advantages of mercerization
Larger dyeing affinity 2. In dimension stabilization, what is desired is not high swelling in the fibers, but their homogeneity, because the fibers at the outside of yarns swell more than the fibers at the inside of yarns in mercerization at low temperatures and internal tension emerges as a result of the difference between the swellings inside and outside which has a detrimental effect on stabilization. stage are: The 1 is a simple and direct method for determining the replication of the degree of mercerization. It was observed that three different fabric samples processed at three different time and conditions indicated the best unshrinking values under dry mercerization conditions and decreased shrinkage values on warp direction with increasing of processing time. Pad Chain Mercerizing Machine 2.... CARDING Carding is the process in which sliver is formed from lap by carding m/c. Cross section of mercerized cotton fibers becomes larger and assumes perfectly circular forms as shown in Figure 1. YARN MERCERIZING IN CONTINUOUS SHEET (WARP) FORM: There are three types of mercerizing machine-. Cell â OH Cell â OH + NaOH Cell â ONa + H2O Â Â Â Â Â Â Â Â Cell â ONa + H2O, 75%Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 25%. Story of mercerized cotton.-Samples of mercerized cloth were exhibited at a world’s fair in London in 1857 and attracted considerable attention; but the cost of the chemicals used in mercerizing was then so high that the process seemed hardly feasible. The increasing public awareness and sense of social responsibility related to environmental issues have led the textile industry to manufacture products with improved environmental profiles. We know that mercerizing is a additional process to improve the physical and chemical properties of the cotton yarn or fabric. The fabric advances 5yds in contact with other rollers so that caustic soda can penetrate perfectly in fabric. Then the fabric is washed properly with cold water. Two for one twister (TFO) At the yarn stage, TFO renders improved evenness, strength and elongation the material. (Caustic Recovery Plant) for recycling of caustic. Dye absorption increases with the increasing caustic soda concentration up to 13%. Moreover, using a wetting agent did not improve the stability. AT WHICH STAGE CELLULOSE CAN BE MERCERIZED? The recovery of caustic is some easier as impurities to some extent are removed by desizing. Such fabrics are called crepons. The mangles are of open type, enabling the bowls to be easily changed. Cotton mercerizing is the most popular operation. None of the imitations of silk has been more widely adopted than mercerized cotton. High flexibility to treat small and medium fabric batches (production speed up to 35 â 40 mt/ 1â). Effect of Mercerization on Cotton goods in Woven and Knit Dyeing, Higher Production and its Remedies in the Germents Industry, Readymade Garments Export Business in Bangladesh, Social Compliance Manual for CAMIO USA Knitwear Limited, Social Compliance Issues in Apparel Sector, Application of Industrial Engineering in Sewing Floor, Effect of Different Count of Yarn on Grey Fabric Properties, Scope of Fashion Merchandising in Garment Industry in Bangladesh, Planning and Controlling Process of Professional Designer in a Design Studio, Causes of Fabric Wastages in Garment Manufacturing. But Steam chamberÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â : Accumulation type. Low pressure steam is admitted into the chamber, which impinges on the fabric, gets condense and removes the alkali efficiently. The important facts to remember are: Fiber is the fundamental unit in either yarn or in cloth. The main... Alkali Degumming Alkalis hydrolyse protein by attacking the peptide bonds and are said to have severe damaging effect on protei... Waterproof Breathable Fabric: Waterproof breathable fabrics are one of the harsh weather fabrics that protect the wearer without hamp... Degumming of Raw Silk Degumming is at the heart of wet processing of raw silk. The other advantage of hot mercerizing process is that no wetting agent is needed even for mercerization of grey fabrics. Mercerize definition, to treat (cotton yarns or fabric) with caustic alkali under tension, in order to increase strength, luster, and affinity for dye. mercerization the fibre cross- section becomes more circular. In 1851, John Mercer was granted a British Patent for work he had done pertaining to cotton, linen and other vegetable fibrous materials that in effect caused certain changes in the character of the fiber when subjected to caustic soda, sulfuric acid, and/or other chemicals, etc. The process is continuous. Mercerized fabric is more suitable than the unmercerized fabric. fibres. Another common method of part mercerization is by mercerizing the cotton cloth in stripes. Hot mercerizing generally produces increased dye sorption as the result of the plastic nature of cotton and its response to tension. The moisture regain values of cotton yarn mercerized with sodium hydroxide solutions of various concentrationsat10Â°,18Â°and 31Â°C were determined by oven drying method and are given in table, It is seen that the moisture regain of mercerized cotton increases with increase in sodium hydroxide concentration. yarns due to sizing. Not until the later eighties did mercerization become practical, and then for two reasons. higher luster, holds more dye, more effectively absorbs perspiration, and tougher under different washing conditions). mercerization is not optimum reason being the grey fabric lacks in the Most commonly used concentration is 21-22%. First hot caustic soda can penetrate the fabric and fiber surfaces thoroughly with the result that a greater proportion of the cellulose may be modified. The yarn must be mounted evenly on the rollers. He was the inventor of the blue-print photographic process, and also of several medical or pharmaceutical preparations. The permeated caustic solution can be reused, which could offer economical benefits through the reduction of chemical use and the cost of wastewater treatment. when done in stretched form, it imparts high lusture to the fabric. ADVANTAGES OF AMMONIA MERCERISATION. Increasing of the lustre 4. Brederek, K. , Changes of Optical Properties of Cotton Textiles Through Treatment with Liquid Ammonia and Sodium Hydroxide Mercerization, Veranderungen des Glanzes und der Farbtief, Changes in Luster and Depth of Color (in German), Textilvered. Table 9: Resistance to shrinkage in twill fabrics. Mercerization of cotton fabric: Mercerization is a treatment of cotton with a strong alkali solution in order to improve luster, dimensional stability, dye affinity, chemical reactivity, tensile strength, and smoothness of the cotton fabrics. Increases above 27%, tensile strength falls rapidly. It should be soluble in caustic soda solution. It has been determined that when a scoured fabric is dipped into the mercerization flotte, the time required for completely swelling of fibers is 60 s. However this period is getting less with the aid of mechanical effects as is in the mercerization machines. Keywords: Extraction, Hemicellulose, mercerization, Pandanus Odorifer, Retting. The first washing is with hot water and then cold water. In this type, the fiber untwists and swells which causes the lumen to become rounder. Cotton fibers in the yarn bundle can be counted using a low power microscope. Since the shrinkage in the fibers increases as the time period increases, the resistance to shrinkage in the weft appears to be higher. recovery of caustic is not easy on the grey fabric as it is full of impurities The C. I. Compression molding is a commonly used processing technique with advantages such as low cost, simplicity and relative predictability. If maximum tensile strength is to be maintained, it is saber to mercerise before bleaching i.e.