Preparation before weaving
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The warp and weft yarns need to be planned and sorted before being sorted on the loom. Warp and weft yarns of different fibers adopt different planning and finishing methods. After preparation and finishing, the weavability of warp and weft yarns is improved, and the semi-finished product package meets the requirements of loom finishing and finished fabric specifications.
Generally, warp yarn preparation includes winding, twisting, rewinding, warping, sizing and warp threading. Among them, winding, warping and sizing are the key finishing processes.
Winding is a pre-weaving preparation process for winding bobbins and skeins into bobbins. Winding rewinds small packages of spinning yarn into large packages to increase the package capacity, which is beneficial to improving the finishing efficiency of subsequent processes and the transportation of spinning yarn. At the same time, in order to improve the appearance quality of the fabric and reduce yarn breakage during warping, sizing and weaving, the diameter of the spinning yarn is also checked during winding to remove defects and impurities on the spinning yarn.
Warping and finishing unwind the spinning yarn from a certain number of bobbins, and wind it into a warp beam in parallel according to the warping length and effective width required by the process for sizing or threading the warp. According to the type of spinning yarn and the process route used, the warping method can be divided into batch warping, section warping, ball warping and section warping.
Sizing, also known as warp sizing or silk sizing, improves the weavability of spinning yarns, ensures that the warp yarns can withstand severe external forces on the loom, reduces fluff, clears the shed, reduces weaving defects and warp yarn breakages, thereby improving the efficiency of the loom And the weaving preparation process is the core of fabric quality. Through sizing, the sizing is adhered to the surface of the short fiber warp yarns. After drying, a soft, tough, and elastic film is formed, making the surface of the yarn body smooth, hairy, wear-resistant, and antistatic. At the same time, the sizing penetrates into the warp yarns to strengthen the The cohesion between short fibers improves the strength of the spinning yarn and fiber bundling; for filaments, it can increase the bundling between single filaments to prevent dispersion and mutual adhesion and breakage during weaving. Part of the warp yarns are twisted, waxed and networked instead of sizing, which can shorten the process and facilitate the production of small batches and multiple varieties of fabrics.
The pre-weaving preparation of weft yarn includes winding, twisting, rewinding, shaping, weft rolling, etc. The weft yarn used for shuttleless weaving is packaged in packages and does not require weft finishing. The weaving preparation of natural filaments also includes processes such as dipping and coloring. Preparation before weaving
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