Woven fabric production process
one. Preparation before weaving of woven fabrics
Woven fabrics are formed by interweaving warp and weft yarns on a loom. During the weaving process, longitudinal and transverse friction and bending occur repeatedly between warp yarns, between warp and weft yarns, and between warp yarns and various objects on the loom. In order to make the yarn have sufficient strength, wear resistance and elasticity to ensure that the yarn will not break due to the above-mentioned various destructive forces during the weaving process; in order to reduce yarn defects and improve the smoothness to ensure that the weaving Production efficiency, to obtain excellent products; in order to increase the package length of the yarn and facilitate continuous production, the warp and weft yarns must be prepared before weaving to improve the process performance of the warp and weft yarns.
1. Winding
The winding process is carried out on the winding machine. Its task is to splice the spun yarn bobbins obtained in the spinning process, and in the process, ensure that the yarn obtains appropriate and uniform tension; according to the specified requirements, inspect and remove yarn defects such as thick details on the yarn. , impurities and dust, small and strong knots are formed during the cleaning process; it is rolled into a bobbin with uniform density, sufficient capacity, good shape, and easy unwinding.
2. Warping
Warping is performed on the warping machine. The task of the warping process is to draw out a piece of yarn from the bobbin on the creel behind the warping machine according to the number of warp yarns specified in the process design, and according to the length and width specified in the design, ensure that the yarn root and The tension between the roots, between the pieces, and between the front and back is uniform. If appropriate, the yarn pieces are wound in parallel into a well-formed warp beam.
3. Sizing
Sizing is a key process in the preparation before weaving, and is carried out on the sizing machine. The main task of the sizing process is to improve the weavability of the yarn, and at the same time, wind the sized yarn pieces into a well-shaped weaving beam under the condition of uniform tension, uniform arrangement and uniform winding density. Improving the weavability of yarns is mainly reflected in three aspects: First, enhancement – through sizing, part of the sizing liquid penetrates into the interior of the yarn, reducing the possibility of slippage between fibers inside the yarn, thereby increasing Yarn strength improves the ability to withstand tensile and impact loads. The second is to maintain stretch – during the sizing and drying processes, the elasticity and elongation of the yarn are maintained, so as to prevent the yarn from becoming brittle and stiff and increasing the breakage of the yarn during weaving. The third is to reduce friction – during sizing, a part of the slurry is covered on the surface of the yarn to form a layer of sizing film, and the hair on the surface of the yarn is attached to the yarn stem to reduce the friction between the yarns and the same friction between the yarns. The friction coefficient between machine parts improves the yarn’s ability to withstand friction.
4. Drawing in or tying
This is the last process of preparing the warp before weaving. The task of this process is to pass the yarns drawn from the weaving beam through the drop pieces, heald eyelets and reed teeth one by one according to a certain rule according to the requirements of the designed fabric, so that they can be opened into sheds during weaving. , incorporated into the weft yarn, and woven into a fabric with a certain width and warp density. The traditional drawing-in method is done manually with the help of semi-automatic machinery. When the production volume is large, an automatic warping machine can be used to automatically connect the warp yarns on the new and old weaving beams one by one to complete the warp drawing work.
5. Weft curling
Weft curling is the weft preparation process before weaving. The main task is to rewind the weft yarn package that has changed the shape of the package on the weft winding machine, so that it can meet the weaving requirements, have suitable density and good shaping, uniform tension, easy unwinding, and have a package that meets the requirements. At the same time, some yarn defects are removed to improve the quality of the weft yarn.
During the weaving process, when the weft yarn tension is too small and the weft yarn twist is large, or the weft yarn has a strong counter-twist force, weft shrinkage and looping may occur. In order to reduce or prevent the occurrence of the above disadvantages, in addition to reducing the twist of the weft yarn and increasing the tension of the weft yarn, moisture and heating are often used to set the twist of the weft yarn.
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