Yarn insertion through regular and slotted tubes (simulating the air guide system on air-jet looms) has been investigated. A theoretical analysis describing the yarn movement during insertion and the equation of motion is presented. The effects of the conditions behind the nozzle on yarn insertion are shown in terms of the loop length and the speed of the feeding system. Experimental results of yam insertion using different conditions for the various parameters are discussed. Good agreement between experimental and theoretical results was found.
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