re:Please my company how to make food bags is qualified?

Please my company how to make food bags is qualified?
First of all, look at the appearance, woven bags have good wear resistance, so a good bag is not scratched, there is no damage, look at the surface printing, it should not fade, the printing is clear. Sealing is also intact, there is no damage.
Second, check whether the bag leaks. Manufacturers usually check the leak is the use of coloring method, that is, the coloring agent in the bag, the closure seal. Then place it horizontally on the filter paper, place it for a few minutes to see if there is discoloration on the filter paper. If there is no discoloration, turn it on the filter paper horizontally and place for a few more minutes to see if the filter paper is discolored. Still no discoloration, indicating that it is in good condition, otherwise, the quality is unqualified.