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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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    Re: Velocity Study

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

    407
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    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...
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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...
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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...
  8. Thread: Flow Lines?

    by The Rookie
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    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...
  9. Thread: Flow Lines?

    by The Rookie
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    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...
  10. 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
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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...
  15. 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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    Shot Size Procedure

    Hi all!

    I was wondering if I could get some feedback on a procedure that I was given. This is to be carried out on a new mold after the barrel and mold temperatures are at operating conditions. ...
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    Re: Cushion Changes with Pack Time

    Yes JayDub, the established process did produce good parts. I am in the same boat as you to check the machine. When running, I thought it sounded different than the other identical presses.
    ...
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    Re: Cushion Changes with Pack Time

    Thanks Joel! I already made my bags this morning to start the process - once I get an okay from management.
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    Re: Cushion Changes with Pack Time

    Taken literally, yes he is correct that a gate freeze study isn’t needed. But I thought that even for hot runners we should perform the study. We won’t look for the weight to level off, but the %...
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    Re: Cushion Changes with Pack Time

    Thanks for all the comments! Sorry I have been away at a machine FAT all week.

    The product we make is a relatively thin test tube if that helps anyone get more ideas about the gate freeze. At...
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    Cushion Changes with Pack Time

    Hello all!

    As I mentioned in my first post, I am very green to injection molding, so bare with me :)

    This week I was working on a press to see if we could reduce cosmetic defects. The...
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    Re: Pin Hole in Gate

    Joel and Chris,

    Thanks for sharing! The mold is currently out for PMs, so I will give an update when we get it back in.

    Rook
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    Pin Hole in Gate

    Hello all!

    Just wondering if anyone has any advice or guidance on dealing with a pin hole in the gate.

    Cavitation: 96
    Material: PET
    Hot Runner: Valve Gate

    I was inspecting tubes for...
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