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Definition of kraft pulping

Kraft pulping involves cooking (digesting) wood
chips in an alkaline solution (sodium hydroxide,
hydrosulfide, and sodium sulfide) for several
hours during which time the chemicals attack the
lignin in the wood. The dissolved lignin is later
removed leaving behind the cellulose fibres.
Unbleached kraft pulp is dark brown in colour, so
before it can be used in many papermaking
applications it must undergo a series of bleaching
processes.

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