• A yarn delivery rate of 450 metres per minute can be achieved in the air-jet spinning method. This production rate is much higher than the ring-spinning system ( 15 - 27 metres per minute) and the rotor spinning system ( 130 - 250 metres per minute).
• The twist insertion system in the air-jet spinning machine has the capability to insert 200000 turns per minute. This speciality helps to increase productivity by many times.
• The higher twist insertion rate in this process makes the air-jet spinning method system much cheaper and cost-effective than any other yarn spinning system.
• Since we know that the twist insertion process in the yarn spinning has a direct and decisive impact on the rate of production of the spinning machine, so the improved rate of production gets achieved just because of the very high speed of the twist insertion system in the air-jet spinning process.
• A very high airflow gets used to impart the twist into the yarn in the air-jet spinning system.
• The carded or draw frame sliver gets used as feed material in this system as the rotor spinning method.
• This spinning method gets used to spin coarse to the medium count of yarn.
• Murata company' of japan and Rieter company of Switzerland have introduced air-jet spinning machines with improved technology which has the capability to spin yarn up to 60 s count. Mainly the Polyester or polyester/cotton blends get spun on this machine.
• The yarn getting spun on an air-jet spinning machine poses low tensile strength in comparison to ring frame and rotor spinning yarn.
• It is mainly used in manufacturing woven sheeting and knitted lightweight shirting.
• The air-jet yarn poses good tenacity, evenness, the lower tendency of snarling, and pilling, high stiffness, and shrinkage. This yarn has a harsh feel.
• The sliver is fed to the drafting arrangement. 4 over 4 drafting arrangement is used in this machine which efficiently performs the drafting action at very high speed without damaging the fibres.
• Now the fibre bundle passes between a block of the nozzle and a needle holder. The needle holder has a substantially central, longitudinal axis and a guide surface that twists relative to the longitudinal axis. A pin-like guide member attached with the needle holder protrudes toward the inlet of the spindle. From this point, fibres are smoothly sucked into a hollow spindle.
• The rotational force of the air jet separates fibres from the bundle after fibres have left the guide member. Since the leading ends of all fibres are moved forward around the guide member and drawn into the spindle by the preceding portion of the fibre bundle being formed into yarn, they present partial twist and are less affected by the airflow inside the spindle.
• In other words, when the trailing ends of the fibres which have left the front rollers move to a position where they receive the powerfully whirling force of the nozzle, they are separated from the fibre bundle, extend outwardly, and twine over the spindle. Subsequently, these fibres are spirally wound around the fibre core and formed into a vortex spun yarn as they are drawn into the spindle.
Various types of spinning methods
Yarn count determination from fabric swatch or count determination from short length of yarn
Advantages and disadvantages of open end yarn
Advantages and disadvantages of ring frame process
Objectives of carding process
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