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Thread: Screw speed units

  1. 9th November 2015, 02:32 PM #1
    mauriciob
    mauriciob is offline Junior Member
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    Question Screw speed units

    When specifying the recovery/dosing rotational screw speeds some injection molding machines as well as processing datasheets use the circumferential speed (mm/s, m/min, in/s..) whereas others use rotational speed (rpm). While circumferential speed makes more sense, rpm seems to be a popular specification unit for this parameter. Why is that? What screw diameter should I assume from the material process datasheets to make the correction when setting up my specific machine?

    What is the most popular unit being used in mother machines?
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  2. 11th November 2015, 05:59 AM #2
    Ten Fingers
    Ten Fingers is offline Junior Member
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    Re: Screw speed units

    When I look at resin process information I assume a 25 mm screw and a 13:1 intensification ratio.
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