Transcript PRINTING OF POLYESTER

PRINTING OF POLYESTER
• DYE CLASS : DISPERSE
METHODS OF DYE FIXATION
• ATMOSPHERIC STEAMING
• PRESSURE STEAMIG
• DRY HEAT (THERMOSOL)
• HIGH TEMPERATURE STEAMING
THICKENER CHOICE
• HIGH SOLID CONTENT THICKENER IS PREFERRED
ESPECIALLY WHEN PRINTS ARE FIXED BYSTEAMING
• THE THICKENER FILM SHOULD ADHARE WELL AND PRODUCE
AN ELASTIC FILM TO PREVENT CRACKING AND FLAKING OFF
• LOW SOLID CONTENT THICKENER GIVE BETTER COLOUR
YIELD IN THERMOSOL PROCESS
• MIXTURE OF NATURAL THICKENER AND EMULSION
THICKENER IS USEFUL SINCE MINERL OIL GIVES WETTING OF
HYDROPHOBIC POLYESTER FABRIC. THE MIXED THICKENER
INCREASE LEVELNESS AND DYE PENETRATION IN THE FIBRE
• THE THICKENER FILM SHOULD EASILY BE REMOVED DURING
WASHING OPERATION
• MODIFIED GUAR GUM (INDALCA AGBV) IS WIDELY USED
PRINT PASTE COMPOSITION
DISPERSE DYE
20-50 PARTS
DISPERSING AGENT 20 PARTS
WATER
150 PARTS
SODIUM CHLORATE 5 PARTS
THICKENER PASTE TO MAKE 1000 PARTS
• SODIUM CHLORATE (MILD OXIDIZING AGENT)
PROTECT THE BRIGHTNESS OF PRINTS AGAINST
ANY POSSIBLE REDUCTION OF DYESTUFF UNDER
PROLONGED STEAMING CONDITIONS
SEQUENCE
PRINT > DRY > FIXATION > WASH > SOAP (TEMP NOT
TO EXCEED 600 C )> WASH > DRY
DYE FIXATION
• PRESSURE STEAMING AT 25 PSI, 1300 C FOR
30-45 MIN.
• HIGH TEMPERATURE STEAMING (SUPER
HEATED) AT 170-1800 C FOR 5-7 MIN.
• HOT AIR (THERMOSOL) AT 190-2000 C FOR
45-60 SEC.
AFTER TREATMENT
• COLD WATER RINSE > HOT WATER RISNSE
> SOAPING 600 C > HOT AND COLD WATER
RINSE