Waste Water Treatment - Choosing the Right Membrane System

Molecular filtration with membrane filters can help solve many environmental problems in the textile industry. Membrane filters are suitable for use in systems for source reduction, concentrating and removing polluting elements, and reusing process water. The selection of a proper membrane filtration system depends on a careful evaluation..

Color and Computers: At a Crossroads?

The technology for computerized color matching and color prediction is progressing quickly. This technology permits the manufacture of fabric colors to within close tolerances, even between production runs, and permits dyers and printers to respond quickly to customer demands. Online color sorting equipment and software reads and records ..

Dyeing as a New Environmental Challenge.

Standards set by new, stringent environmental legislation are diminishing the value of process optimization as a pollution control strategy. Further significant decreases in the pollution arising from such processes as dyeing and finishing will probably require the development of new production procedures and control techniques. The impac..

German Ban on Dyes Based on Benzidine and Other Aryl Amines - Is It a Non Tariff Barrier?

Germany recently announced a ban on the import of all textile products colored with certain azo dyes. The banned dyes contain carcinogenic or otherwise harmful amines. The ban affects imports of apparel, household furnishings, and upholstery. The new restrictions are based on careful scientific study, and should come as no surprise to the..

Recent Technological Advances and Future Trends in Dyeing.

An overview of recent developments in dyeing highlights new performance, disperse, and reactive dyes; novel application methods for polyester, cellulosic, and wool fibers; and advances in jiggers, air jet dyeing machines, and continuous dyeing machines. Recent research is reviewed for woven fabric dyeing, garment dyeing, terry towel dyein..

Computerized Colour Matching on Database Correlation on Different Textiles.

Scientists at the Technical University of Budapest investigated the accuracy of corrective color matching programs for dyeings on fabrics with different dyeability or optical appearances. The substrates chosen for the experiments included two kinds of cotton and two kinds of nylon circular knit fabrics. Nylon dyeings utilized 11 acid dyes..

EcoSwat Processing (3)

Part Three in a series of articles on the EcoSwat exhaust dyeing of cotton continues with a discussion of soaping, softening, and finishing. To facilitate the complete removal of dye residues in the soaping bath, Sandoz has developed Sandopur RSK Liquid, which sequesters alkalies present in the soaping bath and facilitates the desorption ..

Reclamation of Surfactants from Salt Containing Industrial Effluent

Nanofiltration is a process that successfully purifies effluents containing salts. The production of surfactants, for example, results in an effluent that contains 7 to 8 percent by weight of sodium chloride. Biodegradation of surfactant effluents is only partially successful, and a subsequent filtration process is necessary to reduce the..

Reducing Environmental Pollution by Decolouration and Partial Re-use of Effluent Contaminated with Direct Dyestuffs.

Scientists investigated the decoloring of effluent containing direct dyes using flocculation and flotation. The analysis utilized a pressure expansion flotation decoloration plant developed by the Denkendorf Institute for Textile and Processing Technology. Flocculation with metal hydroxides utilized organic polymer auxiliaries. The tests ..

Studies on Color Removal by Activated Charcoal.

Researchers employed activated charcoal to decolor various aqueous dye solutions, including acid (Sandolan Rhodamine E-B and Sandolan Blue E-BL), direct (Direct Green XBN and Direct Congo Red), metal complex (Lanasyn Grey 2 BLI, Vitrolan Orange G, and Omega Chrome Bordeaux BR), vat (Novatic Brown BR and Novatic Golden Orange 3G), basic (A..