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M anual screen printing
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M anual screen printing

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M anual screen printing M anual screen printing Presentation Transcript

  • SCREEN PRINTING
    • MANUAL
    • AUTOMATIC FLAT BED
    • ROTARY SCREEN PRINTING
  • MANUAL SCREEN PRINTING
    • MODIFIED VERSION OF STENCIL PRINTING
    • DEVELOPED IN ENGLAND AROUNT 1830 - 1840
    • PRACTICED IN USA AROUND 1900
    • INDIA AROUND 1926
    • MOST POPULAR IN INDIA AMONGST SMALL SCALE PRINTERS
  • ESSENTIAL REQUIREMENTS
    • SCREEN PRINTING TABLE
    • TABLE TOPPED WITH JUTE FABRIC AND BACK GREY CLOTH
    • WAX TOP TABLE
    • TABLE TOPPED WITH REXIN CLOTH OR POLYESTER FILM COATED WITH STICKER ADHESIVE
    • SCREEN FRAMES
    • WOODEN
    • METAL
  • ESSENTIAL REQUIREMENTS
    • SCREEN FABRIC/BOLTING CLOTH
    • SILK
    • NYLON
    • POLYESTER
    • FABRIC MESH
    • 100X100, 140X140, 300X300 etc
    • COMMERCIAL DENOMINATION
    • NUMBERS LIKE 12, 16, 18, 25, 40 etc
  • ESSENTIAL REQUIREMENTS
    • SQUEEGEE
    • RUBBER BLADE FIXED WITH WOODEN HANDLE
    • AMOUNT OF PRINT PASTE TRANSFERRED DEPENDS ON
    • PRESSURE APPLIED
    • RUBBER HARDNESS
    • SQUEEGEE PROFILE : ROUND, SHARP
  • PREPARATION OF DESIGN SCREENS
    • SELECTION OF BOLTING CLOTH
    • NATURE OF DESIGN
    • FABRIC TO BE PRINTED
    • LOW MESH: FOR BLOTCH DESIGN AND THICK/COARSE FABRIC TO BE PRINTED
    • HIGH MESH: FOR FINE DESING AND FINE FABRIC TO BE PRINTED
    • BOLTING CLOTH FIXATION ONTO SCREEN
    • DRUM TAUT/PERFECTLY STRETCHED
    • WOODEN FRAME
    • METAL FRAME
  • DESIGN TRANSFER ONTO SCREEN
    • DIRECT PAINTING
    • PHOTOCHEMICAL PROCESS
    • PRINCIPLE
    • COATING OF SCREEN WITH PHOTOSENSITIVE EMULSION
    • EXPOSURE OF SCREEN IN CONTACT WITH COLOUR SEPARATION
    • EXPOSURE TO LIGHT
    • INSOLUBILIZATION OF PHOTOSENSITIVE EMULSION ON EXPOSURE TO LIGHT
    • WASHING SOLUBLE EMULSION
  • PHOTOSENSITIVE EMULSION
    • POLYVINYL ALCOHOL 10% 900 gm
    • POLYVINYL ACETATE 100 gm
    • AMM. DICHROMATE 10 gm
  • STEPS INVOLVED
    • COLOUR SEPARTION
    • SEPARTE SCREEN FOR EACH COLOUR IN DESIGN
    • MASTER DESIGN
    • DESIGN REPEAT
    • DEIGN FITTING MARKS
    • MANUAL COLOUR SEPARATION
    • CAD COLOUR SEPARATION
    • EACH COLOUR SEPARTION IN BLACK INK.
  • STEPS INVOLVED
    • 2. FIXING THE BOLTING CLOTH ON FRAME
    • 3. WASHING WITH DETERGENT
    • 4. DRYING
    • 5. COATING WITH PHOTOSENSITIVE EMULSION
    • 6. DRYING IN DARK
    • 7. TRANSFER OF DESIGN
    • 8. REMOVAL OF UNEXPOSED PHOTOSENSITIVE EMULSION BY WASHING
    • 9. HARDENING WITH SYNTHETIC LAQUER
    • 10. RETOUCHING FOR PIN HOLES
    • 11. READY TO USE