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Rayon, also called viscose [1] and commercialised in some countries as sabra silk or cactus silk, [2] is a semi-synthetic fiber [3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [4] It has the same molecular structure as cellulose. Many types and grades of viscose fibers and films exist.
rayon Rayon is a transparent fiber made of processed cellulose. Cellulose fibers from wood or cotton are dissolved in alkali to make a solution called viscose, which is then extruded through a nozzle, or spinneret, into an acid bath to reconvert the viscose into cellulose. A similar process, using a slit instead of a hole, is used to make ...
Before synthetic fibres were developed, cellulose fibres were made from natural cellulose, which comes from plants. The first artificial fibre, known as art silk from 1799 onwards, became known as viscose around 1894, and finally rayon in 1924. A similar product known as cellulose acetate was discovered in 1865. Rayon and acetate are both ...
Textiles themselves are too fragile to survive across millennia; the tools used for spinning and weaving make up most of the prehistoric evidence for textile work. The earliest tool for spinning was the spindle, to which a whorl was eventually added. The weight of the whorl improved the thickness and twist of the spun thread.
The first artificial fiber, commercially promoted as artificial silk, became known as viscose around 1894, and finally rayon in 1924. A similar product known as cellulose acetate was discovered in 1865. Rayon and acetate are both artificial fibers, but not fully synthetic, being a product of a chemically digested feedstock comprising natural wood.
The name "rayon" was adopted in 1924, with "viscose" being used for the viscous organic liquid used to make both rayon and cellophane. A similar product known as cellulose acetate was discovered in 1865. Rayon and acetate are both artificial fibers, but not truly synthetic, being made from wood. [4]
Cuprammonium rayon is usually made in fine filaments that are used in suit jacket linings as well as lightweight summer dresses and blouses, sometimes in combination with cotton to make textured fabrics with slubbed, uneven surfaces. [3] The fabric is commonly known by the trade name "Bemberg", owned by the J.P. Bemberg company. The fabric may ...
These strands of yarn are twisted together in the opposite direction to make a thicker yarn. Depending on the direction of this final twist, the yarn will have either s-twist (the threads appear to go "up" to the left) or z-twist (to the right). For a single ply yarn, the direction of the final twist is the same as its original twist.