1. Hand visual inspection method: This method is suitable for textile materials in loose fiber state.
(1) Cotton fiber is shorter and thinner than ramie fiber and other hemp fiber and wool fiber, and often has various impurities and defects.
(2) The hemp fiber feels rough and hard.
(3) The wool fiber is curly and elastic.
(4) Silk is long and slender, with special luster.
(5) Among chemical fibers, only visغير مجاز مي باشدe fibers have a large difference in strength between dry and wet states .
(6) Spandex yarn has very large elasticity, and its length can be stretched to more than five times at room temperature.
2. Microscope observation method: It is to identify fibers based on their longitudinal and cross-sectional morphological characteristics.
(1) Cotton fiber: cross-sectional shape: round waist with middle waist; longitudinal shape: flat ribbon shape with natural twist.
(2) Hemp (ramie, flax, jute) fiber: cross-sectional shape: round or polygonal waist, with a middle cavity; longitudinal shape: horizontal nodes, vertical lines.
(3) Wool fiber: cross-sectional shape: round or approximately round, some with pith; longitudinal shape: scales on the surface.
(4) Rabbit hair fiber: cross-sectional shape: dumbbell-shaped with hair pith; longitudinal shape: scales on the surface.
(5) Mulberry silk fiber: cross-sectional shape: irregular triangle; longitudinal shape: smooth and straight, with stripes longitudinally.
(6) Ordinary visغير مجاز مي باشدe fiber: cross-sectional shape: zigzag, skin-core structure; longitudinal shape: longitudinal grooves.
(7) Rich and strong fiber: cross-sectional shape: less tooth shape, or round or oval; longitudinal shape: smooth surface.
(8) Acetate fiber: cross-sectional shape: trilobal or irregular zigzag shape; longitudinal shape: longitudinal stripes on the surface.
(9) Acrylic fiber: cross-section shape: round, dumbbell or leaf shape; longitudinal shape: smooth or striped surface.
(10) Chlorine fiber: cross-sectional shape: close to circular; longitudinal shape: smooth surface.
(11) Spandex fiber: cross-sectional shape: irregular shape, round, potato-shaped; longitudinal shape: dark and deep surface, showing unclear bone-shaped stripes.
(12) Polyester, nylon and polypropylene fibers: cross-sectional shape: round or special shape; longitudinal shape: smooth.
(13) Vinylon fiber: cross-sectional shape: round waist, skin-core structure; longitudinal shape: 1 to 2 grooves.

Mousse fabric:
3M Waterproof Mousse Cloth: The fabric adopts the latest modern technology-"new synthetic fiber" that is a high-density fabric woven with superfine fibers as raw materials, soft, smooth and delicate; the fabric has countless times more fine hairiness than ordinary fabrics , The surface area and micropores are countless times higher, so the fabric has great dust holding, oil removal and decontamination capabilities. The fabric also uses the latest 3M brand-name waterproof glue from the United States. After special processing, the molecular micro-materials of the 3M glue penetrate into the fibers of the fabric, which not only has good waterproof performance, but also does not affect the breathability and moisture permeability of the fabric. The fabric is popular in Europe and America and is widely used in clothing.
Its characteristics: the appearance is fine and clean, plump, with a slight velvet feeling, but no fluff can be seen by the eyes; the gloss is soft and elegant; the hand feels soft, smooth and delicate; the touch is warm; the cloth body is fluffy and elastic. Dry clean carefully and do not wring out.
TENCEL fabric:
Tencel, a new kind of visغير مجاز مي باشدe fiber, also known as LYOCELL visغير مجاز مي باشدe fiber, its trade name is Tencel.
Tencel is prepared by solvent spinning technology based on ammonium oxide, which is completely different from the previous visغير مجاز مي باشدe fiber preparation method. Because of the solvent spinning technology, it is completely different from the previous visغير مجاز مي باشدe fiber preparation method. Because the solvent can be recycled and is not harmful to the ecology, it is also called the 21st century visغير مجاز مي باشدe fiber. Tencel's ingredient is fiber diesel, and its production raw materials are trees in nature.
The main feature of Tencel is: high wet strength (higher than cotton fiber) wet modulus is also higher than cotton. It has good moisture absorption of visغير مجاز مي باشدe fiber and high strength like synthetic fiber. Tencel fabric has good dimensional stability, low washing shrinkage, soft fabric and silky luster. When there is a temperature, the Tencel fabric will expand. It acts like a barrier. It can prevent the intrusion of rain and snow while still maintaining its breathability. The silk fabric has the same comfort as natural fibers. The garments made of Tencel are compliant and can be washed in many ways, and they remain soft and will not change shape. Hand wash, do not use bleach, dry in the shade, do not wring out.
 Composite fabric:
Composite fabric is a kind of special textile processing and unique dyeing finishing using superfine fibers, and then processed by "composite" equipment. The composite fabric uses the "new synthetic fiber" high technology and new materials, and has many excellent properties (compared with ordinary synthetic fibers), such as the fabric performance is fine and clean, delicate, elegant, and warm, and the fabric appearance is full, windproof and breathable. It has a certain waterproof function, and the fabric has good warmth retention.
Because the composite fabric uses superfine fibers, the fabric has a high cleaning ability, that is, decontamination ability. Another feature of the fabric is: good abrasion resistance, the microfiber fabric is soft, breathable, and moisture permeable, so it has obvious advantages in terms of touch and physiological comfort, and the microfiber fabric has poor wrinkle resistance (this It is caused by soft fibers and poor elastic recovery after creasing); in order to overcome this shortcoming, a "composite" process was adopted, which greatly improved the shortcomings of poor wrinkle resistance of ultra-fine fiber fabrics. Composite fabrics are currently popular jacket fabrics in Europe and America.
Features: warm and breathable

The coating method of PU coated fabric should be selected according to product requirements. Common coating methods are as follows.

① Dry method. This method is a traditional process, the method is relatively simple, as long as the PU coating agent is diluted with solvent or water according to the required concentration, and the necessary agents and colorants are added to prepare the PU coating slurry, and the coating is evenly coated on the substrate with a coater. The cloth is dried and baked to evaporate the solvent or water to form a tough film on the base cloth.The technological process is: base fabric winding → coating → drying → rolling (or embossing) → cooling → finished product winding.

② Wet method. Dissolve PU coating agent (such as polyurethane) with dimethylformamide (DMF) to make PU coating slurry. After coating, immerse in water to form a solidified film. Because DMF can be infinitely miscible with water, DMF dissolves in water, while polyurethane is insoluble in water, its concentration increases rapidly, and finally is deposited on the base fabric. During the solidification of the PU coating, due to the effect of the semipermeable membrane, DMF exudes sharply from the polyurethane, resulting in channel micropores perpendicular to the surface of the film. Therefore, the surface of the polymer film is porous. If the diameter of these micropores is manipulated within 0.5-5 μm, it can be made into a rainproof cloth that is both breathable, water-repellent and breathable. The process flow of wet PU coating is: base fabric roll-up → coating → immersion in an aqueous solution to solidify → drying → cooling → finished product roll-up.

③Melting method. It uses thermoplastic resin as a PU coating agent to be heated and coated on the base fabric. When it is ready to be used, it is heated with a hot pressing roller or an iron to make the dot, line or network resin coated on the base fabric again Melt and bond to the finished fabric, often used to bond collar linings. The process flow depends on the coating method, the common ones are as follows.

a. Dusting method. It uses electromagnetic vibration device for powdered resin to evenly sprinkle the powder on the surface of the base cloth, and then fix it in a non-contact oven (or infrared tube). This method commonly used ethylene vinyl acetate PU coating agent, referred to as EVA interlining finishing.

b. Powder dot method. Coating is carried out on a combination of two hot rollers and one engraving roller. The upper part of this kind of engraving roller has PU coating agent and a scraper. The resin falls into the negative groove of the engraving roller. The fabric heated by the roller can reach a temperature of 160～180℃. Transfer of powder into dots. The temperature of the hot roller is controlled at 160～240℃, the transfer temperature of nylon powder is around 55℃, and the temperature of polyethylene powder is around 95℃.

c. Pulp point method. Mainly used for non-woven fabrics, the basic process is the same as rotary screen printing.

④ Transfer film forming method. It is to first coat the PU coating slurry on the transfer paper or metal belt pretreated with silicone, and then superimpose the base cloth and the transfer paper face-to-face and transfer to the base cloth by a pressing roller. After cooling, the transfer paper Serve separately with finishing fabric. This method is mainly used for a kind of fabric with light and loose structure and sensitive to tension, such as leno, knitted fabric, non-woven fabric, etc. The drying device of the whole machine is conveyed by mesh belt.