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Kraft paper. A roll of kraft paper. Kraft paper or kraft[1] 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. [2]
The kraft process involves treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S), known as white liquor, that breaks the bonds that link lignin, hemicellulose, and cellulose. The technology entails several steps, both mechanical and chemical. It is the dominant method for producing paper.
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
The invention of the recovery boiler by G. H. Tomlinson in the early 1930s [2] allowed kraft mills to recycle almost all of their pulping chemicals. This, along with the ability of the kraft process to accept a wider variety of types of wood and produce stronger fibers [4] made the kraft process the dominant pulping process starting in the ...
Pulp is a fibrous lignocellulosic material prepared by chemically, semi-chemically or mechanically producing cellulosic fibers from wood, fiber crops, waste paper, or rags. Mixed with water and other chemicals or plant-based additives, pulp is the major raw material used in papermaking and the industrial production of other paper products. [1] [2]
Black liquor. In industrial chemistry, black liquor is the by-product from the kraft process when digesting pulpwood into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers. [1] The equivalent material in the sulfite process is usually called brown liquor, but the terms red liquor, thick ...
More than 90% of the fluff pulps are fully bleached chemical softwood pulps, of which more than 90% are kraft pulps. The most common raw material source for fluff pulps are southern bleached softwood kraft from loblolly pine. SBSK from other species and NBSK are also used to make fluff pulp. [4] Thicker fibres are preferred to improve the bulk.
Paper recovery, instead of landfilling can reduce the global warming potential of paper products by 15 to 25%. [51] At pulp and paper mills in the U.S., the GHG emission rate expressed in tons of carbon dioxide equivalents per ton of production has been reduced by 55.8% since 1972, 23.1% since 2000, and 3.9% compared to 2010. [52]
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