'Comparative Study report of some reactive dye in exhaust and padsilicate method'



For system setting in reactive dye following variable factor we have to observe:


1)  Machine

2)  Substrate

3)  Electrolyte

4)  Water

5)  Chemical Auxiliaries

6)  Selection of dyes

7)  Process selection


Here in bottom all lab trails we are concentrating more on Process selection and selection of dyes only. Each series of reactive dye shows excellent result in different section of textile so totally dye selection entirely depends upon us which series will be suitable for any working shop floor condition. This study has been done on cotton twill woven fabric which does not mean it is final conclusion but it is just shows that process selection and selection of dye is very important. Take only expert view only.


We have selected following dyes for our trail:-

1)       Reactive C.I Blue-21

2)       Reactive C.I Black 5

3)       Reactive RFT series dye


i.      For Reactive C.I Blue 21 trail process

Lab Trail done:

Substrate: Cotton Twill quality

Count: 20 cotton count.

Dye selected: Corazol T Blue G (Reactive C.I Blue 21)

Exhausted Dyeing % shade selected: 1% owf.


Cold Pad Batch (Silicate process) gram per litre of Reactive C.I Blue 21 selected:-10 gpl (Without Salt and with glauber salt 10 gpl also).


Batching time selected: 16 hour and 32 hour.


In cold pad- batch process sometime batch rotation time is increased from 16 hour to more than 24 hour. It is really very interesting to see whether result is affected.


 






From above sample it was clearly show dye hydrolysis is more in 32 hour batching sample and 20% lighter also as compared to 16 hour sample. And with 10 gpl glauber salt sample in pad-silicate process depth is more 15% more as compared to normal pad -silicate process.


As compared to all pad-silicate sample exhaust sample depth build is more and more brilliancy is there it can be visibly seen and tonal difference is in bluish side where as pad-silicate sample slight yellowish tone.


  1.   For Reactive C.I Black 5 trail process.

Lab Trail done:-

Substrate:-Cotton Twill quality

Count:-20 cotton count.

Dye selected:-Corazol Black B-133(Reactive C.I Black 5)

Exhausted Dyeing % shade selected:-7% owf.


Cold Pad Batch (Silicate process) gram per litre of Corazol Black B-133% selected:-10 gpl(Without Salt and with glauber salt 10 gpl also).


Batching time selected:-16 hour.


 





From above sample computer colour matching cannot show much difference but visually padding sample is slightly darker (7-8%) and slight tonal difference also as compared to exhaust sample


  1. Comparison report of Reactive yellow RFT, Red RFT, Blue RFT in exhaust method (with using Glauber salt and common salt as exhausting agent) and pad silicate process.

Lab Trail done:-

Substrate:-Cotton Twill quality

Count:-20 cotton count.


Dye selected:-Corazol yellow RFT, Red RFT, And Blue RFT

Exhausted Dyeing % shade selected:-1% owf.

Cold Pad Batch (Silicate process) gram per litre of Corazol RFT series dye selected:-10 gpl.

Batching time selected:-16 hour.


 

Figure:-





Conclusion:


Pad silicate sample of all 3 dyes clearly shows depth build up is better as compared to exhaust sample (Especially in blue RFT dye).


Note: This study has been done on cotton twill woven fabric which does not mean it is final conclusion but it is just shows that process selection and selection of dye is very important. Take only expert view only. First take trail then go for bulk dyeing.


This article has been written in good faith and problem solving altitude process.


About the Author:


The author is the Product Manager (Reactive Dyes) in Colourtex. Ind. Ltd having vast experience of 12 years in production of cotton, polyester and its blend quality in India and overseas reputed company