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RESIST PRINTING UNDER REACTIVE DYES

RESIST PRINTING UNDER REACTIVE DYES. REIST PRINTING: PREVENTION OF DYE FIXATION AT THE PRINTED PORTION WHITE RESIST: WHITE PRINT AGAINST COLOURED BACKGROUND COLOURED RESIST: COLOUR PRINT AGAINST COLOUR BACKGROUND PRINCIPLE REACTIVE DYES FIXED ON COTTON UNDER ALKALINE CONDITIONS

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RESIST PRINTING UNDER REACTIVE DYES

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  1. RESIST PRINTING UNDER REACTIVE DYES REIST PRINTING: PREVENTION OF DYEFIXATION AT THE PRINTED PORTION WHITE RESIST: WHITE PRINT AGAINST COLOURED BACKGROUND COLOURED RESIST: COLOUR PRINT AGAINST COLOUR BACKGROUND PRINCIPLE • REACTIVE DYES FIXED ON COTTON UNDER ALKALINE CONDITIONS • DYE FIXATION PREVENTED UNDER ACIDIC CONDITIONS SEQUENCE: PRINT WITH RESISTING AENT > DRY > NIP PAD WITH DYE + ALKALI >DRY > STEAM > WASH > SOAP > WASH > DRY

  2. CHOICE OF ACID • INORGANIC ACID SUCH AS HCl NOT SUITABLE DUE TO DANGER OF FIBRE DEGRADATION DURING STEAMING • VOLATILE ORGANIC ACID LIKE ACETIC ACID NOT SUITABLE • NON-VOLATILE ORGANIC ACID LIKE CITRIC ACID, TARTARIC ACID SUITABLE THICKENER: SHOULD BE STABLE TO ACID e.g. MODIFIED GUAR GUM (INDALCA AGBV)

  3. PRINT PASTE COMPOSITION CITRIC ACID 50 PARTS WATER 50 ml THICKENER PASTE 900 PARTS TOTAL 1000 PARTS PRINT > DRY PAD LIQUOR COMPOSITION REACTIVE DYE 10-20 g/l RESIST SALT 10 g/l SOD. BICRBONATE 10-20 g/l NIP PAD > DRY > STEAM FOR 10-15 MIN. > WASH > SOAP > WASH > DRY

  4. COLOURED RESIST COLOURED PRINT AGAINST COLOUR BACKGROUND PRINCIPLE: • INCORPORATE DYE/PIGMENT IN RESIST PASTE WHICH CAN BE FIXED UNDER ACIDIC CONDITION • SIMULTANEOUS FIXATION OF GROUND COLOUR AND PRINT COLOUR • PIGMENT ALONG WITH BINDER MOST SUITABLE PRINT PASTE COMPOSITION PIGMENT COLOUR 20-30 PARTS BINDER 100 PARTS EMULSION THICKENER 850 PARTS CITRIC ACID 50 PARTS TOTAL 1000 PARTS PRINT > DRY > NIP PAD WITH REACTIVE DYE + ALKALI > DRY > STEAM > WASH > SOAP > WASH > DRY

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