Expectation of Paper makers

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Expectation of Paper makers from Clothing suppliers.

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Expectation of Paper makers

  1. 1. EXPECTATIONS OF PAPER MAKERS FROM THE CLOTHING SUPPLIERS FOR EFFICIENT DRAINAGE AND GOOD PRINTABILITY BARATHI G MEHROTRA A K M/s Seshasayee Paper & Boards Limited, ERODE 638 007
  2. 2. G Barathi: A Pulp & Paper Technologist from IITR and MBA (Marketing). Having experience of nearly 18 years in Paper Making Process with good analytical skill and Trouble shooting skill. Having conversant with Writing & Printing Paper with Virgin fiber and Recycled Fiber, Multilayer Kraft machine. Experienced in Project commissioning.
  3. 3. Challenging Demands <ul><li>Higher Paper machine speeds…. </li></ul><ul><li>Lower Basis weight…. </li></ul><ul><li>Higher Printing Press speeds…. </li></ul><ul><li>Better Quality demands of print media…. </li></ul><ul><li>@ COMPTETIVE COST </li></ul>
  4. 4. Paper Makers Expects….. <ul><li>CLOTHINGS </li></ul><ul><ul><li>Not just conveying the web </li></ul></ul><ul><ul><li>Not just dewatering </li></ul></ul><ul><ul><li>to provide maximum efficiency with little or no DOWN-TIME. </li></ul></ul>
  5. 5. How to achieve maximum efficiency? <ul><li>Selection of proper Clothing </li></ul><ul><li>Good Operating Practices & Procedures </li></ul>
  6. 6. Essential Requirement of Quality Paper <ul><li>Good Printability </li></ul><ul><li>Excellent Visual Characteristics </li></ul><ul><li>Optimal running at Printing press </li></ul><ul><li>Should pass through Multi-color Printing press </li></ul>
  7. 7. Key Properties of Quality Paper <ul><li>Uniform Basis weight & Caliper </li></ul><ul><li>Uniform Formation </li></ul><ul><li>Minimum two-sidedness with respect to shade and smoothness </li></ul><ul><li>Adequate strength and surface properties </li></ul><ul><li>Dimensional Stability </li></ul><ul><li>Uniform Shade </li></ul><ul><li>Absence of Surface Defects </li></ul>
  8. 8. Share Our Experience <ul><li>These Properties are greatly influence by </li></ul><ul><li>Forming Fabrics </li></ul><ul><li>Press felts </li></ul><ul><li>Dryer screens </li></ul><ul><li>Let’s share SPB’s Experience…. </li></ul>
  9. 9. SPB – Paper Machine # 5 <ul><li>Make : VOITH </li></ul><ul><li>Head Box : Hydraulic W type with Top lip Anti-deflection control </li></ul><ul><li>Wire Part : Duoformer F </li></ul><ul><li>Press Part : Duo-centri II with Suction Pick up, PU covered CC rolls in I and III Nip Position </li></ul>
  10. 10. SPB – Paper Machine # 5 <ul><li>Dryer : 1 st and 2 nd Uni-run </li></ul><ul><li>3 rd , 4 th , 5 th , 6 th – Conventional Top & Bottom group </li></ul><ul><li>Speed Sizer : Voith Film Press </li></ul><ul><li>Calendar : Single stack with CI rolls </li></ul><ul><li>Automation : ABB-DCS – Advant station 500 series </li></ul><ul><li>QCS – Accuray 1190 version </li></ul>
  11. 11. SPB – Paper Machine # 5 <ul><li>Average Production : 180 t/day </li></ul><ul><li>GSM Range : 45 to 140 </li></ul><ul><li>Speed : 400 to 950 mpm </li></ul><ul><li>Furnish : </li></ul><ul><ul><li>70 – 80% Captive Bleached Hardwood Pulp (ECF Bleached) </li></ul></ul><ul><ul><li>20 – 30 % Captive Bleached Chemical Bagasse Pulp (ECF Bleached) </li></ul></ul><ul><li>Products : </li></ul><ul><ul><li>Woodfree Printing & Writing Paper </li></ul></ul><ul><ul><li>Surface Sized Maplitho Paper </li></ul></ul><ul><ul><li>Pigment Coated Paper </li></ul></ul><ul><ul><li>Copier Grades </li></ul></ul><ul><ul><li>Coating Base Paper </li></ul></ul>
  12. 12. FORMING FABRICS should ensure….
  13. 13. FORMING FABRICS - Our specifications
  14. 14. FORMING FABRICS - Our specifications
  15. 15. FORMING FABRICS – Our Experiences <ul><li>Advantages of TRIPLE layer: </li></ul><ul><ul><li>Thanks to higher FSI, better Retention and less Web Breaks </li></ul></ul><ul><ul><li>Extended Life due to higher Caliper of Fabric and more diameter of Bottom weft </li></ul></ul><ul><ul><li>Good drainage </li></ul></ul><ul><ul><li>BUT…… </li></ul></ul><ul><ul><li>Some times high moisture after couch </li></ul></ul><ul><ul><li>Fines throw towards Top wire </li></ul></ul>
  16. 16. FORMING FABRICS – Our Experiences <ul><li>We tried….. </li></ul><ul><li>For TOP & Bottom position, </li></ul><ul><ul><li>Double layer with Double layer </li></ul></ul><ul><ul><li>Double layer with Triple layer </li></ul></ul><ul><ul><li>Triple layer with Triple layer </li></ul></ul>
  17. 17. FORMING FABRICS – Our Experiences
  18. 18. FORMING FABRICS – Our Experiences
  19. 19. FORMING FABRICS – Our Experiences
  20. 20. FORMING FABRICS – Our Experiences
  21. 21. BENEFITS OF HIGH RETENTION
  22. 22. PRESS FELTS – Our specifications
  23. 23. PRESS FELTS – Our Experience….
  24. 24. PRESS FELTS – Our Experience…. <ul><li>As can be seen…. </li></ul><ul><li>Performance of Imported Press felts is superior with respect to </li></ul><ul><ul><li>OFF-Press Moisture </li></ul></ul><ul><ul><li>Better Runnability </li></ul></ul><ul><ul><li>Extended Life </li></ul></ul>
  25. 25. DRYER SCREENS – Our specifications <ul><li>1 st Unirun : 95 cfm </li></ul><ul><li>2 nd Unirun : 110 cfm </li></ul><ul><li>3 rd Group : 150 cfm </li></ul><ul><li>4 th Group : 250 cfm </li></ul><ul><li>5 th Group : 250 cfm </li></ul><ul><li>6 th Group : 250 cfm </li></ul>
  26. 26. DRYER SCREENS – Our experience…. <ul><li>For Unirun Groups, we use Imported screens to contain sheet fluttering. </li></ul><ul><li>For Conventional groups, we use both Imported and Indigenous screens. </li></ul>
  27. 27. DRYER SCREENS – Our experience…. <ul><li>Indigenous screens are comparable in steam demand. </li></ul><ul><li>The difficulties with the indigenous screens are </li></ul><ul><ul><li>Relatively short life </li></ul></ul><ul><ul><li>Mounting delays </li></ul></ul><ul><ul><li>Seaming time for indigenous and imported screens are 1 ½ hour and ½ hour respectively. </li></ul></ul>
  28. 28. DRYER SCREENS – Our experience…. <ul><li>But for seaming delays and relatively short life, indigenous screen performance is satisfactory. </li></ul><ul><li>No Screen mark </li></ul><ul><li>No edge damages </li></ul><ul><li>No slack edges and fluttering of screens </li></ul><ul><li>Thus avoiding moisture variation across deckle of sheets. </li></ul>
  29. 29. EXPECTATIONS FROM CLOTHING SUPPLIERS <ul><li>Forming Fabric: </li></ul><ul><ul><li>The forming fabric should stay flat during web formation throughout the life span. For good profile quality, the fabric should not curl on the edge and no ripples should be visible between wire rolls. </li></ul></ul><ul><ul><li>The forming fabric design should ensure good retention of fines and fillers in the web. </li></ul></ul>
  30. 30. EXPECTATIONS FROM CLOTHING SUPPLIERS <ul><li>Forming Fabric:(contd.) </li></ul><ul><ul><li>The surface of fabric should be smooth to minimize fabric marking resulting from the knuckles of the yarns. </li></ul></ul><ul><ul><li>The fabric should retain its drainage characteristics throughout life span. </li></ul></ul>
  31. 31. EXPECTATIONS FROM CLOTHING SUPPLIERS <ul><li>Press Felts: </li></ul><ul><ul><li>Requisite felt compaction should be over within 8 to 12 hours. </li></ul></ul><ul><ul><li>In order to maintain target dryness off-press throughout span of felt life, felts should stay open and not choke after 2 to 3 weeks. </li></ul></ul><ul><ul><li>The wear of felt surface should be even. </li></ul></ul><ul><ul><li>Fiber shredding from felt should be minimum. </li></ul></ul><ul><ul><li>Felt edges should be properly treated to ensure trouble-free guiding. </li></ul></ul>
  32. 32. EXPECTATIONS FROM CLOTHING SUPPLIERS <ul><li>Dryer Screens: </li></ul><ul><ul><li>The screen design should ensure dimensional stability and minimal choking. </li></ul></ul><ul><ul><li>The screen should remain flat throughout its life span. </li></ul></ul><ul><ul><li>There should not be any marking on paper. </li></ul></ul><ul><ul><li>The screen air permeability to be maintained uniform across the width throughout the life span. </li></ul></ul><ul><ul><li>Good edge sealing should be ensured to avoid breaks due to loose strings and guiding issues. </li></ul></ul><ul><ul><li>Post dryer screen seam should hydrolysis resistant to avoid failure of seam. </li></ul></ul>
  33. 33. CONCLUSIONS <ul><li>Certainly, we see distinct improvements in quality of indigenous clothing manufacturers. </li></ul><ul><li>With constant interaction and follow-up, we are confident that indigenous manufacturers will be able to meet the requirements of paper makers and help them in producing quality paper at competitive cost. </li></ul>
  34. 34. THANKS to <ul><li>The Management of M/s Seshasayee Paper & Boards Limited for providing co-operation and guidance. </li></ul><ul><li>The suppliers who cooperating with us to manufacture quality paper </li></ul><ul><li>IPPTA for providing the opportunity to share the experience </li></ul><ul><li>The Audience for sharing the valuable time . </li></ul>

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