Robots Running the Laboratory

Automated equipment for managing dye mixing, quality control, and laboratory testing includes Datacolor International's range of AutoLab laboratory dispensing and solution mixing systems that automate dye formulation testing and reduce testing time and costs. The AutoLab 100Plus dispenses three dye formulations simultaneously. Laboratory ..

Modifying Cotton for Dyeing

A Study aminized cellulose in cotton fabric with monoazo vinyl sulfone dyes followed by reducing the azo group to an amino group. Diazotization and coupling with different naphthols confirmed that the amino group formed a part of the cellulose molecule. Researchers reacted the aminized cellulose with three cold type reactive dyes in the a..

Decolorisation and Degradation Kinetics of Reactive Dye Wastewater by a UV/Ultrasonic/Peroxide System.

Researchers studied the use of ultraviolet (UV) and ultrasonic vibrations in the presence of hydrogen peroxide to decolorize wastewater from reactive dyeing. Kinetic studies determined the effects of pH and peroxide dosage. Degradation of the reactive dye followed a pseudo first order kinetic model at differing initial pH and peroxide dos..

Smart Rinsing: A Step Change in Reactive Dye Application Technology.

Bleaching, washing, and rinsing consume 80 percent of the water, 90 percent of the energy, and 70 percent of the time used in the reactive dyeing of cellulosic substrates. Rinsing systems include drain and fill rinsing, overflow or flood rinsing, combined cooling and rinsing depends on the liquor ratio, rinsing liquor temperature, electro..

Dyeing Machine Control Using In-Line Colour Measurement. Part 3: Online Dyeing Quality Control.

Researchers developed a mathematical model to predict the uneven levelness in a dyed yarn package and used the model and in-line measurements of dye liquor concentration and liquor temperature feedback control to achieve and maintain a set rate of dye exhaustion in a pilot scale dyeing machine. The system functions for both all-in and con..

The Use of colorimetry in the Control of Dyeing Processes.

A study attached an in-line analyzer flow cell to a pilot scale package dyeing machine to control the amount of dye exhausted during the dyeing cycle. The curved back of the flow cell provided multiple path lengths for adequate by precise measurement of absorbance over three decades of dye concentration change. Regression analysis and Lap..

Oxidative Degradation of Dyes and Surfactant in the Fenton and Photo- Fenton Treatment of Dyehouse Effluents.

Researchers studied the oxidative degradation of two dyes and a nonionic surfactant by Fenton's reagent (iron sulfate and hydrogen peroxide) in the presence of ultraviolet irradiation. The study determined residual total organic carbon (TOC) as a function of time at differing initial TOC concentrations and temperatures. Residual TOC value..

HT Jet Dyeing Machine for Ecological and Economic Piece Dyeing.

Then's Airflow AFT high temperature jet dyeing machines directly inject dyes, chemicals, and dyeing assistants dissolved in the treatment liquor into a finely sprayed and uniformly distributed air stream. The machines consume 50 percent less water than conventional jet and overflow machines based on the hydraulic principle. The eliminatio..

Causes of Optically Bleached Cotton Knit-wear Yellowing.

Researchers used infrared and ultraviolet-visible spectroscopy to study the effects of finishing, making-up, and storage on the yellowing of optically bleached cotton knit fabrics, and monitored the formation of yellow stains under the influence of such factors as light, weather, lubricating oil, perchloroethylene, and packaging materials..

Advantages of Decreasing Water Consumption in Textile Dyeing

Water is a scarce and expensive resource for the dyeing industry, which has historically used large quantities of water for its processes and generated large quantities of effluent as a result. For cost and environmental reasons, therefore, it has become imperative to conserve water. A review of water conservation discusses the control of..