Narrow woven warp preparation
  • Narrow woven warp preparation



    Weaving preparation stages include the whole of the preliminary preparations consisting of winding, warp preparation, sizing and drawing-in, which are made in order to save time, increase speed, quality and economic efficiency by minimizing the errors that may occur during the weaving process.

    Yarns used in narrow woven fabric production are supplied as raw or dyed ready-made bobbins from yarn production companies in accordance with the customer's request and the work to be done. In some special cases where yarn folding is required, other businesses are used. The ready-made yarn bobbins are sent to the warping room to be prepared for production.

    The warp threads are placed in the creel attached to the narrow weaving machine, wrapped in small cylinders with flanges called beams. Weft yarn is generally used in bobbin weaving. The warp beams used in narrow woven fabric production are of small size.





    These dimensions are suitable for monofilament, natural or artificial fibers used for highly elastic and rubber yarns. There are various lengths of beams. Generally, aluminum warp beam is used. Large areas are not needed for storing small beams and preparing weaving. Thus, low cost for the creel and small areas for installation are sufficient.






    The quality of the weaving preparation processes is important for the work not to stop in narrow weaving machines as well as for wide weaving machines, increasing machine efficiency and fabric quality. In general, warp preparation machines consist of creel, control elements (such as yarn brakes, stop device) and yarn guides and winding unit. creel, It is the section on which there are spindles on which the bobbins are arranged and the threads are fed from the bobbins to the warp beam in regular rows. Fixed creels are mostly used for warp preparation for narrow weaving machines. Small capacity creels may be sufficient for small sized bobbins.The difference of warp preparation machines used for narrow weaving production from other wide weaving machines is the use of small flanged beams and fixed creel. In the narrow weaving warp preparation process, direct (parallel, that is, series) warp preparation method is generally used for single color and thick yarns. In direct warp preparation, the yarns fed from the fixed creel in the required number of yarns for one or more tapes are wound to the warp beam in the width of the beam and the specified length.








    Another method is warp preparation in the form of tape. It is the winding of tapes, usually 2-3 cm thick, consisting of grouped yarns, calculated according to the width of the tape to be woven, yarn count and density, on the beam with the help of a shaper.





    The width of the yarns fed from the creel is adjusted in accordance with the band width with the help of a V comb. Again, considering the bandwidth, the slider distance of the trolley is adjusted for each revolution. This setting is important for the smoothness of the winding. The tapes should be wrapped on the beam at the desired length, side by side, without leaving any gaps. This method is mostly used functionally for narrow-width single color products such as ribbons, hook-and-loop fasteners/American zippers (velcro). The warp preparation method in the form of tape is hardly used. Warp preparation machines are mostly used directly because it saves time (time) and speed in warp preparation.

    In the researches, it is understood that the conical and serial warp preparation system is used for narrow weaving machines. The difference of this process from the width weaving machine is that the drum and beam dimensions are small. Conical warping machine is preferred in large-scale narrow weaving enterprises, when more than one tape is fed from the same beam and for more serial production of the work in long lengths such as tape tape or belt weaving.






    latex warping machine, It is used for elastic warp yarns of different lengths and thicknesses, the raw material of which is rubber and spandex.





    The drawing-in process is applied to the yarns coming from the warp circle to prepare for the weaving process. Before drawing-in, the weaving machine to be used must be pre-prepared. determined for this According to the drawing-in plan, a sufficient number of lamellas are placed on the machine to control each warp thread. Powers are placed in each frame according to the number of threads it will carry. The pre-comb number is determined according to the determined yarn density and the number of teeth. The back comb is determined according to the front comb number and placed in the machine. The front reed width is adjusted according to the belt sizes ranging from 18 mm to 310 mm and the number of weaving heads used. For example, for 12 weaving heads, the reed width is 25 mm (12/25), 8/ 27 mm, 6/42 mm, 4/ 66 mm. After the pre-comb adjustment is made, weft needle and auxiliary needle adjustments are also made. Each warp thread taken from the beams for drawing-in is passed through the rear reed teeth by aligning them. Then, it is first passed through the lamellas arranged in the determined number and level, and then through the eyes of the power wires according to the drawing plan. According to the pre-comb and weaving head adjustment, the warp threads drawn from the strengths are passed through the front reed teeth and wrapped in the fabric winding mechanism. Before starting the weaving process, the machine pattern setting should be made. Link or cam pattern adjustment is made according to the characteristics of the machine and the job. 



    Posted by %PM, 03% 668% 2017 18%:%Dec in Weaving

Narrow woven warp preparation