The twisted twist is directional, called the twist direction, that is, the inclined direction of the fiber in the twisted yarn or the inclined direction of the single yarn in the twisted strand. The twist direction is divided into Z twist and S twist. If the fiber in the single yarn or the single yarn in the strand is twisted, its inclination direction is from bottom to top, and from right to left is called S twist, also known as right-hand twist or right-hand twist; if the inclination direction is from bottom to top Above, from left to right is called Z twist, also known as left-hand twist or left twist. The method of expressing the twist direction is regulated. The single yarn can be expressed as: Z twist or S twist. In actual use, the single yarn mostly appears as Z twist; the twist direction of the strand can be the same or opposite to that of the single yarn The twist direction of both must be indicated, so it can be written as: the first letter indicates the twist direction of the single yarn, and the second letter indicates the twist direction of the strand. After two twisted strands, the third letter indicates the twist direction of the double twist. For example, if the single yarn is Z twist, the initial twist is S twist, and the double twist is Z twist, the twist direction is expressed as ZSZ twist. In fact, the twist direction of the strands is opposite to that of the single yarn, and the strength, luster, and hand feel are better. Therefore, the strands in actual use are mostly S twists.
The twist direction of the yarn has a great influence on the look and feel of the fabric. Reasonable use of twist direction can obtain fabrics with various ideal appearance effects. For plain weave fabrics, if the warp and weft yarns are twisted in different directions, the surface of the fabric will reflect light uniformly, the gloss will be better, and the fabric will be bulky and soft. For twill fabrics such as gabardine, when warp yarns use S twist and weft yarns use Z twist, since the twist direction of warp and weft yarns is perpendicular to the twill direction of the fabric, the reflection direction is consistent with the twill lines, so the lines are clear. And when several S-twisted and Z-twisted yarns are arranged alternately, the fabric can produce a hidden stripe effect, just like some tweed clothing materials. Of course, when yarns with different twists are twisted together to form a fabric, a ripple effect will be produced.
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