Skeleton materials generally adopts copper coated steel wire, because this kind of widely used in tires, rubber hose, skeleton material strength is higher, and plentiful. But made of steel wire as skeleton material belt elongation, after using belt pitch elongation, lead to bad with gear, skip, damage of belt soon. Because the wire do skeleton materials can't meet the application requirement of synchronous belt, need to find new skeleton material. With the development of industrial technology, drawing, twisting, post-processing of glass fiber manufacturing process improvements, such as glass fiber cord made good performance, it has a high tensile strength, modulus, good heat resistance, good dimensional stability, small elongation, than steel wire and rubber adhesive, etc. Compared with steel wire synchronous belt, glass fiber rope synchronous belt can work in any climate, will not rust in wet conditions. In order to improve the resistance of glass fiber rope adhesive performance of the flexible and with rubber, butadiene, styrene, butadiene pyridine ternary copolymer latex or with chloroprene latex blend for impregnated glass fiber rope. But glass fiber rope also has many shortcomings, such as brittleness, and not twists and turns and resistance to impact load stability is poor, which often cause the use of synchronous belt to reduce reliability. Had someone with polyester, such as carbon fiber cord to try the synchronous belt tensile body material, the effects are bad. In recent years began to adopt synchronous belt of aramid cord do skeleton material. The tensile property of aramid fiber, bending performance, reverse all performance indicators were higher than the traditional synchronous belt skeleton material, it is bigger than intensity and density of small, this to improve the bearing capacity of the synchronous belt, reduce the weight of the synchronous belt, synchronous belt good runtime special centrifugal force and vibration. Aramid high modulus, low elongation and creep gives belt good dimensional stability, have used the elongation. Aramid high temperature resistant, zui high temperature can reach 240 ℃, 160 ℃ after 500 h under strong little drops, so is a good material for manufacturing belt. Now people have aramid 1414 as a skeleton materials used in synchronous belt.