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  1. Thread: Pressure Gap

    by Suhas
    Replies
    8
    Views
    826

    Re: Pressure Gap

    Sorry, if I misunderstood.
    What are p4072 and p4055? What are the output names?
    Thanks
    Suhas
  2. Thread: Pressure Gap

    by Suhas
    Replies
    8
    Views
    826

    Re: Pressure Gap

    Hello,

    All 'modern' machines, say in the last 20 years made by reputed makes such as Arburg are closed loop machines. So you may set the value to 2000 bar but the machine will only take what it...
  3. Thread: Nozzle Leakage

    by Suhas
    Replies
    3
    Views
    1,431

    Re: Nozzle Leakage

    Hi Joe,
    What did you find out here? Just curious.
    Suhas
  4. Replies
    2
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    568

    Re: Injection Molding - Grivory Resin

    Hello,

    That is interesting. You have done good analysis here. It just looks like a case of incompatible additives. I am not sure what advice I can give you but it is best that you show your...
  5. Re: Creaking Sound and tool to platen wear, Engel Tie Bar Less.

    Hi,
    That is an interesting observation. I have not seen that but I have always heard the large machines creak and make noise during injection.
    Sorry, not of much help.
    -Suhas
  6. Replies
    4
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    2,163

    Re: Tube with zero draft

    Hello Ken,
    Zero draft is tough (almost impossible) for such long tube lengths! I am assuming the tolerances are tight also. If you find the right grade with a release agent it may be possible at...
  7. Replies
    3
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    2,184

    Re: Arburg pressure issue

    Agree with ijchan above. Can you put an analog gage and check?
  8. Replies
    4
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    2,371

    Re: Insert molding metal terminals

    Wow! I learnt something from Rick. Those are some good suggestions. Did not know about POM - Copper. Thanks.

    Just to answer one question about POM - POM bonding,: Yes, they will bond well. It is...
  9. Re: ID shrinkage observed on Brass Metal Insert (C3604) after plastic injection over Moulding

    All we are trying to do is to reduce speed and pressure to check if it is influencing the diameter reduction. So so reducing speed and pressure may help.
    Just thought of this: This can also be a...
  10. Replies
    1
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    1,933

    Re: Gloss level improvement for HDPE

    Hello,

    I hope someone can answer your question here. We are all into Injection Molding primarily.
    But with my experience in Injection Molding, I am not sure if you can get good gloss via blow...
  11. Re: ID shrinkage observed on Brass Metal Insert (C3604) after plastic injection over Moulding

    Hello,

    It could be that your metal insert is not thick enough and cannot withstand the plastic pressure causing it to collapse. Try to see of you can decrease the speeds and pressures and the...
  12. Thread: M.F.R. Question

    by Suhas
    Replies
    5
    Views
    2,323

    Re: M.F.R. Question

    Good Q!

    > MFR testing is very subjective. Each person is going to get a different result since there are a lot of variables. Even the way you pack the pellets will make a difference.

    > Agree...
  13. Replies
    1
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    1,629

    Re: Injection Unit Throat Temperature

    Hi Josue,

    For PP, set it to around 150 to 200 deg F. Actually for most plastics, that is a good range.

    -Suhas
  14. Replies
    3
    Views
    4,743

    Re: Masterbatch material dispersion

    Hello,
    This could be a processing issue, you need better mixing. Try:
    1. Increase the melt temperatures
    2. Increase screw rotation speeds
    3. Increase back pressures
    Let us know if any of this...
  15. Replies
    2
    Views
    5,838

    Re: Ultra-sonic cleaning of mold components

    Hi Joe,
    I do not know the names of any companies but there are several of my clients who use these with good success.
    Regards,
    Suhas
  16. Replies
    1
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    2,643

    Re: crack in production

    Hello Hassan,
    Where is the gate?
    Is the crack in the same place all the time?
    Suhas
  17. Replies
    3
    Views
    1,404

    Re: Adhesion on overmolded PCB with PA 678

    Hello,
    This is does to post mold shrinkage. Can you try to overmold the parts one or two days after you mold the substrate (1st part)?
    Let us know.
    Suhas
  18. Thread: Sanity Check

    by Suhas
    Replies
    5
    Views
    1,816

    Re: Sanity Check

    Hi,
    Those pressures provided are hydraulic pressures. What does that translate to in plastic pressure?
    For PBT, mainly work with pack and hold pressures. Are you sue the gate is sealed? Do a gate...
  19. Replies
    5
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    1,665

    Re: Van Dorn 230 HT Ejector Speed

    Does the mold have springs?
    Do you have the ejector tied in? Or are they just push?
    -Suhas
  20. Replies
    4
    Views
    1,894

    Re: Screw Recovery Issues

    Hello,

    1. Do you see that issue only with Nylon?
    2. What is the back pressure?
    3. On the JSW there is (or at least there was) a high torque and low torque setting. Have you tried using both...
  21. Re: Intermittent screeching noise during plasticising stage

    DM1977,
    All very valid points above.
    Also try raising the zone temp next to the feed throat - in fact in the feed zone of the screw and see if that gets better.
    Let us know.
    Suhas
  22. Replies
    7
    Views
    2,177

    Re: KM Not achieving clamp pressure.

    Yes, you will need to calibrate it. However, if you have not have much experience with it, it is well worth to get the KM Tech to do it.
    Suhas
  23. Replies
    3
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    13,404

    Re: Remove screw from Kraus Maffei 200-1000 C1

    Hi,
    When I worked in maintenance (a long time ago) I found out that since the screw turns always in one direction, that is how it would also turn to tighten something. If not, it would come lose...
  24. Thread: Back Pressure

    by Suhas
    Replies
    8
    Views
    22,765

    Re: Back Pressure

    You should always add Back Pressure. There is a way to set back pressure but for now since you are a beginner, set it to about 7000 Plastic Psi or about 700 hydraulic psi.
    If you do not add back...
  25. Re: Picked up an older Krauss machine, any advice would be greatly appreciated.

    All the best and thanks for thinking of sharing the manuals.
    Suhas
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