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传统的PE和PS的物理起泡法是在两个前后排列安装的单螺杆挤出机上完成的。但Berstorff公司称ZE/KE Schaumtandex组合具有较高的挤出效率，其第一段混炼和塑化挤出机由双螺杆挤出装置替代。 Berstorff称，这种组合的使用可同时为双螺杆挤出机带来良好混炼能力和单螺杆挤出机极佳
The traditional physical foaming of PE and PS is done on two single-screw extruders arranged in tandem. However, Berstorff claims that the ZE / KE Schaumtandex combination has high extrusion efficiency and the first mixing and plasticizing extruder was replaced with a twin-screw extruder. Berstorff said the use of this combination results in both good kneading and twin-screw extruders for twin-screw extruders