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General composition of print paste
 

General composition of print paste

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    General composition of print paste General composition of print paste Presentation Transcript

    • GENERAL COMPOSITION OF PRINT PASTE
      • DYESTUFF
      • WATER
      • THICKENER
      • HYDROTROPIC AGENTS SUCH AS
      • SOLVENTS(Diethylene glycol)
      • HUMECTANT (Urea)
      • MILD OXIDIZING AENT
      • DEFOAMING AGENT
    • 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
    • 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
    • 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.
    • 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
    • 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
    • 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
    • DEFOAMING AGNET
      • FOAM GENERATION
      • DURING HIGH SPEED PRINTING (ROTARY)
      • IN PRESENCE OF DYES AND CHEMICALS HAVING SURFACE ACTIVITY
      • SPECKY PRINTS
      • SILICONE DEFOAMER
    • 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
      • 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