There are many types of films on the market, but the most commonly used printing films are BOPP, NY, PET, and PE. In terms of printing, the most important thing is of course the effect of the surface treatment of the film, and whether the NY film is damp. When printing, the process requirements for measuring the surface tension of the film should be established. The corona effect has timeliness. If it is left for a long time, the corona effect may fall too far to meet the requirements of printing. It is also possible to avoid the hidden troubles caused by inadvertently reversing the film surface.
PE film is the focus of our attention: when the film is blown, there may be a film roll that is missing the corona treatment; the film thickness is too large or uneven to cause the corona effect to be insufficient; the blown film is added with too much of a smoothing agent or high Excessive proportion of sliding granules causes a significant reduction in corona effects. When the corona effects on both sides of the 12~15um PET film are not much different, it will easily cause the back-adhesion failure of the printed film roll. The corona requirements of the printing film: BOPP, PE ≥ 38 dynes, PET ≥ 50 dynes, NY ≥ 52 dynes. After the NY film absorbs water, it will not have a big influence on the corona effect. It is judged whether the NY film absorbs water and sees whether the film shrinks or not. Cut a film and put it into the oven for a few hours. Whether it feels hard or not, if there is a tendency Hard hair, etc., the NY film absorbs too much water. In the procurement of film must explain to the supplier the use and requirements of the film, thin film species refinement, light said PET, NY, BOPP name, suppliers may have several varieties, but not necessarily all suitable.
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