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The influence of recycling on the surface-structural characteristics
Authors: Chalupa Jiří | Milichovský Miloslav | Češek Břetislav
Year: 2005
Type of publication: ostatní - přednáška nebo poster
Name of source: 3-rd Int. Student's Seminar on Chemistry and Technology of Wood, Pulp and Paper
Publisher name: Trade Fair EmbaxPrint
Place:
Page from-to:
Titles:
Language Name Abstract Keywords
cze Vliv recyklace na povrchově-strukturní charakteristiky Vliv recyklace na povrchově-strukturní charakteristiky papíru, během navlhacích testů. recyklace papíru, WRV, sktruktura, navlhání papíru
eng The influence of recycling on the surface-structural characteristics The paper humidification is ussuall effect. The paper is atacted by air with the relative humidity higher than zero. The advantage of paper products is hygroskopicity,but on the other hand causes some discrepancies of paper quality. These discrepancies hold down application of paper products. (The complete understanding of humidification process is necessary presumption for further paper expanse utilization.) The hygroscopicity of paper mass is very important behaviour especially for using of paper as packaging material. A moistening is measured at different relative humidity. The relative humidity is created by solution of inorganic salts and also by organic liquid. We have described the kinetic of paper and moulded fibre products humidification from start to equilibrium by following empirical equation (MMF). Basic equation of thermodynamics is Kelvin`s equation. From Kelvin`s equation is ensued the value of maximal equivalent cylindrical pore radius, which being occupied yet by condensed water in pore material. It`s possible to simply obtain characteristics of paper for example: value of maximal equivalent cylindrical pore radius, compactness, wet porosity,total porosity etc. The knowledge of strength and bonding properties of pulp fibres is key demand in well controlled papermaking process. Both of these demands it is possible to estimate by so called rheosedimentation method, i.e. by observation and evaluation of typical phenomenon of diluted pulp slurries with appropriate papermaking properties during their sedimentation. Both received the standard velocity of rheosedimentation, vs and final concentration of sediment, ck are characteristic parameters of pulp fibres depending on their geometry, structure and mechanical properties in wet state and bonding abilities. WRV is the last metod which was used .The value of WRV is depending on bonding system. And then on abrasion surface of fibres so. paper recycling, WRV, structure, paper humidification

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