The wrinkles of twisted fabrics refer to the wrinkles in the weft direction of the fabric. The joints can be found at one end of the joints, and the occurrence rate of fabric is higher at the joints. When fabric wrinkles occur, it not only seriously affects the quality of the finished product, but also brings many unfavorable factors to subsequent printing and dyeing processes.
Wrinkle The mechanism of the stall is that when the double-twisted H tube is heat-set in vacuum, the outer layer of the twisted wire and the inner layer of the twisted wire shrink unevenly. The inner layer of wire cannot shrink because it is close to the hard metal core; To the outer layer, the shrinkage rate is greater. When rewinding, the outermost silk thread is usually connected to the innermost silk thread of the previous H tube, that is, the two sections of silk threads with greatly different shrinkage are closely connected together for weft insertion. This difference in the shrinkage of the silk threads is reflected in the blank silk. There is almost no effect on the dyeing process, but once the high-temperature treatment is carried out after dyeing, the wrinkle effect will be obvious.
Take the following measures to prevent wrinkles from occurring.
(1) Cover the double-twisted H tube core with corrugated paper, relying on its relatively good elasticity to reduce the shrinkage difference between the inner and outer layers of wires.
(2) On the premise of ensuring the normal efficiency of the loom, lower the setting temperature and shorten the setting time as much as possible to reduce the shrinkage of the yarn.
(3) Under the premise of production permission, try to reduce the yarn capacity of the H tube to relatively reduce the shrinkage of the outer silk thread. It is recommended to use a yarn capacity of about 550g.
(4) The single-twist weft yarn is inserted using a double-jet loom, so that the two yarns with drastic changes in shrinkage can be staggered as much as possible to reduce the degree of wrinkles.
(5) When designing the fabric, slightly reduce the reed width. The width is recommended to be about 3~4cm. During post-printing and dyeing processing, the width should be uniformly widened to physically Reduce or eliminate wrinkles, but this will have an impact on the fabric style.
(6) If conditions permit, half of the twice-twisted H tube can be re-winded, and then the other half of the H-tube can be arranged in a 1:1 arrangement and poured into weft yarn Bobbin, so that the outer layer of the H tube is connected to the outer layer, and the inner layer is connected to the inner layer, which can eliminate the factor of sudden change in the shrinkage rate of the silk thread.
(7) During the fabric dyeing process, the heat preservation time should be extended as much as possible to make the twisted silk threads shrink as much as possible, which can also alleviate the symptoms of wrinkles.
(8) In short, appropriate measures should be selected to solve this problem according to different varieties and production technology and equipment conditions.
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