Fabstrip-RTO: Stripping agent for Turquoise blue and OBA's |
Posted: November 6, 2017 |
Both operations are of considerable technical importance but the choice of method and the factors governing the stripping vary considerably. When the grey fabrics are taken to the finishing department, the final product is aimed to be produced at the first time without having any fault. However, the finishing processes consist of a lot of specific working parameters. The risk of producing faulty material increases depending on these parameters. Stripping is one of the processes used in the textile finishing to reproduce and repair these faulty materials. There is definite need for a stripping agent which will attack the colours without damaging the material itself.
Generally, there are two types of stripping (i) back stripping-used to reduce the depth of colour and (ii) destructive stripping - used to completely remove or strip or destroy the dye from the dyed textile. Sodium dithionite and thiourea dioxide are the leading dye stripping agents in the textile industry. Sodium dithionite is the most popular and is often used with sodium carbonate as a fire retardant however the textile industry still suffers from many spontaneous fires and the concomitant emission of sulphur dioxide when the dithionite powder comes into contact with moisture. In spite of several problems and the fact that dithionite powder is inefficient and unreliable, it has retained its standing as the preferred stripping and reducing agent. The problem is aggravated and acute in case of stripping Turquoise blue shade and/or Royal blue shades. Worse still is the situation to strip an Optical Brightening Agent (OBA) from the fabric. It is clear, therefore, that the industry needs a more efficient and more reliable stripping system that gives satisfactory color removal. Sarex has developed one such product FABSTRIP-RTO which is especially recommended for stripping Turquoise blue, reactive dyes and optical brightening agent from cotton. Fabstrip-RTO also strips various classes of dyestuffs from the fabric. Unique Features:
Recommended dosage: Fabstrip-RTO : 3-6% Temperature : 95-98°C Time : 30-45min Followed by treatment with 2 g/l sodium thiosulphate at 60 °C for 15 min, hot wash and cold wash.
NOTE: 1g/l Sodium nitrate is recommend to add during stripping process to avoid fabric damage and machine corrosion.
Stripping of dyed fabric was also carried out with conventional Caustic-Hydros system (i.e.2g/l Caustic + 2g/l Hydros) in order to get a comparison between conventional and Fabstrip-RTO process. The stripping efficiency of Fabstrip-RTO for dyed fabrics is analyzed by comparing the Percent Colour Strength value of stripped fabric with dyed fabric and also by visual assessment. The stripping efficiency for OBA treated fabrics is analyzed by determining the Whiteness index by using Computer Colour Matching system. Results: Table 1 clearly indicates almost complete stripping of Turquoise dye from the fabric as the colour value has dropped down to almost 1-2% while with conventional Caustic-Hydrose system, the colour value is 58% indicating complete stripping. Further it can be observed that, the Whiteness index of the OBA stripped fabric has dropped down from 144 to 72-79, which is generally considered as the Whiteness index of ready for dyeing fabric. Table 1: Stripping efficiency in terms of % Colour strength and Whiteness index
Figure 1 depicts stripping efficiency of Fabstrip-RTO, where it can be seen that dye and OBA gets completely stripped. Figure 1: Stripping efficiency of Fabstrip-RTO Conclusion: Fabstrip-RTO is an efficient and effective stripping agent for Reactive dyes specially for Turquoise blue dye and OBA's from cotton and hence stands a promising position in textile industry.
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|