Modified stretch yarns: They are produced by the presence of second heating zone during false twist or edge crimping process. They have moderate stretch (100-150%) with high bulk. Bulk yarns: They are produced by fear crimping, stuffer box, air jet and knit-de-knit processes. They have no stretch and high bulk.
How are stretch yarns made?
Stretch yarns are frequently continuous-filament synthetic yarns that are very tightly twisted, heat-set, and then untwisted, producing a spiral crimp giving a springy character. Although bulk is imparted in the process, a very high amount of twist is required to produce yarn that…
Which method of texturising produces stretched yarns?
False-twist coiling method
It is one of the most popular method to produce high stretch yarn. In false-twist coiling, the yarn bundle is twisted, heated, and untwisted in one continuous operation. A heat-set coil within each filament results; the yarn itself has no twist (hence the name “false-twist).
How are textured yarns made?
Textured yarns are synthetic filament yarns that are made bulky or stretchy by heating or other techniques. In yarns used for weaving, the warp, or lengthwise, yarns are usually made stronger, more tightly twisted, smoother, and more even than the filling, or crosswise, yarns.
What is the process of converting fibers into yarn?
Yarn spinning is a process of making or converting fiber materials into yarns. Since few centuries ago, spinning have been known as a process of converting raw materials(fiber) such as cotton and wool into yarns for making textile fabric or products.
What are the 3 major yarn categories?
The three basic classifications of textile yarn include staple fiber yarn, which uses mostly short natural fibers to make yarn; ply yarns, which involve one or more strands of staple fiber yarn wound together; and filament yarn, which is wound from one or more long continuous filaments.
What is difference between thread and yarn?
Yarns are used for weaving fabrics, Knitting fabrics, and making the thread. Threads are used for stitching products. Yarn is thinner than thread. Thread is thicker than yarn.
What is yarn?
Yarn is a long continuous length of interlocked fibres, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, or ropemaking. Thread is a type of yarn intended for sewing by hand or machine. … Embroidery threads are yarns specifically designed for needlework.
Which technique is most suitable for producing carpet yarns?
Carpets and rugs are typically constructed by tufting, where needles punch yarns through a woven backing, creating either a loop or cut pile. Advances in carpet treatments have also made them more durable, fade and stain resistant.
What are the advantages of Texturization process?
Advantage of Texturisation
Better appearance, softer handle. Higher moisture absorbency and better perspiration conductivity. Higher thermal insulation and warmth. Better air permeability.
What is the minimum number of yarns used in plain weave *?
Features or Characteristics of Plain Weave
It can be produced in a minimum repeat size of 2×2. Fabric thickness is limited. 1 up 1 down is the order of interlacement of warp and weft yarn. The fabric produced is relatively stronger.
What is the minimum number of yarns used in plain weave?
Plain, or tabby, weave, the simplest and most common of all weaves, requires only two harnessses and has two warp and weft yarns in each weave unit. To produce it, the warp yarns are held parallel under tension while a crosswise weft yarn is shot over and under alternate warps across the width of the web.
What are the types of textured yarns?
The following types of textured yarns are distinguished by production method, properties, and use: high-tensile, low-tensile, crimped, loop, shaped, bicomponent, combination, and high-bulk yarns. High-tensile yarn is called elastik in the USSR; abroad, the trade name “Helanca” is usually used.
What is yarn made from?
Yarn is a strand composed of fibres, filaments (individual fibres of extreme length),… Yarns are made from both natural and synthetic fibre, in filament or staple form. Filament is fibre of great length, including the natural fibre silk and the synthetic fibres.