The fabric must be deconstructed and the length and weight of several pieces of spandex used to calculate the denier. Elastane fibres, better known under their trade names, Lycra and Dorlastan, represent a further high point in the development of man-made fibres. The terms spandex, Lycra, and elastane are synonymous. The incorporation of spandex to the fabric structure effects many of the fabric properties. Return to Fiber Characteristics Index. Spandex filament is used for produce stretch fabrics. Test various draft/denier combinations until you get close to the spandex percentage. Next, the prepolymer is reacted with a diamine of equal amount. Production Process of Spandex Fiber An interesting fact about spandex is that it was developed as a substitute for rubber. Development began during World War II when rubber production was being monopolised for the war, but it was not until over a decade later that large-scale production was possible. Spandex Fiber. Chemically, it is made up of a long-chain polyglycol combined with a short diisocyanate, and contains at least 85% polyurethane. From this information, you can calculate a percentage of spandex by weight. © 2020 Manufacturing and Engineering Design Blog, The Different Properties of Spandex Fibers, on The Different Properties of Spandex Fibers. Hardness- there is a ratio between the soft and hard fabrics of spandex, which allows for it's elasticity (Singha, n.d.) Melting point- 250 degrees Celsius, but starts to stick at 175 degrees Celsius (Senthilkumar, Anbumani, Hayavadana, 2011) Solubility in Various Solvents- water: insoluble, therefore does not dissolve A draft of 1 (1:1 ratio) is no elongation at all. Recovery Properties: A good spandex should recover close to its original length once after stretching and releasing the applied load. Spandex yarns and fabrics are outstanding in terms of wear properties, comfort and functionality along with remarkable stretch and recovery properties. Most weft knitting processes us a draft of 2.0 to 3.0. Cotton woven fabrics containing spandex show higher contraction, crease recovery, … What type of denier has been used so for? From the percentage of spandex, an approximate denier can be calculated. FTC (Federal Trade Commission) Definition-A manufactured fiber in which the fiber forming substance is a long-chain synthetic polymer comprised of at least 85% of a segmented polyurethane. This is not a practical draft. Spandex is that the preferred name in North America, while elastane is most frequently used elsewhere. From this information, you can calculate a percentage of spandex by weight. If the spandex has been heat set, weigh a piece of the fabric and then remove either fiber and weigh again. Knit fabric can more easily deform or stretch by compressing or elongating the individual stitches that form the fabric. This in turn affects the appearance of the fabrics and thus the overall … It can be used as a representation of the huge milestones we have made in the development of man-made fibers. 20 stated that the spandex can be used on modified worsted spinning system to produce spandex core-spun yarn and studied the influence of spandex drafting ratio and yarn twist factor on tensile properties and elasticity of the core-spun yarn. Items from 15D to 2000D are available in dull, clear, solution dyed, anti-chlorine, easy dyeable, low stress, heat resistant … It’s often mixed with cotton or polyester. As a consequence, single-knit fabrics may have permanent deformation. Some applications of spandex are: Your email address will not be published. Of all the above-listed methods, the solution dry spinning is the most common and produces approximately 94.5 percent of the world’s spandex fibers. Microstructures and mechanical properties of melt spinning spandex were studied in this article.Cross section and longitudinal surface were observed and analyzed by JSM-5610LV scanning electron microscopy. Spandex yarn is a man-made elastic fiber developed. A draft of 2 is 100% spandex elongation. NEWSTAR® spandex is famous for its full range of specifications and rich variety. Q2000 DSC differential scanning calorimeter was used to test the glass transition temperature and melting temperature which indicated glass transition temperature is about 44°C and … Spandex Fiber | Properties of Lycra | Elastane Fiber 0. If the spandex has been heat set, weigh a piece of the fabric and then remove either fiber and weigh again. Introduce New Product, Service and Material | COADEngineering. Most weft knitting processes us a draft of 2.0 to 3.0. Spandex is a synthetic fabric that is prized for its elasticity. Outstanding shape retention in knitwear ( 8). The strands are heated in the presence of nitrogen and solvent gas; this is the process that causes the liquid polymer to react chemically and form solid strands. Kabao Industries produces ACY fibers that have an extension-at-break greater than 200 percent and show … Acids: It has preventive power against all of the acidic action. Min et al. This includes pre-polymers which produce the backbone of the fiber, stabilizers which protect the in-tegrity of the polymer, and colorants. Raw Materials . The core component was spandex with 20D and 40D while sheath consisted of lyocell yarn; eco-friendly regenerated cellulosic This is not a practical draft. NEWSTAR® spandex is produced by advanced “dry-spinning” technology, having the properties of good evenness, moderate stretch and stable quality. A single fiber is made up of multiple smaller individual fibers. In knit product production, Lycra is a popular word. Listed manufacturers, suppliers, dealers & exporters are offering best deals for polyester spandex fabrics. The fiber is characterized by its exceptional elastic and recover properties. properties of spandex and cotton blend are very important to determine the end-used of the elastic product[4-5]. Spandex, Lycra or elastane is a synthetic fiber known for its exceptional elasticity. The synthetic fiber is also known as lycra or elastane and is popular for its exceptional elasticity. It is an elastomer, which means it can be stretched to a certain degree and it recoils when released. Day by day, the using area of spandex increase rapidly. Specific test method is used to test the elongation recovery after stretching the yarn up to 300% elongation. Your email address will not be published. Spandex is a 100% synthetic fiber. Despite having different names, Lycra, spandex, and elastane are all the same material, and these fabrics can stretch to 5-8 times their usual size. Your email address will not be published. The fabric must be deconstructed and the length and weight of several pieces of spandex used to calculate the denier. Swimwear and lingerie owe their figure-flattering fit to LYCRA®. It is a polyether - polyurea copolymer that was invented in 1958 by chemist Joseph Shivers at DuPont 's Benger Laboratory in Waynesboro, Virginia. Save my name, email, and website in this browser for the next time I comment. The spinning solution then goes into a cylindrical spinning cell. Required fields are marked *. As I have fabric but no information about its denier? Spandex yarn is ordinarily used in athletic or dynamic dress. Spandex is used in a wide range of garments due to its high elasticity and significant strength. Spandex is a term used as an anagram for the word expands. This should give you an acceptable fabric. Despite the fact that the general consumer has a preference for choosing apparels made from natural fibers like cotton and linen, there is a tendency for these fabrics to crease. It could be elastic 5 to 7 times of its original length. Most of these garments are skin-tight and often dry faster than ordinary fabrics. Chemically, it is made up of a long-chain polyglycol combined with a short diisocyanate, and contains at least 85% polyurethane. Especially this fiber is used to produce different types of underwear of women by mixing with cotton or other fiber. We provide information such as General, Process, Properties, Company Profiles, Patent, Suppliers, Market, Report about Spandex Fiber ... Spandex or elastane is a synthetic fiber known for its exceptional elasticity. After dilution into a thinner solution, it’s then pumped into the fiber production cell. From the percentage of spandex, an approximate denier can be calculated. A draft of 2 is 100% spandex elongation. It is suitable for more applications than ordinary spandex. Rubber is produced naturally or synthetically while Spandex can only be synthetically manufactured. Present paper reports the effect of change of spandex denier on the properties of stretchable lyocell-spandex cover spun yarn. Industrially, spandex is called lycra. This elastomeric is come from elastic and polymer. ... One of its most valued properties that cannot be found in nature is its extraordinary elasticity. It is used for making different types of light apparel. In this study, 100% cotton, half-plated and full-plated, plain and rib fabrics which are very commonly used in underwear and outerwear clothing are investigated for physical, dimensional, geometrical, and some comfort properties and compared to each other. So, the excellent stretch of spandex compensates for the fact that it's a weak fiber. So, keep eyes on spandex and try to combine spandex with other fiber to produce suitable textile products. Basic: Hot alkali damages the spandex filament. Spandex is elastic as rubber. Spandex is used for increase the elastic property of the fabric. Spandex is an elastomeric fiber. It’s then forced into a metal plate called a spinnerette. The amount of Lycra determines the elasticity of that’s apparels. Dupont Company first produced spandex as Lycra in 1959. Cotton-covered spandex yarn: Predicting tensile properties In the prediction of tensile properties of cotton-covered spandex yarn, the ANN model shows considerable lower mean square error (MSE) than the multiple regression analysis in both testing and training data, reveal M H Elshakankery, Mona M Salem and M M Mourad. Two types of pre-polymers are reacted to produce the The yarn twist and spandex drawing ratio have influence on yarn properties. To improve the recovery performance of circular single-knit fabrics, it is now a common practice to knit a small amount … The loop length and amount of spandex are usted to determine the dimensions and properties of the knits. It is very light in weight. The classic AC air covering machine can produce the spandex fibers through any of the following means: All the above methods feature an initial step that involves the reaction of monomers to produce a pre-polymer. Lycra is a brand name for elastane, which is a highly elastic synthetic fabric. Spandex is a synthetic polymer. Can be degraded by concentrated alkalis at high temperatures. https://www.apparelsearch.com/definitions/fiber/spandex_definition.htm Cotton yarns, which are not elastomeric, do not have the ability of recovery to rearrange the stitches. Chemist Wallace H. Carothers of the Dupont Company was one of the lead players in the development … The synthetic fiber is also known as lycra or elastane and is popular for its exceptional elasticity. Effect of bleaching: Bleaching agent damages the fiber and it becomes weak. Draft is the ratio of hard yarn to spandex. Nylon is a man-made synthetic fiber that is strong while very light in weight, properties that lead to a wide variety of uses, such as fabric, rope and luggage.This fiber was first introduced in the 1930s as an early substitute for silk; it eventually became the fiber of choice for women's stockings. Spandex is a term used as an anagram for the word expands. Comfortable fit in woven fabrics, freedom of movement, shape retention, excellent drapeability and crease recovery. This should give you an acceptable fabric. Spandex fiber, also known as Lycra or elastane, is a long-chain polyurethane-polyurea copolymer that is composed of flexible macro-glycol segments and rigid di-isocyanate segments arranged in a specific order. Our findings show that the spandex drawing ratio and structures of the woven fabrics significantly affect the physical and mechanical properties of the cotton/spandex woven fabrics. Lycra is a trade name of spandex fiber was given by "Dupont" The others trade name of … Each Spandex fiber The resulting fibers are treated with a polymer such as magnesium stearate to prevent the fibers from sticking together. Spandex and rubber are often mistakenly thought of to be the same due to their common property to impart “Stretch”, but in reality, both of these are extremely different. A variety of raw materials are used to produce stretchable spandex fibers. A regression analysis was also used to derive regression relationships between each of fabric properties and spandex filament drawing ratio. This is easily done if the spandex has not been heat set. But when it release from a turn then it recovers its original length. The name "spandex" is an anagram of the word "expands". It is a manufactured texture material with elastic properties of the sort referred to nonexclusively as “Elastic Yarn”. 3. Draft ability properties: Draft ability properties are tested under dynamic condition. Single jersey knitted fabrics are generally used to make underwear and outerwear such as T-shirts. Contrary to popular belief, the term "spandex" is not a brand name, and this term is used to generally refer to polyether-polyurea copolymer fabrics that have been made with a variety of production processes. Physical Properties of Spandex: The physical properties of spandex are given below. Spandex is a synthetic polymer. The classic AC air covering machine can produce the spandex fibers through any of the following means: 2. Spandex is a generic name for a polyurethane fiber … Minimum of 90% recovery in this test qualifies a spandex for textile application. Find details of companies offering polyester spandex fabrics at best price. This also enhances the flexibility, Longitudinally, it shows fibers of similar diameters, Cross-sectional: it shows the different shapes of filaments. Your email address will not be published. Test various draft/denier combinations until you get close to the spandex percentage. Here, it’s cured and turned into fibers. Draft if the ratio of hard yarn to spandex. A draft of 3 is 200% spandex elongation, etc. Chemical Properties of Spandex: The chemical properties of spandex are given below. These fibers are superior to rubber because they are stronger, lighter, and more versatile. 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