The reason we are asking these is that we had complaints about FG-4 because zipper is tighter than usual.
We had the same complaints about 3 different lot no. from 3 different end users each.
These lot no. were produced from March 31st to April 2nd; we are guessing they were produced in one consecutive production, correct?
It is partly because end users opened zipper bags forcefully.
Still, it is true that zipper is tighter than usual and you need to use a certain amount of force to open these bags.
Therefore, we would like to know whether or not you check if zipper is too tight.
Kindly advise.