Kraft paper
paper or paperboard produced from chemical pulp produced in the kraft process
Kraft paper or kraft, also known as brown paper, is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.
Sack kraft paper (or just sack paper) is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
Description
Pulp produced by the kraft process is stronger than that made by other pulping processes; acidic sulfite processes degrade cellulose more, leading to weaker fibers, and mechanical pulping processes leave most of the lignin with the fibers, whereas kraft pulping removes most of the lignin present originally in the wood. Low lignin is important to the resulting strength of the paper, as the hydrophobic nature of lignin interferes with the formation of the hydrogen bonds between cellulose (and hemicellulose) in the fibers.
Kraft pulp is darker than other wood pulps, but it can be bleached to make very white pulp. Fully bleached kraft pulp is used to make high-quality paper where strength, whiteness, and resistance to yellowing are important.
Sack kraft paper is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
Name
Kraft paper, and the kraft process used to produce it, are named from the German word kraft, meaning strength, in reference to its mechanical properties. This shares an origin with the English word craft, leading to linguistic confusion with paper intended for artistic uses and paper craft.
Manufacture
Wood pulp for sack paper is made from softwood by the kraft process.
Begin with the source’s own compact description: “Kraft paper” is paper or paperboard produced from chemical pulp produced in the kraft process. The dossier treats that line as a proposition to test through Kraft, paper and paperboard, not as a finished interpretation.
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The phrase “paper or paperboard produced from chemical pulp produced in the kraft process” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated May 31, 2026. The linked authority identifier is Q1755609. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Kraft paper” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.