MERCERIZATION AND IT ‘S IMPORTANCE :
IMPREGNATION OF COTTON, IN THE FORM OF YARN OR FABRIC, WITH SODIUM HYDROXIDE SOLUTION (CAUSTIC SODA) AT A CONCENTRATION IN THE RANGE 200-220 GPL (GRAMS PER LITRE) AT 20°C OR 60°C UNDER CERTAIN TENSIONIS CALLED MERCERISATION.
TYPES OF FABRIC MERCERIZATION:
1. CHAIN MERCERIZATION MACHINE
2. CHAINLESS MERCERIZATION MACHINE
CHAIN MERCERIZING IS DONE ON A RANGE EQUIPPED WITH TENTER CHAINS FOR TENSION CONTROL. THE RANGE CONSISTS OF A PAD MANGLE FOLLOWED BY A SET OF TIMING CYLINDERS AND THEN A CLIP TENTER FRAME.
FRESH WATER IS SPRAYED ONTO THE FABRIC TO REMOVE THE CAUSTIC SODA AS IT IS HELD TENSIONED IN THE TENTER FRAME. THE TENTER FRAME IS FOLLOWED BY A SERIES OF OPEN WIDTH WASH BOXES WHICH FURTHER REDUCES THE CAUSTIC LEVEL. ACETIC ACID IS IN ONE OF THE LAST BOXES TO COMPLETE THE NEUTRALIZATION OF CAUSTIC.
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