PF Grade | Pre-Maintenance Extrusion Purging Instructions


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Asaclean® PF Grade Extrusion Purging Instructions for Removal of High Heat Resins for Pre-Maintenance Cleaning (Above 370ºC (700ºF))

PF Grade requires 0.5 mm (0.020") clearance for hot extrusion dies; works best if screen packs are removed.

  1. Upon completion of the production run, extrude the high heat resin from the machine, emptying the barrel. Clean the hopper and feed throat.
  2. Feed about 1 barrel capacity of Asaclean® PF into the hopper.
  3. Several times during the purge, stop the screw and allow the Asaclean® PF Grade to sit for about 30 seconds. Resume the screw rotation up to moderate screw speed. If resin contamination is still visible in the purge pile, repeat steps 2-3 until clean.
  4. Set all temperatures to 280ºC - 300ºC (535ºF - 570ºF) and continue purging under slow screw speed until temps are below 370ºC (700ºF).

    Note: Asaclean® PF Grade should not be left idle in the barrel for any period of time above 370ºC (700ºF).

  5. When all temperatures are below 370ºC (700ºF), stop the screw. Leave the barrel completely full of Asaclean® PF to prevent oxygen from entering the barrel.
  6. Do not allow the temperatures in the extruder to drop below 280ºC (535ºF) with Asaclean® PF in the barrel as overloading of the screw may occur when screw rotation resumes.
  7. When temperatures all reach 280ºC - 300ºC (535ºF - 570ºF), begin feeding Asaclean® EX Grade at a slow screw speed into the extruder to remove deposits from the screw and barrel and to make it easier to pull the screw. Follow the standard “Asaclean® Purging Instructions for Pre-Maintenance Cleaning and Screw Pull.” An unfilled grade of Asaclean®, such as Asaclean® U Grade, can be used to clean the screw and barrel, instead of the EX Grade, but may not be as effective at removing stubborn deposits.

Technical questions?

To request detailed technical bulletins or technical support, contact us at Asahi Kasei Plastics North America Inc.

Phone: (800) 787-4348 / (973)257-1999
Fax: (973) 257-1011
Website: www.Asaclean.com
E-mail: sales@Asaclean.com

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