There are many types of films on the market today, 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 be reduced too much to meet the printing requirements. 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. NY film does not have a great effect on the corona effect after absorbing water. It is judged whether the NY film absorbs water to see if the film is shrinking. If a film is cut 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 of the film and requirements, and now thin film species refinement, light said PET, NY, BOPP name, suppliers may have several varieties, but not necessarily all suitable.