Production of a fine fraction using micro-perforated screens
-
Elisabeth Björk
,
Mikael Bouveng
Abstract
The objective for this work was to investigate the possibility to use a pressure screen equipped with a micro-perforated screen basket to produce a fine fraction from bleached chemical pulp. Trials were performed with unrefined bleached chemical hardwood pulp, and with unrefined and refined bleached chemical softwood pulp. The effect of feed concentration, feed flow, and volumetric fine fraction flow was evaluated. The difference between the fine fraction (i. e. the particles passing the screen) and the feed was analysed by studying the fibre morphology. The results showed that high feed concentration was positive for both the fine fraction concentration and the separation efficiency. A higher fine fraction concentration was also obtained when using hardwood pulp, which was explained by the shorter fibre length. Refining of the pulp prior to the fractionation proved beneficial, as a larger share of the refined pulp passed the screen, resulting in a twice as high concentration of the fine fraction when compared to unrefined pulp.
Funding statement: Financial support was received by Financial support was received by Stiftelsen för Kunskaps- och Kompetensutveckling, the Swedish Energy Agency, and the industrial partners participating in the CREPs (Production Concepts for Raw Material and Energy Efficient Products) research project at Rise: BillerudKorsnäs, Kadant NOSS, Metsä Board and Stora Enso.
Acknowledgments
The authors are grateful for the financial support from RISE Research Institutes of Sweden, The Knowledge Foundation and the companies participating in the CREPs project (Production Concepts for Raw Material and Energy Efficient Products) between 2010 and 2014. We also thank the staff at the pilot plant.
Conflict of interest: The authors declare no conflicts of interest.
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Articles in the same Issue
- Frontmatter
- Review
- Evolution of biobased and nanotechnology packaging – a review
- Chemical pulping
- Evaluation of sodium salt scaling in black liquor evaporators using existing process data
- Assessing the value of a diversified by-product portfolio to allow for increased production flexibility in pulp mills
- Bleaching
- Effect of introducing ozone in elemental chlorine free bleaching of pulp on generation of chlorophenolic compounds
- Chlorine dioxide bleaching of nineteen non-wood plant pulps
- A solid-phase extraction method that eliminates matrix effects of complex pulp mill effluents for the analysis of lipophilic wood extractives
- Mechanical pulping
- Development of fibre properties in mill scale high- and low consistency refining of thermomechanical pulp (Part 1)
- Measurement and interpretation of spatially registered bar-forces in LC refining
- Paper technology
- Production of a fine fraction using micro-perforated screens
- The effect of Plantago psyllium seed husk flour on the properties of cellulose sheet
- Comprehensive evaluation of the industrial processing effects on the fiber properties of the pulps from wood residues
- Paper chemistry
- Application of CS-CHO-g-PMMA emulsion in paper reinforcement and protection
- Effects of metal ions and wood pitch on retention and physical properties of TMP
- Coating
- Effect of the glass-transition temperature of latexes on drying-stress development of latex films and inkjet coating layers
- Nanotechnology
- Study of LCNF and CNF from pine and eucalyptus pulps
- Miscellaneous
- The component composition of planted pine wood cultivated in the boreal zone
Articles in the same Issue
- Frontmatter
- Review
- Evolution of biobased and nanotechnology packaging – a review
- Chemical pulping
- Evaluation of sodium salt scaling in black liquor evaporators using existing process data
- Assessing the value of a diversified by-product portfolio to allow for increased production flexibility in pulp mills
- Bleaching
- Effect of introducing ozone in elemental chlorine free bleaching of pulp on generation of chlorophenolic compounds
- Chlorine dioxide bleaching of nineteen non-wood plant pulps
- A solid-phase extraction method that eliminates matrix effects of complex pulp mill effluents for the analysis of lipophilic wood extractives
- Mechanical pulping
- Development of fibre properties in mill scale high- and low consistency refining of thermomechanical pulp (Part 1)
- Measurement and interpretation of spatially registered bar-forces in LC refining
- Paper technology
- Production of a fine fraction using micro-perforated screens
- The effect of Plantago psyllium seed husk flour on the properties of cellulose sheet
- Comprehensive evaluation of the industrial processing effects on the fiber properties of the pulps from wood residues
- Paper chemistry
- Application of CS-CHO-g-PMMA emulsion in paper reinforcement and protection
- Effects of metal ions and wood pitch on retention and physical properties of TMP
- Coating
- Effect of the glass-transition temperature of latexes on drying-stress development of latex films and inkjet coating layers
- Nanotechnology
- Study of LCNF and CNF from pine and eucalyptus pulps
- Miscellaneous
- The component composition of planted pine wood cultivated in the boreal zone
