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Research, Technology, Methods > technology > processing technology > pulping > chemical pulping > kraft pulping

Preferred Term:

kraft pulping

Definition:

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.

Concept Schemes:

NALT Core
NALT Full

Broader Concept:

chemical pulping

Entry Terms:

sulfate pulping
sulphate pulping

URI:

https://lod.nal.usda.gov/nalt/24652

Download this Concept:

RDF/XMLCreated 2006-01-19, last modified 2012-11-30

Closely Matching Concepts:

http://id.loc.gov/authorities/subjects/sh85130334

Exactly Matching Concepts:

http://id.agrisemantics.org/gacs/C15369
http://id.cabi.org/cabt/113084