The full name of aramid fiber is "aromatic polyamide fiber", which refers to a long-chain synthetic polyamide fiber in which more than 85% of the amide bonds are directly connected to the benzene ring, high temperature resistance, high strength, high modulus, insulation and other outstanding properties, It is a new type of special polymer material. At present, there are two kinds of aramid fibers on the market that have achieved a wide range of commercial applications and production, namely meta-aramid and para-aramid.