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Thread: Purging of clear PC for weekends or at shut down

  1. #1
    Join Date
    Aug 2011
    Posts
    624

    Purging of clear PC for weekends or at shut down

    What is your purging process at the end of a run or weekend shut down for clear PC to avoid black specs?

  2. #2
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    701
    Leave the barrel full of PC, drop the heats to about 350°F across the barrel and leave the press that way until start up. Just remember to start the press as soon as the cold screw prevention goes off.

  3. #3
    Join Date
    Aug 2011
    Location
    Santa Rosa, CA
    Posts
    95
    Rick beat me to it. I worked at a plant that molded miniture optics for fiberoptic couplers and connectors. This is how we did it. Keep the "bank temp" just above the Tg of the material so that the material will not shrink away from the barrel wall.

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