Dyed and Pigments

DYES AND PIGMENTS:-

• COLORANTS ARE USED IN TEXTILES TO GIVE COLOUR TO TEXTILES.
• THESE ARE CHEMICAL KNOWN AS DYES AND PIGMENTS.
• THE MOST COMMON OF THESE ARE DYES.
• THERE ARE HUNDRED OF DYES AVAILABLE FOR USE IN MANUFACTURING; THE MOST COMMONLY USED OF THESE CATEGORIES ARE:

DIRECT DYES:-

A CHEAP AND LOW COLOUR FAST DYE USED ON CELLULOSICFIBRES, (SUCH AS COTTON, FLAX, RAYON ETC); THEY OFFER A WIDE RANGE OF COLOURS, BUT THE COLOURS MAY NOT BE AS BRIGHT OR INTENSE AS DESIRED. THESE DYES MAY BE LOSE COLOUR IN WASHING AND LAUNDERING.

REACTIVE DYES:-

USED ON CELLULOSIC FIBRES (COTTON,RAYON), PROTEIN FIBRES (WOOL,SILK) AND NYLON. THESE DYES OFFER GOOD COLOUR FASTNESS AND VERY BRIGHT COLOURS ARE POSSIBLE. REACTIVE ARE MOST POPULAR DYESTUFF IN THE WORLD.

VAT DYES:-

CAN BE USED ON COTTON, ACRYLIC AND NYLON. THESE ARE CONSIDERED TO BE THE MOST COLOURFAST OF ALL DYE CLASSES.THEY ARE USED IN TEXTILE PRODUCTS REQUIRING COLOURFASTNESS TO COMMERCIAL LAUNDERING WITH HIGH TEMPERATURES AND POSSIBLY BLEACH. (EXAMPLES: UNIFORMS, COMMERCIAL LINES, ETC.

ACID DYES:-

USED ON NYLON, SPANDEX AND SOME SPECIALIZED ACRYLICS. THESE DYES OFFER A WIDE RANGE OF BRIGHT COLOURS, BUT THE COLOUR FASTNESS VARIES WITH THE DIFFERENT DYES IN THE CLASSIFICATION.

CATIONIC OR BASIC DYES:-

USED PRIMARILY ON ACRYLIC. THESE DYES PRODUCT BRIGHT COLOURS WITH EXCELLENT COLOUR FASTNESS.

DISPERSED DYES:-

USED ON POLYESTER, NYLON, ACETATE AND OTHERS, A GOOD RANGE OF COLOUR IS AVAILABLE WITH THESE DYES BUT COLOUR FASTNESS CAN VARY CONSIDERABLY.

PIGMENTS:-

ANOTHER IMPORTANT CATEGORY OF COLORANTS USED IS KNOWN AS PIGMENTS. MOST DYES ARE DISSOLVED IN WATER, ABSORBED INTO THE FIBRES, BUT PIGMENTS ONLY LIE ON THE SURFACE. THEY DO NOT ADHERE TO THE FABRIC WITHOUT A RESIN BINDER. THIS BINDER WHICH IS USUALLY MIXED WITH THE PIGMENT, ACTS LIKE AN ADHESIVE. THE TWO MOST COMMON USES FOR PIGMENTS ARE PRINTING OPERATIONS AND SOLUTION DYEING OF THE POLYMER MELT PRIOR TO EXTRUSION OF SOME SYNTHETIC FIBRES.