Backstepping technique based nonlinear controller for a textile dyeing process

2006 ◽  
Author(s):  
B. Bandyopadhyay ◽  
J. Desai ◽  
C. Kane
Keyword(s):  
Backstepping Technique ◽  
Nonlinear Controller ◽  
Dyeing Process ◽  
Textile Dyeing

scholarly journals Combination of wet fixation and drying treatments to improve dye fixation onto spray-dyed cotton fabric

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lina Lin ◽  
Wenju Zhu ◽  
Cong Zhang ◽  
Md. Yousuf Hossain ◽  
Zubair Bin Sayed Oli ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Reactive Dye ◽  
Fixation Time ◽  
Drying Process ◽  
Combined Treatments ◽  
Fixation Rate ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Color Uniformity ◽  
Four Levels

AbstractThe conventional dyeing process requires a substantial amount of auxiliaries and water, which leaches hazardous colored effluents to the environment. Herein, a newly developed sustainable spray dyeing system has been proposed for cotton fabric in the presence of reactive dyes, which has the potential to minimize the textile dyeing industries environmental impact in terms of water consumption and save significant energy. The results suggest that fresh dye solution can be mixed with an alkali solution before spray dyeing to avoid the reactive dye hydrolysis phenomenon. After that, drying at 60–100 °C, wet fixation treating for 1–6 min, and combined treatments (wet fixation + drying) were sequentially investigated and then dye fixation percentages were around 63–65%, 52–70%, and above 80%, respectively. Following this, fixation conditions were optimized using L16 orthogonal designs, including wet fixation time, temperature, dye concentration, and pH with four levels where the “larger-the-better” function was selected to maximize the dye fixation rate. Additionally, the color uniformity and wash and rubbing fastnesses were at an acceptable level when both treatments were applied. Finally, the dyes were hydrolyzed after wet fixation, and the hydrolysis percentages were enhanced after the drying process.

scholarly journals Reducing Energy and Water Consumption in Textile Dyeing Industry with Cleaner Production by Inlet-Outlet Modification to Reuse Wastewater

2021 ◽  
Vol 58 (S) ◽  
pp. 49-58
Author(s):  
Erkata Yandri ◽  
Rinaldi Idroes ◽  
Roy Hendroko Setyobudi ◽  
Carolus Boromeus Rudationo ◽  
Satriyo Krido Wahono ◽  
...  
Keyword(s):  
Water Consumption ◽  
Initial Conditions ◽  
Cleaner Production ◽  
Second Step ◽  
Similar Action ◽  
The Third ◽  
Dyeing Process ◽  
Modification Process ◽  
Textile Dyeing ◽  
Process Wastewater

Dyeing Finishing (DF) textile industries which consume a lot of energy, chemicals, water, etc., then produce a lot of wastewater which creates significant environmental problems, can be anticipated by applying Cleaner Production. This paper is presented to discuss the technical modification process of dyeing production machines, which reuse process wastewater to save water and energy consumption in the production process. For that reason, there are three steps taken. First, understand the process flow of the textile dyeing industry. Second, understand in detail the dyeing process of the Jet Dyeing (JD) machine. Third, implement steps on the floor, focusing on the JD machine, starting from the initial conditions until the third step. As a result, savings in water consumption per day for 10 JD machines were achieved by almost 50 %, with details; at the initial status 700 000 L, 600 000 L in the first step, 430 000 L in the second step, and finally 400 000 L in the third step. A similar action can be carried out in other processes, such as washing, de-sizing, or in other industries which also consume a lot of water and energy.

scholarly journals Adsorption Properties of β- and Hydroxypropyl-β-Cyclodextrins Cross-Linked with Epichlorohydrin in Aqueous Solution. A Sustainable Recycling Strategy in Textile Dyeing Process

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 252 ◽  
Author(s):  
José Pellicer ◽  
María Rodríguez-López ◽  
María Fortea ◽  
Carmen Lucas-Abellán ◽  
María Mercader-Ros ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Industrial Effluents ◽  
Second Order ◽  
Point Of View ◽  
Maximum Adsorption Capacity ◽  
Gravimetric Analysis ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Recycling Economy ◽  
Pseudo Second Order

β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) were used to prepare insoluble polymers using epichlorohydrin as a cross-linking agent and the azo dye Direct Red 83:1 was used as target adsorbate. The preliminary study related to adsorbent dosage, pH, agitation or dye concentration allowed us to select the best conditions to carry out the rest of experiments. The kinetics was evaluated by Elovich, pseudo first order, pseudo second order, and intra-particle diffusion models. The results indicated that the pseudo second order model presented the best fit to the experimental data, indicating that chemisorption is controlling the process. The results were also evaluated by Freundlich, Langmuir and Temkin isotherms. According to the determination coefficient (R2), Freunlich gave the best results, which indicates that the adsorption process is happening on heterogeneous surfaces. One interesting parameter obtained from Langmuir isotherm is qmax (maximum adsorption capacity). This value was six times higher when a β-CDs-EPI polymer was employed. The cross-linked polymers were fully characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA). Also, morphology and particle size distribution were both assessed. Under optimized conditions, the β-CDs-EPI polymer seems to be a useful device for removing Direct Red 83:1 (close 90%), from aqueous solutions and industrial effluents. Complementarily, non-adsorbed dye was photolyzed by a pulsed light driven advanced oxidation process. The proposed methodology is environmental and economically advantageous, considering the point of view of a sustainable recycling economy in the textile dyeing process.

In Situ Measurement of Reactive Dye Concentration Using Optical Fibre Sensing System

2011 ◽  
Vol 332-334 ◽  
pp. 1864-1867 ◽  
Author(s):  
Jun Ying Tian ◽  
Xiao Ming Zhao ◽  
Jian Fei Zhang
Keyword(s):  
Optical Fibre ◽  
Reactive Dye ◽  
Measured Data ◽  
Monitoring And Control ◽  
Monitoring And Control System ◽  
Sensing System ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
And Control

To develop an online monitoring and control system for textile dyeing process, an optical fibre sensing system was designed and developed. This paper focused on the measurement of reactive dye concentration in dyebath using the optical fibre sensing system. The optical fibre sensors were proved to be practicable to measure the dye concentration in the dye concentration range during the dyeing process. The measured data was compared with the calculated value, and the linear relation of absorbance to dye concentration was examined. The experiment included single dyes and mixture with double dyes. Dyes concentration measurement accuracy was discussed. The results show that the absorbance is proportional to dye concentration within actual dyeing concentration range. Measured data of dyes concentration well matched the calculated value. The limitations and the approach for improving this optical fibre sensing system were discussed.

scholarly journals Comparative study on natural and reactive dye for cotton coloration

2018 ◽  
Vol 16 (3) ◽  
Author(s):  
Md. Reazuddin Repon ◽  
M. Tauhidul Islam ◽  
Md. Abdullah Al Mamun ◽  
Muhammad Abdur Rashid
Keyword(s):  
Fiber Surface ◽  
Reactive Dye ◽  
Natural Dye ◽  
Synthetic Dyes ◽  
Light Fastness ◽  
Reactive Dyeing ◽  
Natural Dyeing ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Cotton Knitted Fabric

Eco-friendly textile dyeing with natural dye is a global soaring interest for avoiding environment pollution incurred by synthetic dyes. This study attempts to compare the dyeing properties of cotton knitted fabric dyed with banana floral stem (BFS) sap and reactive dye. Natural dye i.e. BFS sap was extracted from the species of Musa sapientum by roller squeezer machine. The recipe of reactive dyeing was selected to match the exact shade with the natural dyed specimens. Conformation of the dye molecule fixation onto fiber surface was assured by FTIR-ATR spectra. Comparative analysis were carried out in response of degree of color levelness, color fastness to water, washing, perspiration, rubbing, light and effluent qualities. The economic viability of natural dyeing was also estimated. The specimens dyed with BFS sap have excellent color levelness and color durability characteristic alike reactive dye except light fastness properties. Moreover, natural dyeing costs were almost half of the reactive dyeing. Finally, this inquiry forecasts a less time, energy and water consuming, economical and ecofriendly dyeing process which could be deployed as replacement of reactive dyes with a few compromises.

New benzotriazoles generated during textile dyeing process: Synthesis, hazard, water occurrence and aquatic risk assessment

2021 ◽  
Vol 403 ◽  
pp. 123732
Author(s):  
Josiane A. Souza Vendemiatti ◽  
Natália G. Camparotto ◽  
Cristiane Vidal ◽  
Joyce Cristale ◽  
Estevão Vieira de Moraes Agapito ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Process Synthesis ◽  
Dyeing Process ◽  
Textile Dyeing ◽  
Aquatic Risk Assessment

The Comparison between a Natural Reducing Agent and Sodium Dithionite in Vat, Indigo and Sulphur Dyeing on Cotton Fabric

2012 ◽  
Vol 441 ◽  
pp. 207-211 ◽  
Author(s):  
Zahra Motaghi
Keyword(s):  
Textile Industry ◽  
Waste Water Treatment ◽  
Sodium Dithionite ◽  
Reducing Agent ◽  
Point Of View ◽  
Color Strength ◽  
Dyeing Process ◽  
Pollution Problem ◽  
Textile Dyeing ◽  
Substance Consumption

In recent years, the use of low-environmental impact biotechnology giving rises to new types of treatment in the textile industry. From the environmental point of view, particularly the textile dyeing process constitutes a major pollution problem due to the variety and complexity of chemicals employed. In most industrial vat and indigo, sulphur dyeing processes, all of them are reduced mainly using sodium dithionite. This process produces large amounts of hazardous by-products which increase the costs for waste water treatment. Hence, many attempts are being made to replace the environmentally unfavorable sodium dithionite by ecologically more attractive alternatives, such as organic reducing agents or catalytic hydrogenation and natural reducing agent. In this paper ,a natural reducing agent is introduced that comes from a plant and have been studied on the substance for comparison it with sodium dithionite on vat, indigo and sulphur dyeing on cotton fabrics. The color strength of the samples was analyzed by Reflective Spectrophotometer and the color fastness of them was investigated. The results show that, the use of natural reducing agent in natural indigo dye and sulphur dye is better and for the rest of them has almost good advantage, but it cannot reduce synthetic indigo as well as sodium dithionite. Therefore, with introducing the substance, consumption of chemicals is minimized and vat, indigo and sulphur dyeing should be environmental.

Sign in / Sign up

Export Citation Format

Share Document