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Woolen fabric is a general term for fabrics woven from various types of wool and cashmere. It is usually used to make formal and high-end clothing such as dresses, suits, and overcoats. Its advantages are anti-wrinkle and abrasion resistance, soft hand feeling, elegant and crisp, full of elasticity and strong warmth retention. Its main disadvantage is that it is difficult to wash and is not suitable for making summer clothes.

Woolen coats made of good woolen fabrics are soft and clean, with a smooth and oily feel, and can also be divided into many types: for example: pure woolen woolen cloth and chemical fiber woolen cloth, there is a clear difference in appearance: pure wool color and luster Soft and shiny, chemical fiber has a darker luster; pure wool has a soft touch, while chemical fiber is stiff and not soft; pure wool has good elasticity and good recovery, while chemical fiber has obvious creases after grasping and relaxing.

The meaning of polyester is polyester. Polyester fiber is an important variety of synthetic fibers, and it is the trade name of polyester fiber in my country. Fiber made by spinning and post-processing.

The advantages are:

1. high strength. The short fiber strength is 2.6～5.7cN/dtex, and the high tenacity fiber is 5.6～8.0cN/dtex. Due to its low hygroscopicity, its wet strength and dry strength are basically the same.

2. Good flexibility. The elasticity is close to that of wool, and it can almost completely recover when it stretches 5% to 6%. The wrinkle resistance exceeds other fibers, that is, the fabric does not wrinkle and has good dimensional stability.

3. Heat-resistant polyester is made by melt spinning, and the formed fiber can be heated and melted again, which is a thermoplastic fiber. The melting point of polyester is relatively high.

4. Good thermoplasticity and poor melting resistance. Because polyester has a smooth surface and tightly arranged internal molecules, polyester is the most heat-resistant fabric among synthetic fabrics. It is thermoplastic and can be made into pleated skirts with long-lasting pleats.

5. Good abrasion resistance. The abrasion resistance is second only to nylon, which is the best in abrasion resistance, and is better than other natural fibers and synthetic fibers.

6. Good light resistance. Lightfastness is second only to acrylic fiber. The light fastness of polyester fabric is better, except that it is worse than acrylic, its light fastness is better than natural fiber fabric. Especially the light fastness behind the glass is very good, almost as good as acrylic.

7. preservative. It is resistant to bleaching agents, oxidants, hydrocarbons, ketones, petroleum products and inorganic acids. It is resistant to dilute alkali, not afraid of mildew, but hot alkali can make it decompose. It also has strong resistance to acid and alkali, and UV resistance

The disadvantages are:

1 Poor dyeability, but good color fastness, not easy to fade. Because there is no specific dyeing group on the molecular chain of polyester, and the polarity is small, it is difficult to dye, the dyeability is poor, and the dye molecules are not easy to enter the fiber.

2. Poor hygroscopicity, sultry feeling when wearing, and easy to be charged with static electricity and dirt, which affects appearance and comfort. However, it is very easy to dry after washing, and the wet strength hardly drops, does not deform, and has good wash and wear properties.

Modacrylic is a modified polyacrylonitrile fiber.
Modacrylic fibre modacrylic fibre is also known as modified polyacrylonitrile fibre. Synthetic fiber made of linear polymer copolymer containing 35% to 85% of acrylonitrile monomer. The American Union Carbide Company began industrial production in 1948 under the trade name Dynel.

There are two main types of modified polyacrylonitrile fibers that are industrially produced recently: fibers made from copolymers of acrylonitrile and vinyl chloride; fibers made from copolymers of acrylonitrile and vinylidene chloride, namely, polyacrylonitrile fiber. These two types of modified polyacrylonitrile fibers are sometimes collectively referred to as acrylonitrile fibers, which have good flame resistance.

Synthetic fiber classification:

1. Classified by structure:

1. Carbon chain synthetic fibers, such as polypropylene fiber (polypropylene fiber), polyacrylonitrile fiber (acrylic fiber), polyvinyl formal fiber (vinylon).

2. Hetero-chain synthetic fibers, such as polyamide fiber (nylon), polyethylene terephthalate (polyester), etc.

2. Classified by function:

1. High-temperature resistant fiber, such as polybendazole fiber

2. High temperature corrosion resistant fiber, such as polytetrafluoroethylene.

3. High-strength fibers, such as poly-p-phenylene terephthalamide.

4. Radiation resistant fiber, such as polyimide fiber.

5. In addition, there are flame retardant fibers, polymer optical fibers, etc.

1. The difference between leather

(1) Touch by hand: touch the surface of the leather with your hand. If it feels smooth, soft, plump, and elastic, it is real leather; the surface of artificial synthetic leather is astringent, rigid, and has poor flexibility.

(2) Seeing: The real leather has clear hairs and patterns, yellow cowhide has relatively well-proportioned fine pores, yak cowhide has coarser and sparse pores, and goat skin has scaly pores.

(3) Smell: All leather has the smell of leather; and artificial leather has a strong irritating plastic smell.

(4) Ignite: tear off a little fiber from the back of real leather and artificial leather. After lighting, it emits a pungent odor. The lumps are the artificial leather; the hair odor and the lumps are not formed by the leather.

How to care for and maintain leather bags?
1. It cannot be irradiated under strong light or placed in strong acid.
2. Wipe dry when exposed to rain and put it in a ventilated place to dry.
3. After the leather bag becomes moldy, wipe it dry with a soft cloth, and then apply care agents such as Bi Lizhu.
4. When there are ballpoint pen marks on it, milk can be used to clean it.