Composite film selection and determination of the coefficient of friction

1, printing in the choice of friction coefficient automatically printing film coil, general requirements are the lining of the small friction coefficient and the right outer friction coefficient, composite membrane outer friction coefficient is too big, can cause resistance in the process of printing is too big, cause the tensile deformation influence printing effect, if too small may cause drag institutions skid, causing correction system, reduce printing fastness, can also affect the packaging speed. In addition, the fineness of the ink is low, the pigment particle coarse, friction coefficient is big, in the process of printing plate printing resistance rate is low, also prone to paste version, when printing JiMo uneven ink and ink, cloth. Therefore, membrane surface should be smooth with suitable, for high speed printing, to ensure that the general requirements under normal temperature thin film on the surface of the friction coefficient at 0. 2 - 0. 4. 2, the determination of the coefficient of friction with the rapid development of gravure printing technology, printing speed is higher and higher, to avoid in the process of printing the waste caused by material causes friction coefficient to improve the production efficiency, printing film manufacturer must choose the appropriate friction coefficient, which requires the factory environment for appropriate film testing instrument. In front of the composite film printing not only to measure thin film materials at room temperature coefficient of friction, also should study in the actual use of the environment temperature coefficient of friction. 3 and the influencing factors of composite membrane friction coefficient formula 1 material formula of opening agent and smooth agent such as friction coefficient has a great impact on the material. The influence of the temperature of 2 3 parking time influence on friction coefficient of composite membrane after the curing chamber, it will reduce the friction coefficient, finally reached an equilibrium value. 4 the influence of the air contact we generally take a roll of film in the actual detection layer outside a few samples, but also the parking time to measure the composite membrane friction coefficient. Practice has proved by rewinding ( Stop after the cold) To reduce the friction coefficient of composite membrane, winding of loose film tend to be smaller friction coefficient. Five practice shows that the influence of corona treatment, corona treatment will make composite membrane friction coefficient increases. 6 is proved using the influence of polyether type binders will make composite membrane friction coefficient increases.