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man-made fibre
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What is a man-made fibre?
Man-made fibers are created through the modification of their chemical composition, structure, and properties during manufacturing. These fibers are spun and woven into various consumer and industrial products, including clothing, home furnishings, and industrial components.
Man-made fibers include regenerated fibers from naturally occurring polymers like rayon and acetate, and synthetic fibers, which are produced from polymers created in chemical plants, typically from petroleum or natural gas by-products. Synthetic fibers can be mass-produced to meet specific requirements. Examples of synthetic fibers include nylon, acrylic, and polyester.
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How are man-made fibres different from natural fibres?
Man-made fibres differ from natural fibres because their chemical composition, structure, and properties are significantly modified during manufacturing. Natural fibres like silk, cotton, and wool consist of naturally produced polymers such as cellulose and protein and emerge from manufacturing in a relatively unaltered state.
Man-made fibres are divided into regenerated fibres (rayon and acetate) and synthetic fibres. Regenerated fibres are made from naturally occurring polymers, while synthetic fibres are produced from polymers that do not occur naturally but are produced in chemical plants from by-products of petroleum or natural gas. Unlike synthetic fibres, natural fibres don't soften when heated.
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What are some common types of man-made fibres?
Man-made fibers undergo significant chemical modification during manufacturing and are used in a wide array of consumer and industrial products. They are distinct from natural fibers like silk, cotton, and wool.
Common types include:
* Rayon The first man-made fiber, created as a substitute for silk, is made from regenerated and purified cellulose from plant sources.-
Nylon A synthetic plastic often manufactured as a fiber with high resistance to wear, heat, and chemicals.
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Acrylic fiber A synthetic resin used as a substitute for wool in clothing and home furnishings.
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Polyester fiber A synthetic fiber often blended with other fibers, known for being quick-drying and resilient.
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How are man-made fibres produced in factories?
Man-made fibers are created through significant modification of their chemical composition, structure, and properties during manufacturing. Production begins by converting polymers into a liquid or semiliquid state through dissolving or heating. The resulting liquid is then forced through a spinnerette, a device with small holes, creating fine jets that harden into filaments.
Several spinning techniques exist:
* Solution spinning Includes wet and dry spinning. In wet spinning, the spinnerette is placed in a coagulation bath to remove the solvent, followed by washing, lubrication, and drying. Dry spinning pushes the polymer solution through a spinnerette into a heated column, where the solvent evaporates.
* Melt-spinning Used for nylon fibers.The fibers are then wound onto spindles or cut into staple lengths.
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What are the advantages of using man-made fibres?
Man-made fibers are prized for their strength, toughness, resistance to heat and mildew, and ability to hold a pressed form. Unlike natural fibers, man-made alternatives can be produced to meet almost any set of required properties.
Specific advantages of using synthetic fibers in papermaking include:
* They can be made uniform with selected length and diameter, which is necessary to produce strong, durable papers.
* They have greater resistance to chemical attack and heat exposure.
* They can be used to produce dimensionally stable papers because they are not hygroscopic.3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How do man-made fibres impact the environment?
Man-made fibres, including rayon, nylon, and acrylic, have a detrimental effect on the environment. The fast fashion industry uses synthetic fibres that are derived from fossil fuels. As a result, these items are not biodegradable and will remain in landfills for centuries. When washed, synthetic clothing sheds minute microplastic fibres that are too small for waste management systems to filter. They are then discharged directly into the oceans.
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man-made fibre, fibre whose chemical composition, structure, and properties are significantly modified during the manufacturing process. Man-made fibres are spun and woven into a huge number of consumer and industrial products, including garments such as shirts, scarves, and hosiery; home furnishings such as upholstery, carpets, and drapes; and industrial parts such as tire cord, flame-proof linings, and drive belts. The chemical compounds from which man-made fibres are produced are known as polymers, a class of compounds characterized by long, chainlike molecules of great size and molecular weight. Many of the polymers that constitute man-made fibres are the same as or similar to compounds that make up plastics, rubbers, adhesives, and surface coatings. Indeed, polymers such as regenerated cellulose, polycaprolactam, and polyethylene terephthalate, which have become familiar household materials under the trade names rayon, nylon, and Dacron (trademark), respectively, are also made into numerous nonfibre products, ranging from cellophane envelope windows to clear plastic soft-drink bottles. As fibres, these materials are prized for their strength, toughness, resistance to heat and mildew, and ability to hold a pressed form.
Man-made fibres are to be distinguished from natural fibres such as silk, cotton, and wool. Natural fibres also consist of polymers (in this case, biologically produced compounds such as cellulose and protein), but they emerge from the textile manufacturing process in a relatively unaltered state. Some man-made fibres, too, are derived from naturally occurring polymers. For instance, rayon and acetate, two of the first man-made fibres ever to be produced, are made of the same cellulose polymers that make up cotton, hemp, flax, and the structural fibres of wood. In the case of rayon and acetate, however, the cellulose is acquired in a radically altered state (usually from wood-pulp operations) and is further modified in order to be regenerated into practical cellulose-based fibres. Rayon and acetate therefore belong to a group of man-made fibres known as regenerated fibres.
Another group of man-made fibres (and by far the larger group) is the synthetic fibres. Synthetic fibres are made of polymers that do not occur naturally but instead are produced entirely in the chemical plant or laboratory, almost always from by-products of petroleum or natural gas. These polymers include nylon and polyethylene terephthalate, mentioned above, but they also include many other compounds such as the acrylics, the polyurethanes, and polypropylene. Synthetic fibres can be mass-produced to almost any set of required properties. Millions of tons are produced every year.
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This article reviews the composition, structure, and properties of man-made fibres, both regenerated and synthetic, and then describes the ways in which they are spun, drawn, and textured into useful fibres. For a full understanding of the material from which these fibres are made, it is recommended that the reader begin with the article industrial polymers, chemistry of.