These  are  modified  bi-functional   reactive  dyes  having  excellent fastness properties and gives good results even on most difficult substrates. These are most suitable for cotton, viscose and their blends because of their consistency from batch to batch. Camexil reactive dyes have following features Have good all round fastness to light, rubbing and washing. Highly suitable for post mercerization and chlorine fastness. Excellent self life and cost effective Compatible with almost all reactive dyes for producing full range of shades Superb colour yield and high rate of fixation Similar speed of diffusion / leveling Similar affinity and speed of fixation Very high solubility in the dyebath, even in very short liquor ratio. Resistance to alkaline hydrolysis ( before, during, and after dyeing) They have good robustness with respect to electrolyte, alkali, time, temperature and material to liquor ratio. Camexil Dyeing Methods (1) Exhaust Dyeing:   Diagram not to scale Back to Top   Minutes   Raise temperature At 30 - 40°c   Load machine, run liquor and / or fabric. Ensure that pH is below 7. Adjust with acetic acid if necessary   05 add predissolved Dye   10 continue dyeing   02 add 5 g/l Salt   10 continue dyeing Raise temperature to 60°c@ 1.5 °c/min. while 05 add remaining salt   10 continue dyeing   15 continue dyeing at 60° c to allow a uniform temperature to be achived throughout the machine. Allow 15 minute after the last salt addition if salt is still being added when the temperature reaches 60°c   15 add Soda Ash slowly   45-60 Dye at 60°c     Check Shade   Migration Method   Diagram not to scale (2) Winch Dyeing Winches are mainly used for dyeing knitted and delicate woven fabrics. In this method dyestuff solution is added over a period of 15 minutes and goods are run at 40° C. salt addition in then followed at same temperature and goods are run for 10-15 minutes. After running the goods properly in dyes and salt, alkali is added within 10-15 minutes and required temperature is attained and goods are run for 60-90 minutes. Depending depth of shade. It is very important to add chemicals and dyestuff slowly as there are chances to get unevenness during dyeing since the fabric is in rope form. Finally fabric is washed soaped, washed and dried. Winch Dyeing Machine   (3) Jigger Dyeing Back to Top Load the goods on jigger   1 end Set dyebath at room temp, with required water + 0.5-1 g/l Camasequest N - 1 end Add half the dye solution & run the fabric - 1 end Add remaining half dye solution & run the fabric - 1 end Start raising the temp. & add 10% amount of the total salt in 2 ends - 2 ends Add 30% of total salt in 2 ends - 2 ends Add remaining salt in 2 ends - 2 ends At 60° C run the fabric - 2 ends Add soda at 60° C 1/2 the amount - 1 end Add remaining half amount of soda & run the fabric - 1 end At 60° C run the fabric - 4 end Cold ash - 2 ends Hot wash - 2 ends Soaping at boil - 2 ends Hot wash - 2 ends Cold water - 2 ends Total - 28 ends In case of dark shades salt can be added portion wise. Back to Top Jigger Dyeing Machine     Depth of Shade (% on weight of goods) Common salt OR Glauber salt (GPL) Alkali (GPL) Fixation Time Unmercerised cotton Mercerize cotton/ viscose Soda ash (Mix Alkali) Soda ash + Caustic soda (38° Be) < 0.5% 20 10 10 5 + 0.2 45 0.5 - 1.0% 30 20 15 5 + 0.2 45 1.0 - 2.0% 40 30 20 5 + 0.5 60 2.0 - 3.0% 50 40 20 5 + 0.5 60 3.0 - 4.0% 60 50 20 5 + 1.0 60 4.0 -5.0% 70 60 20 5 + 1.0 60 5.0 -6.0% 80 70 20 5 + 2.0 60 >6.0% 80 70 20 5 + 2.0 90 * Do not use mix Alkali, while dyeing of viscose fabric and their blends.   Camexil Padding Methods (1) Padding (Pad Batch Long Term) This is a simple application method where Caustic and Silicate are used. The goods are batched and then washed, soaped, washed and dried. Padding liquor is prepared as follows Back to Top Recipe Camexil Reactive dyes - X g/l   Urea - 50-100   Sodium Silicate - as per table   Caustic Solution - as per table   Wetting agent if required - 1-3 g/l   Method : The dye powder is first properly dissolved with warm water and required amount of urea is added. Sodium silicate and Caustic solution is prepared separately in required quantity of water and mixed with dye solution just before padding. The fabric is then padded with 70% Expression. It is either batched on a beam or kept on wooden planks and covered with plastic sheets. Care must be that air does not enter and dwell time of 18 -24 hrs. is given and then washed, soaped, washed and dried. If required deep shades may be given dye fixing treatment.   Cold - Pad - Batch Machine   Alkali requirements :   For padding and batching temperature at 30 - 35°C   Silicate Be °Tw Weight Ratio Na20: Sio2 Qty of Silicate GPL Qty of caustic Solution Required of 32.5% - cc/lit. Dyestuff upto 30 GPL Dyestuff above 30 GPL 37-40 / 69-77 1:3.3 135 13 18 40-42 / 77-82 1:3.3 120 11 16 48-50 / 100-106 1:2.6 100 05 10 58-60 / 134-142 1:2.1 85 - 04   Printing with CAMEXIL Reactive Dyes Steaming Method Printing Paste Recipe Back to Top   CAMEXIL dyestuff is mixed with - X Parts   Urea - 20-50 Parts   Water   200 Parts   Thickening (Sodium Alginate 4%) - 500 Parts   Sodium Bi-carbonate   20 Parts   Resist Salt - 10 Parts   Water or Thickening (As per required Viscosity) And bulk to - 10 Parts   Total - 1000 Parts   Print - Dry - Steam at 105°C for 12 -15 minutes - Hot and Cold Wash - Soap at boil for 15-20 minutes followed by rinse hot & cold wash   Washing off process   In order to achieve maximum fastness properties a proper wash off is essential for the dyed and printed goods.   Minutes   10 Rinse 50° C 10-15 Rinse at 60-70 10 Neutralization with acetic acid PH-6.5 - 7.5 15-20 Soap at the boil. For Very heavy depth shades soaping required twice. 10 Rinse at 80 ° C 10 Rinse at 50° C   Rinse Cold until clear solution is obtained.   For medium to heavy shades an after treatment with 1-2 g/l dye fixing agent is given at room temperature (40° C at acidic pH of 5-5.5 to improve fastness properties. ) Back to Top     YELLO 6GLL     G.YELLOW 3RL     YELLOW CN2R     YELLOW CRLR     ORANGE 2GL     RED CEBL     RED 3BL     RED CN2B     RED 3NG     RED CNRL     BLUE CBB     BLUE CNB     BRILL. BLUE CNG     BLUE CBF     ROYAL BLUE BBR     PATENT BLUE CRL     BLUE CRL CONS Back to Top