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Thread: Parts sticking to pins

  1. #1
    Join Date
    Jan 2020
    Posts
    14

    Parts sticking to pins

    Hey guys so I canít say an awful lot about it but on a poly job running chiller on the mold I have parts sticking to the pins. The pin witness marks are not prominent and no flash around where the pins are. Iím down half a sec on cycle time to get the press running consistently but I am curious as to what could be causing it. The parts are sticking to just the pins not the cavity and like I said that t shows me no signs as to why itís doing it no prominent witness marks no stress marks from ejection parts are correct sizes and cooling time is within process parameter. I also have the press running consistently by giving more time for parts to fall after second stroke(parts move in and out with the pins until back on second stroke) but I need that half second back and canít figure out where to take it from the cycle

  2. #2
    Join Date
    Nov 2012
    Posts
    116

    Re: Parts sticking to pins

    rule no.1
    Do not touch running proces

  3. #3
    Join Date
    Mar 2020
    Posts
    1

    Re: Parts sticking to pins

    Is this a new problem or has it been an issue from day one?

  4. #4
    Join Date
    Sep 2012
    Location
    Lakewood, WI
    Posts
    90

    Re: Parts sticking to pins

    Ejector pins standing proud causing plastic to be molded around them? I've seen this many times, esp. with light parts and/or sleeve ejection.

  5. #5
    Join Date
    Jan 2020
    Posts
    14

    Re: Parts sticking to pins

    Sorry to take so long to get back I ran at the slower cycle till engineering got in told them the mold was over packed and after they lowered the shot size down all issues disappeared I knew it was an overpack problem but not being allowed to change things on the injection screen makes fixing it a pain in the rear

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