Warping is a process in which a certain number of warp yarns are wound in parallel on a warp beam or a woven shaft in a prescribed length and width. The warp yarns are used for sizing and piercing. Warping requires that the warp yarns have equal tension and are evenly distributed on the warp beam or weaving axis, and the color yarn arrangement conforms to the process regulations. Warping is the former process of sizing, and the quality of the warp beam processing directly affects the production efficiency and product quality of the sizing process. Therefore, warping is a key process in the preparation.
First, a part of the total warp yarn number required for the full-width fabric is wound into a plurality of warp beams, and then a plurality of warp beams are passed through a slashing machine or combined and wound up on a weaving shaft to meet the requirements of the total number of roots. The warp warping is characterized by high warping speed and high productivity, which is suitable for mass production and is often used in cotton.
A portion of the total warp yarn number required for the full width fabric is first formed into a strip as needed and then wound onto a warping drum. When a strip is wound to the specified length, it is cut and threaded into the strand. Then the other strip is wound in parallel next to the previous strip. In this way, the strips of one root are wound in turn until they are wound up to the prescribed number of strips. In order to form well, the warp yarns of each layer should be slightly laterally moved as the drum rotates, so that the strip has a parallelogram in cross section. Finally, the full-width warp yarn on the warping drum is wound onto the weaving shaft by a reverse shaft mechanism. The feature of the split warping method is that it can be directly made into a weaving shaft. When used for warping of multi-color or different warp yarns, it is convenient to arrange the color. Slitting is widely used in small batch, multi-variety yarn-dyed, wool, silk and other production.
(3) Sectional warping
A part of the warp yarn required for the full width of the fabric is first wound on a narrow small warp beam, and then a plurality of narrow small warp beams are simultaneously unwound into a wide warp beam. In order to weave a symmetrical pattern of fabrics, the steering of the narrow warp beams can be arranged in a clockwise and counterclockwise spacing. If a plurality of narrow small warps are sequentially placed side by side on the shaft tube, a weaving shaft for a warp knitting machine, a weaving machine or the like can be constructed.
(4) Ball warping
First, a certain number of warp yarn bundles are wound into a spherical yarn group of a mesh, which is dyed and then wound into a warp beam on a drawing machine. The warp yarns thus warp are uniformly dyed and are suitable for high-grade color fabrics such as labor cloths.