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  1. Replies
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    Re: Delta E Color Tolerance

    Your customer has more than likely had a complaint about different production lots not matching one another. But there are several process variables that affect color. High temperature, residence...
  2. Re: Switching on machine pressure versus Stroke

    Worn barrels and inconsistent NRV functions tend to drive the decision to pressure transfer. Multiple cavities with cold slug or drool issues tend to end up at hydraulic pressure transfer. Years ago...
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    Re: Fines in Material, BlackSpecs

    Try a dust remover from Matsui designed for regrind. BTW what is your shut down and start up procedures? That might also be a root cause. There are resins for medical molding that are much cleaner...
  4. Re: High Oil temperatuer reading on Injection molding BOY

    If the pump was left running or the start up clock turned on the pump with the cooling water off, The it may be hot. Can you reach tank and put a hand on it to see if it’s really hot? It may be a bad...
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    Re: Injection Graphic

    The pressure drops are the press response and valve or pump switching from velocity control to pressure control. Most machines use a graph with voltage on one side and pump pressure on the other. The...
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    Re: Thin wall IML defects

    Great pics and I totally understand the issue. Iíve seen a similar problem when back molding textiles onto plastic substrates. You need to reduce the peak pressure or length of time the label sees...
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    Re: ejector keeps breaking

    Do you mean this coupling, the tool, pins or lifters,blades, or return pins?
    Rick
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    Re: Thin wall IML defects

    I’m not really getting a good feel for defect from the pictures you put up. Can you add some more and then perhaps the root cause will be clearer.
    Rick
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    Re: Hot runner cleanİng

    There are several great purging compounds available but my favorites are PDQ from Slide, Asaclean, and Dynapurge. Though on the last two you need to use the card correct grade for the resin.
    I...
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    Re: Platen chatter and drift

    Is it a toggle? I’ve seen the mechanical stop set and cause some issues. Also the valve spool zero voltage may need adjusting. I haven’t done that in many years but someone else can probably walk you...
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    Re: Knockout tie-in on JSW electric

    I saw a very nice plant made system that used a small piece threaded onto machine rod and a set screw and plate added to mold plate. The ejector rob piece had to slots in it and the rod in the press...
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    Re: New Technology For Injection Molding

    Engel and their #1 customer, LEGO, have used Engel’s MicroPlast and Microflow to make essentially zero defects. It takes some time to set it until but once it’s running you shouldn’t have to touch...
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    Re: Pin Hole in Gate

    Is it always the same cavity in the mold? You could have a core cooling issue at the tip. Is there water in the entire core, a bubbler or cooling pin?
    Rick
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    Re: metallic color

    The carrier resin of the colorant is NOT melting with the base polymer as evidenced by the pictures. You need to raise heats slightly and watch recovery pressure as I’m sure you are too cold on the...
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    Re: metallic color

    I see that the color is poorly distributed in the melt. Raise the melt temperature on the barrel. That is probably a last ge shot size on the press so the injection unit is pumping large amounts of...
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    Re: Gas bubbe on worm thread surface

    Where is defect relative to gate? How is the resin gated into the office part? I believe it is a product of the melt front flow in the cavity. I think your melt is jetting into the cavity and results...
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    Re: Support for Moving side of Mold

    Easy fix would be use a locating ring on the moving side. If the ring canít come out of the platten then it canít slide down. BTW do you only start clamping in molds under tonnage ? If not the...
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    Re: Molding w Flame Retardant

    Use caution with residence time and shear/barrel temps. FR’s are sensitive and will bloom to the surface or cause splay or early degradation of the melt. I’ve not found them to stop up vents when...
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    Re: Cavities blockage

    I’d bet it’s something in the colorant. Try running parts without color and see if it happens. Last thing you probably need a melt filter with the ability to filter particles smaller than the tips. ...
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    Re: Thermolator question

    Many companies make them though I think Frigel is still one of the biggest players. Piovan is another name that comes to mind. I think Engel has used either Single or GWK for their booths.
    Rick.
  21. Re: How can you inject two different colors in the same part?

    Really now days there are options that never existed before. You can purchase an all electric add on barrel from Plasdan, Mold Masters, and others. Then you have to integrate it into your current...
  22. Thread: Defects

    by rickbatey
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    892

    Re: Defects

    Adjust heat at tip of valve gate and see if slowing the injection rate helps.
    Rick
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    Re: Nissei Screen...7 segment

    Looks like the display is going bad. We had an issue with some old machines and our Electronic Tech just plugged a modern small computer monitor into the machines.
    Rick.
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    Re: Die height Motor

    Is the press level? I’ve seen them slip but that was due to a bad brake on them. In the design what sets clamping force and controls it? I ask because maybe the motor is trying to adjust the clamping...
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    Re: Aluminium Tool life

    So most German or European tools have steel plates mounted outside the parting line that limits the tonnage applied to the parting line. I don’t have a picture but I can try and get one.
    Rick
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