Tài liệu Recent trends in textile wet processing

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Recent Techniques In Textile Wet Processing Aravin Prince .P., M.Tech (Textiles) Lecturer/ Apparel Technology S.S.M.I.T.T, Komarapalayam aravinprince@gmail.com +91-9790080302 What is Textile Processing..? It has four basic process  Preparatory  Dyeing  Printing  Finishing  Testing Preparation  The ultimate goal of any preparation process is to produce fabric that is clean and rid of all impurities that interfere with dyeing and finishing.  Fabric preparation is the first of the wet processing steps Desizing  To remove the sizing material from the textile material (yarn/ fabric/ garment) Scouring  To remove natural impurities from natural fibers.  To remove added impurities from man made fibers Bleaching  To remove natural coloring matter from fiber structure  Mostly used hydrogen peroxide; we can use this to all type of fibers What Is “Dyeing”…..?  The pleasure derived from imparting colour to clothing has existed since the time of the earliest civilisations;  A world of fashion without colour is impossible to imagine. Coloration processes produce the most visible results of all the finishing operations carried out during the preparation of textile goods What Is Printing….?  Textile printing is the most versatile and important of the methods used for introducing colour and design to textile fabrics.  Considered analytically it is a process of bringing together a design idea, one or more colorants, and a textile substrate (usually a fabric), using a technique for applying the colorants with some precision. What is finishing…..?  This facilitates production of attractive ready-to-sell textiles intended to fulfil requirements for specific use.  This includes all processes which help to maintain the value or increase the value of the textile material.  Textile finishing therefore makes textile raw material usable by creating properties with a useful effect. Recent Techniques……? Ultrasonic Assisted Wet Processing Digital Nano printing Technology Technology Bio-Technology Plasma Technology Ultrasonic Assisted Wet Processing  Ultrasound energy is sound waves with frequencies above 20,000 oscillations per second, which is above the upper limit of human hearing.  The ultrasonic waves can be generated by variety of ways. Mostly it is produced by piezo-electric and magnatostrictive transducers Mechanisms:  Increasing swelling of fiber in water.  Reducing glass transition (Tg) temperature of the fiber.  Reduce the size of the dye particles. It helps to enhance the transport of the dye to the fiber. Applications      It degraded starch followed by ultrasonic desizing could lead to considerably energy saving as compared to conventional starch sizing and desizing. The scouring of wool in neutral and very light alkaline bath reduces the fiber damage and enhance rate of processing. It is more beneficial to the application of water insoluble dyes to the hydrophobic fibers. Among the textile fibers, polyester is structurally compact fiber with a high level of crystallinity and without recognized dye sites. Ultrasonic waves accelerate the rate of diffusion of the disperse dye inside the polyester fiber. Benefits  Energy savings by dyeing at lower temperatures and reduced processing times.  Environmental improvements by reduced consumption of auxiliary chemicals.  Increased color yields.  Enzymatic treatments supplemented with ultrasonic energy resulted in shorter processing times, less consumption of expensive enzymes, less fiber damage, and better uniformity treatment to the fabric. Digital Printing  Digital printing, the most advanced technology in textile printing is an emerging new technique.  Digital printing in simple terms is the process of creating prints generated and designed from a computer, as opposed to analog printing, which requires printing screens.  Among the various approaches for digital printing including electro photography, ink jet has gained a very significant place in the field of innovative printing techniques. Mechanism Printing Machine Nano Technology Nano Technology……  The concept of Nano tech was first developed in 1930,that time it is called as bottom science.  The term Nano arise from 1970‟s only.  The term „Nano‟ comes from a Greek word „Nanos‟ which means „Dwarf‟.  Dwarf means abnormally small. 1nm = 10-9m   It is about 75000 to 100000 times smaller than the diameter of the human hair.  This technology that can work at the molecular level, atom by atom to create large structures with improved molecules organization by controlling shape and size at the Nano scale. Application of Nano Technology in processing Nano dyeing Nano finishing Hydrophobic finish Self cleaning effect UV-protection Anti-Microbial Anti-Pollen Odour fights finish Flame retardant
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