There are many types of films on the market, but the most commonly used Printing films are BOPP, NY, PET, 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. When printing, the process requirements for measuring the surface tension of the film by one film roll and one measurement should be formulated. The corona effect is time-sensitive. If it is left for a long time, the corona effect may drop too much to meet the requirements of printing; it can also avoid the hidden trouble of accidentally reversing the printing on the film surface.
PE film is the main object we should pay attention to: there may be a corona treatment when the film roll is blown; the corona effect is not enough due to the excessive thickness or unevenness of the film; the film is added too much slip agent or refreshing Excessive proportion of slip material causes the corona effect to decrease greatly. 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 sticking failure of the printed film roll. Corona requirements for printed films: BOPP, PE ≥38 dynes, PET ≥50 dynes, NY ≥52 dynes. After the NY film absorbs water, it will not have a great impact on the corona effect. Determine whether the NY film absorbs water to see if the film shrinks. If you cut a film and put it in the oven for a few hours, if the feel is hard, if there is a trend , Hard, etc., the NY film absorbs too much water. When purchasing a film, you must explain to the supplier the purpose and requirements of the film. Now the film varieties are refined. If you say the names of PET, NY, BOPP, the supplier may have several varieties, but they are not necessarily suitable.
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