Stripping of Dyes from Faulty Dyeings.

A literature survey summarizes dye stripping methods, detailing chemical formulae and concentrations, temperatures, and treatment times for the most commonly used dyes on cotton, acrylic, nylon, polyester, rayon, and wool fibers and their blends. Cotton f

An Investigation in Role of Multifunctional Auxiliaries in Management of Effluents from Textile Processing.

A study examined the environmental effectiveness of using the multifunctional auxiliaries Solscour (to scour polyester in jet dyeing), MTA-1000 (in polyester jet dyeing), and SPL (in finishing polyester/viscose blend fabric) in place of conventional auxiliaries. Biochemical oxygen demand (BOD) and chemical oxygen demand (COD) values for t..

Fundamentals of Dye Diffusion

Researchers installed a high speed Silicon Graphics workstation with Biosyn polymer modeling software and developed models for the diffusional motion of nylon and polyethylene terephthalate noncrystalline chain segments in fibers. They used a molecular dynamics approach to model the diffusion of naphthalene (as a model dye) in hexane (as ..

Real-Time Analysis and Control of Batch Dyeing Processes.

Researchers are developing a flow injection analysis (FIA) system for the real time determination of indigo in an application bath. The FIA method spectrophotometrically determines the concentration of indigo in its reduced state. The apparatus is designe

EMP: a new analystical method for evaluation of textile dyes

Electromolecular propulsion (EMP) is a novel electrokinetic molecualr technology. A testing instrument using EMP has been developed along with specifically formulated solvent mixtures for use in dye analysis. EMP functions via non-linear mechanisms unlike conventional electrophoresis. Analysis using EMP with various combinations of solven..

Dyeing of cotton fabric with reactive dyes using hydrogen peroxide renovated spent dye bath water

Very good reproducibility of shades was achieved in the first stage reuse of reactive dye baths except for the yellow color. Second and third stage reproducibility of shade depths were achieved with red and brown (mixture and all three) colors, respectively. Up to 95％ decolorization of spent dye bath was acheived at peroxide concentratio..

Wool dye ranges and their ecological background (German) (Wollfarbstoff-Gammen und ihr okologisches Umfeld)

Dyestuff manufacturers have developed specialized dyes for the different requirements of wool dyeing which are differentiated by their fastness and dyeing properties. The correct application of these dye ranges guarantees the dyer a reliable, reproducible dyeing process with market-conformable fastness properties. More strictly enforced e..

Controlling nylon dyeing by dye and chemical metering

Closed-loop control of the dosing of dyes and chemicals is used to obtain an on-tone build-up of shade in dyeing polyamide fibers with a binary mixture of monosulfonated acid dyes. Computerized dosing pumps control the pH, the dyebath concentrations of the individual dyes, and the total sorption of each dye during the process. This real-t..

Covalently bonding a dye molecule to polyurethane

In this study, two different molecular weights of PTMG(1000, 2000) MDI and EDA or HEDA are employed to synthesize PU copolymers. Those with HEDA as chain extender can be grafted with dye via epichlorohydrin as a coupling agent. The results of their physic

The multiple wash-off of mono-and bis-monochlorotriazinyl reactive dyes on cotton

All three alkalis used in the wash-off processes removed dye from the dyed fabric, with KOH and Na₂CO₃ being the most effective. However, NaHCO₃ seemed to present th emost attractive alternative in terms of cost, environmental impact and wash fastness. Fo