Basic knowledge of polyester

　22.8*2(50S/2)Y=9144MT shirt, thin fabric, sand washed, silk.

　9.8*2(60S/2)5000Y=4572M thin fabric, overlapping, Handkerchief.

　9.8*3(60S/3)3000Y=2743MGeneral fashionFabrics, various knitted fabrics, quilt covers, sheets, sportswear.

7.4*3(80S/3)3000Y=2743M high-end shirts, high-end ethnic clothing.

Pure cotton sewing thread 9.8*3(60S/3)3000Y=2743M) Knitted garment overlock sewing thread

Polyester high-strength (Puqiang) sewing Sewing thread 150-300D*2100-460g row sewing, leather sewing thread, buttonhole, overlock thread.

Thread is usually made of several strands of yarn twisted side by side. Sewing thread model The first 20, 40, 60, etc. all refer to the yarn count. The yarn count can be simply understood as the thickness of the yarn. The higher the count, the thinner the yarn; the 2 and 3 after the model refer to the sewing thread made of. Several strands of yarn are twisted together. For example: 603 is made of 3 strands of 60 count yarn twisted together. Therefore, the higher the count of a sewing thread made by twisting yarns with the same number of strands, the thinner the thread and the lower the strength; while the sewing thread made by twisting yarns with the same number of strands, the higher the number of strands, the thicker the thread and the stronger the strength. big.

Line thickness comparison: 203>202>403>402>603>602

Line strength comparison is similar to line thickness! Concept (polyester): 1.

Polyester is an important variety of synthetic fibers and the trade name of polyester fiber in my country. It is a fiber-forming polymer made from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation reaction – -Polyethylene terephthalate (PET), a fiber produced by spinning and post-processing. Overview in English: Terylene polyester

2. The so-called polyester filament is a filament with a length of more than one kilometer, and the filament is wound into a ball. Polyester staple fiber is a short fiber of several centimeters to more than ten centimeters.

Polyester has a wide range of uses and is widely used in the manufacture of clothing fabrics and industrial products. Polyester has excellent shaping properties. Performance

　1. High strength. The strength of short fiber is 2.6~5.7cN/dtex, and the strength of high-strength fiber is 5.6~8.0cN/dtex. Due to its low hygroscopicity, its wet strength is basically the same as its dry strength. The impact resistance is 4 times higher than nylon and 20 times higher than viscose fiber. 2.

Good elasticity. The elasticity is close to that of wool. When stretched by 5% to 6%, it can almost completely recover. The wrinkle resistance is better than other fibers, that is, the fabric does not wrinkle and has good dimensional stability. The elastic modulus is 22~141cN/dtex, which is 2~3 times higher than nylon.

3. Heat resistance and thermal stability are the best among synthetic fiber fabrics.

　

　4. The surface of polyester is smooth and the internal molecules are tightly arranged.

5. Good wear resistance. The wear resistance is second only to nylon with good wear resistance, and is better than other natural fibers and synthetic fibers.

6. Good light resistance. Lightfastness is second only to acrylic.

7. Corrosion resistance. Resistant to bleach, oxidants, hydrocarbons, ketones, petroleum products and inorganic acids. Resistant to dilute alkali and not afraid of mold, but hot alkali can cause it to decompose.

8. The dyeability is poor, but the color fastness is good and it is not easy to fade. The major categories of polyester include short fiber, drawn yarn, textured yarn, decorative filament, industrial filament and various differentiated fibers.

　3.

Sewing thread is the thread required for knitted clothing products. According to raw materials, sewing thread can be divided into three categories: natural fiber sewing thread, synthetic fiber sewing thread and mixed sewing thread. kind. With the development of the polyester industry, more and more pure polyester fibers are used as raw materials for sewing threads. Polyester fiber is a high-quality synthetic fiber. The sutures made from it have high strength, ranking second only to nylon threads among various types of sutures, and the strength will not be reduced when wet. Its shrinkage rate is very small, and the shrinkage is less than 1% after proper shaping, so the stitches sewn can always remain flat and beautiful, without shrinkage. The wear resistance is second only to nylon. It has low moisture regain and good high temperature resistance, low temperature resistance, light resistance and water resistance. Therefore, polyester thread is an extremely widely used variety and has replaced cotton sewing thread in many occasions. Polyester thread has a wide range of uses. It can be used for garment sewing of cotton fabrics, chemical fiber fabrics and blended fabrics, and can also be used to sew knitted outerwear. Special polyester thread is also an excellent thread for the shoe and hat leather industry.

Basic knowledge of cotton thread:

The concept of yarn and strand: There are many kinds of thread according to different spinning methods. Short fibers such as cotton, silk, and linen are made into a single yarn through the spinning process, and then several strands of yarn are combined to make a thread called spinning thread. The strength of a single strand of yarn is often not enough. Two or more strands of single yarn are combined and twisted and are called strands.

Industry standard: Cotton thread is divided into two types: glazed and non-glazed. Its packaging forms include straight shaft type, tower shaft type, etc. Binding threads are mostly of the tower type. There are four types of specifications according to professional standards: 42-count yarn with 4 strands, 42-count yarn with 6 strands, 60-count yarn with 4 strands, and 60-count yarn with 6 strands of white wax tower thread. The models are: S424, S426, S604, S606, can also remember 42S/4,42S/6,60S/4,60S/6. Among them, S represents the yarn count, and the number under the slash represents the number of strands.