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    Re: IQ, OQ, PQ Sample Documents

    I'd really appreciate this too. I'm working on developing some in house. Once complete I'll post mine too.
  2. Thread: Nozzle Leakage

    by nikom
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    Re: Nozzle Leakage

    What material?
    What nozzle size and what is the sprue opening?
    Assuming you checked the nozzle for damage and alignment?

    If the carriage isn't moving back at all and the nozzle seat and nozzle...
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    Re: Shop recommendations

    50 pieces is a really small quantity. Do you have a mold already? Can you have them machined instead?
  4. Re: Molding nylon with photoluminescent pigment and UV stabilizer

    I don't know the exact chemistry but typically photoluminescence is driven by the absorption of higher energy UV photons. The UV stabilizer might be inhibiting this.
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    Re: Hot Runner/Tolerance Issues

    I run a few 48 cavity acetal molds. Your temps are kind of high but that might be necessary due to deficiencies of the hot runner. Can you split the hot runner plates to remove the solidified tip on...
  6. Thread: Back Pressure

    by nikom
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    Re: Back Pressure

    What benefit are you hoping to get by changing the process?
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    Re: Molding around a bearing

    We have a four cavity bearing/POM overmold project. Like ijchan223 said, you need to seal off on the outer race, not the seal. Our overmold comes down a few thousandths around the race to keep the...
  8. Thread: Sanity Check

    by nikom
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    Re: Sanity Check

    I hate how often that happens. Glad you got it resolved and thanks for the follow-up.
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    Re: Enhancing flow properties of resin

    Is a pressure loss study even necessary on newer machines (last 20 years) that can graph the injection pressure vs screw position?
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    Re: FR Rated Materials

    Low shear, low residence time, good venting.

    For mold design you may need a corrosion resistant coating or steel.
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    Re: How accurate are Mold Flows?

    I haven't had any training but have been using moldflow for awhile and have been trying to find time to compare results to the real world.

    The most important aspect of getting reliable results is...
  12. Re: Selection of Right Parameter for Injection Molding cycle optimisation

    Filled it out, although I've never heard the term 'wet cycle'.
  13. Re: from which plastic are drills made ?? like dwealt or makita

    The housings? A lot of times they are made from glass and mineral filled nylons, or PC/ABS.
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    Re: New Battenfeld electrics?

    We just got a brand new hydraulic from them. It has performed well and the ability to control the mold heaters from the main screen is nice. The interface can be slow to change screens, and we had a...
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    Re: Overmolding/Insert molding

    I've only ever done it the other way. Is there no way to overmold the buttons into the housing? I would be worried about the ABS deforming the softer TPE.
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    Re: Air recycling Hopper Dryer

    We have older dual bed dryers with molecular sieve desiccant. If you reach out to your supplier they should be able to answer all your questions and make sure you're getting setup with everything you...
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    Re: Air recycling Hopper Dryer

    This is how most dryers I've used work. The return air is passed over a dessicant bed to remove the absorbed moisture.
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    Re: Proposal of Acetal in a Hot Manifold

    We run a couple molds like this, 48 cavity in Celcon M90. Cosmetics at the gate are poor, we also had issue with cold slugs from the gate causing parts to split at the knit line during assembly.
    ...
  19. Thread: Paulson Simtech

    by nikom
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    Paulson Simtech

    Anyone else doing the Paulson Simtech challenges? Might be interesting to discuss, any opinions if it promotes good or bad habits? How do you think it translates to the real world?

    You can sign up...
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    Re: Liquid color issue

    We got a PPE mixing nozzle with four elements and that helped substantially. The parts are small with constant wall thickness, hollow cylinders about 1.5" long.
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    Re: Cosmetic Process Window

    The images you posted are fairly small and make it difficult to read the graphs, you may want to reupload them to somewhere like Imgur and link them here.

    Is there any sort of velocity limit on...
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    Re: Liquid color issue

    A small update, we ran another tool that is a cold runner with the same shot size but different parts. No color issues were observed with this mold, but some processing changes were made that will...
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    Re: Cosmetic Process Window

    I'm not sure how to solve it, but it looks like a delay in the response of the machine. Is this an electric or hydraulic machine?
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    Re: Liquid color issue

    Another update, smaller barrier screw is installed. Mixing in the liquid color is very homogeneous but the knit line issue remains. Waiting to hear back from Mold Masters and hopefully get a...
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    Re: Liquid color issue

    Thanks for the input, I'll be doing a DoE soon. We have a smaller screw for the machine that is a barrier screw designed for acetal, but the supplier was not able to install it while they were here...
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