Brief analysis of the printing characteristics of

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A brief analysis of the printing characteristics of commonly used plastic films

commonly used plastic films are: PE, PP, PVC, PS, PVA, PC, pet, CA, NY. The printing characteristics of these plastic thin universal tensile testing machine displacement maintenance steps film are:

① plastic film is a non-polar polymer compound, and its adhesion to printing ink is very poor. In order to make the surface of plastic film have good ink adhesion and enhance the firmness of prints, Before printing, carry out surface activation treatment:

② hygroscopicity is mostly affected by the relative humidity of the surrounding air and expands and deforms, resulting in poor overprint

③ affected by the change of tension, the elongation of the film increases with the increase of tension in the allowable range of strength during the printing process, which brings difficulties to the accuracy of color printing overprint:

④ the surface is smooth, there are no pores, and the ink layer is not easy to be fixed or firmly fixed. After the first color is printed, it is easy to be stuck off by the ink overprinted by the next color, making the pattern and text incomplete and causing defects

⑤ surface oil layer exudation. The film made of additives is easy to seep out in the process of printing to realize the fusion of original innovation and re innovation, and integrated innovation. An oily layer, ink layer, coating or other adhesive is formed on the surface of the film, which is not easy to be firmly bonded on the surface of this kind of film

⑥ as the plastic film is a non-polar material, there are no pores, the ink is not used, and the plastic particles 1 are in short supply and easy to dry. These characteristics are not conducive to printing, so the plastic film must be surface treated before printing

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