Israt Jahan Mim
Instructor
Department Of Textile
Daffodil Technical Institute
Carding, Drawing Frame, Combing, Simplex& Ring Frame
Carding: Carding is a mechanical process that disentangles, cleans and intermixes fibres to produce a continuous web or sliver suitable for subsequent processing. This is achieved by passing the fibres between differentially moving surfaces covered with "card clothing", a firm flexible material embedded with metal pins.
Drawing Frame: Drawing, also called Drafting, in yarn manufacture, process of attenuating the loose assemblage of fibres called sliver by passing it through a series of rollers, thus straightening the individual fibres and making them more parallel. Each pair of rollers spins faster than the previous one
Combing: The fibres removes the short fibres and arranges the fibre in a flat bundle, with all the fibres going the same direction. This preparation is commonly used to spin a worsted yarn. Woollen yarns cannot be spun from fibre prepared with combs, instead, the fibre must be carded.
Ring Frame:
T he ring frame process is the last and the most important process in the yarn manufacturing process. “The machine which converts the roving into desired yarn count is called ring frame”. It is the most commonly used method in the yarn manufacturing process.
Simplex:We can say that "a simplex is a machine which converts the drawn sliver into a thin strand of fibres having some amount of twist". The sliver is drafted many times from its original length during the roving frame process and a little amount of twist is inserted into it to improve the strength of roving.