1. Selection of friction coefficient in printing
Film rolls for automatic printing generally require a smaller coefficient of friction in the inner layer and a suitable coefficient of friction in the outer layer. The friction coefficient of the outer layer of the composite film is too large, which will cause excessive resistance during the printing process and cause tensile deformation of the material to affect the printing If the effect is too small, it may cause the drag mechanism to slip, resulting in inaccuracy of the correction system, reduced printing fastness, and affecting the packaging speed. In addition, the fineness of the ink is low, the particles of the pigment are coarse, the coefficient of friction during printing is large, and the printing durability of the printing plate is low. It is also easy to produce scumming, ink accumulation, and uneven ink transfer and ink distribution during printing. Therefore, the film surface should have appropriate smoothness to ensure its high-speed printing, and the dynamic friction coefficient of the film surface is generally required to be between 0.2-0.4 at room temperature.
2. Determination of friction coefficient
With the rapid development of gravure printing technology, the printing speed is getting higher and higher. In order to avoid the waste caused by the friction coefficient of the material in the printing process and improve the production efficiency, the printing manufacturer must choose the appropriate friction coefficient film, which requires the factory environment to prepare Appropriate thin film testing equipment. Before the composite film is printed, not only the friction coefficient of the film material at normal temperature should be measured, but also the friction coefficient at the actual use ambient temperature should be studied.
3. Factors affecting the friction coefficient of the composite film
1 The recipe of the material
The opening agent and slip agent in the material formula have a great influence on the friction coefficient of the material.
2 Influence of temperature
3 Impact of parking time on friction coefficient
After the composite film leaves the curing chamber, its friction coefficient will decrease and finally reach a balance value.
4 Effects of air contact
In actual testing, we generally take several layers of samples on the outside of the roll film, and park it for a certain period of time to measure the friction coefficient of the composite film . Practice has proved that rewinding (after cooling) is beneficial to reduce the friction coefficient of the composite film, and the loose film winding tends to have a smaller friction coefficient.
5 Effects of corona treatment
Practice has proved that the corona treatment will increase the friction coefficient of the composite film .
6 Effects of adhesives
Practice has proved that the use of polyether adhesive will increase the friction coefficient of the composite film .
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