Pad Printing Technology

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Pad printing technology

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Pad Printing Technology

  1. 1. Kinnari Printing Technologies Private Limited
  2. 2. Pad Printing Technology• Pad Printing process• Advantages of Pad printing technology• Types of Machines – Open ink well machines – Closed cup machines• Influencing components – Pads – Etched Plate – Ink
  3. 3. Pad Printing Process Pad printing is indirect printing process . It is combination of Gravure and Off-set printing process. The plate is like gravure cylinder. Image transfer is done like off-set printing process. Solid silicon rubber called as pad picks up the image from the plate and then transferred on the product .
  4. 4. Pad Printing Advantages• prints on any convex, concave & irregular surfaces• gives sharp print quality• perfect registration – multicolor printing• high processing speed• low ink consumption• small space required• easy to operate
  5. 5. Pad Printing Process Path of pad 0 Pad Cup Image areaProduct Plate Pad printing process - closed cup
  6. 6. Pad Printing Process Path of pad 0 Pad Image areaProduct Plate Pad printing process - Open inkwell
  7. 7. Pad Printing System1. Open inking system 2. Closed cup
  8. 8. Open inking system
  9. 9. Open inking system
  10. 10. Open inking system 1 Pad Spatula Doctor Blade Etched Plate Product Ink WellStarting position - ink roller floods the etched plate
  11. 11. Open inking system 2 Etched PlateProduct Ink Well Doctor blade cleans the etched plate Leaving ink in the etched portion
  12. 12. Open inking system 3 Etched PlateProduct Ink Well Pad stroke on the plate
  13. 13. Open inking system 4 Etched PlateProduct Ink Well Pad picks up the Ink from the etched plate
  14. 14. Open inking system 5 Etched PlateProduct Ink Well Pad carriage - pad moves forward
  15. 15. Open inking system 6 Etched PlateProduct Ink Well Pad comes down on the product And prints on it
  16. 16. Open inking system 7 Etched Plate Product Ink WellPad deposits the ink on the product and moves upward
  17. 17. Closed cup
  18. 18. Closed cup
  19. 19. Closed cup 1 Etched PlateProduct Starting position - flooding
  20. 20. Closed cup 2 Etched PlateProduct Ink cup and pad moves backward
  21. 21. Closed cup 3 Etched PlateProduct Pad stroke on the plate
  22. 22. Closed cup 4 Etched PlateProduct Pad moves upward
  23. 23. Closed cup 5 Etched PlateProduct Pad moves forward
  24. 24. Closed cup 6 Etched PlateProduct Pad stroke on the product
  25. 25. Closed cup 7 Etched PlateProduct Pad deposits the ink and moves upward
  26. 26. Closed cup 8 Etched PlateProduct Pad returns to its original position
  27. 27. INFLUENTIAL COMPONENTS• Plates• Pads• Inks
  28. 28. Pads• Solid mass of silicon rubber• Tapered and sloped – Influences print quality – Ink pickup & transfer• Surface tension• Usage• Life
  29. 29. Pads• Shapes• Sizes• Hardness• Selection
  30. 30. Pad Shape
  31. 31. Pad - Sizes
  32. 32. PADS - HARDNESS• Defined in Shore• Influences – Print quality – life• Surface considerations• Hard pad produce very good print quality, especially onto rough surface
  33. 33. PADS - SELECTION• Product shape• Substrate• print area• machine capacityThe thumb rule for achieving the topquality printing is tochoose a hard pointed printing pad withlargest possible volume.
  34. 34. ETCHED PLATES• Definition• Process• Types – Thick steel plate – Thin steel plate – Photopolymer plate
  35. 35. THICK STEEL PLATE• High quality alloy steel• Hardened, ground and lapped surface• hardness 58 – 65 HRC• Plate thickness > 10 mm• Etch depth > 18 – 40 µ• Life > 5 – 10 lacs
  36. 36. THICK STEEL PLATE• Advantages – Contour accuracy – Stepped etching – application of screen possible – High mechanical resistance – very high stability (life) – combination of screened and line motif is possible
  37. 37. THICK STEEL PLATE• Disadvantages – can not be manufactured easily – high cost
  38. 38. THIN STEEL PLATE• 0.5 to 1 mm thin flexible plate• Held by magnets• Processing same like thick plate• Hardness > 45 to 50 HRC• Etched depth > 18 to 40 µ• Life > Approx. 20,000 to 50,000 prints
  39. 39. THIN STEEL PLATE• Advantages – Low cost – Light weight – Easy to process – Combination of screened & line motif is possible• Disadvantages – Low prints
  40. 40. PHOTOPOLYMER PLATE• Thin presensitized plastic plate backed by tin sheet• Easy & fast to process• Small run production• Less life – dependent on machine adjustment – Doctor blade which is harder than plate• Two types > Water & alcohol washable• Two types > Fix depth & variable depth
  41. 41. PHOTOPOLYMER PLATE• FIX DEPTH – Always 25 to 27 µ – Suitable for fine & small motifs – Screening not possible – Life > 5,000 to 20,000 prints
  42. 42. PHOTOPOLYMER PLATE• VARIABLE DEPTH – Image depth variable – All motifs – Screening is necessary – Life > 10,000 to 20,000 prints
  43. 43. PHOTOPOLYMER PLATE• ADVANTAGES – Easy & faster to process – Low cost – User can process in-house – Coated plates available – Combination of screened & line motif possible• DISADVANTAGES – Low prints
  44. 44. INKS• Higher pigmentation• Faster drying than screen printing• Chemical structure comparable with basic screen printing inks
  45. 45. INKS• Binders – Adhesion, gloss & chemical resistance• Pigments – Colour & opacity• Additives – Drying behavior, printability & adhesiveness• Solvents – Tuning the flow, viscosity & opacity
  46. 46. INKS• Single component• Double component• Baking inks
  47. 47. Factors that affect Print Quality
  48. 48. PRINT QUALITY• Speed of Pad stroke on plate• Speed of Pad stroke product• Evaporation of thinner from the ink in the etched portion of plate and ink film on pad• Type of inks used• Type of design to be printed• Pad shape, size, and hardness• Pad in use - Quality of pad , pad - new or old• Etching depth• Drying of the inks on the parts
  49. 49. PRINT QUALITY• Components cleanliness• Air circulation / flow• Room temperature• Type of quality of thinner used• Viscosity of inks• Air humidity• Speed of pad carriage - forward and backward• Product rigidity, shape and size• Operators skills• Machine maintenance• Print area
  50. 50. FOR ANY ASSISTANCERELATED TO PAD PRINTING WELCOME TOTHE HOUSE OF KINNARIS

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