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  1. Thread: Color Shift

    by rickbatey
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    2
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    111

    Re: Color Shift

    Colorant probably has the wrong carrier resin in it. Most likely, they're using HDPE and its not liking the base resin. Either that or they used a pigment package in the color that isn't high heat...
  2. Re: “Splay” issue on PA66 GF30% with UV stabiliser.

    So your 'splay', should be the UV stabilizer being damaged or consumed in the barrel due to the high barrel temps, mold temps, and residence time. I've seen this many times when running UV or FR...
  3. Re: Creaking Sound and tool to platen wear, Engel Tie Bar Less.

    One question: Does this press have the 'scroll block' deflection system or the newer one looking two or more blocks?
    I have never seen this on the scroll block style but with the newer ones I have...
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    972

    Re: preform tail breakout

    Maybe you have molded in stress causing the issue? A polarized light source and filter inspection could point out high molded in stress levels. I have also used chemicals like mold cleaner to...
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    1,259

    Re: Insert molding metal terminals

    I believe you will need to tweak the terminal design to ensure the melt flow and cavity pressure doesn't damage them. But, if not properly supported in the mold; they can move and may get twisted or...
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    1,312

    Re: M.F.R. Question

    I remember a resin supplier at one time would pull samples and watch the MFR of the resin. Typically you get low at the start- of a production run and high at the end. So they would go back and post...
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    Re: Back Pressure

    Do you have a shut off nozzle? Without it, and without the proper software in some machines, you cannot continue to recover the screw while the mold opens and the parts are ejected; for the absolute...
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    16,197

    Re: Back Pressure

    Do you have a shut off nozzle? Without it, and without the proper software in some machines, you cannot continue to recover the screw while the mold opens and the parts are ejected; for the absolute...
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    4,452

    Re: Shop recommendations

    You also need to discuss the tolerances because that will dictate final costs. Also, can you use UHMWPE instead to save money on the parts? Even machining for those small quantities will be hard for...
  10. Re: Round pieces injection resulting squared problem

    Where is the gate? Gate size? Gate style? Mold and melt temps? What's the part length? Normally these are extruded due to these reasons.
    Rick
  11. Re: Intermittent screeching noise during plasticising stage

    Does the press have a high torque screw plasticizing settings? If so I would turn it on. I would see if you can see the actual screw drive pressure/energy while plasticizing. I would bet that the...
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    1,255

    Re: Kraus Maffai - adding USB.

    You can get a floppy emulator from various sources that accept USB sticks on the other end.
    Rick
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    Re: Merry and Happy

    Thanks and prayers for much improved year, 2021!!
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    2,210

    Re: Merry and Happy

    Been sick since so count your blessings of family as well. Not Covid though daughter has double pneumonia, wife bronchitis, me something in between but they have ear infections as well!! So I’m...
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    Re: Large Injection Mold Pallets

    We have two mold movers that we use to get the tools under the correct crane. One is a large heavy duty pallet Jack on steroids and the other a truck like thing you drive from on top. We store...
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    18,517

    Re: Krauss Maffei

    You have to change the setting on the hold pressure stages from one mode to the other but with a KM I’m afraid you’ll be disappointed. Also, I think that’s how they tunes the electric servo pumps....
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    3,091

    Re: Problem during TPE processing

    I would lower the barrel settings slightly as I believe the barrel capacity is low enough to cause cooking out of some of the additives in the resin. Also what size are the resin purchases? I ask...
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    Re: Unsolved ınjection problems

    I suspect your barrel settings are too high for UV package in resin. Hence to odd locations. Need to reduce the barrel sertings, screw rpm and back pressure.
    Rick
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    24,982

    Re: Unsolved ınjection problems

    Water temperature ? Barrel temperatures ? Mold temperatures ? Screw recovery time and back pressure? Valve gate settings? Hot runner brand and style? Mold venting? Drier settings? Barrel residence...
  20. Re: New Machine Brand Decision? Help me choose!

    If you’re looking at Mucell, Engel was one of the first to assist with that technology from the start. Also, with that process you can run larger shot weights with lower clamp forces. I don’t like...
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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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    1,260

    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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    2,469

    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...
  25. 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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