction process to remove hemicellose to form treated wood chips; and subjecting said treated wood chips to chemical or semichemical pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from about 5 to about 10% by dry weight of the modified pulp.
Claims14
A method of producing a modified Kraft pulp comprising:
- treating wood chips with an acidic solution in an extraction process with steam, a liquid comprising water or a combination thereof wherein prior to or during the treating step, a peroxide being present in the treatment acidic pH to remove 5% to 20% hemicellulose to form treated wood chips;
- and
- subjecting said treated wood chips to Kraft pulping to form a modified Kraft pulp wherein the amount of hemicellulose contained in the modified Kraft pulp is from more than 5% to up to and including about 9% by oven dried weight of the modified Kraft pulp;
- and
- bleaching said modified kraft pulp to form a modified kraft pulp.
2 more elements
Dependencies are inferred from the claim text.