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Thread: Screw Recovery Issues

  1. #1
    Join Date
    May 2021
    Posts
    1

    Screw Recovery Issues

    I am having issues with screw recovery on our JSW machines and nylon. The screw seems to struggle to get back every shot and going up on the rear zones of the barrel help but do not resolve the issue. Any tips or ideas would be appreciated.

  2. #2
    Join Date
    Aug 2011
    Posts
    623

    Re: Screw Recovery Issues

    Hello,

    1. Do you see that issue only with Nylon?
    2. What is the back pressure?
    3. On the JSW there is (or at least there was) a high torque and low torque setting. Have you tried using both and seeing if that makes a difference?

    Let us know.
    Suhas

  3. #3
    Join Date
    Sep 2014
    Location
    albuquerque
    Posts
    66

    Re: Screw Recovery Issues

    Greetings;

    I would add: is your Nylon dry? When you purge, is the material coming out of the nozzle popping and hissing?

  4. #4
    Join Date
    Jun 2021
    Posts
    3

    Re: Screw Recovery Issues

    What are your temperatures set at?

  5. #5
    Join Date
    Aug 2014
    Location
    Saint Paul, MN
    Posts
    181

    Re: Screw Recovery Issues

    Two possible scenarios:
    • Screw not plasticating
    • Screw plasticating normally, material drooling just as fast

    In the first case, consider:
    • Material not feeding (bridging in the throat due to poor temperature control)
    • Excessive wear in the screw and/or barrel

    In the second case, consider:
    • Back pressure too high
    • Nozzle temperature too high
    • Unsuitable nozzle tip design

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