At K 2010 in Düsseldorf, Reifenhäuser presented a cast film line producing 3-layer unstretched cast PET film. Now about four lines are using this technology in operation worldwide. Reifenhäuser expects additional lines will be shipped soon.
The key component of this line is the "Reitruder" twin-screw extruder that allows the processing of PET without the need for pre-crystallization and pre-drying, similar to the production of sheets. The company believes this technology offers the customer several technical advantages in addition to a cost-effective PET film production.
Due to a specialty designed rotary arm winder, it's possible to wind both sensitive 12µm thin PET film, classical CPP film, and stiff PET film of 150µm thickness in a way that eliminates the need for slitting and rewinding for many applications....