Material Friction Coefficient and Temperature （材料的摩擦系数和温度）.pdf

Material Friction Coefficient and Temperature Abstract: this article briefs on the influence of temperature fluctuation on friction coefficient of material. It also analyzes the actual testing requirements on film friction coefficient in actual application. Key words: friction coefficient, temperature, and mucosity. 1. Friction Coefficient The coefficient of friction is a measurement of frictional force between two surfaces. It is an index of friction behavior of the material. Film friction coefficient depends on the superficial adhesivity (surface tension and crystallinity), additive (smooth agent, pigment, etc.), and surface polishing. Friction coefficient should be controlled strictly in the following operational sequence: film crossing free roller, bags of shaping, products twine and the stacking of package and other containers. Besides the internal variable factors, environmental factors (such as running speed, temperature, static accumulate, and humidity of the machine) can also influence the test result of friction coefficient. 2. Influence of Temperature on Friction Coefficient The state change of molecule motion of high polymer is called laxation according to the view of dynamics. The rising of temperature can improve heat movement ability of moving units on the one hand. On the other hand, because of thermal expansion, it increases molecule distance. Namely the internal freedom volume within the high polymer increases, which can increase activity space of moving unit, accelerate molecule movement, shorten relaxation time and expedite relaxation process. Following the relaxation of high polymer, its thermodynamics nature, viscoplasticity and other physical properties will also change dramatically. As one of the most frequently used indexes of mechanics, friction coefficient can also be influenced by the increase of temperature. Generally speaking, with the rising of environment temperature, surface fr