Browsing by Author "EREN, HÜSEYİN AKSEL"

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An investigation of process parameters on colour during the dyeing of polyester in supercritical carbon dioxide media
(Wiley, 2021-05-27) Yiğit, İdil; Eren, Semiha; Özcan, Hande; Avinç, Ozan; Eren, Hüseyin Aksel; YİĞİT, İDİL; EREN, SEMİHA; EREN, HÜSEYİN AKSEL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0002-1552-8612; 0000-0003-3908-5139; AFL-4209-2022; JCE-9094-2023; AEQ-0877-2022; AEQ-0877-2022
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 degrees C (at pressures ranging from 9 to 29 MPa), a constant pressure of 25 MPa (at dyeing temperatures ranging from 40 to 140 degrees C) and a constant density range of 500-550 kg/m(3) (at combinations of dyeing temperatures ranging from 80 to 130 degrees C and dyeing pressures ranging from 18 to 28 MPa). The constant dyeing temperature, constant dyeing pressure and constant density (120 degrees C, 25 MPa, 500-550 kg/m(3), respectively) were selected according to the best results in the literature and recommendations from industrial applications for polyester dyeing in scCO(2) media. The different conditions of the studied parameters and their influence are discussed. Colour difference (Delta E) and colour strength (K/S), as well as washing fastness and bursting strength properties, were investigated and compared. Acceptable colour properties (similar to those for standard [control reference] fabric: dyed in scCO(2) media at 120 degrees C, 25 MPa pressure and 506 kg/m(3) density for 90 minutes) on polyester fabric, with commercially acceptable and quite high washing fastness levels and comparable bursting strength values (similar to those for standard fabric without significant or drastic strength loss), could be achieved with the following scCO(2) dyeing processes: at a lower dyeing pressure with the same dyeing temperature (in scCO(2) media at 120 degrees C, 21 MPa pressure and 423 kg/m(3) density for 90 minutes), at a lower dyeing temperature with the same dyeing pressure (in scCO(2) media at 100 degrees C, 25 MPa pressure and 588 kg/m(3) density for 90 minutes) and at both a lower dyeing pressure and a lower dyeing temperature with a constant density range of 500-550 kg/m(3) (in scCO(2) media at 110 degrees C, 24 MPa pressure and 526 kg/m(3) density for 90 minutes). Satisfactory and successful dyeing properties and performance similar to polyester fibre dyed under standard scCO(2) dyeing conditions with less energy consumption could be achieved with the correct scCO(2) dyeing process parameter optimisation. For instance, the dyeing process in the scCO(2) environment at the same dyeing temperature with the standard scCO(2) dyeing process (at 120 degrees C), but with a lower dyeing pressure (at 21 vs 25 MPa), resulted in a 17 kWh decrease in energy consumption. In conclusion, it is very important to choose the correct dyeing pressure to obtain level dyeing in the polyester dyeing process carried out in a scCO(2) environment and to achieve a reduction in energy consumption during dyeing in a scCO(2) medium.
Comparison of the colour fading effects of sodium hypochlorite and ozone treatments
(Wiley, 2021-05-31) Yiğit, İdil; Eren, Semiha; Karali, Recep; Yıbar, M. Fahri; Eren, Hüseyin Aksel; YİĞİT, İDİL; EREN, SEMİHA; EREN, HÜSEYİN AKSEL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü,; 0000-0002-1552-8612; 0000-0003-3908-5139; AEQ-0877-2022; AFL-4209-2022; JCE-9094-2023
Colour fading is a method that is used to achieve a vintage look in textile goods. It is desired by customers in the textile market. Additionally, customers demand that these types of products are produced by environmentally friendly methods. In this study, sodium hypochlorite and ozone were used as laboratory-scale colour fading reagents on dyed cotton fabrics. Cotton fabrics were dyed with four different primary colours: red, yellow, blue and black. Dyed fabrics were subjected to ozone and sodium hypochlorite treatment under different treatment conditions. Ozone was chosen as an alternative for comparison and it was applied at fixed flow rate (5 L/min) and time (10 minutes). Colour differences, chemical oxygen demand, bursting strength and energy, water and chemical consumptions were measured. The surface morphology was characterised by scanning electron microscopy. We can conclude that ozonation is effective in discharging colour from dyed fabric samples, and the colour-fading effect is uniform, like in sodium hypochlorite treatment. It was observed that both processes are similar in terms of strength and surface modification. Results showed a 90% cost reduction, 85% water conservation and a 26% chemical oxygen demand reduction.
Enzymatic bleaching of cotton fibres with laccase/mediator systems combined with oxygen and ozone
(Pamukkale Üniversitesi, 2008-01-01) İnkaya, Tuba; Eren, Hüseyin Aksel; Aniş, Pervin; EREN, HÜSEYİN AKSEL; ANİŞ, PERVİN; Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0003-3908-5139; AFL-4209-2022; AAH-3948-2021
Enzymes should be used in every step of pretreatment of cotton textiles in order to minimize energy and water consumption while keeping the effluent control within the tolerable standards. It has been investigated whether enzymatic bleaching of cotton textiles could be replaced with hydrogen peroxide bleaching, which is a water and energy consuming step. In this study, fungal laccase, laccase moderator systems and also oxygen and ozone feed to these systems have been experimented. The initial whiteness of the desizied fabric before bleaching was 49 stensby degree. This value did not increase over 51 stensby degree by use of enzyme and also enzyme moderator systems. Oxygen and ozone feeding at a gas flow rate of 1000 ml/min and ozone concentration of 32 mg/min have been conducted in order to increase whiteness. Oxygen feed did not have a considerable effect and whiteness degrees raised up to only 51 stensby degree, however, ozone feed enhanced to raise the whiteness of the fabric upto 68 stensby degree by enzyme alone and 70 stensby degree by enzyme moderator systems.
Ph effects on reactive orange 16 adsorption of m-poly(divinyl benzene-n-vinyl imidazol) microbeads
(Yıldız Teknik Üniversitesi, 2021-03-01) Kaplan, Büşra Elif; Kara, Ali; Eren, Huseyin Aksel; Kaplan, Büşra Elif; Kara, Ali; KARA, ALİ; Eren, Huseyin Aksel; EREN, HÜSEYİN AKSEL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0003-3908-5139; AFL-4209-2022
In this study, Reactive Orange 16, which is a reactive dye, was investigated by using magnetic poly (DVB-VIM) to determine the effect of pH on adsorption. For this reason, the effect of pH on adsorption has been investigated in detail in pH: 2 and pH: 12. Magnetic poly (DVB-VIM) microbeads were characterized by scanning electron microscopy (SEM), fourier-transform infrared spectroscopy (FTIR) studies and swelling studies.
Waterless dyeing of polytrimethylene terephthalate and polybutylene terephthalate fabrics via supercritical carbon dioxide
(Elsevier, 2023-06-22) EREN, SEMİHA; YİĞİT, İDİL; EREN, HÜSEYİN AKSEL; Özcan, İdil; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0002-1552-8612; 0000-0003-3908-5139; AEQ-0877-2022; JCE-9094-2023; AFL-4209-2022
In this study, polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT) samples were dyed n supercritical carbon dioxide (scCO2) medium. Dianix Dry Blue XF2 and CI Disperse Blue 79 were used for dyeing. Pressure and time optimisation trials were conducted, maintaining the temperature constant based on the optimal results obtained from these trials. The color, fastness, and tensile strength values were assessed. For both PTT and PBT fabrics, the closest color values to conventional dyeing were achieved when dyed with CI Disperse Blue 79 at 85 degrees C and 25 MPa, and with Dianix Dry Blue XF2 at 70 degrees C and 25 MPa. Notably, when compared to conventionally dyes samples, darker colors were obtained in scCO2 medium after 70 degrees C when dyeing with Dianix Dry Blue XF2 and after 85 degrees C when dyeing with CI Disperse Blue 79 compared to conventionally dyed samples.