Camex Special Dyestuff is a range of novel 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. These dyes are specially designed to assit the dyer to achieve uniform dyeing performance by exhaust dyeing process. Camex SPECIAL dyes posses many salient features which are summaries as below.   Give brilliant and attractive shades Unfixed dyes are easily wash off Superb color yield and high rate of fixation High fixation leaves less color residual in effluent Easy wash off process saves water Substantively of dyes are same in trachoma behavior, hence reproducibility is optimum Primary exhaustion and secondary exhaustion at 60° C of each dyes are same They have good robustness with respect to electrolyte, alkali, time , temperature and material to liquor ratio   Camex SPECIAL dyes are preferred over conventional dyes due to.   Parallel fixation curves of all three dyes in trichromy Exhaust dyeing at 60° c Very high solubility in the dye bath, even in very short liquor ratio Resistance to alkaline hydrolysis (before during and after dyeing) Good degree of fixation Similar speed of diffusion / leveling Similar affinity and speed of fixation   DIFFERENT DYEING METHODS   Back to Top (1) Exhaust Dyeing Method     Minutes   Raise temperature to 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 half quantity of salt Raise temperature 10 Continue dyeing To 60° c @ 1° c/min 03 add remaining part of salt   10 continue dyeing 15 run in salt at 60 c     15 add soda ash slowly       60-90 dye at 60° c   15 Check shade (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.   (3) Jigger Dyeing   set dye bath at room temperature with required water and 05-1.0 gpl camasequest N - 1 end Fill water and load the goods on jigger - 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 at 60° & add 40 % amount of total salt - 2 ends Add remaining part of salt - 2 ends Run at 60°c - 2 ends Add soda ash at 60° c & run the fabric - 2 ends Add remaining part of soda ash & run the fabric - 2 end Run the fabric at 60° c - 4 end Cold wash - 2 ends Hot wash - 2 ends Soaping at boil - 2 ends Hot Wash - 2 ends Cold water - 2 ends Total - 28 ends   Salt and Alkali requirement for dyeing   Depth of Shade (% on weight of goods) Salt GPL Soda Ash GPL Up to 0.5 30 10 0.50-1.0 30-45 15 1.00-2.00 45-60 15 2.00-4.00 60-70 20 4.00 & Above 80-90 20   Camex SPECIAL Dyestuff 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   Recipe Camective SPECIAL 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 19 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   Back to Top (2) Pad - dry - Steam method : Padding Recipe     Camex Special Reactive dyes - 10-70 g/l   Urea - 50-100 g/l   Resist Salt - 10 g/l   (Alkali) Soda Ash - as per table   Wetting agent - 1-3 g/l   Alkali requirement     Dyestuff g/l - Soda Ash g/l   0-15 - 6   15-30 - 9   Above 30 - 12   Process :- The Fabric is first padded at room temperature with 70 -80 % expression and dried. The dried material is then steamed in a continuous steamer for 7-10 minutes at 100 - 105° and then washed and dried. Before steaming the fabric must be completely dry otherwise patches or unevenness may be observed.   Camex 'SPECIAL' Dyestuff Printing Methods: (1) Print- Dry - Steam - Wash - Dry   Recipe Camex Special Reactive dyes - X Parts   Urea - 40-100 Parts   Water - 200 Parts   Sodium Alginate Paste (6-8%) - 500 Parts   Resist Salt - 10 Parts   Sodium Bi-carbonate - 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 (Dyes without Alkali) (Mixture of Sodium Silicate + Caustic)   Recipe Camex SPECIAL Reactive 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   Recipe Camex SPECIAL Reactive 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 / lit   Soda Ash - 150 gms / lit   Potash - 50 gms / lit   Solid Caustic Soda - 25 - 30 gms / lit   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 SPECIAL Reactive 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   10 Rinse Cold 10 Rinse Warm 15-30 Soap at the boil. For Very heavy depth shades soaping required twice. 10 Rinse Warm 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.)       YELLOW CRR     RED CRR     BLUE CRR     YELLOW CGB     RED CGB     BLUE CGB     NAVY CGB     CARBON BLACK CGB   Back to Top