Evaluation of fines separation from unbleached softwood kraft pulp using microperforated hole screens
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D. Mandlez
and
W. Bauer
Abstract
The application of a bench scale and an industrial scale pressure screen to separate cellulosic fines from an unbleached softwood kraft pulp containing 5 % (w/w) primary fines was investigated and the results were compared. In the bench scale trials different microperforated screens with hole diameters of 150 µm, 250 µm, 400 µm and 600 µm were used. Based on these results a screen hole diameter of 400 µm was selected for the industrial scale trials. In all cases, a high accept flow rate proved to be the crucial parameter for high removal efficiency of the fines material and a removal efficiency of well above 50 % could be achieved. Further of interest were the limiting factors regarding increased accept flow rates with a focus on the interrelations between pressure difference, slot velocity and reject consistency. As expected, investigation of electric energy demand showed a correlation between removal efficiency and specific energy consumption, which did not exceed 35 kWh/t(od) feed.
Funding source: Bundesministerium für Verkehr, Innovation und Technologie
Funding source: Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Funding source: Amt der Steiermärkischen Landesregierung
Funding source: Amt der Kärntner Landesregierung
Funding source: Österreichische Forschungsförderungsgesellschaft
Funding statement: We are grateful for the support by our industry partners in the frame of the FLIPPR2 project, Mondi, Sappi, Zellstoff Pöls AG, a member of Heinzel pulp, and Papierholz Austria. The K-Project FLIPPR2 (grant number: 861476) is funded as part of COMET – Competence Centers for Excellent Technologies promoted by BMVIT, BMWFW, Styria and Carinthia. The COMET program is managed by FFG.
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Conflict of interest: The authors declare no conflicts of interest.
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Supplemental Material
The online version of this article offers supplementary material (https://doi.org/10.1515/npprj-2020-0110).
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Articles in the same Issue
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Articles in the same Issue
- Frontmatter
- Chemical pulping
- Evaluation of fines separation from unbleached softwood kraft pulp using microperforated hole screens
- Evaluation of pulp and paper making properties of Caesalpinia decapetela
- Novel bulking technologies for cellulose fibres
- Mechanical pulping
- Interpretation of force profiles in mill-scale LC refining
- Effects of plate wear on bar forces and fiber properties in a mill scale LC-refiner
- Paper technology
- Research on the physical properties of calcium sulfate whisker and the effects of its addition on paper and its printing performance
- Preparation and properties of an intelligent adjustable functional paper for organic cultural relics
- Paper chemistry
- Application of DSA to improve strength of thermomechanical pulp blended paper
- Coating
- The influence of pigment modulus on failure resistance of paper barrier coatings
- Effect of filler additions on pilot-scale extrusion coating of paperboard with PLA-based blends
- Packaging
- Influence of paper properties on adhesive strength of starch gluing
- Environmental impact
- Interfering elements on determination of hexavalent chromium in paper materials with UV-vis spectrophotometry
- Nanotechnology
- Enhanced mechanical and gas barrier performance of plasticized cellulose nanofibril films
- Lignin
- The preparations of nanoporous carbon with multi-heteroatoms co-doping from black liquor powders for supercapacitors
- Miscellaneous
- Hybrid films from plant and bacterial nanocellulose: mechanical and barrier properties
- Mass-balance based soft sensor for monitoring ash content at two-ply paperboard manufacturing
- Investigation of the effect of light fastness on the color changes of maps prepared by electrophotographic digital printing
- Bulking of cellulose fibres – a review
- Preparation of O-HACC/HEC-acrylate emulsion and its application in paper protection
- Mineral-filled biopolyester coatings for paperboard packaging materials: barrier, sealability, convertability and biodegradability properties
