Desizing Process Research Articles

Comparing the cost-effectiveness and yarn quality improvement with PVA versus conventional maize starch as the sizing agents

The clothing industry is striving to reduce material use and energy consumption during the production process to maximize resource efficiency. The production of high-quality fabrics is driven by key materials such as sizing agents. While starch and its derivatives stand as the most prevalent natural sizing agents, they are without their drawbacks, particularly during the de-sizing process. Maize starch is the most widely used sizing agent in Ethiopia’s textile sector, yet its use presents challenges both in terms of the efficiency of the weaving process and in terms of the quality of the textiles. This study focuses on the development of a new size recipe for textile fabric processing, which is exclusive to PVA synthetic sizing material. Various criteria, such as viscosity, production improvement, environment sustainability, fabric quality, ease of de-sizing, low breakage rate, and cost-effectiveness, have been considered in selecting PVA sizing agents. The study assessed parameters such as size regain, yarn elongation loss, and fabric production. The study demonstrates the potential for substantial improvements in textile production by exploiting PVA's special properties and addressing shortcomings related to traditional sizing material. This shift to PVA based sizing formulations is not only expected to improve the quality and production efficiency of the fabric, but also to meet the wider sustainability objectives of the textile industry.

A sustainable desizing process for PVA-sized cotton fabric using ultraviolet C

The textile industry has an enormous demand for energy and water. The traditional desizing method requires approximately 120 L kg–1 of water to remove size. A sustainable process has been developed using ultraviolet C for polyvinyl alcohol-based textile desizing. With the help of ultraviolet C irradiation, the cotton fabric desizing is accomplished at a lower temperature to save approximately 67% of water, 68% of time, and 83% of energy compared with conventional process without compromising the quality. The treated fabric has been characterized by Fourier transform infrared spectroscopy and wide-angle X-ray diffraction and shows no significant change in the structure of the cotton. Life cycle analysis confirms the new technique is sustainable.

Utilization of starch effluent from a textile industry as a fungal growth supplement for enhanced α-amylase production for industrial application

Desizing process in textile industry produces large volume of starch effluent. This carbon-rich waste can be used for resource recovery, such as the production of industrially useful enzymes. The present work assesses the usability of starch effluent from textile industry as an additional carbon source for enhanced production of α-amylase during solid-state fermentation (SSF) of agro-wastes by Trichoderma reesei. A significant increase (p ≤ 0.05) in α-amylase activity (25.48 ± 1.12 U mL−1) was observed with supplementation of starch effluent in SSF. Partial purification of α-amylase by 80% ammonium sulphate precipitation produced a yield of 58.39% enzyme with purification fold of 1.89. The enzyme was thermally stable at 40 °C with 90% residual activity after 5 h and 70% residual activity at 50 °C after 3 h. Using Michaelis–Menten kinetics analysis, the estimated Km and Vmax values for the partially purified α-amylase were found to be 2.55 mg mL−1 and 53.47 U mg−1, respectively. For the rapid assessment of the industrial application, desizing of the fabric was attempted. The cotton fabric was efficiently desized using α-amylase (at a concentration of 1% on the weight of fabric basis) at 80 °C. The present work demonstrates starch effluent from desizing process as a resource for the production of amylase. The amylase can further be used in the desizing process. With in-depth research, the work may lead to the development of a closed-loop, waste-recycling process for the textile industry.

Application of atmospheric pressure low temperature plasma in cotton fabric desizing

In order to solve the problem of high energy consumption and high pollution in traditional alkali desizing process of cotton fabric, atmospheric pressure low temperature plasma was used to treat pure cotton fabric containing sizing. Through single factor variable experiment, the optimum desizing process was determined. The optimum process conditions were as follows: the optimum treatment power of plasma is 400 W, the optimum treatment time is 15 min, the distance between discharge electrode and grey cloth is 1 mm, the optimum alkali boiling concentration is 8 g/L. Compared to traditional desizing process, the usage of caustic soda was saved by 60%.

Phylogenetic characterization and screening of halophilic bacteria from Algerian salt lake for the production of biosurfactant and enzymes

Environments containing significant concentration of NaCl such as salt lakes harbor extremophiles microorganisms which have a great biotechnology interest. To explore the diversity of Bacteria in Chott Tinsilt (Algeria), an isolation program was performed. Water samples were collected from the saltern during the pre-salt harvesting phase. This Chott is high in salt (22.47% (w/v). Seven halophiles Bacteria were selected for further characterization. The isolated strains were able to grow optimally in media with 10–25% (w/v) total salts. Molecular identification of the isolates was performed by sequencing the 16S rRNA gene. It showed that these cultured isolates included members belonging to the Halomonas, Staphylococcus, Salinivibrio, Planococcus and Halobacillus genera with less than 98% of similarity with their closest phylogenetic relative. The halophilic bacterial isolates were also characterized for the production of biosurfactant and industrially important enzymes. Most isolates produced hydrolases and biosurfactants at high salt concentration. In fact, this is the first report on bacterial strains (A4 and B4) which were a good biosurfactant and coagulase producer at 20% and 25% ((w/v)) NaCl. In addition, the biosurfactant produced by the strain B4 at high salinity (25%) was also stable at high temperature (30-100°C) and high alkalinity (pH 11).

Influence of Wear on the Sizing Layer and Desizing of Single Carbon Fibre-to-Fibre Friction

Carbon fibres are sized for use in the reinforcement of composite materials. The purposes for sizing include improving yarn cohesion, which is necessary for the weaving process, and increasing the adhesion between the fibres and the matrix. Nevertheless, during weaving, some fibrillation can occur, and that has detrimental effects on the weaving productivity and on the composite's properties. The purposes of this research were: (a) to determine whether abrasive wear between sliding fibres would modify the sizing and (b) to study the influence of sizing on the friction between fibres. The same type of carbon fibre was subjected to different desizing processes. The coefficient of friction between single fibres was obtained before and after desizing. The effects of sizing and sliding distance on frictional behaviour were investigated, and are related to the observed the wear of sizing layer. In fact, it increased with sliding distance and induced a decrease in the coefficient of friction. Moreover, an efficient desizing process induced a decrease of the coefficient of friction.

The Effects of the Ozone Desizing and Combined Conventional Desizing and Scouring On Tear Strength and Abrasion Resistance of 100% Cotton Terry Fabrics

In this study, the effects of ozone desizing treatment on the water absorption and tear strength of 100% cotton terry fabrics were investigated and the results were compared with those obtained by combined conventional desizing and scouring treatment. For this purpose, ozone dose, ozonation time and pile yarn length were considered as the factors. Ozone desizing process was carried out for four different terry fabric having different pile yarn lengths at two different ozone dose (500 and 1000 mL/minute), four different ozonation time (5, 15, 30, 45 minute). It was found that when the ozonation time or ozone dose increased the tear strength and abrasion resistance decreased, but the effect of ozone dose was remarkable on long ozonation duration. Also, it was determined that the combined conventional desizing and scouring process damaged the terry fabric much less than ozone desizing process.

Cotton Yarn Sizing by Acrylamide Grafted Starch Copolymer

Synthesis and characterization of copolymer obtained by grafting acrylamide onto hydrolyzed potato starch and its application in cotton yarn sizing were presented in this work. Some process parameters of starch hydrolysis and grafting, like as hydrolysis yield, grafting yield, grafting percentage, graft efficiency, and monomer to polymer conversion were determinated. Molar mass values of hydrolyzed starch and copolymer samples are located in a narrow range of 1 × 105 to 1 × 107 and 1 × 102 to 1 × 104. Grafted hydrolyzed starch, as a sizing agent, gives better results than nongrafted, particularly in terms of sizing uniformity, yarn mechanical parameters, and easier removal in subsequent desizing process.

Biodegradation of PVA by the new mixed strains isolated from a de-sizing process

The degradation characteristics of the new mixed strains isolated from a de-sizing process which could degrade PVA thoroughly were studied. The interrelation of seven kinds of single bacterium separated from mixed strains was studied through combination experiments. The degradation process was analysed through UV spectrum, IR, GPC and other methods. The enzymatic properties and enzymatic reaction dynamic processes were studied. The results showed that PVA with the initial average molecular weight of 51,260 Da could be degraded thoroughly by seven kinds of single bacterium because of their mutual coordination effect. In addition, some carboxylic acid and methyl ketone substances could be produced in the PVA degradation process by some bacteria (mainly A4 and C1). These middle smaller molecular weight materials would be further degraded thoroughly by other bacteria (mainly A1 and A3). The PVA-degrading enzyme that was produced by the mixed strains was mainly an exocellular enzyme. The enzyme reaction kinetics equation was v = 19.5[S]/(2.06 × 10−3 + [S]).

Feasible pretreatment of textile wastewater for dark fermentative hydrogen production

In this study, the yield of hydrogen production was investigated under different feedstock pretreatment conditions. The feedstock for dark fermentative hydrogen production was textile wastewater which was obtained from the de-sizing process in a textile factory, located in northern Taiwan. The wastewater was pretreated with activated carbon, cation exchange resin or was not pretreated before being fed into the batch bottles. Biohydrogen production was carried out in a batch reactor with the sludge of mixed-culture using the feedstock from the pretreated wastewater. The sludge was obtained from the Taichung municipal wastewater treatment plant. The yield of hydrogen production using the two pretreatment methods or non – treatment were compared.Results showed that the textile wastewater could remove bio-toxic inhibitors by using activated carbon. The best hydrogen yield was 1.37 mol H2/mol reducing sugar with an initial pH 7.0, as substrate concentration was fixed at 20 g total sugar/L. Using textile wastewater as feedstock for biohydrogen production was successful, in removing bio-toxic inhibitors from wastewater with activated carbon pretreatment.

Use of ultrasonic energy in the enzymatic desizing of cotton fabric

Abstract Enzyme process and ultrasound power are the two important clean technologies which have potential use in the textile industry like desizing, scouring, dyeing and so on. In the present work, the feasibility of introducing ultrasonic energy in enzymatic desizing process of cotton to improve the desizing efficiency is investigated. The results indicate that ultrasonic power value and cavitation effect were the two most important factors for improving the enzymatic desizing efficiency. The obvious saved treatment time show that the overall reaction rate between enzyme and starch could be accelerated by ultrasonic energy. Comparing with the conventional enzymatic desizing process, the ultrasound assisted system can save half the processing time and improve about 5 percent point in desizing efficiency.

Cleaner production technologies in desizing of cotton fabric

Desizing is one of the key processes for the pretreatment of cotton fabric wet processing. Prior to dyeing and printing, it is essential to remove the sizes coated on fabric. Cleaner production technologies, using which hazardous material is substituted with -amylase, an eco-friendly material, are applied for desizing of cotton fabric. The enzymatic desizing process is human-, machine-, and environmentally-friendly. Four different types of machines were used to investigate the aspects and results of enzymatic desizing. Unlike acid and oxidative desizing, biodegradation of sizes does not damage fabric and emit greenhouse gases (CO2), respectively. The highest quality of desizing was observed by using winch technology. The degree of desizing on TEGEWA scale was 8. The amount of desizing agent used was 0.5–4.0 kg/1000 liters. In winch (batch) desizing, the degree of whiteness was 76%, which is 1.5 times higher than grey fabric, but pad steam (continuous) desizing process showed 69% degree of whiteness, which is 1.35 times higher than grey fabric. The competitive results were achieved in continuous process with efficient time. This article reveals the benefits, processes and results of eco-friendly technology within the framework of textile wet process industry.

Generation of methane from textile desizing liquors

AbstractA new strategy for the biological transformation of sugar‐containing wastewaters from the textile desizing process to biogas was developed. Here, industrial liquors were separated from the following washing step by squeezing the impregnated fabrics after desizing. These waters exhibit a chemical oxygen demand of 40 g/L and allow a direct use in microbial biogas reactors without further treatment or accumulation. After reaching balanced conditions, the microbes continuously produce biogas. Moreover, the chemical oxygen demand can be reduced up to 75%. This new technology seems to be practicable and even attractive for small‐ and medium‐sized enterprises with an annual cotton production down to 2000 t. At this stage, a reliable eco‐balance of the overall process is still pending. Further investigations will be carried out soon.

Size removal on polyester fabrics by plasma source ion implantation device

Plasma treatment was evaluated as an alternative clean desizing technology in this work. As indicated by weight loss, O 2 plasma treatment efficiently removed sizing agents such as polyvintyl alcohol (PVA), polyacrylic acid esters and their mixture (MIX) on polyethylene terephthalate (PET) fabrics. SEM pictures of the plasma treated samples directly proved the disappearance of the sizing agents. XPS analysis showed apparent changes in chemical composition and functional groups of the PET surface after O 2 plasma treatment. Carbon content decreased due to the removal of sizing agents while oxygen content increased. O 2 plasma treatment also increased hydrophilic functional groups of sizing agents, which is confirmed by C 1s and O 1s deconvolution analyses. After O 2 plasma treatment, the PET fabric was subjected to conventional desizing process at different temperatures. Except for the PET fabric sized with PVA, plasma-treated fabrics showed more efficient desizing results when compared with untreated fabrics. Furthermore, the desizing effluent from the treated fabric gave lower TOC, COD and BOD values.

Anaerobic Microbial Cultures in Cotton Desizang: Efficient Combination of Fabric and Wastewater Treatment

The aim of our proposed microbial desizing process is to combine production (cotton desizing) and wastewater treatment in one process and to replace auxiliary chemicals with a mixed microbial culture. Cotton fabric desizing is integrated in the acidic phase bioreactor of a wastewater treatment system. The mixed culture removes the size from tht fabric and converts it into volatile fatty acids, which are eliminated in a second (biogas) reactor. The effluent of this reactor is recycled to the desizing reactor to close the water cycle. A starch-based product is selected as a model compound for polysaccharide sizing agents. Experiments demonstrate the high potential of this biotechnology to replace problematic auxiliaries. High activities of important enzymes (α-amylase) during fabric treatment are detected. Data on the efficiency of microbial desizing at different temperatures and a mass balance for size degradation are presented, as well as details on intermediates accumulation.