Cotton is a vegetable fiber, the filament of a malvaceae (from the mallow family), produced from cotton. Cotton grow in tropical and southern tropical areas. They can reach 10 meters, but when cultivated, it is a shrub limited to a size of 60 cm to 1 meter in order to facilitate its collection. Cotton plants must be replanted every year. After flowering and falling petals, the fruits turn into capsules in which the seeds mature, surrounded by fine hairs. When they reach maturity, these capsules open and let the cotton appear in the form of a ball! The cotton ball is then picked mechanically, then dried and stripped of the seeds. The linters are the remains of fibers that have remained stuck to the seeds. They are the raw material for cellulosic fibers (viscose) and paper. The seeds are used for new sowing or the production of cottonseed oil. The transformation of the fiber into yarn First, the fibers of the cotton balls are loosened in order to clean them. Various qualities of cotton can be mixed, and other raw materials can be joined. The cleaned fibers are then passed to the carding machine in order to make them regular and to give them a ribbon shape. The ribbons are stretched again and slightly twisted. It becomes prefil. This is done using the wing loom. The prefil is then spun on a ring spinning machine or on an "open-end" machine.