Release coats presentation-pstc

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Release coats presentation-pstc

  1. 1. Release Coats by Jimmy Lampley April, 08
  2. 2. Definition of Release Coat What is a “release coat?”…..A coat/coating that will relieve, liberate, release, or free (as from restraint) when desired/ required.
  3. 3. Release Coat Schematic Release Coat Substrate: Treated(Corona/chemical/primer) Roll of tape Adhesive
  4. 4. Types of Adhesive Hot melt Natural Rubber SIS, SBS Acrylate Others
  5. 5. Substrates Films: PE, PP, PET, PVC, Acetate, Perforated PE, Nonwoven PET Paper Foil Cloth: Plain, PE coated
  6. 6. Release Coats Types Silicone Non-silicone
  7. 7. Non-Silicone WATER SOLVENT Polyurethane PVODC Urethane-Acrylic PVSC Fluoro-polymer Polyethylenimine PET/acrylic Octadecyl Carbamate Vinylacetate/Acrylic (PEIODC) Polysaccharide
  8. 8. Types of Release Coat Type Acrylate Carbamate Silicone Release 1.0-1.5N/c 0.1-0.7N/c 0.01-0.1N/c Level 9-21 oz/in 1-6.5 oz/in 0.1-1 oz/in Chemical Fluorochemical PVODC Silicone Name
  9. 9. Types of Application Engraved Cylinder (rotogravure) Meyer Rod Reverse Doctor Blade Flexo Need treatment (corona/chemical/primer)
  10. 10. Curing/Drying Must dry web of solvent or water Reach a temperature to remove fully the solvent or water Most release coats must also reach a specific temperature to set, or film form Web temperature/not air temperature Assure the drying oven is free of obstructions
  11. 11. Film Forming Temperatures Release Coat Temp., C Temp., F Polyurethane 100 212 Ure-Acrylic Dry of water Dry of water PET/Acrylic 100 212 Vinylacetate/acrylic 145 300 Polysaccharid Dry of water Dry of water
  12. 12. Film Forming Temperatures Release Coat Temp., C Temp., F Fluorpolymer, RA-110W 138 280 Fluorpolymer, RA-120W Dry of water Dry of water PVODC 80-92 176-196 PVSC >80 >176 PEIODC Approx. 90 Approx. 190
  13. 13. General Properties of Release Coats Liquid vs Powder Water-blended vs Solvent-blended A specific level of release, i.e. N/cm or Oz/in Any FDA requirements Long shelf life Aging at elevated temperature & humidity
  14. 14. Chemistries PVODC PVSC PEIODC
  15. 15. Carbamate Release Coat Chemistry OH CH2–CH–CH2–CH n CH2–CH + C18H35N=C=O O –C–N–C18H35 OH n O H H Polyvinyl Octadecyl Alcohol Isocyanate Polyvinyl Octadecyl Carbamate
  16. 16. Carbamate Release Coat Chemistry OH CH2–CH–CH2–CH n CH2–CH C18H37N=C=O + O –C–N–C18/16H35 OH n C16H37N=C=O O H H Polyvinyl Octadecyl Isocyanate Alcohol Hexadecylisocyanate Polyvinyl Stearyl Carbamate
  17. 17. Carbamate Release Coat Chemistry [H2N-(CH2–CH2N)x -(CH2CH2NH)y] CH2CH2NH2 (CH2-CH2N)n Poly-Ethylenimine + C18H37N=C=O (C19H37NOC2H5N)X Pyridine Polyethylenimine Octadecyl Isocyanate Octadecyl Carbamate
  18. 18. Film Forming Temp Performance Differences Anchorage Melt Point Solubility PEIODC PVODC PVSC
  19. 19. Film Forming Temp Performance Differences Anchorage Melt Point Solubility PEIODC PVODC PVSC
  20. 20. Temperature Cloud Point vs. Solvent 0.3 0.5 0.7 1 1.5 Release Coat Solution % Solids 100% Toluene 15% Toluene/85% Heptane
  21. 21. Release Coat Weight vs.% Maximum Release Proper Film Forming Temperature Reached 100% % Maximum Release 80% 60% 40% 20% 0% 0.1 0.2 0.5 1 1.5 2 3 % Solids Release Coat
  22. 22. Coat Weight vs. Maximum Release Proper Film Forming Temperature NOT Reached % Maximum Release 100 80 60 40 20 0 0.1 0.2 0.5 1 1.5 2 3 % Solids Release Coat
  23. 23. Release Coat Use Questions Oven Drying Capabilites (What web temp. can be obtained?) Recirculation equipment Temperature requirements Printable or not (What kinds of inks or with pencil/pen?) Foaming issues (with water based)
  24. 24. Water-Based Release Coat Preferred Emulsion Polymer system R R R R R R
  25. 25. Water-Based Release Coat Relative Release Values A ll S ilic o n e Vin yla c e t a t e / a c rylic Ure t h a n e - A c rylic A c rylic 700 600 Pull Strength Value 500 400 300 200 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Relative Amount of Release
  26. 26. Water-Based Release Coat Relative Release Values Vin yla c e t a t e / a c rylic Ure th a n e - A c rylic 700 Pull Strength Value 600 RA-130W 500 400 Escoat WFX 120 300 Escoat WPM80 200 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Relative Amount of Release

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