(1) If the identified fabric has a selvage, the yarn direction parallel to the selvage is the warp direction, and the other is the weft direction.
(2) The sizing is the side of the warp yarn, and the side that is not sized is the side of the weft.
(3) Generally, the fabric with the highest density is the warp direction, and the fabric with the lowest density is the weft direction.
(4 For fabrics with obvious reed marks, the direction of the reed marks is the warp direction.
(5) For half-line fabrics, usually the direction of the strands is the warp direction, and the direction of the single yarn is the weft direction.
6) If the twist and draw of the single yarn fabric is different, the Z twist direction is the warp direction, and the S twist direction is the weft direction.
(7) If the warp and weft yarn characteristics, twist direction and twist of the fabric are not very different, the warp direction is the one with uniform yarn evenness and better luster.
(8) If the yarn twist of the fabric is different, most of the twist is the warp direction, and the small twist is the weft direction.
(9) Towel-like fabrics, the yarn direction of the loops is the warp direction, and the yarn direction without loops is the weft direction.
(10) Sliver fabric, the sliver direction is usually the warp direction.
(11) If the fabric has a system of yarns with a variety of different properties, this direction is the warp direction.
(12) For leno fabrics, the direction of the twisted yarn is the warp direction, and the direction of the untwisted yarn is the weft direction.
(13) In the interweaving of different raw materials, a strand of cotton wool or cotton and linen interwoven fabric, cotton is the warp; in the wool-silk interwoven, the silk is the warp; in the wool-silk-cotton interlace, the silk and cotton are the warp; natural silk In the interweaving with spun silk, the natural thread is the warp; in the interweaving of natural silk and rayon, the natural silk is the warp. Due to the wide range of uses and varieties of fabrics, the requirements for fabric raw materials and organizational structure are also diverse, so when judging, it should be determined according to the specific conditions of the fabric.