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Leistritz testing dryer-less PET sheet extrusion

March 17/2010

March 17 (plasticstoday) -- Extrusion machinery supplier Leistritz has set up two of its MAXX twin-screw extrusion systems, and related auxiliary equipment, in its Somerville, NJ lab to process undried PET and directly extrude it in sheet form. Leistritz says only that the result is a quality product with "dramatically less energy consumption."


In most production environments, PET resin typically is dried separately before being processed on a single-screw extruder. The ZSE-27 and ZSE-50 extruders that are being fed undried PET pellets or regrind have multi-stage vacuum venting to minimize or avoid hydrolysis. The extruders have a gear pump, screen changer, and flexible-lip sheet die attached, which feeds the 3-roll stack that cools and forms the PET sheet.


Leistritz says the ZSE-MAXX series, with increased torque capabilities and a 1:66 OD/ID ratio, is especially well suited to PET processes that are torque-, heat-, and shear-sensitive. The series also has an improved barrel cooling design that benefits PET processing.

Leistritz testing dryer-less PET sheet extrusion











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