Pad Printing Technology

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Pad printing technology

Pad printing technology

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  • 1. Kinnari Printing Technologies Private Limited
  • 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. 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. 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. Pad Printing Process Path of pad 0 Pad Cup Image areaProduct Plate Pad printing process - closed cup
  • 6. Pad Printing Process Path of pad 0 Pad Image areaProduct Plate Pad printing process - Open inkwell
  • 7. Pad Printing System1. Open inking system 2. Closed cup
  • 8. Open inking system
  • 9. Open inking system
  • 10. Open inking system 1 Pad Spatula Doctor Blade Etched Plate Product Ink WellStarting position - ink roller floods the etched plate
  • 11. Open inking system 2 Etched PlateProduct Ink Well Doctor blade cleans the etched plate Leaving ink in the etched portion
  • 12. Open inking system 3 Etched PlateProduct Ink Well Pad stroke on the plate
  • 13. Open inking system 4 Etched PlateProduct Ink Well Pad picks up the Ink from the etched plate
  • 14. Open inking system 5 Etched PlateProduct Ink Well Pad carriage - pad moves forward
  • 15. Open inking system 6 Etched PlateProduct Ink Well Pad comes down on the product And prints on it
  • 16. Open inking system 7 Etched Plate Product Ink WellPad deposits the ink on the product and moves upward
  • 17. Closed cup
  • 18. Closed cup
  • 19. Closed cup 1 Etched PlateProduct Starting position - flooding
  • 20. Closed cup 2 Etched PlateProduct Ink cup and pad moves backward
  • 21. Closed cup 3 Etched PlateProduct Pad stroke on the plate
  • 22. Closed cup 4 Etched PlateProduct Pad moves upward
  • 23. Closed cup 5 Etched PlateProduct Pad moves forward
  • 24. Closed cup 6 Etched PlateProduct Pad stroke on the product
  • 25. Closed cup 7 Etched PlateProduct Pad deposits the ink and moves upward
  • 26. Closed cup 8 Etched PlateProduct Pad returns to its original position
  • 27. INFLUENTIAL COMPONENTS• Plates• Pads• Inks
  • 28. Pads• Solid mass of silicon rubber• Tapered and sloped – Influences print quality – Ink pickup & transfer• Surface tension• Usage• Life
  • 29. Pads• Shapes• Sizes• Hardness• Selection
  • 30. Pad Shape
  • 31. Pad - Sizes
  • 32. PADS - HARDNESS• Defined in Shore• Influences – Print quality – life• Surface considerations• Hard pad produce very good print quality, especially onto rough surface
  • 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. ETCHED PLATES• Definition• Process• Types – Thick steel plate – Thin steel plate – Photopolymer plate
  • 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. 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. THICK STEEL PLATE• Disadvantages – can not be manufactured easily – high cost
  • 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. THIN STEEL PLATE• Advantages – Low cost – Light weight – Easy to process – Combination of screened & line motif is possible• Disadvantages – Low prints
  • 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. 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. PHOTOPOLYMER PLATE• VARIABLE DEPTH – Image depth variable – All motifs – Screening is necessary – Life > 10,000 to 20,000 prints
  • 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. INKS• Higher pigmentation• Faster drying than screen printing• Chemical structure comparable with basic screen printing inks
  • 45. INKS• Binders – Adhesion, gloss & chemical resistance• Pigments – Colour & opacity• Additives – Drying behavior, printability & adhesiveness• Solvents – Tuning the flow, viscosity & opacity
  • 46. INKS• Single component• Double component• Baking inks
  • 47. Factors that affect Print Quality
  • 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. 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. FOR ANY ASSISTANCERELATED TO PAD PRINTING WELCOME TOTHE HOUSE OF KINNARIS