PET film extrusion lines with single-screw extruder and pre-drying
PET film extrusion lines equipped with single-screw extruders require the raw material to be pre-dried in order to prevent hydrolytic PET degradation. The material is then plasticised in the extruder and subsequently delivered to the smoothing unit by means of a melt pump, filtering system and slot die. Smoothing units with a horizontal roll arrangement have proved particularly suitable for extremely thin film with thicknesses below 200 µm.
1.Agglomeration/crystallisation
2.Pre-drying
3.Single-screw extruder
4.Screen changer
5.Melt pump
6.Slot die
7.3-roll smoothing unit with horizontal roll arrangement
8.Cooling rolls
9.Thickness gauge
10.Hold-back stand
11.Film accumulator
12.Winder
