Many products in life need to be sewn with polyester bonded thread. Although the sewing thread is a small thread, it plays a big role. Sewing thread is the thread required for knitted clothing products. Sewing thread can be divided into three categories according to raw materials: natural fiber, synthetic fiber sewing thread and mixed sewing thread. The polyester bonded thread uses pure polyester fiber as its raw material. Polyester bonded thread refers to: sewing thread produced with polyester as raw material. The following will introduce the quality and application of polyester sewing thread.

The comprehensive index for evaluating the quality of polyester bonded thread is seamability. Sewingability refers to the ability of a sewing thread to sew smoothly and form a good stitch under specified conditions, and maintain certain mechanical properties in the stitch. The pros and cons of sewability will have a direct impact on garment production efficiency, sewing quality and wearing performance. According to the national standards, the grades of sewing threads are divided into first-class, second-class and foreign-class products. In order to make the sewing thread have the best sewability in garment processing and the sewing effect is satisfactory, it is very important to select and apply the sewing thread correctly. The correct application of sewing thread should follow the following principles:

(1) Compatible with the characteristics of the fabric: The polyester bonded thread is the same or similar to the raw material of the fabric, so as to ensure the unity of its shrinkage rate, heat resistance, wear resistance, durability, etc., and avoid the appearance shrinkage caused by the difference between the thread and the fabric. 

(2) Consistent with the type of clothing: For special-purpose clothing, polyester bonded thread with special functions should be considered, such as elastic sewing thread for elastic clothing, and heat-resistant, flame-retardant and waterproof sewing thread for fire-fighting clothing.

(3) Coordinate with the shape of the stitches: the stitches used in different parts of the garment are different, and the polyester bonded thread should also be changed accordingly. Crotch and shoulder seams should be firm, while buttonhole lines should be durable.

⑷Unify with quality and price: The quality and price of polyester bonded thread should be unified with the grade of clothing. High-grade clothing should use sewing thread with good quality and high price, and medium and low-grade clothing should use sewing thread with average quality and moderate price.

Generally, the grade of the sewing thread, the raw material used, the fineness of the yarn count, etc. are marked on the label of the polyester bonded thread, which helps us to choose and use the sewing thread reasonably. Sewing thread labels usually include four items (in order): yarn thickness, color, raw materials, and processing methods.