Printing process of heat shrinkable film label
Printing process of heat shrinkable film label
Prepress: as a heat shrinkable film label. In the printing process. The shrinkage deformation is inevitable. Sometimes even more serious, but the different direction and position of the shrinkage may not be the same. Therefore, how to design the graphic and bar code before the printing of the design of the shrinkage deformation error, is the difference between making shrink labels different from other printed matter. Here is a brief analysis of how to deal with.
(1) prepress heat shrinkable film.
In theory, in order to obtain good printability on the plastic film, the surface tension of the film should be higher than the surface tension of the ink.
In the plastic film, such as PP, PE film is non-polar polymer material, chemical stability, surface tension is small, lower than the tension of the ink. Although some film surface tension and the tension of the ink was even higher, but its surface is smooth, nonporous surface adsorption capacity is small, and add a variety of synthetic resin film in the opening agent, antistatic agent, anti-aging agent can also affect the surface properties of the films, the printing adaptability variation. At present, there are some printability problems in the majority of shrink films. Therefore, in order to improve the printability of the surface of the film, it is necessary to improve the surface tension and the surface adsorption capacity. The commonly used methods are corona treatment plasma treatment chemical treatment coating treatment and so on.
(2) the size of the label image. First, according to the thickness of the shrink film. The film of the transverse and longitudinal shrinkage rate and the packing in each direction allows shrinkage, allows the generation of graphic shrinkage deformation deformation after errors, to determine the size of text on the label to ensure the shrinkage, shrinkage and deformation after the text can accurately restore.