Nantong Rongdu Thread Co., Ltd.
Nantong Rongdu Thread Co., Ltd.

Analysis of Polyester Sewing Thread Manufacturing Process

There are five types of sewing thread classified by the raw material used: cotton thread, pure cotton thread, continuous filament polyester thread, polyester-cotton blended thread, and nylon thread. Most of the sewing threads are made of pure polyester fiber. To produce polyester thread, it needs to go through six processes: carding, winding, combing, assembling, twisting, and winding.

Types of sewing thread

Cotton thread

Cotton thread has good heat resistance, but poor elasticity, wear resistance, moisture resistance, and antibacterial ability. It is suitable for high-speed sewing and durable ironing. The most commonly used is the long-staple cotton thread, which is made of long-staple cotton and processed by carding, singeing, and silk finishing. And it has high density and twist, so the tension is better than ordinary combed cotton. Pure cotton thread is often used for pure cotton clothing and other pure cotton fabrics.

Pure cotton thread

Pure cotton thread is generally divided into ordinary combed and fine combed parts. The real 100% pure cotton thread that can be used for sewing is the full-fine combed cotton. Generally, 402, 202, and 203 are commonly used. It is made of high-quality cotton from cotton areas by combing and singeing. Pure cotton thread is often used for pure cotton clothing and other pure cotton fabrics for sewing.

Polyester sewing thread

Polyester thread has high strength, flat and beautiful seam, wear resistance, and is not susceptible to mildew or rot. It has a low price, rich colors, is not easy to fade or wrinkle.

Polyester-cotton blended thread

It is made of 65% polyester short fiber and 35% cotton fiber. The thread has high strength, good wear resistance, low shrinkage, good flexibility and elasticity, and good heat resistance. It can be used to sew various clothes.

Nylon thread

Heavy duty nylon thread has high tensile strength and elasticity, smooth texture and silk luster, and excellent wear resistance.

Production process of polyester sewing thread

1. Carding and winding: Pour polyester fibers into the disc, and then agitate and combine the regular fibers into a bulky fiber block.

2. Combing and assembling: The large block of fibers is further combed and assembled by the combing machine to form small strips of fibers.

3. Coarse and fine yarns: The strip fibers are adjusted to the required yarn count by the rough and fine yarn machine.

4. Assembling and twisting: The spinning machine twists the single yarns into required plies.

5. Winding and unwinding: The ply yarns are made into twisting or cylindrical yarns.

6. Dyeing and packaging: Dye according to the customer's required color and packaging for sale.

Sewing thread refers to the thread used to stitch textiles, plastic, leather products, and binding books and periodicals. Heavy duty sewing thread has the characteristics of sewability, durability, and appearance quality. It is classified into sewing thread, embroidery thread, and industrial thread according to usage, and three major categories of natural fiber sewing thread, synthetic fiber sewing thread, and blended fiber sewing thread according to the raw material used. With the development of the polyester industry, more and more sewing threads are made of pure polyester fiber as raw materials.