Environmental pollution is one of the major concerns of the textile finishing sector. The reduction or substitution of the harsh chemicals used during dyeing and printing processes is necessary. In this study, the use of ozone for the discharge printing process was examined in order to substitute the use of reductive agent and caustic soda by ozone gas. The reactive dyed cotton samples were wetted by water and some selected solutions at 25%, 40% and 60% pick up were used and subjected to ozone gas treatment. The gas flow rates were 5 and 10 l/min for 5 and 10 min treatment times, respectively. The results were compared with that of conventional discharge printed samples. Colour discharge (%), colour difference (DE), strength, washing and rubbing fastness and chemical oxygen demand (COD) values were compared and reported. Colour discharge increased at higher gas flow rates and prolonged treatment times. Although ozone printing could not attain the contour sharpness of conventional discharge printing, the addition of selected chemicals affected colour discharge and the contour sharpness. Strength tests did not show a significant decrease when using ozone treatment. Fastness tests results (washing and rubbing) were slightly higher compared with conventional discharge printed samples. COD values were much lower for ozone treatment compared with conventional discharge printing effluent. Consequently, it was demonstrated that ozone may be an environmentally friendly substitute for discharge printing. Coloration Technology Society of Dyers and ColouristsThis article was published online on 16 October 2017. Grammatical and formatting errors were subsequently identified. This notice is included in the online and print versions to indicate that both have been corrected [25 Jan 2018]. The scientific content of the article is unaffected.
Innovative supercritical carbon dioxide (scCO 2 ) treatment conditions in fluidised media technology were examined for polyester dyeing. The different dyeing processes in scCO 2 media were carried out under a constant dyeing temperature of 120°C (at pressures ranging from 9 to 29 MPa), a constant pressure of 25 MPa (at dyeing temperatures ranging from 40 to 140°C) and a constant density range of 500-550 kg/m 3 (at combinations of dyeing temperatures ranging from 80 to 130°C and dyeing pressures ranging from 18 to 28 MPa). The constant dyeing temperature, constant dyeing pressure and constant density (120°C, 25 MPa, 500-550 kg/m 3 , respectively) were 1. The disperse dye dissolves in scCO 2 . 2. Dissolved dye transfers to the polyester fibre. out in a scCO 2 environment and to achieve a reduction in energy consumption during dyeing in a scCO 2 medium.How to cite this article: Yiğit İ, Eren S, Özcan H, Avinc O, Eren HA. An investigation of process parameters on colour during the dyeing of polyester in supercritical carbon dioxide media.
Microorganisms that accumulate on the surfaces of protective mask surfaces increase the risk of the spread of infection. In the study, it is aimed to form antibacterial polypropylene (PP) nonwovens treated by propolis extracts for surgical masks. Propolis, which is biocompatible and known to be effective against many bacteria and other microorganisms, was preferred instead of metal compounds with toxic potential. In the study, two types of propolis extracts were used which were prepared in different solvent environment (50% ethyl alcohol - 50% pure water; 47% propylene glycol - 53% pure water). The amounts of phenolic compounds in the solutions obtained differently depending on the solvent and HPLC-DAD analysis of the extracts was performed. After the application of propolis extracts to PP nonwovens by immersion method, the change in their antibacterial activities were measured. According to the results, PP nonwovens with propolis show antibacterial activity against Enterococcus hirae, Escherichia coli, and Staphylococcus aureus. On the other hand, it was observed that the samples that were washed after drying (at 120 °C) lost their antibacterial effect. It is thought that the reason for this situation is that the phenolic compounds in propolis extracts, which are not fully adhered to PP fibers and soluble in water, are removed from the surface by washing.
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