1 / 4

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

xaria
Télécharger la présentation

RESIST PRINTING UNDER REACTIVE DYES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related