From your information feedback on the patterns and symptoms of defect occurrence, we are certain that this slight uneven surface with a consistent pattern of occurrence actually come from our carrier tape forming process. The phenomenon is inherent in our carrier tape forming process. It is what we call a "Press Mark". As this is part of the process of carrier tape forming, therefore, it cannot be done away with.
After our initial discussion with our team, we would like to request your production side to increase the temperature of the heating block as you have mentioned.
If this temperature increase can resolve your sealing problem, we hope you can standardized it.
However, if it does not resolve the problem, please do get back to us again.
We would like to extend our assistance in resolving your sealing problem.