I have a problem regarding my product Polyethylene Film. There is white powder in surface film, but not clearly seen, if I use black napkin to swab the film, the napkin turns to vivid white. My product is endless film without printing and using Blowing production method. I am afraid this will affect to food safety because most of my customer is food industry.
If you have any idea what root cause which made that white powder, please give me advice, what could I do, maybe what test I should do to identify this powder.