 
Bill Kent of Brown Machine recently wrote an article, "Third-Motion Servo Plug Assist," for SPE Thermoforming Quarterly. This article discusses the benefits of actuating plug assists independent of the upper or lower platens within the form station. Bill also describes the two basic third-motion designs used in large platen thermoforming machines for the North American market.
To read Bill's full article as it appeared in SPE Thermoforming Quarterly (First Quarter 2008, Volume 27, #1), click here.
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