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  1. Replies
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    Re: Unstable cushion

    We finally fixed the variation with a new screw and barrel.
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    Re: Unstable cushion

    I am not exactly sure how to monitor back flow.

    We just put on a new 4-piece check ring today. The cushion range is reduced, but not yet where it should be.
  3. Thread: Mold saver

    by Filiberto
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    Re: Mold saver

    I have never used wax paper, but we do use Mold Shield, from Slide. It is a dry rust preventive. We also use the brown can of rust preventive from PPE on our pvc molds since it has an acid...
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    Re: Unstable cushion

    Those things are looking good. No nozzle leakage or drool (hot runner with no nozzle retract). Backpressure and screw position should be consistent since they are servo controlled, but I will...
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    Unstable cushion

    We have been chasing cushion variation on a 612 nylon job so I am reaching out for ideas or things I may be overlooking.

    Its a 96 cavity, 12-drop, hot to cold runner mold running in a 165T...
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    Re: Parts warping

    We are still investigating this issue and the idea of varying the panel thickness to prevent warping is being explored.
    Kevin, I like the sound of Flow Grouping Methodology. I am definitely...
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    Re: Parts warping

    Target wt is about 7.6g and target cycle is 6s. Technically, the machine records a cushion, but the plunger does bottom out and bounce back a bit. It is the only way to get any flat parts. The...
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    Re: Parts warping

    I wish I could answer that about the part weight with cushion. I don't think that data was collected.
    Yes, there is an undercut as well as stripper plates to lift the parts off the cores where...
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    Re: Parts warping

    Good stuff guys, thanks. I see we have more things to investigate further like fill imbalance and wall uniformity.
    Tool is valve gated with .039 gates and there are no baffles in the cooling. Hold...
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    Re: Parts warping

    Thanks for the replies!

    Brent, we are in AZ. 104 tomorrow :(

    The part is a round container lid and, yes, it is a brand new tool.

    The cavities and cores fit together individually as...
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    Parts warping

    Hello all,

    We have a major problem with parts warping. I am looking for some ideas. Part is about .02" thick and 4.5" diameter, gated on core.

    24 cavity valve gated hot runner stack mold,...
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