Results 1 to 14 of 14

Thread: 'Over Drying' of PC ?

  1. #1
    Join Date
    Aug 2011
    Posts
    589

    'Over Drying' of PC ?

    Have you experienced any issues when you have ‘over dried’ PC?

  2. #2
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    669
    Not PC. Now I have had the issue with PA, loss of plasticizers and the parts were brittle and failed the bust test. But not PC. Now I have seen WD-40 wiped on PC parts and they develop stress cracks afterward?!

  3. #3
    Join Date
    Aug 2011
    Posts
    541
    Color shift on a bluish tint that turned grey after too long in the dryer. It was a part that was to be sterilized.
    Funny,we were just talking about this.
    Keep on Molding!

    brent

  4. #4
    Join Date
    Sep 2011
    Posts
    1
    Quote Originally Posted by Suhas View Post
    Have you experienced any issues when you have ‘over dried’ PC?
    We keep our dryers running at 250 degs for PC and I have never seen a problem related with over drying. What would I expect to see? Burning? Brittleness?

  5. #5
    Join Date
    Aug 2011
    Posts
    589
    @Clessard, Thanks for your post. Honestly, I am not sure. I did some research on overdrying of PBT and Nylons and got some interesting results. It is usually the additives that degrade and leave the system and then that particular property related to the additive is lost. For example, in PBT it was an impact modifier (almost certain) that was lost and so the parts ended up being brittle. So with PC, I am not sure. Brent (above) had some insight.
    Hope this helps.
    Suhas

  6. #6

    Re: 'Over Drying' of PC ?

    No u will notice when it stops pulling and have 2 cut the hopper in half not usually an issue

  7. #7

    Re: 'Over Drying' of PC ?

    Only when u have 2 cut you're hopper apart and throw it away

  8. #8
    Join Date
    Mar 2014
    Location
    Minnesotan living in Wisconsin
    Posts
    28

    Re: 'Over Drying' of PC ?

    Old post resurrected, but funny story....

    Saw this once, long ago. 300 lb hopper filled with ABS.

    Unfortunately the temperature controller was in C so when someone mistakenly set it at 150 (thinking it was F) it created a giant unbreakable Rice Krispy block inside the hopper.

  9. #9
    Join Date
    Nov 2012
    Posts
    122

    Re: 'Over Drying' of PC ?

    °C is a normal unit :-) or not?

  10. #10
    Join Date
    Jun 2014
    Location
    EU
    Posts
    105

    Re: 'Over Drying' of PC ?

    but the number is not normal

  11. #11
    Join Date
    Mar 2014
    Location
    Minnesotan living in Wisconsin
    Posts
    28

    Re: 'Over Drying' of PC ?

    Quote Originally Posted by Pilot View Post
    °C is a normal unit :-) or not?
    I would love to go to all metric in the US! Just need to convince several hundred million other people first.

  12. #12
    Join Date
    Jun 2014
    Location
    EU
    Posts
    105

    Re: 'Over Drying' of PC ?

    Quote Originally Posted by Ten Fingers View Post
    I would love to go to all metric in the US! Just need to convince several hundred million other people first.
    Oh man you don´t want to....otherwise you would have to pay the price for gallon also for liter

  13. #13
    Join Date
    Mar 2014
    Location
    Minnesotan living in Wisconsin
    Posts
    28

    Re: 'Over Drying' of PC ?

    Quote Originally Posted by Jendalf View Post
    Oh man you don´t want to....otherwise you would have to pay the price for gallon also for liter
    I am old enough to remember when gasoline went above $1 USD per gallon. The majority of the gas pumps at the time only had two digits available for price so, for a time, gasoline pumps were switched over to litres at a per litre price!

    All pumps were quickly upgraded or new pumps purchased with a return to gallon pricing. Crisis averted!

  14. #14
    Join Date
    Nov 2012
    Posts
    122

    Re: 'Over Drying' of PC ?

    funny discussion :-) gasoline price here (CZ) 5,03 USD per gallon today :-)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •