Detail study of Air Jet Loom

Air Jet Loom

The air jet weaving machine combines high performance with low producing needs. it’s a particularly high insertion rate. because of its exceptional performance, air jet machines area unit used primarily for the economical production of normal materials, covering a large vary of designs. Meanwhile, additional and additional niches and special cloth segments area unit covered; serious cotton materials like denim, terry materials, glass materials, etc.

Scope of Air Jet Loom:

• To insert the pick threads here used compressed gas.
  
• Not appropriate for the coarser count or heavier cloth.
  
• The temporal arrangement of jet activity ought to be controlled in such how that the main nozzle is provided with compressed gas from the start of the weft insertion part and therefore the the} relay nozzles also receive compressed gas.
  
• High maintenances is required.

Features of Air Jet Loom:  

• Air jet weaving machine is high speed machine having smart quality
  For instance on a weaving machine having a speed of 600 revolutions per minute the weaving cycle is 100m/s.
  
• Cam management valves have the benefits of high speed exactness of action while the electrically controlled coil valves allow easy setting.
  

Finer count of yarn is employed because the pick thread to provide fency sort of fabric. Main components of Air Jet Loom for pick Insertion:

1) TENSIONER: Additive disk sort tensioner is employed for pick insertion that maintain correct tension within the pick yarn.

2) PICK BREAK SENSOR: It is an electrical device that find any pick break within the region between pick package and accumulator and mechanically stop the loom just in case any pick break.

3) ACCUMULATOR: it’s a tool that fitted between pick package and main nozzle that unwinds a preset length of pick from the package and store it within the sort of no. of coils on a cylindrical drum. This yarn then fed in to insertion device.

4) STOPPER: It is AN electronically controlled magnetic force device integrated beside the accumulator. Its perform in cathartic the yarn at starts of insertion and stop it at the tip of insertion.

5) BALLOON BREAKER: It is fitted simply when accumulator, its perform is to separate the balloon formation. thus on cut back as flight tension also as minimize the stress fluctuation. it’s usually used for coarser yarn.

6) fastened MAIN NOZZLE: Its perform is to make the air jet from compressed gas with the desired speed and acceleration characteristics and project it in an exceedingly correct direction in to air guide channel.

7) RELAY NOZZLE OR SUB NOZZLE: Fitted nonparallel on the sley. It creates a further air flow within the direction of air jet. thus on compensate the loss of air speed.

8) PROFILE REED: Here the reed is profiled. thus on type a guide channel that guide the air jet also as pick throughout insertion.

9) PICK CUTTER: It is cam operated device fitted within the region between the mobile main nozzle and also the reed at choosing facet. Its perform is to riveting and cutting the pick when each choose at around battered.

10) AIR GUIDE CHANNEL: It is created on the reed. Its perform is guiding and confining the free enlargement of the air jet so as to keep up the rate over larger distance as attainable.

11) PICK DETECTOR: It is AN device fitted at the tip of reed at the receiving facet. Its perform is to ascertain the arrival of pick at the receiving facet .In case currently arrival or miss choose, then it sense and mechanically stopped the loom.

12) STRETCH NOZZLE: Located simply beside the pick detector .It supplement the impact of increased stretching action on the pick by the closely spaced relay nozzle at the tip of insert particle. thus on stop the possibility of pick recoiling because of action of stopper.

13) SELVEDGE CUTTER: Located at the receiving facet. it’s AN electronically operated machine that cut the pick yarn extending between cloth and auxiliary selvedge .So on separate the auxiliary selvedge that is passed out as a waste.

Weft insertion:

Weft insertion by means that of air jet has created a significant breakthrough within the early 70s and its importance is increasing additional owing to its ability to weave a wide range of materials at a awfully high speed pick insertion rate of concerning 2000 mpm. the primary arrange to use a compressed gas steam rather than shuttle is formed by Brooks in 1914.

Advantages of Air Jet Loom Over typical Loom:

• The conventional loom needs shuttle or shuttle like substance to insert the pick yarn, relatively in air jet loom there’s no need to any quite shuttle rather than shuttle here the compressed air force is employed.
  
• In the typical loom the choose insertion rate is extremely low compare to the air jet loom.
  
• The pick stop motion is machine controlled over the dissent from conventional loom
  
• In typical loom the mechanical or hand shuttle reach the weft thread to the fell of the fabric, however in air jet through air force this is done, here uniform silence, take up, uniform choosing, uniform bet up is attainable.
  
• It has the automated pick repair device.

Disadvantages:  

• Short or buckle choose
  
• Loose pick
  
• Snarling
  
• Excess dynamic pressure
  
• Weft stop downside
  
• Tip downside
  
• Timing of shed might not be correct
  
• Too high or too low main nozzle pressure
  
• Left facet warp yarn is loose.

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