The basic common sense of sewing nylon thread, sewing thread is used to sew all kinds of garments, leather handbags, shoes and other sewing materials, and has a dual function of utility and decoration. The quality of the suture does not only affect the sewing effect and processing cost, but also affects the appearance of the finished product. Therefore, the general concept of the suture formation, the relationship between twist, strength and strength, suture classification, characteristics and main uses, and suture selection are used as references to facilitate the establishment of standards for the sutures and related tests. Determine the suture.

Sewing-bonded nylon thread — Apparel, leather handbags, footwear, sewing products, such as the general line of sewing.

Number of turns

Definition: Through the twisting of the fibrous structure of the wire, relative angular displacement between the cross-sections of the wire is produced, and the structure of the wire is changed by inclination of the straight fibers and the axis. Twisting can make the wire have certain physical and mechanical properties such as strength, elasticity, elongation, gloss and handfeel. It is expressed in terms of the number of turns per unit length, commonly used times per inch (T.P.I) or per meter. Number of times (T. P. M).
Roundabout: A 360 degree rotation around the axis.
Orientation (S-or Z-direction): When the sliver is vertical, the direction of the helix formed by the rotation around the axis. The tilt direction of the S direction is the same as that of the middle of the letter S, ie the right-hand direction or the clockwise direction. The z direction of the z direction is the same as the center of the letter Z, ie the left hand or counterclockwise.
The relationship between twist and strength: The twist of the thread is proportional to the strength, but after a certain degree of strength, the strength drops instead. If the enthalpy is too large, the yoke angle increases, the luster of the line is poor, and the hand feels bad. When the cymbal is too small, hairiness and feel are loose. This is due to increased twist, increased frictional resistance between fibers and increased strength of the wire. However, when the twist increases, the axial force component of the sliver becomes smaller, and the stress distribution of the inner and outer fibers is uneven, resulting in inconsistency of fiber breakage.
In short, there is a close relationship between the fracture performance, strength, and twist of the wire. The twist and twist direction are determined according to the needs of the finished product and post-processing, and are generally Z twist.
Polyester thread classification, characteristics and main use of LV bag network way
According to the raw materials, it can be divided into three categories: natural fiber sutured nylon thread, synthetic fiber sutured nylon thread and mixed sutured nylon thread.

1, natural fiber sewing nylon thread

Cotton Sewing-Polyester thread—-Sewing-Polyester thread made of cotton fiber as raw material by refining, bleaching, sizing and waxing. Cotton sewing thread can be divided into no light (or cord), light and wax light. Sewing thread is low in strength and poor in heat resistance and is not suitable for high-speed sewing. Mainly used in cotton fabrics, high temperature iron clothing seam is still winter and the disadvantage is poor elasticity and wear resistance.
Silk thread – long filament yarn or silk thread made from natural silk, has excellent gloss, its strength, flexibility and wear resistance are better than cotton. Suitable for sewing all kinds of silk clothing, high-grade woolen clothing, fur and leather clothing.

2, synthetic fiber sewing nylon thread

Polyester Sewing Polyester thread — Made of polyester filament or staple fiber, it has high strength, good elasticity, abrasion resistance, low shrinkage, and good chemical stability. However, the melting point is low, high-speed easy to melt, plug the eye, easy to break the line, should pay attention to the choice of machine needle. Mainly used for jeans, sportswear, leather products, woolen materials and military uniforms, etc. It is currently the most widely used and most popular sewing thread.
Nylon Sewing Polyester thread—made with pure nylon multifilament, divided into long thread, short fiber thread and elastic deformation line. At present, a long filament yarn is commonly used, which has a large elongation and good elasticity, and its tensile elongation at the instant of breaking is more than three times that of a cotton thread of the same specification. Used for sewing chemical fiber, wool, leather and stretch garments. The biggest advantage of the nylon sewing thread lies in its transparency. Because the thread is transparent and its color is good, the difficulty of sewing wiring is reduced, and the development prospect is vast. However, in the current market, the transparency of the transparent thread is too high, the strength is too low, the stitches are easy to float on the surface of the fabric, and in addition to the high temperature, the sewing speed cannot be too high. At present, these lines are mainly used as decals, edging, and other difficult parts.
Vinylon Sewing Polyester thread—made of vinylon fiber, with high strength and stable stitching, is mainly used for sewing thick canvas, furniture cloth, labor insurance products and so on.
Acrylic Sewing Polyester thread – made of acrylic fiber, with low twist and bright coloration, is mainly used for decoration and embroidery.

3, mixed polyester thread

Polyester-cotton Sewing-Polyester thread—made of 65% polyester and 35% cotton blended with the advantages of polyester and cotton. It has high strength, wear resistance, heat resistance and shrinkage, and is mainly used for cotton and polyester. High-speed sewing of various types of clothing such as cotton.
Core-wrapped polyester thread———filament is core, made of natural fiber, strength depends on the core, wear and heat resistance depends on the outer yarn, mainly used for high-speed and solid clothing sewing.