A PET sheet extrusion line is a long-term production asset. This guide explains how to compare a PET sheet production line for APET, RPET, PETG and CPET food packaging, from venting and drying to finished output and roll quality.
PET sheet is one of the most competitive packaging materials in the world, but two lines quoted at a similar price can behave very differently in daily production.
Start with the forming process
A line for high-speed thermoforming needs different melt quality, cooling and gauge stability from a line making thick printed sheet. Define the finished part before selecting a screw diameter.
Drying, venting, or both?
APET, PETG, CPET and RPET absorb moisture. A vented twin-screw extruder can reduce or eliminate the crystallization and drying step for many products, saving energy and floor space.
Thickness and width determine the downstream
For 0.15-1.5 mm packaging sheet, a three-roll calender with fast cooling and precise edge control is usually the core of the line. For thicker sheet, cooling time and internal stress become more important.
What to ask before you approve the quotation
- What resin and regrind ratio was the line sized for?
- What is the guaranteed thickness tolerance at line speed?
- Is the output based on finished product or extruder capacity?
- Which parts are included for automatic gauge control?
- What is the commissioning and training scope?
A good PET sheet line is not the one with the largest motor. It is the one with predictable melt, cooling and tension at the speed you actually run.
Related BENK extrusion lines
Need help with your sheet or board line?
Send the material, sheet or board size, thickness, target output and application. BENK will recommend the extruder, die, cooling and downstream configuration.