Abstract


This project work mainly focuses on the reduction of down time during warp knotting process. Warp knotting is the process of tying the warp sheets at the time of beam change. The time required for warp knotting operation should not be more as it affects the efficiency of loom shed. Parameters affecting the warp knotting process and lead to increase in the down time are taken under trials. Project study is conducted in terry weaving loom shed where reduction of down time in pile warp and ground warp beam knotting operations gives significant increase in loom shed efficiency.


Trials are conducted on work practices carried out during knotting operation such as sheet cutting, clamping and dressing etc. availability of raw material i.e. warp beam, knotting instrument and man power. Trial results shows reduction of about 15 min in pile warp knotting operation and about14 min in ground warp knotting operation. Along with it also improves the quality of warp knotting process and gives the minimum end breaks which may occurs due to crossing of ends, double end knotting, bad knotting etc.


Hence this project work helps to reduce down time of warp knotting process, to improve the quality of knotting and ultimately increases the loom shed efficiency.


Introduction


This project is mainly revolves around the process of knotting in the loom shed which is primary process to run the loom satisfactorily. Better quality of knotting ensures the better performance of loom with respect to minimum end breakages which leads to cause improvement in efficiency. Warp knotting is the process of tying the warp sheets at the time of beam change. For tying of two warp sheets it takes some time and affect on loss of loom efficiency so that this time should be optimum.


The automatic knotting machines can process a wide range of yarn types and counts at highly reliable and rapid operating conditions (up to 600 knots/minute), with mechanical or electronic control on double knots and on the sequence of warp patterns in case of multi-coloured warps. The devices bearing the threads of the old warps are taken from the weaving machine and the knotting can be started in the preparation room under better conditions, leaving the weaving machine free for rapid cleaning and maintenance operations.


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