The issue is whitish mark in the hinge part of the flip top cap.
My hunch is that a stress whitening occurred right after ejection of the caps in the mold. I suspect that they have in mold closing mechanism in their injection machine which will flex the hinge (before ejection) to provide...
Hi, I'm Noel, handling injection molding stuffs. I would to ask regarding living hinge problem in PP flip top caps. We observed a whitish mark in the living hinge of the flip top cap. This happened right after ejection in the mold
Is this normal or if not, what would be the probable causes and...
