The Fibre formation process includes change in shape, structure and properties of the thermoplastic polymer. The polymer pellets or granules are fed into an extruder where, through heating, their melting temperature is exceeded. The polymeric melt is then transported, under pressure, to the spinneret..Yarn formation methods were originally developed for spinning of natural fibres including cotton, linen, wool and silk.
Yarn making from staple fibers involves picking (opening, sorting, cleaning, blending),
carding and combing (separating and aligning), drawing (re-blending), drafting (drawing into
a long strand) and spinning (further drawing and twisting). Silk and synthetic filaments are
produced by a less extensive procedure. Current high-production yarn-making operations are
performed on integrated machines that perform this entire sequence as one combined
The Air-Jet spinning is very sensitive to the fiber length and fiber length distibution(short fiber content) of the material being processed. The amount of wraping twist varies depending upon the length of the wrapping fibers as only a part of the total extent is utilized to wrap the core fibers. Wrapping the fibers shorter 12.5 mm practically do not make significant contribution to the strength of the yarn.Air-jet Spinning is suitable for processing medium and long staple comber cotton fibers a
The chief function of simplex frame is the attenuation of sliver. Insertion of protective twist in order to hold the fine strand of sliver. Winding of roving into a package that can be transported, sorted, donned on ring spinning machine.After carding the cotton is passed through draw frames. The draw frame draws the cotton inot thick strands.These are then spun inot thinner strands on hte simplex frame spindles. The output of the simples frame is fed to the ring frame spindles which complete t
The cost of yarn consists of several factors such as raw material energy or power, labour, capital etc. The cost of yarn excluding raw material is termed manufacturing cost. The share of the factors in manufacturing cost changes according to the yarn properties, machine operational properties and economical situation of the spinning mill.
There are various commonly used popular Yarn Formation Systems .Some of them are Cotton woollen or worsted,staple,Filament yarn formation systems. Also some of the common types of yarns like mercerdised ,dyed,grindle or twisted,yarns are discussed in this page.
The new spinning systems clearly avoid the limitations produced by the twist insertion mechanism. It is possible to increase the twist insertion rate and the yarn production speed quite considerable. Various spinning techniques specifications.
Two types of energy can be used in a specifc spinning mill; electrical energy and thermal energy. Machines, air conditioning, lamps used for illumination and compressors consume electrical energy while the thermal energy is consumed by air conditioning and processes such as fxation of yarns
In order to obtain the necessary information about energy consumption of a specifc spinning mill, one which is able to spin every kind of staple fibre (i.e. cotton, linen, polyester, viscone) in a wide count range using both ring and openend systems to be chosen.