The ZSK twin screw extruder, the “forefather” of all twin screw extruders, celebrates its 60^th anniversary this year. Werner & Pfleiderer, known nowadays as Coperion GmbH, delivered the first co-rotating, closely intermeshing ZSK twin screw extruder in 1957 – exactly 60 years ago. Since then, the ZSK extruders have undergone a transformation that was inconceivable 60 years ago – from what would now be considered relatively simplistic co-kneaders with a throughput rate of 170 kg/h to sophisticated, high-performance processing machines for a variety of applications in the plastic, chemical, food and pharmaceutical industries. They are manufactured with screw diameter sizes ranging from 18 to 420 mm and achieve throughput rates from 200 g to 125 t/h for polyolefins.

Source: https://www.coperion.com/en/60-years-zsk/home/