Grooved-bore, single-screw extruders are commonly used in Europe, and they are used to a lesser extent in North America. In North America, they are often used as the extruders for blown film, blow molding, and pipe processes where the discharge temperatures need to be relatively low and the rates high. Screw designers for grooved-bore machines are very good at providing screws that discharge at low temperatures and high rates, but they typically are not focused on providing a gel-free extrudate. This paper will discuss methods to mitigate gels for grooved-bore machines running polyethylene (PE) resins.
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