PF Grade | High Temp Shutdown & Sealing Purging Instructions


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Asaclean® PF Grade Purging Instructions for Shutdown/Sealing/Start-up of High Heat Resins
(Above 370ºC (700ºF))

Shutdown & Seal

  1. Upon completion of production, purge the machine with Asaclean® PF Grade
    following the standard purging procedures.
  2. Leave barrel full of Asaclean® PF Grade and begin dropping the temperatures to
    below 370ºC (700ºF) under slow screw speed.

    Note: Asaclean® PF Grade should not be left idle at temperatures above 370ºC
    (700ºF) for any period of time.
  3. Once below 370°C (700°F), turn off the heats.

Start-up

  1. Turn on and set the heaters at 370ºC (700ºF)
  2. Wait until the temperature of Asaclean® PF Grade is at 370ºC (700ºF). Allow adequate time for all of the Asaclean® to plasticize, including material far from the thermocouple at the barrel wall. Extruder amps may spike if material is not completely plasticized.
  3. For injection molding: Once at 370ºC (700ºF), add a fresh barrel capacity of Asaclean® PF Grade and extrude through the barrel using moderate backpressure (enough to keep the screw forward) for injection molding.
    For extrusion: Once at 370ºC (700ºF), add a fresh barrel capacity of PF and extrude the Asaclean® PF Grade from the machine, emptying the barrel, as far as possible.
  4. Feed the next resin into the hopper and leave barrel full of the next resin.
  5. Set the heaters for the resin to be processed.
  6. For injection molding: Once at the temperature to be processed, add a fresh barrel capacity of Asaclean® PF Grade and extrude through the barrel using moderate backpressure (enough to keep the screw forward) for injection molding. For extrusion: Once at the temperature to be processed, add a fresh barrel capacity of  Asaclean® PF Grade and extrude the Asaclean® PF Grade from the machine, emptying the barrel, as far as possible.

    Note: Asaclean® PF Grade should not be left idle at temperatures above 370ºC (700ºF)
    for any period of time.
  7. Purge all of the PF from the extruder. If contaminated, repeat purging procedure with PF.
  8. For injection molding: Use low back pressure and screw speed until the next resin starts coming out from the nozzle, then increase to moderate back pressure and moderate screw speed until all of the ASACLEAN PF Grade is displaced. For extrusion: Use low screw speed until the next resin starts coming out from the die, then increase to moderate level until all of the ASACLEAN PF Grade is displaced. Begin production using the normal processing conditions for the next resin.

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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