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u www.tugraz.at
Fractionated treatment and
separate refining of pulp to reduce
energy consumption
17.11.2015
Rafael Giner ...
Outline
• Introduction
• Fractionation and separate refining
• Results
• Conclusions
17.11.2015
Rafael Giner Tovar
2
Introduction
Why refining?
• Refining
 Process engineering → milling process
 Pulp and paper industry → forming process
...
• Refining needed in stock preparation, improving
 fibre-fibre bonding ability
 sheet formation
 physical properties of...
17.11.2015
Rafael Giner Tovar
5
Introduction
Thermomechanical Pulp (TMP) Plant
Outline
• Introduction
• Fractionation and separate refining
• Results
• Conclusions
17.11.2015
Rafael Giner Tovar
6
Fractionation and separate refining
• Fractionation is used to separate pulp into fine and coarse fraction
• Fine fraction...
Fractionation and separate refining
Types of refiners
• Lab scale
 Jokro mill
 PFI Mill
 Valley Beater
• Industrial ref...
Fractionation and separate refining
Fractionation on the lab scale
Preparation of the sample
17.11.2015
Rafael Giner Tovar...
1. Refining of the entire sample (reference)
2. Refining of the coarse fraction
3. Refining of the fine fraction
• Refinin...
• Preparation of handsheets (Rapid-Köthen)
• Determination of properties such as thickness/density, tensile
strength, beat...
Outline
• Introduction
• Fractionation and separate refining
• Results
• Conclusions
17.11.2015
Rafael Giner Tovar
12
17.11.2015
Rafael Giner Tovar
13
0
20
40
60
80
100
120
140
160
180
Thickness(µm)
Thickness
Unrefined
Entire sample
Coarse ...
Outline
• Introduction
• Fractionation and separate refining
• Results
• Conclusions
17.11.2015
Rafael Giner Tovar
14
Conclusions
• Refining improves the paper properties
• Promising results when the coarse fraction is refined compared to
r...
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Fractionated treatment and separate refining of pulp to reduce energy consumption

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By Rafael Giner, University Assistant, Scientist-Technical University of Graz. This was presented during the New Ideas for the Paper Industry: Young Researchers' Presentations session, organised as part of European Paper Week 2015. More at http://www.cepi.org/epw

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Fractionated treatment and separate refining of pulp to reduce energy consumption

  1. 1. u www.tugraz.at Fractionated treatment and separate refining of pulp to reduce energy consumption 17.11.2015 Rafael Giner Tovar Institute of Pulp, Paper and Fibre Technology 1
  2. 2. Outline • Introduction • Fractionation and separate refining • Results • Conclusions 17.11.2015 Rafael Giner Tovar 2
  3. 3. Introduction Why refining? • Refining  Process engineering → milling process  Pulp and paper industry → forming process • Through refining, fibres are…  internally fibrillated → higher flexibility  externally fibrillated → fines production, higher bonding area  long fibres are shortened  ideally, short fibres are not affected  better fibre-fibre bonding 17.11.2015 Rafael Giner Tovar 3
  4. 4. • Refining needed in stock preparation, improving  fibre-fibre bonding ability  sheet formation  physical properties of the final product • Unrefined pulp  lower sheet strength  rough surface • Chemical and mechanical pulp need to be refined before they become suitable for papermaking Refining can represent up to 60% of the total power consumption 17.11.2015 Rafael Giner Tovar 4 Introduction Why refining?
  5. 5. 17.11.2015 Rafael Giner Tovar 5 Introduction Thermomechanical Pulp (TMP) Plant
  6. 6. Outline • Introduction • Fractionation and separate refining • Results • Conclusions 17.11.2015 Rafael Giner Tovar 6
  7. 7. Fractionation and separate refining • Fractionation is used to separate pulp into fine and coarse fraction • Fine fraction  can have higher tensile strength than the coarse fraction  their properties do not improve through refining • Coarse fraction  only the coarse fraction needs to be refined  refining only coarse fraction energy consumption could be reduced • Different types of fractionation devices available 17.11.2015 Rafael Giner Tovar 7
  8. 8. Fractionation and separate refining Types of refiners • Lab scale  Jokro mill  PFI Mill  Valley Beater • Industrial refiner (e.g)  Voith Sulzer Twinflo E 17.11.2015 Rafael Giner Tovar 8 (PFI Mill, Frank-PTI) (Valley Beater, Frank-PTI) (Jokro Mill, Frank-PTI)
  9. 9. Fractionation and separate refining Fractionation on the lab scale Preparation of the sample 17.11.2015 Rafael Giner Tovar 9 Mesh 16 Mesh 30 Mesh 50 Mesh 200 Fines Fine fraction Coarse fraction Bauer McNett
  10. 10. 1. Refining of the entire sample (reference) 2. Refining of the coarse fraction 3. Refining of the fine fraction • Refining performed using a Jokro Mill  600 rpm in desintegrator  20 minutes, 150 rpm  240 rpm in desintegrator 17.11.2015 Rafael Giner Tovar 10 Fractionation and separate refining Refining on the lab scale
  11. 11. • Preparation of handsheets (Rapid-Köthen) • Determination of properties such as thickness/density, tensile strength, beating degree (°SR), air permeability 17.11.2015 Rafael Giner Tovar 11 Coarse Mesh (16) Fine Mesh (30,50,200) Fines (<200) BrittJar Jokro- mill Mixture representing whole pulp Sheet- forming Fractionation and separate refining Sheet forming and mechanical testing Refining of the coarse fraction
  12. 12. Outline • Introduction • Fractionation and separate refining • Results • Conclusions 17.11.2015 Rafael Giner Tovar 12
  13. 13. 17.11.2015 Rafael Giner Tovar 13 0 20 40 60 80 100 120 140 160 180 Thickness(µm) Thickness Unrefined Entire sample Coarse fraction refined Fine fraction refined 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Breakinglengh(m) Breaking length Unrefined Entire sample Coarse fraction refined Fine fraction refined 0 2 4 6 8 10 12 14 16 18 °SR Schopper-Riegler Unrefined Entire sample Coarse fraction Fine fraction 0 1000 2000 3000 4000 5000 6000 Airpermeability(ml/min) Air permeability Unrefined Entire sample Coarse fraction refined Fine fraction
  14. 14. Outline • Introduction • Fractionation and separate refining • Results • Conclusions 17.11.2015 Rafael Giner Tovar 14
  15. 15. Conclusions • Refining improves the paper properties • Promising results when the coarse fraction is refined compared to refining the whole sample  Similar effect on dewatering  Comparable results on thickness  Comparable results on air permeability  40% less material refined → similar increase in breaking length → energy savings • Future trials using different pulps and coarse/fine fraction ratios 17.11.2015 Rafael Giner Tovar 15

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