Dyeing of Sisal Fibres with Basic Dyes.

Researchers investigated the dyeing behavior of sisal fibers with basic dyes. An experiment dyed fibers with two basic dyes (methylene blue and malachite green) at 30-100 degrees centigrade for 60 minutes. Dye uptake of the fibers indicated that the exhaustion percentage was higher at higher temperatures and at higher concentrations of dy..

Computer Supported Optimisation of Discontinuous Dyeing Processes -- The Way Towards Cost Reduction and Fault-Free Production.

DyStar developed the Compu-dye-System computer program to optimize the processes for dyeing polyester, acrylic, wool, and blended fibers. The program uses such factors as coloring behavior of the dye and fiber, properties of the dyeing machine, levelness requirements, reproducibility, and cost structure of the factory to achieve optimizat..

Photoassisted Degradation of Dye Pollutants. 3. Degradation of the Cationic Dye Rhodamine B in Aqueous Anionic Surfactant/TiO(2) Dispersions under Visible Light Irradiation: Evidence for the Need of Substrate Adsorption on TiO(2) Particles.

Experiments compared the titanium oxide photosassisted degradation of the cationic dye rhodamine B (RhB) in aqueous dispersions with and without the anionic surfactant sodium dodecylbenzenesulfonate (DBS). RhB degraded slowly in dispersions without DBS. The process was pH independent. DBS adsorbed strongly on the TiO(2) particles and sign..

Characterization by Selected Techniques, Including Direct Dyes, of Cotton Modified by Swelling and Enzyme Treatments.

Wet processing and swelling treatments influence the reactivity and accessibility of cotton. An experiment investigating the pore structure and accessibility of cellulosic substrates altered by chemical treatments performed scouring, slack mercerization, and enzymatic hydrolysis with cellulases on cotton yarns. Analysis of the substrates ..

Color Resist Style on Wool/Natural Silk Blended Fabric Using Reactive Dyes

Researchers developed a technique for color resist printing on wool/silk blend fabric. The technique added an illuminating dye (monochlorodifluoro pyrimidine) in the printing paste. The illuminating color was fixed in the presence of a resist agent, such as Sandospase. Experiments evaluated the effects of such printing paste chemicals as ..

Development of Ecofriendly Product for Pigment Printing

Researchers used acrylate monomers and tricarboxylic acid to formulate nonformaldehyde based printing products. Pigment printing trials used formaldehyde-free Sunny Fix NF to replace melamine formaldehyde based fixing agents in printing cotton fabric. Samples printed with the Sunny Fix NF and conventional melamine formaldehyde showed comp..

Computer supported optimisation of discontinuous dyeing processes cost reduction and fault-free production

Computer programs have been developed for the dyeing of polyester and acrylic fibers, wool and their mixtures, with which the quantity of auxilliary and the dyeing process for every single dyeing recipe can be optimised. The coloring behavior of the dyestuff and the fiber, the properties of the dyeing machine, levelness requirements and r..

Reducing effluent loading in sizing and desizing

Textile effluent from woven fabric chemical finishing contains sizing agent as an important pollution substance. After weaving, the sizing agent is washed out of the grey fabric, normally passing into the effluent flow, where it is resonsible for 40-60％ of the biological oxygen demand (BOD) load. This article describes various developmen..

Regeneration of dyeing baths using membrane ultrafiltration

This article describes the separation of disperse dye and dispersing agent by membrane ultrafiltration. It gives the possibility of using membrane ultrafiltration for the regeneration of dyeing components in a polyester fibre dyeing bath. The concentration of C.I. Disperse Red 60, dispergator and the buffer salts are quantitatively noted.

Permeation of acid dyes through fibroin membranes

The permeation of typical acid dyes C.I. Acid Orange 7 (OR) and Acid Red 88 (ROC) and sodium 4-amino-3-hydroxyl-1-naphtalene-sulfonate through a fibroin membrane was studied by examining the apparent interaction between the dyes and the fibroin membrane. The affinity of ROC for the fibroin membrane in a 0.001 M HCI solution was only 0.2 k..