What calibration methods are recommended when extruding Eastman Provista™ copolymer into a pipe or tube?
As with most other materials, sizing plates and sizing sleeves are most commonly used to size Eastman Provista™ copolymer into pipes or tubes. Things to be aware of when doing this are: • The recommended finish for all surfaces coming in contact with molten plastic should be a dull smooth finish. This is best done by sandblasting, vapor-honing, glass-beading, or simply using a high-grit sandpaper or even steel wool so that the least amount of surface contact is made with metal to prevent sticking. • Nicklon coating all surfaces that come in contact with molten plastic, along with proper treatment of the surface prior to applying this coating, is an excellent way to prevent sticking, which causes chatter, a very common problem encountered when extruding copolyesters into pipes and tubing. Nicklon is a nickel/Teflon material used when reduced friction is required. The contact for having a Nicklon coat applied is: Micro Surface Corp. 465 E. Biscoe Drive Morris, IL 60450 Tel: 815-942-4221
