What's the solution to the brittleness of PET sheet produced

What's the solution to the brittleness of PET sheet produced? Enjiadi, the manufacturer of PET sheet production line, introduces to you: the solution to pet brittleness is that the sheet produced will be brittle, and the production line itself has no crystallization, just sucking hollow. Pet is a crystalline plastic raw material, this situation is produced during Blister molding, which requires instant cooling before pet itself has crystallization problem, and the sheet turns white after molding.