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  • Gas Assisted Injection Molding

    Discussion in 'Manufacturing processes' started by odinmould, Feb 2, 2015.

    1. odinmould

      odinmould Member

      Aug 2014
      Likes Received:
      What is gas assisted injection molding?
      It is conventional injection molding with the addition of a compressed gas (nitrogen) that is injected into the part, forming a hollow core.
      Gas assisted injection molding advantages:
      Improve polymer flow
      Improve product stiffness
      Improve surface aesthetics, eliminate sink mark
      Reduce internal stress, warpage
      Reduce part weight
      Reduce number of parts
      Can have variable nominal wall thickness
      Reduce clamp tonnage

    3. Hantte

      Hantte Member

      Jun 2012
      Likes Received:
      It's very good way to make thick parts, like handles etc, where you can't design thin material or use other tricks to make item look thick.
      Problem is, that hollow core is very difficult to control. For example I had a fridge with almost 2 meter high door and handle was an ejector. Because children were not careful enough, we had five handles during the eight years of fridges life time. They all were gas filled injection mould parts and there were three different kind of design.

      Lesson learned: if you design a Gas filled plastic parts, you really have to know what you are doing.

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