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    Re: Overmolding/Insert molding

    First off you should mold the abs and then over mold. Secondly you can purchase an add on injection unit from numerous companies now days. Most of them are available in all electric platforms for...
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    Re: Rare cosmetic defect

    To me it looks like either poor color dispersion or unmelted pellets. I would watch the screw recovery pressure at start and then check it every half hour. I think you’ll find it low at the start and...
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    Re: Embedded Bubbles

    In my experience with running clear resin , you never run the screw empty and you never shut the barrel heats off. You ramp them down low enough the resin won’t degrade and leave them on; say 350*F....
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    Re: Overmolding or insert molding?

    I ask; did you tell preheat metal inserts? Differential shrinkage can be the root cause. But I also ask did you clean/degrease inserts prior to molding? Cutting oils normally have sulphur in them...
  5. Re: Random variation on cushion and part sticking to core.

    So it appears this is a thin wall high speed press and process? I ask how long
    It takes screw to recover, do you have shut off nozzles in mold or on press, and can you monitor screw recovery...
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    Re: Help please, Milky Bloom/stain

    What is the width and depth of the tab gate? What is the part thickness at the gate? I think your gates should be much wider and the depth adjusted to create a better melt flow in the cavity. I also...
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    Re: Process Sheets (Control) Suggestions

    We use the same tolerances on all settings, like barrel or mold heats +/- 10* C, tonnage and all variables are given similar ranges. No issues for us as long as the variance sheet lists name, defect...
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    Re: Help please, Milky Bloom/stain

    It looks like you are shooting into sub-gated cold runner from valve gate. I think the gates are too small and shearing the melt to the point that the talc is blooming onto the surface. Sequencing...
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    Re: Embedded Bubbles

    I could see an additive or even the FR or UV package breaking down. One question: What do you use to purge and shut down with? Kinda looks like PE or PP contamination.
    Rick
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    Re: Old 250 Ton Milacron

    Sounds like the pre-fill valve doesn’t close until 2nd attempt. Be that a sticking valve or loss of clamp lock up signal I’m not sure. Could even be low pump output pressure or flow.
    I’d check and...
  11. Re: How to avoid transition marks due to change in flow rate while using Sequential gating?

    The color changes are more than likely due to the flow direction changes and enhanced by the pigment particle shape from the colorant. We’ve seen this many times and our process fill pattern could be...
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    Re: Flakes in Mold, gating?

    When I see this, I feel that the gates are dull. The dull edges of the gate create the flakes at the runner is separated from the part. Part of your issue may be that the gate edges were dulled due...
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    Re: Boy 50T2 no SEMI-AUTO or AUTO

    Do you have a shot size set on the machine? Is that stroke made? Injection timer set to something other than 0? Injection or hold pressures set? Pack/hold timers set ? Clamp force set? Carriage...
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    Re: 20% GF PP Warp

    What about melt temps? Entire mold hotter too? I only see on gate. Where are the others? I know this won’t run a decoupled process due to reminding me of plastic bowl lids; they look like potato...
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    Re: Krauss Maffei MC6 parameterlist

    It’s possible but I think, from the alarm , that you haven’t selected any parameters on the monitoring screen. Select them and create your list, then you should be able to print them. You can upload...
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    Re: Storage Box Lid Warpage

    I think you will need a short and quickly ramping downward hold pressure profile to stop this tendency. The root cause is as you said. I think a warmer mold on both halves to reduce molded in stress...
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    Re: Overmold Possibility

    First thing make sure you have enough part thickness to allow the inserts to become totally encapsulated within the part. You will need to support the inserts in a way that holds them in place as the...
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    Re: ENGEL CC200 Network Drive setup

    You will need to contact Engel for the software necessary for this.
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    Re: Run mold water at 248F !

    I wouldn’t use disconnects due to coming off, leaking seals and soon. I would JIC or Flare fittings. If you’re worried about change over times, plumb the molds with manifolds and use larger fittings...
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    Re: Help: Acrylic Black Specks and Pitting

    Has this ever ran good? The pitting sounds like gels or unmelted pellets. The nozzle tips looks incorrect for the sprue too. I would use the Eliminator from Sam Kern or properly sized full internal...
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    Re: Stearic Acid Residue from ABS Resin

    Where are the barrel heats and what is the shot utilization or resident time?
    Rick
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    Re: PMMA Molding< WARP>

    We really don’t have enough information to help you root cause the issue. You could be running mold cold or melt too hot/cold or even the pack/hold phase incorrectly.
    Rick
  23. Re: Autojector HS-30 not turning screw fast enough

    Has it ever ran correctly? Maybe your heats are too cold or not as high as they’re showing on screen.
    Rick.
  24. Re: Cleaning hot runner / manifolds while colour changing

    To clean the hot runner you have to raise temperatures and open all valve gates. Run back pressure at max with max to medium rpm. Donít recover and shoot through mold because that wonít clear the...
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    Re: molding with electrical pins

    So you didn’t mention it but I think you’d be better off preheating the inserts too. The inserts can freeze the melt before it can completely flow around the pin. Also ensure you have great venting...
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