Camex HD reactive dye is a range of novel reactive dyestuffs. These are developed for meeting increasing demand of Economy, Efficiency & Ecology. Camex HD reactive dyestuffs are highly purified form of multiple reactive systems. These dyes have more active sites to attack the primary and secondary hydroxyl group of cellulose. These dyes show excellent coverage of dead cotton and have good migration property. Camex HD dyes have high build up and are mainly recommended for medium to dark shades. It is recommended for exhaust dyeing and continuous dyeing for cellulosics blends. The main features of Camex HD reactive dyestuffs are Excellent reproducibility and hence batch to batch variation is minimized. Superb colour yield and high rate of fixation High fixation leaves less colour residue in effluent. Easy wash off process saves water. Warm dyeing with efficiency and consumes less energy Better fastness properties. Wide range of application since it is suitable for all types of cellulosics materials like yarn, fiber, piece dyeing and garments. Camex HD reactive dyes are preferred over conventional Dyes due to Exhaust dyeing at 60°c Very high solubility in the dyebath, even in very short liquor ratio. Parallel fixation curves of all three dyes in trichromy. Good degree of Fixation Resistance to alkaline hydrolysis (Before, during and after dyeing) Similar affinity & speed of fixation Similar speed of diffusion / leveling. Dyeing Methods   These dyes are suitable for dyeing with different methods and also have wide choice of equipments to be used for dyeing. The dyeing method depends upon the type of substrate to be used and also the machinery to be used. Ttiese dyes are suitable for winch dyeing, package dyeing, jigger dyeing and beam dyeing.   (1) Exhaust Dyeing:   Diagram not to scale Back to Top   Minutes   Raise temperature At 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 20 g/l Salt Raise temperature 10 continue dyeing To 60°c @ 1 °c/min while 05 add remaining salt   10 continue dyeing   30 Continue dyeing at 60°c to allow a uniform tempreture to be achived throughout the machine.   15 add Soda Ash slowly   60-90 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. Back to Top Winch Dyeing Machine   Diagram not to scale   (3) Jigger Dyeing 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 Back to Top Jigger Dyeing Machine   Requirment of Electrolyte And Alkali For Camex HD Dyeing   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 + 0.5 45 0.5 - 1.0% 30 20 15 5 + 0.5 45 1.0 - 2.0% 40 30 20 5 + 1.0 60 2.0 - 3.0% 50 40 20 5 + 1.0 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.   Camex HD Padding Methods Back to Top (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   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.   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   Cold - Pad - Batch Machine Back to Top   Camex HD Dyes Printing Methods   Different Printing Methods can be used for printing.   (1) Print - Dry - Steam - Wash - Dry.   Recipe Camective HD Dyes - X Part   Urea - 40-100 Parts   Water   200 Parts   Sodium Alginate Paste (6-8%) - 500 Parts   Resist Salt - 10 Parts   Soda-bicarbonate - 10-25 Parts   Water - Balance   Total - 1000 Parts   Process : The fabric is first printed with the above paste and dried. It is then steamed with saturated steam for 10-15 minutes at 100 - 105°C in Star ager or for 5 - 7 minutes in a continuous steamer and then washed and dried.   (2) Print - Dry - Pad - Batch - Wash - Dry Back to Top Recipe Camex HD dyes - 10-60 Parts   Water - 200 Parts   Sodium Alginate Paste (6-8%) - 600 Parts   Resist Salt - 10 Parts   Urea - 0-20 Parts   Water or Thickner - Balance   Total - 1000 Parts   Process : Print the fabric with above paste and dry. It is then padded through 100-110° Tw sodium silicate solution containing 4-6 cc/l caustic soda of 32.5%. It is batched and covered with plastic sheet. Dwell time is about 16-24 hrs. Depending on dyestuff used. Finally it is washed and dried. This is the most simple and economical method which is widely used because of its reproducibility and brilliancy of prints.   (3) Print - Dry - Chemical Pad - Wash - Dry Back to Top Recipe Camezol HD dyes - X Parts   Water - 320 Parts   Sodium Alginate Paste (6-8%) - 500 Parts   Resist Salt - 10 Parts   Sodium Hexa Meta Phosphate - 10 Parts   Water or Thickner - Balance   Total - 1000 Parts   Process : The Fabric is printed with the above paste and dried. It is then passed through hot fixation bath maintained at 95 - 100° C containing following chemicals.     Glauber Salt - 20 gms/Ltr.   Soda Ash - 150 gms/Ltr.   Potash - 50 gms / Ltr.   Solid Caustic Soda - 25 - 30 gms/Ltr.   The fixation of prints takes 5-12 seconds. After fixation the prints are washed immediately and dried.   (4) Print - Dry - Bake - Wash - Dry.   Recipe Camex HD dyes - X Parts   Urea - 100-200 Parts   Water - 150 - 200 Parts   Sodium Alginate Paste (6-8%) - 400 Parts   Sodium Bi-Carbonate   15 - 25 parts   Resist Salt - 10 Parts   Water - Balance   Total - 1000 Parts The fabric is printed with the above paste and dried. It is then baked for 5 minutes at 140°C for 4 minutes at 150°C in dry heat. Finally the fabric is washed and dried. This method has to be followed with lot of accuracy for reproducing the results. Slight change in any parameters is likely to change the required results.   General Washing Method   In order to achieve maximum fastness properties a proper wash off is essential for the dyed and printed goods.   Minutes   15 Rinse Cold 15-20 Rinse Warm 10 Neutralization 15-30 Soap at the boil. For Very heavy depth shades soaping required twice. 10 Rinse Warm Rinse Cold until clear solution is obtained. Back to Top 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.       L.YELLOW HDRN     G.YELLOW HDR     YELLOW HD3R     RED HDRN     RED HD3B     BLUE HDGF     NAVY BLE HDR     BLACK HDR Back to Top