Leather is generally divided into: 1. Natural leather 2. Synthetic leather 3. Textile materials

Animal hide is a kind of natural leather, we usually call it real leather.

It is a fixed and durable substance transformed from animals (raw hides) through a series of physical and chemical treatments. It has softness, toughness, water deformation resistance, drying shrink resistance, heat and humidity resistance, and chemical resistance. With special advantages such as good air permeability and anti-aging properties, the processing of animal leather is very complex and requires dozens of steps to make the finished leather: raw leather - soaked in water - meat removed - degreasing ----Depilation - soaking - swelling - deliming - softening - pickling - tanning - cutting and shaving - tanning - neutralization - dyeing and oiling - filling - drying - finishing - finishing - finished product. There are also many types of animal hides. Depending on the material, there are usually sheep leather, cow leather, horse leather, snake leather, pig leather, crocodile leather, etc. Based on their properties, they can be divided into two layers of leather, full-grain leather and suede. . Modified leather, film leather, composite leather, decorative split leather, etc. Two-ply leather refers to crushed leather that is pressed chemically and physically during leather processing. This leather is relatively stiff, breaks easily, and does not stretch enough. Full-grain leather: refers to leather that retains and uses the original surface (growth or scaly surface) of animal skin, called ex-leather. Full grain is rarely used without finishing. Most of them are beautified and painted, such as embossed. The raw materials used for full-grain leather require high-grade raw materials with handicap and processing requirements. Leather, leather surface remains intact in leather and leather with good fastness, full grain leather surface is unpainted or painted and very thin, maintains the softness and elasticity of the leather and good breathability breathability and its finished comfort, Durable and beautiful. Suede: Refers to leather with a woolen surface, which is made by grinding the front side of the leather (the side where hair or scales grow) and is called nubuck​​​. Two-ply suede is called two-ply suede. Because suede is uncoated, it is more breathable and has increased flexibility. However, it has poor water resistance, dust resistance, and maintenance, and is free of particles. The fastness of plush leather is reduced. Suede leather products are comfortable to wear and have good hygiene properties. However, in addition to oil-tanned suede, suede is also prone to soiling and is difficult to clean and maintain. It is mainly used in the manufacture of leather shoes, leather garments, bags and gloves.

2. The surface of synthetic leather is mainly polyurethane, and the base material is non-woven fabric made of synthetic fibers, such as polyester, cotton and polypropylene.

Synthetic leather has a smooth surface, uniform thickness, uniform color and strength, and is superior to natural leather in terms of water resistance, acid and alkali resistance, and microorganisms. But it is not resistant to high temperature, high cold and not easy to age. Artificial leather is based on plain weave, canvas, rat weave, recycled fabric, fiber knitted fabric, etc., and then processed with different finish materials. Commonly used are: PVC artificial leather, PVC foam leather, textile materials including advanced canvas, cotton viscose blended fabric, vinylon cloth, plain weave, imitation cashmere and so on.

3. Textile materials generally refer to the textile fibers used in the textile industry and the general term for yarns and fabrics woven from the fibers.

The physical properties of textile materials mainly include: the constituent materials, internal shape, basic structure and shape of various textile materials, factors that affect the processing performance of textiles, wear and use functions, and factors that determine the quality of goods;