Contents 1 Measuring method 2 Application 3 References 4 External links

Measuring method[edit] The Kappa number is determined by ISO 302:2004.[1] ISO 302 is applicable to all kinds of chemical and semi-chemical pulps and gives a Kappa number in the range of 1-100. The Kappa number is a measurement of standard potassium permanganate solution that the pulp will consume. The measurement is inflated by the presence of hexenuronic acids in the pulp. These compounds are formed during the chemical pulping process, from the hemicelluloses. The Kappa number can be monitored by online Kappa analysers in a pulp mill, but these have to be calibrated with the ISO 302:2004 method.

Application[edit] The Kappa number estimates the amount of chemicals required during bleaching of wood pulp to obtain a pulp with a given degree of whiteness. Since the amount of bleach needed is related to the lignin content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction phase of the pulping process. It is approximately proportional to the residual lignin content of the pulp. K ≈ c*l K: Kappa number; c: constant ≈ 6,57 (dependent on process and wood); l: lignin content in percent The Kappa number for bleachable pulps are in the range of 25-30, sack paper pulps in the range 45-55 and pulps for corrugated fiberboard are in the range 60-90.

References[edit] ^ "ISO 302:2004 Pulps — Determination of Kappa number". International Organization for Standardization. 

External links[edit] Automated Kappa number analyzer Kappa number (lignin) analyzer v t e Paper History Manufacture/Papermaking Types Bible Blotting Bond Cardboard Cartridge Coated paper Construction Cotton (rag) Crêpe Display Dó Asphalt Glassine India Korean Kraft Laid Manila Newsprint Oatmeal Onionskin Origami Baking Building Rice Rolling Scritta Paperboard Security Seed Copy Stone Tar Thermal Tissue Tracing Transfer Tree-free Wallpaper Washi Waterproof Wax Wood-free Wove Writing Xuan Materials China clay Fiber crop Paper chemicals Papyrus Wood pulp Specifications Grammage Density Paper sizes Units of paper quantity Surface chemistry of paper Wet strength Manufacture and process Bleaching of wood pulp Calender Conical refiner Deinking Paper pollution Environmental impact of paper Handmade paper Hollander beater Kraft process Organosolv Paper machine Paper recycling Papermaking Soda pulping Sulfite process Industry Paper industry In Europe In Canada In India In Japan In the United States Paper mill List of paper mills   Category:Paper   Commons Retrieved from "" Categories: PapermakingHidden categories: Articles needing additional references from March 2016All articles needing additional references

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