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  1. Replies
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    Injection Profile Engel Emotion 310

    Hello,

    We are setting up to do some process development on a tool. We have not been to able to figure out why our injection pressure is peaking around the same position during injection...
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    3,567

    Viscosity Study

    Hello all. We acquired an old press and tool from our customer who has asked us to re-qualify the process. Currently working on the viscosity study and having a bit of trouble (maybe machine...
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    Re: Embedded Bubbles

    Sorry all, it has been a crazy month with furloughs at the plant and I am just now getting back into work!

    Suhas, we do not purge through the manifold before starting. After the press shuts down...
  4. Re: Which manufacture has the best after sales support in your experience?

    Factors to consider

    1. Location of closest service technician
    2. 24/7 service if available
    3. Location of spare parts
    4. Spare parts list at that location

    In my experience KM/Netstal have...
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    4,727

    Embedded Bubbles

    Hello,

    We are seeing what our team calls embedded bubbles and were wondering if anyone has any insight or experience.

    Cavities: 64
    Material: PET
    Delivery: Direct Valve Gates


    If you...
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    Re: Back Pressure Settings

    Thank you Suhas!
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    93,872

    Back Pressure Settings

    Hello all!

    We are molding HDPE lids with an electric press. The material recommended back pressure (and everywhere online) says 50-150 psi for back pressure. I was under the impression that this...
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    Re: Cosmetic Process Window

    Thanks for replies!

    I did some processing this afternoon and hope my findings can spark a good discussion!

    It might help to explain the graphic. The red line indicates the injection velocity...
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    Re: Cosmetic Process Window

    This is a hydraulic injection unit.
  10. Replies
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    8,649

    Cosmetic Process Window

    Hey all!

    I’m working on a new valve gated hot runner mold and have reached the Cosmetic Process Window study to determine appropriate pack pressures.

    Transfer pressure is around 17,500 psi

    I...
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    Re: Velocity Study

    Thanks for the input.

    I just looked at several process sheets for our current machines running and we have fill time as a critical to quality validated parameter.

    Plenty of times I have talked...
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    3,771

    Re: Velocity Study

    Here is an example of a rheology study and the parts made at each speed.

    407
  13. Replies
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    3,771

    Velocity Study

    Hi all,

    I just finished reading the Optimization of the Injection Phase - Rheology Study and found myself confused

    The procedure is to establish a 95-98% filled shot at close to the machines...
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    Waviness/Ripple on Part

    Back again to get some processing advice :)

    I have been working on processing a few new test tube molds and was wondering if anyone has any input on how to eliminate a visual defect I am seeing at...
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    Re: Melt Pressure before Transfer

    Thanks Jay! The images show the profile for the injection phase and then the pack that might be useful for you to view at a later time.

    High Injection Speeds - The faster the injection speed, the...
  16. Replies
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    Melt Pressure before Transfer

    Hi all!

    We had an applications engineer in last week for a new mold and machine we are working on. Upon viewing our current process, he recommended we adjust our injection velocity in order to...
  17. Replies
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    Proper Short Shot - What do you think

    Hey all!

    We have been divided!

    Today our team was having a discussion about the proper short shot of our 100mm test tube (and various other lengths). Team Wavy Tube vs Team Cosmetically...
  18. Thread: Flow Lines?

    by The Rookie
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    5,218

    Re: Flow Lines?

    Sorry for the delay! We are running a 96 Cavity Valve Gated Hot Runner and material is from one dryer and has a minimum of 4 hours of drying. We tested the material for moisture and we were...
  19. Thread: Flow Lines?

    by The Rookie
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    5,218

    Flow Lines?

    Hello all! It has been too long since I have been on to post any questions/responses.

    Today I was taking pictures of PET tubes with extra back lighting for our quality department and they...
  20. Re: Cincinnati/Milacron: Opinions on presses & service

    From my experiences over the last few months - not so great on the service end.

    Our team here won't even consider them for future machines for this reason alone, and I believe our other plants...
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    Powerline 440 Mold Gate Function

    Hi all!

    I have been troubleshooting a 96 cavity valve gate hot runner tube mold and have become a little confused on the functions of the mold gate (which I am assuming is the valve gate).

    In...
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    Re: Injection Graphic

    Thanks Chris!

    By ramping to zero, do you mean adding a second stage to my holding pressure such as:

    Stage 1
    Velocity: 1 in/s
    Pressure: 10,000 psi
    Time: 1 second

    Stage 2
  23. Replies
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    Injection Graphic

    Hello all!

    I pulled an injection graphic as well as the pack/hold in hopes of getting an explanation of what is happening. We have 4 identical machines and molds, but each graphic looks...
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    Multiple Defects

    Hi all! I hope all is well.

    I was doing a study today to see the effect of process parameters on a “bubble” defect in PET tubes. I say “bubble” because I’m not sure that I can call it trapped...
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    Re: Milacron Powerline 330 auto lube failure

    Let me know what solution works for you! I believe some operators here had the same issue. I will ask them next week if they ever resolved the issue.
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