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  1. Re: Mucel causing zones in barrel to rise in temp far above set point.

    Is this press a new one with the proper systems for MuCell or an afterthought retrofit? Without the exception I gut screw, counter pressure on the screw and proper non return valve; you will live...
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    Re: Thank You All - from Suhas

    Suhas thanks for providing this forum to us all!
    Rick.
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    Re: High Hot runner temps.

    With that much glass filler a standard hot runner will wear out very quickly due to abrasiveness of the fibers. I’d make sure the screw reaches shot size and then stops decompression about 2-3...
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    Re: Material Stock Temperature

    You can make a piece to go into the hopper out of sheet metal and cut the hopper volume down to reduce time in the hopper. I’ve done this many times over the years.
    Now you may be seeing this due...
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    Re: Blush or Graying at molded part edges

    Looks like a wall thickness change reading through. I think you’ll have to adjust wall thickness change on underside to fix the issue.
    BTW how much draft is on the part? Little draft could create a...
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    Re: Ultem and CF Peek in an aluminum mold

    How about making gate a fan style so you can get enough area to stay open during the entire pack/hold phase? Have you ran a gate freeze to see how long it stays open? Are you gated into the thickest...
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    Re: Soft Cap , need advice

    Could be LLPE. I’ve ran that in Mouse spouts before.
    Rick
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    Re: Ultem and CF Peek in an aluminum mold

    How are you heating the tool? Can you get it hotter? Perhaps the runner is freezing too soon hence the sinks or voids. Can you injection compression the parts? Maybe that would work.
    Rick
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    Re: Recovery Issues at Start-Up

    Have you confirmed all is correct inside injection unit? Maybe wear or pellets stuck to the screw after shutting down. How do you shut these machines down and for how long? Run them completely empty...
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    Re: Ultem and CF Peek in an aluminum mold

    Nikom,
    We have looked at it for SEVERAL molds. But to convince a company to try something new is ALWAYS a stretch. There’s a place in NC reasonably close to us that we want to use. Our thoughts were...
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    Re: Ultem and CF Peek in an aluminum mold

    I’ve found it easiest to place heaters in the mold base and use a mold heat controller to get the mold hot enough. Place rod heaters with thermocouples in the mold to get it hit enough. Also add an...
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    Re: Soft Cap , need advice

    The straw caps I’ve ran in with past were molded of PE and gated into the large end. Mold had stripper plate for ejection and ran pretty fast cycle times. You had to watch process as you could mold...
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    Re: Kawaguchi K 480 B settings

    Have you checked the screw and barrel for wear? Had a JSW in a shop that ran slow cycles due to worn out screw.
    Rick.
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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...
  15. 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...
  17. 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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