Dyna-Purge Purging Compound – SF

Select by process requirements

A purging compound for cleaning polymer processing equipment.

SF is intended for single- and twin-extrusion equipment, especially systems that must retain screen packs, use mixing or metering sections, or operate with tight die clearances. Listed applications include pipe, sheet, profile, cast film and blown film.

Key benefits

• Select the grade according to polymer and operating temperature
• Evaluate under actual machine conditions
• GKFRP can support purge-process review

Application data

The supplied sheet gives a reference purge quantity of approximately 4.5 kg per 2.5 cm of screw diameter, with actual usage also depending on the screw L/D ratio and equipment condition.

Suggested barrel and screw cleaning sequence

1. Maintain the current resin processing speed and temperature.
2. Completely clean the feed hopper.
3. Empty the current resin from the machine.
4. Add Dyna-Purge SF in small increments through the hopper or feed throat.
5. Allow the purge to pass through the system and exit the die.
6. Continue adding SF until contamination is removed.
7. Adjust temperature for the next resin.
8. Feed the new resin to displace Dyna-Purge SF from the system.
9. Resume production with the new resin.