The former process: fixed - winding - warping - wearing the knot
After the warp is twisted, fixed, and twisted, then winded, warped, and then put on a heel button to start weaving on the machine. If the strength of the yarn is insufficient or it is easy to fluff, it is necessary to sizing the yarn through a sizing process.
Fixed: After twisting the yarn, especially after strong twisting, the fiber has a torsional stress. When the yarn tension is small or free, the yarn will be untwisted and twisted. In order to prevent this from happening, the subsequent processing is carried out smoothly, and if necessary, the twisting process is used to stabilize the twist of the yarns.
The winding (also known as the winding) is the first process of preparation before weaving. Its task is to process the bobbin or skein from the spinning part into a bobbin that meets certain requirements on the winder.
The role of the winding process can be summarized as the following two points:
(1) The original yarn (or filament) is made into a package of capacity snare, which is provided for wefting or bleaching of warping, weft, knitting, and shuttleless weaving machines. In the capacity of the tube, the large package of the tube yarn can only accommodate about 29.2 tex (20 inches) of medium cotton yarn of about 2500 m. If the cop is used directly in warping or looms and other processes, the parking time will be too long due to frequent pipe change, which is not in line with the requirements of the process, and is not conducive to improving production efficiency. The package capacity of the package is greatly increased. Generally, the length of the package of the special yarn can reach about 100,000 meters.
(2) Remove some defects on the yarn, acrobatics, and improve yarn quality. The raw yarns transported by the spinning mill generally have more appearance defects. When passing through the yarn clearing device on the winder, the fluff, dust and weak yarns, rough knots and other impurities can be removed. Improve the appearance quality of the fabric, and increase the average strength of the yarn by removing the weak points on the yarn, thereby reducing the breakage in the subsequent process of the yarn. The quality of the winding directly affects the post-process. Therefore, the following requirements are imposed on the winding process:
(1) The package capacity of the package should be large to improve the production efficiency of the subsequent process; the package winding should be firm and strong for storage and transportation:
(2) A certain yarn tension should be maintained during the winding process to ensure that the package is well formed;
(3) It is necessary to facilitate the unwinding of the bobbin in the subsequent process to prevent the occurrence of the break-up on the knock-out;
(4) The knot of the yarn on the bobbin should be small and firm;
(5) Does not damage the original physical and mechanical properties of the yarn.
Warping: 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 warp yarns are used for sizing and piercing. Warping requires that the warp yarns have the same tension and are evenly distributed on the warp beam or weaving axis, and the color yarn arrangement conforms to the process regulations.
Piercing: The piercing is a general term for piercing and menstruation. Its task is to pass the warp yarn on the weaving shaft through the stop, heald and steel shovel in accordance with the rules of the machine. Wearing the knot is the last step in the preparation of the warp before weaving.
After the process: after the machine, mainly weft and warp weaving,
Opening - weft insertion - beating - winding - sending
Opening: The opening mechanism is generally composed of a lifting device, a returning device, and a control device for raising and lowering the heald frame (heald). In the shed structure, the front half of the shed is invariable, it is related to the weft insertion system, and the first half of the worm is required for the new weft insert. The length of the rear half of the shed directly affects the warp tension. Because of the low yarn strength, the silk loom requires a long shed.
Weft insertion: On the loom, the weft insertion is to introduce the weft yarn into the shed formed by the warp opening, so that the warp and weft are interlaced to form the fabric. The weft insertion method of the water jet loom uses water as the weft insertion medium, and the frictional traction force is generated on the weft yarn by the jet water flow, and the weft yarn on the fixed bobbin is introduced into the shed.
Beating: On the loom, relying on the reciprocating motion of the steel boring of the beating mechanism, pushing the weft yarn of one root into the shed to the woven mouth, interlacing with the warp yarn to form a fabric conforming to the design requirements is called a beating motion.
Coiling: After the weft yarn is driven into the weaving shed to form a fabric, the fabric must be continually drawn away from the woven mouth and wound onto a roll of rolls, called take-up.
Feeding: The warp yarn of the corresponding length is placed on the weaving shaft, so that the warp and weft yarns are continuously interlaced to ensure that the weaving production process continues, called delivery.
