皮革纹路分析（Leather pattern analysis）.docVIP

皮革纹路分析（Leather pattern analysis） Experience communication] identification of leather, classification and common defects I. The difference between leather, synthetic leather and transfer leather: Leather: refers to animal health group 2 after treatment of various finishing methods, the formation of relatively stable physical and chemical properties, good permeability and flexibility of the finished product. Imitation leather: a product made from a chemical process similar to natural leather. Transfer film leather: in the skin surface of the two layer by special finishing methods to create a false grain, or has made false particle mask affixed to the two layer of skin to imitate full grain or with special effect leather uppers. To distinguish between PU and PVC: on the back part of leather is a fiber layer or a sponge layer on the back of leather for natural meat surface; the back transfer film leather is also natural meat surface, but the surface of a leather composition, cross section has obvious stratification. Two. Classification of skin 1 Classification by surface condition 1) full grain leather: refers to the grain surface and natural pores remained intact, grain is clear, without modification of light grinding marks, uniform pores. 2) light repair skin: refers to the grain after light grinding, still visible natural pores and pore texture, but not full grain leather uniform, also called semi grain leather. 3) corrected: is the ground to reduce the impact of resultant leather part of grain, and specially modified method to create a fake grain, to imitate the full grain or with special effects vamp. 4) velvet skin: on the surface of the grinding of velvet like fine cashmere, soft feel. 5) suede leather: wear cashmere vamp on surface of the meat. 6) grind sand surface: Sandy, according to the size of the sand coarse sand and fine grinding sand. 2, according to the classification method of finishing 1) aniline leather: do not contain coverage and pigment paste fini