Group no. 6 Group members- 31- Siddharth 32- Sohail 33- Sushant 34- Swaranshi [group leader] 35- Swasti 36- Tanish

Acrylic fibers have characteristics most similar to those of wool fibers, but are Lighter than wool fibers. They are Superior in warm retention, & are also light and warm. They have good elastic recovery and are resistant to crease. They are Excellent in color development and can be dyed in desired color. They are Resistant to chemicals and cannot be attacked by moths and insects. They are also Thermoplastic. properties Swaranshi 34

The polymer is formed by free-radical polymerization in aqueous suspension. The fiber is produced by dissolving the polymer in a solvent such as N,N-dimethylformamide or aqueous sodium thiocyanate, metering it through a multi-hole spinnerette and coagulating the resultant filaments in an aqueous solution of the same solvent (wet spinning) or evaporating the solvent in a stream of heated inert gas (dry spinning). Washing, stretching, drying and crimping complete the processing. Acrylic fibers are produced in a range of deniers, typically from 0.9 to 15, as cut staple or as a 500,000 to 1 million filament tow. End uses include sweaters, hats, hand-knitting yarns, rugs, awnings, boat covers, and upholstery; the fiber is also used as a precursor for carbon fiber. Production of acrylic fibers is centered in the Far East, Turkey, India, Mexico, and South America, though a number of European producers still continue to operate. All US producers have ended production. Tanish gulati,36

Production occurs in two ways---wet spun or dry spun. Using solvents to dissolve the poylmers, each process then extrudes the polymers and spins them to solidify them. The dry process does so by using warm air to evaporate the moisture, and the wet spinning process solidifies polymers through a coagulating (wet) substance and then dries the resulting fabric. The fabric is stretched and pulled during its creation creating a tensile strength in the resulting fabric. Fabrics are altered according to the needs of the purchaser. Color, specific stain resistance and tighter weaves can all be modifications to an acrylic fabric. In the dry-spinning process the spinning mass emerges from the spinneret into a spinning chamber, into which warm air is blown. In wet spinning the spin mass is pressed into a so-called coagulating bath. The largest proportion of the production is made and used as crimped staple fibre. On care labels the acrylic fibre is often designated as "PAN" and the modacrylic as "MAC". Tanish gulati,36

Since acrylic is derived from petroleum, it melts as it burns and can cause severe skin damage if it catches on fire. This material burns readily in contact with a hot iron, cigarette ash or heating element and is more difficult to extinguish than natural fibers like wool. Pilling is a disadvantage of acrylic, but has been eliminated by the technology of Pil-Trol. The fiber requires heat to "block" or set the shape of the finished garment, and it isn't as warm as alternatives like wool. Since acrylic is derived from petroleum, it melts as it burns and can cause severe skin damage if it catches on fire. This material burns readily in contact with a hot iron, cigarette ash or heating element and is more difficult to extinguish than natural fibers like wool. Pilling is a disadvantage of acrylic, but has been eliminated by the technology of Pil-Trol. The fiber requires heat to "block" or set the shape of the finished garment, and it isn't as warm as alternatives like wool. 31- Siddharth DISADVANTAGES OF ACRYLON

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Acrylic, a synthetic fibre, will not shrink or felt when washed, unlike natural fibres such as wool. However, acrylic may stretch when washed, especially when using hot water. Items made with acrylic yarn do not require the same special handling as items containing wool. 33- Sushant