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The Influence of Coating Structure on Sheet-Fed Offset Ink Setting Rates

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The Influence of Coating Structure on Sheet-Fed Offset Ink Setting Rates Western Michigan University ScholarWorks at WMU Master's Theses Graduate College 8-2012 The Influence of Coating Structure on Sheet-Fed Offset Ink Setting Rates Ting Chen Follow this and additional works at: https://scholarworks.wmich.edu/masters_theses Part of the Chemical Engineering Commons Recommended Citation Chen, Ting, "The Influence of Coating Structure on Sheet-Fed Offset Ink Setting Rates" (2012). Master's Theses. 22. https://scholarworks.wmich.edu/masters_theses/22 This Masters Thesis-Open Access is brought to you for free and open access by the Graduate College at ScholarWorks at WMU. It has been accepted for inclusion in Master's Theses by an authorized administrator of ScholarWorks at WMU. For more information, please contact [email protected]. THE INFLUENCE OF COATING STRUCTURE ON SHEET-FED OFFSET INK SETTING RATES by Ting Chen A Thesis Submitted to the Faculty ofThe Graduate College in partial fulfillment ofthe requirements for the Degree ofMaster ofScience Department ofPaper Engineering, Chemical Engineering and Imaging Advisor:Margaret Joyce, Ph.D. Western Michigan University' Kalamazoo, Michigan August 2012 THE GRADUATE COLLEGE WESTERN MICHIGAN UNIVERSITY KALAMAZOO, MICHIGAN Date 06/04/2012 WE HEREBY APPROVE THE THESIS SUBMITTED BY Ting Chen ENTITLED The Influence of Coating Structure on the Sheet-fed Offset Ink Setting Rates AS PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE Master of Science DEGREE OF Paper Engineering, Chemical Engineering, and Imaging (Department) |Margaret Jo^ nesis Committee Chair Paper and Imaging Science and Engineering M1,/]/^2? (Program) Dave Smith Thesis Committee Member P.J2&. <%L^- Paul D. Fleming Thesis Committee Member APPROVED Date ^k. Oovx Dean ofThe Graduate/College THE INFLUENCE OF COATING STRUCTURE ON SHEET-FED OFFSET INK SETTING RATES Ting Chen, M.S. Western Michigan University, 2012 Much attention has been paid to the study ofquickset ink setting as a complex ink-coating interaction. Offset ink setting rates are typically measured as ink splitting forces versus time and the slope of the regression line obtained from a plot of these measured values is reported, but scant attention has been paid to the deviations from that straight line. An initial slow ink setting rate is desired to minimize back-trap mottle, carryover picking and piling and enhance ink gloss; then a faster ink setting rate during sheet delivery to the pile is desired to reduce the likelihood of ink set-off, marking and scuffing and to increase product turn around efficiency. In this work, the relationship between coating structure and the slope of the rising ink setting curve was examined. Coatings of different binder levels, binder polarity and carbonates with different particle sizes were applied to a commercial woodcontaining paper, using a cylindrical laboratory coater. The coatingstructures of the coated samples were characterized using mercury porosimetry and surface energy measurements. The Deltack force-time curves were then mapped out for each coating in time intervals small enough to detect inflections within 3s. This novel interpretationofink setting provides fresh insights into the ink setting process. Copyright by Ting Chen 2012 ACKNOWLEDGMENTS I would like to express my sincere gratitude to my thesis committee members, Dr. Margaret K. Joyce, Dr. Paul D. Fleming and Mr. Dave Smith, for their kindly advice, guidance, and assistance throughout my thesis research and beyond that. My gratitude is extended to the industrial sponsors from Paper Technology Foundation (PTF) in Western Michigan University for their financial support for my study and research. Thanks Mr. Matt Stoops for teaching and assisting me with my experiments. I also appreciate Brian Ninness, Greg Welsch, Nick Nicholas, Mark Pollock and Tom Boyle from Styron for providing both the latex samples and first set ofDeltack measurements. Finally, my deepest gratitude goes to my parents, for their love, support, and encouragement for my life and study. Ting Chen TABLE OF CONTENTS ACKNOWLEDGMENTS ii LIST OF TABLES v LIST OF FIGURES vi CHAPTER I. INTRODUCTION 1 II. REFERENCES REVIEW 4 2.1 Overview ofOffset Printing 4 2.2 Ink Formulation and Offset Inks 6 2.3 Paper Coatings 9 2.3.1 Coating Pigments 12 2.3.2 Coating Binders 12 2.3.3 Coating Additives 13 2.4 Ink Setting and Drying 13 2.5 The Influences ofInk Setting Rates on Offset Printability and Runnability 19 2.5.1 The Influences ofInk Setting Rates on Print Gloss 19 2.5.2 The Influences ofOffset Ink Setting Rate on Print Defects 22 2.6 Methods to Optimize Ink Setting and Drying 24 2.7 The Measurements of Ink Setting Rates 26 in Table ofContents—continued CHAPTER 2.7.2 The Newly Developed Instrument: Deltack Printability Tester 29 2.8 The Measurements and Modeling ofCoating Porous Structure 32 III. EXPERIMENTAL 34 3.1 Coating Formulation 34 3.2 Characterization ofBase Papers and Coated Papers 35 IV. RESULTS AND DISCUSSION 39 4.1 The Properties ofBase Papers 39 4.2 The Properties ofCoatings and Single Coated Papers 46 4.3 Statistical Analysis ofInk Tack Build Slope and Coating Failure Force 62 4.4 The Selection ofPromising Coated Papers 66 V. CONCLUSIONS 69 BIBLIOGRAPHY 71 APPENDIX 77 IV LIST OF TABLES 1. Critical properties of coatings required in different processes 11 2. The characteristic oftwo SB latexes , 34 3. Coating formulations (Dry parts) 35 4. TAPPI Standards and instruments for the paper properties measurements 36 5. Parameters used to derive the equation for permeabilitycoefficient 37 6. Thebasis weights, filler levels and thicknesses of the two base papers used 39 7. Surface energy of base papers 44 8. Deltack ink setting slope, picking force and passes to fail of base papers 46 9. The properties of coatings 47 10. The coat weights and thickness of coated papers 48 11. Minitab statistical analysis of 3-variable 2-level study of inktack build slope oncoated papers 64 12. Minitab statistical analysis of 3-variable 2-level study of coating failure force oncoated papers 66 13. The evaluation ofDeltack ink setting profiles ofall coated papers 67 • LIST OF FIGURES 1. Example of a desirable ink settingforce-time profile 3 2. Offset printing unit 5 3. Ink components and their functions 7 4. General sequence ofaddition during coating makedown 11 5. Overviewofink drying effects 13 6. A tentative illustration ofthe ink-to-paper transferring process 14 7. Differential ink absorptionon coated paper 15 8. Macro roughness and micro roughness in combination determinegloss ..20 9. Processofback-trap mottling 23 10. Vandercook presswith a Lodcel 27 11. Ink Surface Interaction Tester (ISIT) 27 12. Schematic arrangement of ISIT 28 13. Schematic ofMicro-Tackmeter 29 14. The prufbau Deltack printability tester 30 15. Brightness of base papers 40 16. 75° Glossof basepapers 40 17. PPS Roughness of basepapers(CP 1000 kPa/Sofl Backing)... 40 18. PPS porosity of base papers (CP 1000 kPa) 41 19. Permeability coefficientsofbase papers 41 20. Waterabsorbency of base papers 42 VI List ofFigures—continued 21. Methylene iodide (MI) absorbency of base papers 42 22. Contact angle of water on the base papers 43 23. Contact angleof methylene iodide (MI) on the base papers 43 24. Deltack ink settingrate profile of base paperA 45 25. Deltackink settingrate profile of basepaper D 45 26. Brightness of coated papers 49 27. 75°Glossof coated papers 50 28. PPS roughness of coated papers 50 29. Contactanglesof water on the coated papers A1-A8 51 30. Contact angles ofmethylene iodide (MI)on the coated papers Al -A8 ....51 31. Contact angles of water on the coated papers D1-D8 52 32. Contact angles of methylene iodide (MI) on thecoated papers D1-D8 ....52 33. Surface energy of coated papers 53 34. Polar components of coated papers 53 35. Permeability coefficients of coated papers 56 36. Pore size distribution in the coating pores diameter region ofcoated papers A1-A4 58 37. Pore size distribution in the coating pores diameter region ofcoated papers A5-A8 58 38. Deltack ink setting rate profileofcoated papers A1-A8 from the beginning to the maximum tackpoint 59 39. Pore size distribution in the coating pores diameter region ofcoated papers D1-D4 61 vi i List ofFigures—continued 40. Pore size distribution in the coating pores diameter region ofcoated papers D5-D8 61 41. Deltack ink setting rate profile ofcoated papers D1-D8 from the beginning to the maximum tack point 62 vn CHAPTER I INTRODUCTION Offset printing is one of the major printing processes used to print coated papers and paperboards. Itsapplication of a high tack oil-based paste inkand fountain solution make the ink setting rate on press critical to the runnability on press, especially on the coated papers. The ink setting rate, typically measured as ink splitting forces versus time, has a great effect on the runnability and printability of the offset press. An ink that sets too fast at the beginning can aggravate back-trap mottle, carryover picking, piling and reduce ink gloss, while an ink that sets too slowly will increase the likelihood of ink set-off during sheet delivery to the pile, increase the occurrence of marking and scuffing and reduce product turn around efficiency. To optimize the sheet-fed offset press, it is thereby desired to ensure a slow-to-fast ink setting rate change on this press. Although much has been done in the pressroom by the press and ink manufacturers to optimize the ink setting rates, the idea of re-engineering the paper coating or the quickset ink to provide a dramatic acceleration in ink setting rate just before sheet delivery hasnot been explored. However, a screening of commercial inks and experimental coating formulations on a Deltack printability tester indicated that some inks exhibit either a delay or a drop in tack before they rise (as tested on conventional fast setting coated stock) [1].
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