“The sectional warping is preferred over beam warping” Explain with
examples.
Answers
Answer:
Sectional warping
Sectional warping process is used to produce stripped effect on fabric. Small size creels are sufficient to fulfill the requirement of sectional warping process. Generally, V-shaped or rectangular creels are integrated with sectional warping process. In this process, a section of small number of packages (10–300 or more) are mounted on creel and all threads are threaded through tread guides and tensioners before reaching on guide rollers, then expandable creel head, and finally at beam. All threads are entrapped in holes made on beam surface at appropriate position and then the beam starts to revolve. Machine is set to stop after a fixed number of beam revolutions. It depends on the required length of warp sheet on weavers beam. After completing the exact number of revolutions machine stops, then expandable reed head is shifted to its right and shifting depends on warp yarn density or warp yarn spacing in cloth. All threads are cut and then entrapped similarly in next slot on beam surface and winding of next section starts. Total number of sections depends on total number of threads required in cloth, and total number of threads in one section. After completing total number of sections, the beaming process starts. In beaming process, the last end of all sections is simultaneously reached on double flanged warpers beam and then starts the beaming process. During beaming process, power is given only to drive the double flanged warpers beam, and sectional beam is driven only by pulling force of all threads of all sections which are unwinding from its surface. During this process, tension uniformity is a major issue. Skilled warpers are needed to do this work precisely.