What are the main cases for the occurrence of poor film flatness, poor brightness, and unstable sealing during the blowing process? How to solve them?

Case Analysis:

 Poor flatness is by reducing the filling of black masterbatch.

 Poor brightness is by re-choosing a carrier or increase the carrier content.

 Unfirm Sealing is by reducing the PE wax content, adusting the sealing machine air pressure and temperature.