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General composition of print paste

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  • 1. GENERAL COMPOSITION OF PRINT PASTE
    • DYESTUFF
    • WATER
    • THICKENER
    • HYDROTROPIC AGENTS SUCH AS
    • SOLVENTS(Diethylene glycol)
    • HUMECTANT (Urea)
    • MILD OXIDIZING AENT
    • DEFOAMING AGENT
  • 2. DYESTUFF, THICKENER
    • DYE CLASS DEPENDS ON THE CLASS OF FIBRE TO BE PRINTED
    • THICKENER
    • HIGH MOL. Wt. NATURAL (STARCH), MODIFIED NATURAL (CMC, GUAR GUM), SYNTHETIC (POLYACRYLATES) POLYMERS WHICH WHEN DISSOLVED OR SWOLLEN IN WATER GIVE HIGHLY VISCOUS SOLUTION OR GEL
  • 3. ESSENTIAL QUALITIES OF THICKENER
    • COMPATIBILITY WITH OTHER INGREDIENTS OF PRINT PASTE
    • PRINT PASTE ON PRINTING SHOULD SINK ON FABRIC AS QUICKLY AS POSSIBLE. THIS IS DESIRABLE FOR WET-ON-WET PRINTING
    • FREE FROM INSOLUBLE IMPURITIED TO AVOID SCREEN CHOCKING AND UNEVEN OUTLINE PRINITNG
    • MUST HAVE SATISFACTORY ADHESION TO FABRIC AFTER PRINTING AND DRYING. THE THICKENER FILM SHOULD NOT BE BRITTLE SO AS TO FLAKE OFF FROM THE FABRIC SURFACE
    • THE THICKENER PASTE SHOULD BE SHEAR THINNING AND THIXOTROPIC
    • NO AFFINITY TOWARDS DYE AND OTHER CHEMICALS IN PRINT PASTE
    • DURING FIXATION THE THICKENER FILM SHOULD EASILY LEAVE THE DYE AND ALLOW ITS PENETRATION INTO FIBRE
    • SHOULD BE EASILY REMOVED FROM THE FABRIC DURING WASHING
  • 4. HYDROTROPIC AGENTS
    • WATER SOLUBLE COMPOUNDS
    • IINCREASE WATER SOLUBILITY OF OTHER COMPOUNDS
    • UREA, DIETHYLENE GLYCOL, GLYCERINE ETC.
    • MULTIPLE FUNCTION
    • HYGROSCOPIC AGENTS
    • DYE DISSSOLVING ASSISTANTS
    • SOLVENTS
    • IMPROVE DYE SOLUBILITY
    • PREVENT DYE AGGREGATION IN PRINT PASTE
    • FACILITATE DYE DIFFUSION
    • IMPROVE COLOUR YIELD
    • Deg, THIODIETHYLENE GLYCOL.
  • 5. HYGROSCOPIC AGENTS
    • FACILITATE STEAM CONDENSATION AT PRINTED PORTION DURING STEAM FIXATION
    • ESSENTIAL FOR DYE FIXATION
    • IF MORE THAN OPTIMUM, LOSS IN PRINT SHARPNESS DUE TO EXCESSIVE STEAM CONDENSATION
  • 6. pH CONTROLLING AGENTS
    • PROVIDE ACID OR ALKALINE pH for dye FIXATION
    • ACID pH ; NON-VOLATILE ORGANIC ACIDS
    • CITRIC, TARTARIC ACID OR
    • ACID LIBERATING AGENT (NH4)2SO4
    • ALKALINE pH Na2CO3 OR NaHCO3
  • 7. REDUCTION PROTECTION
    • CERTAIN DYES PARTICULARLY THOSE CONTAINING AZO GROUP ARE SUSCEPTIBLE TO REDUCING INFLUENCE OF THICKENER AND OR FIBRE (CELLULOSE) DURING STEAMING
    • 5-10 g?kg NaClO3 IN CASE OF SYNTHETIC FIBRE PRINTING
    • 10 g/kg m-NITROBENZENE SULPHONIC ACID FOR REACTIVE DYES ON COTTON
  • 8. DEFOAMING AGNET
    • FOAM GENERATION
    • DURING HIGH SPEED PRINTING (ROTARY)
    • IN PRESENCE OF DYES AND CHEMICALS HAVING SURFACE ACTIVITY
    • SPECKY PRINTS
    • SILICONE DEFOAMER
  • 9. MECHANISM OF DYE FIXATION
    • STEAMING, MOST COMMON METHOD FOR DYE FIXATION
    • SEQUENCE
    • PRINT > DRY > STEAM > WASH > SOAP > WASH
    • PRINT STAGE
    • DYE, OTHER CHEMICALS AND THICKENER IN SOLUTION FORM ON FABRIC
    • DRYING STAGE
    • WATER EVAPORATION
    • DRY THICKENER FILM (CONTINUOUS)
    • INSOLUBLE DYE AND OTHER CHEMICALS EMBEDED IN DRY THICKENER FILM
    • STEAMING STAGE
    • HIGHER WATER CONDENSATION AT THE PRINTIED PORTION
    • SWELLING OF THICKENER FILM
    • BREAKING OF FILM CONTINUITY
  • 10.
    • DISSOLUTION OF DYES AND CHEMCALS IN SWOLLEN FILM
    • FIBRE SWELLING, DISSOLUTION OF DYE AND OTHER CHEMICALS.
    • FORMATION OF HIGH DYE CONCENTRATION WITHIN THICKENER FILM
    • DIFFUSION OF DYE AND OTHER CHEMCALS IN FIBRE
    • DYE-FIBRE INTERACTION
    • RETENTION OF DYE INTO FIBRE (DYE FIXATION)
    • WASHING OFF UNFIXED DYE, OTHER CHEMICALS AND THICKENER

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