After determining the front and back sides of the fabric, it is necessary to determine which direction in the fabric is warp yarn and which direction is weft, which is a prerequisite for analyzing items such as fabric density, warp and weft characteristics, and fabric structure.
The main basis for distinguishing the warp and weft direction of the fabric is as follows.
1. If the sample of the fabric to be analyzed is cloth-edged, the yarn parallel to the cloth edge is the warp yarn, and the yarn perpendicular to the cloth edge is the weft yarn.
2. Warp yarn containing pulp, weft yarn without pulp.
3. Generally, the side with high fabric density is warp yarn, and the side with low density is weft yarn.
4. For fabrics with obvious reed marks, the direction of the reed marks is the warp direction of the fabric.
5. When one of several yarns in the fabric is strands, and the other group is a single yarn, the strands are usually warp yarns and the single yarn is a weft yarn.
6. If the twisting direction of the single yarn fabric is not the same, the Z twist yarn is the warp direction and the S twist yarn is the weft direction.
7. If the twist degree of the fabric yarn is different, most of the twist degree is the warp direction, and the small twist degree is the weft direction.
8. If the warp and weft characteristics of the fabric, twist direction, twist direction are not much different, then the yarn is uniform and the luster is better for the warp
9. Towel fabrics, the yarn of the terry is warp, and the yarn without the loop is the weft yarn.
10. Strip fabric, the direction of the strip is usually warp.
11. If the fabric has a systematic yarn with a variety of different characteristics, this direction is the warp direction.
12. Leno fabric, twisted yarn is warp, non-twisted yarn is weft.
13. In the interweaving of different raw materials, the general cotton wool is a fabric interwoven with cotton and linen, and cotton is warp; In the wool interwoven fabric, the silk is warp; In the wool cotton interwoven fabric, silk, cotton is warp; In the interwoven fabric of natural silk and silk, natural silk is warp yarn; In the intersection of natural silk and rayon, the natural silk is warp.
Due to the extremely wide range of uses of fabrics. Therefore, the requirements for fabric raw materials and organizational structure are also diverse, so when judging, it is necessary to determine according to the specific situation of the fabric.
