GENERAL COMPOSITION OF PRINT PASTE <ul><li>DYESTUFF </li></ul><ul><li>WATER </li></ul><ul><li>THICKENER </li></ul><ul><li>...
DYESTUFF, THICKENER <ul><li>DYE CLASS DEPENDS ON THE CLASS OF FIBRE TO BE PRINTED </li></ul><ul><li>THICKENER </li></ul><u...
ESSENTIAL QUALITIES OF THICKENER <ul><li>COMPATIBILITY WITH OTHER INGREDIENTS OF PRINT PASTE </li></ul><ul><li>PRINT PASTE...
HYDROTROPIC AGENTS <ul><li>WATER SOLUBLE COMPOUNDS </li></ul><ul><li>IINCREASE WATER SOLUBILITY OF OTHER COMPOUNDS </li></...
HYGROSCOPIC AGENTS <ul><li>FACILITATE STEAM CONDENSATION AT PRINTED PORTION DURING STEAM FIXATION </li></ul><ul><li>ESSENT...
pH CONTROLLING AGENTS <ul><li>PROVIDE ACID OR ALKALINE pH for dye FIXATION </li></ul><ul><li>ACID pH ; NON-VOLATILE ORGANI...
REDUCTION PROTECTION <ul><li>CERTAIN DYES PARTICULARLY THOSE CONTAINING AZO GROUP ARE SUSCEPTIBLE TO REDUCING INFLUENCE OF...
DEFOAMING AGNET <ul><li>FOAM GENERATION </li></ul><ul><li>DURING HIGH SPEED PRINTING (ROTARY) </li></ul><ul><li>IN PRESENC...
MECHANISM OF DYE FIXATION <ul><li>STEAMING, MOST COMMON METHOD FOR DYE FIXATION </li></ul><ul><li>SEQUENCE </li></ul><ul><...
<ul><li>DISSOLUTION OF DYES AND CHEMCALS IN SWOLLEN FILM </li></ul><ul><li>FIBRE SWELLING, DISSOLUTION OF DYE AND OTHER CH...
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General composition of print paste

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General composition of print paste

  1. 1. GENERAL COMPOSITION OF PRINT PASTE <ul><li>DYESTUFF </li></ul><ul><li>WATER </li></ul><ul><li>THICKENER </li></ul><ul><li>HYDROTROPIC AGENTS SUCH AS </li></ul><ul><li>SOLVENTS(Diethylene glycol) </li></ul><ul><li>HUMECTANT (Urea) </li></ul><ul><li>MILD OXIDIZING AENT </li></ul><ul><li>DEFOAMING AGENT </li></ul>
  2. 2. DYESTUFF, THICKENER <ul><li>DYE CLASS DEPENDS ON THE CLASS OF FIBRE TO BE PRINTED </li></ul><ul><li>THICKENER </li></ul><ul><li>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 </li></ul>
  3. 3. ESSENTIAL QUALITIES OF THICKENER <ul><li>COMPATIBILITY WITH OTHER INGREDIENTS OF PRINT PASTE </li></ul><ul><li>PRINT PASTE ON PRINTING SHOULD SINK ON FABRIC AS QUICKLY AS POSSIBLE. THIS IS DESIRABLE FOR WET-ON-WET PRINTING </li></ul><ul><li>FREE FROM INSOLUBLE IMPURITIED TO AVOID SCREEN CHOCKING AND UNEVEN OUTLINE PRINITNG </li></ul><ul><li>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 </li></ul><ul><li>THE THICKENER PASTE SHOULD BE SHEAR THINNING AND THIXOTROPIC </li></ul><ul><li>NO AFFINITY TOWARDS DYE AND OTHER CHEMICALS IN PRINT PASTE </li></ul><ul><li>DURING FIXATION THE THICKENER FILM SHOULD EASILY LEAVE THE DYE AND ALLOW ITS PENETRATION INTO FIBRE </li></ul><ul><li>SHOULD BE EASILY REMOVED FROM THE FABRIC DURING WASHING </li></ul>
  4. 4. HYDROTROPIC AGENTS <ul><li>WATER SOLUBLE COMPOUNDS </li></ul><ul><li>IINCREASE WATER SOLUBILITY OF OTHER COMPOUNDS </li></ul><ul><li>UREA, DIETHYLENE GLYCOL, GLYCERINE ETC. </li></ul><ul><li>MULTIPLE FUNCTION </li></ul><ul><li>HYGROSCOPIC AGENTS </li></ul><ul><li>DYE DISSSOLVING ASSISTANTS </li></ul><ul><li>SOLVENTS </li></ul><ul><li>IMPROVE DYE SOLUBILITY </li></ul><ul><li>PREVENT DYE AGGREGATION IN PRINT PASTE </li></ul><ul><li>FACILITATE DYE DIFFUSION </li></ul><ul><li>IMPROVE COLOUR YIELD </li></ul><ul><li>Deg, THIODIETHYLENE GLYCOL. </li></ul>
  5. 5. HYGROSCOPIC AGENTS <ul><li>FACILITATE STEAM CONDENSATION AT PRINTED PORTION DURING STEAM FIXATION </li></ul><ul><li>ESSENTIAL FOR DYE FIXATION </li></ul><ul><li>IF MORE THAN OPTIMUM, LOSS IN PRINT SHARPNESS DUE TO EXCESSIVE STEAM CONDENSATION </li></ul>
  6. 6. pH CONTROLLING AGENTS <ul><li>PROVIDE ACID OR ALKALINE pH for dye FIXATION </li></ul><ul><li>ACID pH ; NON-VOLATILE ORGANIC ACIDS </li></ul><ul><li> CITRIC, TARTARIC ACID OR </li></ul><ul><li> ACID LIBERATING AGENT (NH4)2SO4 </li></ul><ul><li>ALKALINE pH Na2CO3 OR NaHCO3 </li></ul><ul><li> </li></ul>
  7. 7. REDUCTION PROTECTION <ul><li>CERTAIN DYES PARTICULARLY THOSE CONTAINING AZO GROUP ARE SUSCEPTIBLE TO REDUCING INFLUENCE OF THICKENER AND OR FIBRE (CELLULOSE) DURING STEAMING </li></ul><ul><li>5-10 g?kg NaClO3 IN CASE OF SYNTHETIC FIBRE PRINTING </li></ul><ul><li>10 g/kg m-NITROBENZENE SULPHONIC ACID FOR REACTIVE DYES ON COTTON </li></ul>
  8. 8. DEFOAMING AGNET <ul><li>FOAM GENERATION </li></ul><ul><li>DURING HIGH SPEED PRINTING (ROTARY) </li></ul><ul><li>IN PRESENCE OF DYES AND CHEMICALS HAVING SURFACE ACTIVITY </li></ul><ul><li>SPECKY PRINTS </li></ul><ul><li>SILICONE DEFOAMER </li></ul>
  9. 9. MECHANISM OF DYE FIXATION <ul><li>STEAMING, MOST COMMON METHOD FOR DYE FIXATION </li></ul><ul><li>SEQUENCE </li></ul><ul><li>PRINT > DRY > STEAM > WASH > SOAP > WASH </li></ul><ul><li>PRINT STAGE </li></ul><ul><li>DYE, OTHER CHEMICALS AND THICKENER IN SOLUTION FORM ON FABRIC </li></ul><ul><li>DRYING STAGE </li></ul><ul><li>WATER EVAPORATION </li></ul><ul><li>DRY THICKENER FILM (CONTINUOUS) </li></ul><ul><li>INSOLUBLE DYE AND OTHER CHEMICALS EMBEDED IN DRY THICKENER FILM </li></ul><ul><li>STEAMING STAGE </li></ul><ul><li>HIGHER WATER CONDENSATION AT THE PRINTIED PORTION </li></ul><ul><li>SWELLING OF THICKENER FILM </li></ul><ul><li>BREAKING OF FILM CONTINUITY </li></ul>
  10. 10. <ul><li>DISSOLUTION OF DYES AND CHEMCALS IN SWOLLEN FILM </li></ul><ul><li>FIBRE SWELLING, DISSOLUTION OF DYE AND OTHER CHEMICALS. </li></ul><ul><li>FORMATION OF HIGH DYE CONCENTRATION WITHIN THICKENER FILM </li></ul><ul><li>DIFFUSION OF DYE AND OTHER CHEMCALS IN FIBRE </li></ul><ul><li>DYE-FIBRE INTERACTION </li></ul><ul><li>RETENTION OF DYE INTO FIBRE (DYE FIXATION) </li></ul><ul><li>WASHING OFF UNFIXED DYE, OTHER CHEMICALS AND THICKENER </li></ul>

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