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  1. #1
    Join Date
    Mar 2019

    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 different.

    I'm hoping to get an understanding of what the graphics should look like and why.

    Blue Line - Injection Velocity
    It is pretty straight forward until we switch to pack and hold
    There is a slight dip followed by a relatively constant velocity before dipping again at the end
    What actions are creating that profile? I was thinking screw rotation, recovery and decompression...but I don't know which part is which

    Green Line - Screw Position
    The screw position graphic is showing position during injection, pack and hold, decompression, recovery

    Orange Line - Injection Pressure
    This graphic shows the injection pressure during the cycle.
    I can understand why it is increasing during the injection phase, but I don't know why it is dipping before leveling off in the pack/hold
    There is also some dipping at the end that I'm not sure what it is from?

    Attached Thumbnails Attached Thumbnails Inj_Velocity_001.jpg   Inj_Pressure_001.jpg  

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