Transcript ROLLER PRINTING MACHINE A

ROLLER PRINTING
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INVENTOR : JAMES BELL FROM SCOTLAND
PATENT: 1783
COMMERCIAL USE: 1785
FIRST PRODUCTION MACHINE FOR TEXTILE
PRINTING
POPULAR TILL 1985 (TWO CENTURIES)
POPULARITY DECREASED AFTER THE DISCOVERY
OF ROTORY SCREEN PRINTING MACHINE IN 1960
PRESENT POSITION: OBSOLETE.
CONTINUOUS PRINTING
PRODUCTION SPEED: 70-80 M/MIN
No. OF COLOURSIN DESIGN: 1-12
ROLLER PRINTING MACHINE
ROLLER PRINTING MACHINE
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A - HOLLOW CENTRAL DRUM
B - LAPPING
C - ENDLESS PRINTING BALNKET
D - BACK GREY
E - FABRIC TO BE PRINTED
F - ENGRAVED DESIGN ROLLER
G - FURNISHING ROLLER
H - COLOUR BOX
J - COLOUR DOCTOR
K - LINT DOCTOR
MULTI COLOUR ROLLER MACHINE
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
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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
1. COLOUR SEPARTION
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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
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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