M anual screen printing

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M anual screen printing

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

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