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Pre-dry ALL material for 3 to 4 hours at 82°C (180°F).
To reduce viscosity in the extrusion process, it is more effective to increase RPM than to increase temperature.
Extruder/Screw Recommendations:
- Minimum L/D of 24:1.
- Screw compression ratio of 2.5 to 3.1.
- Use Barrier or Maddock mixer screw.
- Contact the AnswerPerson(SM) for foamed extrusion applications.
Size extruder for midrange RPM (30 to 80 RPM).
Die Design Recommendations:
- Keep land length to a minimum (never exceed 16 mm [0.625 in]).
- Streamline flow channels in the head and die.
- Oversize die opening by 7 to 10% for length and width.
- Oversize die opening by 3 to 5% for thickness.
Do not exceed 15% drawdown.
Run with lowest melt temperature possible (do NOT exceed 215°C [420°F]).
Use consistent regrind ratio (recommend 20% regrind to 80% virgin).
Use PP or PE-based carrier for color concentrates.
Do NOT use PVC or acetal in the extruder before or after running our materials. Purge with PP or PE.
The AnswerPersonSM
Technical solutions, right away. Exclusively from ExxonMobil Chemical's Santoprene brand TPVs.
The AnswerPersonSM