The sorption of several types of dye on crosslinked polysaccharides derivatives

Crosslinked polysacharides containing tertiary amine groups have been used for the recovery of various textile dyes from aqueous solutions. These polymers were prepared by reticulation of starch-enriched flour using epichlorohydrin as a cross linking agent in the presence of NH₄OH. The reaction was optimized and the products analyzed by ..

Decolorization of textile dyes by laccases from a newly isolated strain of Trametes modesta

Four ligninolytic fungi, Trametes modesta, Trametes hirsute, Trametes versicolor and Sclerotium rolfsii, were compared for their ability to produce laccases. The fungal laccases were screened for their ability to decolorize eight synthetic dyes (anthraquinone, azo, indigo and triarylmethane). The decolorization rate depended both on the s..

Solar light induced and TiO₂assisted degradation of textile dye reactive blue 4

Aqueous solutions of reactive blue 4 textile dye are totally mineralized when irradiated with TiO₂ photocatalyst. A solution containing 4 x 10-⁴M dye was completely degraded in 24 h irradiation time. The results showed that the dye molecules were completely degraded to CO₂, SO₄, NO₃, NH₄and H₂O under solar irradiation. The addition..

Peroxidase enzymes - The peroxide killer

In order to ensure that no residue of hydrogen peroxide is left on a fabric, processors will either rinse several times (using large quantities of water) or use a reduction agent such as inorganic salts. The latter can also be retained in the dye bath, leading to shade problems. Sandoz has developed a peroxide ‘iller’ which is a liquid ..

Integration of colour matching, recipe and process management and dye machine automation (German) (Integration von Produktionsrezeop-Management, Maschinenleitstanden und ERP-Systemen)

The sheer complexity of today’s production processes means that a single system supplier can never satisfy all the requirements of a modern textile finishing plant. Integration is one solution here, and should not only help to avoid repetition, but should also enable experience gathered on a daily basis to be incorporated into the recipe..

Frequently encountered problems in textile wet processing and a diagnostic approach for prevention/solutions

Firstly, the concept of colour and its relationship with dyestuffs is explained. Secondly, the implications of adverse factors that could affect or impair perception of colour are discussed. Such influencing factors range from raw material - related to process - related variables. The need for process rationalization and standardization i..

Highlights of processing machinery - X

This part focuses on the atmospheric overflow/softflow machines for batchwide dyeing of delicate and sensitive fabrics in rope form, as displayed at the recent India ITME 2000. Companies and machines featured include Overflow BT from ATYC of Spain, Loris Bellini of Italy’s FallFlow Compact, the GN28-Super from Fang’s, Hong Kong, and loc..

Importance of material: Liquor ratio and number of turns during batch dyeing of textiles

When dyeing less material than the quantity conventionally dyed in a jig, it is the normal practice to reduce the quantity of dyestuff used in the proportion relative to the weight of the fabric. The author argues that in the case of both jig and jet dyeing machines, the quantity of water taken for dyeing should be taken into account and ..

Pilot tests with electrochemical dyeing (Italian) (Prove pilota con tintura elettrochimica)

The process of electrochemical dyeing, developed and patented by Dystar, and currently being tested in a pilot study under production conditions by the Austrian firm Getzner Textil AG, is described. The process is designed for the vat dyeing of yarn in packages. The process is supported by a team of interested institutions and companies, ..

Rate of adsorption of cotton cationised towards acid dyes (Italian) (Velocita di adsorbimento del cotone cationizzato verso i colouranti acidi)

Research was carried out to test the use of DMA-AC (1, 1-dimenthyl-3-hydroxy azetidine-chloride) and/or DEA-AC (1,1-diethyl-3-hydroxy azetidine-chloride) to modify cotton, and then to use the modified cotton as an adsorbent of acid dyes. The various factors affecting the rate of adsorption of the dye were studied: the quantity and type of..