Print film purchase experience introduction
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There are many varieties of films on the market today, but the most commonly used printing films are BOPP, NY, PET, and PE. As far as printing is concerned, the most important thing is of course the surface treatment effect of the film, and whether the NY film is damp. The process requirements for the film surface tension of the film should be established during printing. The corona effect is time-sensitive, and if it is left for a long time, the corona effect may fall too much to meet the printing requirements; it is also possible to avoid the trouble of accidentally inverting the film surface printing.
PE film is the focus of our attention: there may be a film roll leaking corona treatment when blowing film; the film thickness is too large or uneven to cause corona effect is not enough; blown film is to add too much slip agent or high cool Excessive proportion of slip particles causes a significant decrease in corona effect. When the corona effect of the two sides of the 12~15um PET film is not much different, it is easy to cause the back of the printed film roll to be stuck. Corona requirements for the membrane: BOPP, PE ≥ 38 dynes, PET ≥ 50 dynes, NY ≥ 52 dynes. The NY film does not have a large effect on the corona effect after water absorption. It is judged whether the NY film absorbs water and sees whether the film shrinks or not. When a film is cut into the oven for several hours, the hand feels hard, if there is a trend If the phenomenon is hard, the NY film absorbs too much water. In the purchase of film must be explained to the supplier of the use and requirements of the film, and now the film variety is refined, light said PET, NY, BOPP name, suppliers may have several varieties, but not necessarily all.