Abstract:


This project work deals with the behavior of weft yarn in terms of twist during air jet weaving. The twist in the yarn decides its structure and strength and when it is in fabric as a weft, its twist having impact on fabric properties like strength, drape, dye-up take etc. The trials are conducted for the analyzing the effect of single hole and shower type relay nozzle on the twist of the weft yarn for 13.12 Tex (45S Ne) (CVC-Chief Value Cotton) yarn and same construction of fabric. The multi hole relay nozzle is results in higher twist loss than the single hole relay nozzle. The effect also observed for the weft way tensile properties at left and right side of the fabric. At right side of the fabric lesser strength has been found than the left side of the fabric. It is found the air pressure of the nozzles is directly proportional to the twist in the weft yarn.


The package from loom shed has been tested for actual twist in the weft. Afterwards the weft extracts from the fabric and tested for twist at both left and right side of the fabric. Similarly the left and right side used for measuring the tensile properties of the fabric.


Introduction:


Air jet weaving is a type of weaving in which the filling yarn is inserted into the warp shed with compressed air. Upon release of the filling yarn by the stopper, the filling is fed into the reed tunnel via tandem and main nozzles. The tandem and main nozzle combination provides the initial acceleration, where the relay nozzle provides high air velocity across the weave shed. Profiled reed provides guidance for the air and separates the filling yarn from the warp. The insertion medium mass to be accelerated is very small, relative to the shuttle, rapier or projectile machines, which allows high running speeds.


A typical timing dig. of main and relay nozzles is shown in the following chapter. The timed groups of relay nozzles blow air on the tip of the yarn across the machine width. As result, the yarn is pulled by the air at the tip (rather than pushed from behind) throughout the insertion, minimizing the possibility of buckling which may cause weaving machine stops. This also assures the lowest possible air consumption.


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The authors are associated with the Centre for textile functions (CTF), NMIMS MPSTME Shirpur campus, Shirpur Dist- Dhule, Maharashtra.