Ink, ink, printing plastic bags before why corona first?
Usually used for plastic film printing, the dyne value (i.e. corona effect value) is 38~42, if you need to finish for a period of time, it is a little high point, because the corona effect with the extension of the time will decay!
However, just from the film blowing machine out of the plastic film inside and outside the tension is relatively small (you can also understand that the surface is more smooth), so the ink can not hang, will fade! Through after corona treatment, the surface tension of the film becomes larger (can also be considered to be a film surface corona hair, of course, is microscopic, with the naked eye can not see the attachment) so that the ink can to hang on, also will not fade!
Corona treatment - in simple terms, is to change the surface tension of the plastic film by the impact of the electric ion, so the corona machine is also called the impact machine and spark machine.
