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A Novel Manufacturing Process to Fabricate Double-Layer Membranes

机译：制造双层膜的新型制造工艺

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A new method to fabricate double-layer membranes by using a specially design casting machine is described in this study. This machine is able to produce membranes with a double-layer structure via a single-casting technique with the use of a closed-loop feedback control system. The membrane casting operation is controlled by a programmable logic controller (PLC). Membranes produced from this simplified technique exhibit similar properties as the double-cast membranes, such as a macrovoid free structure and good porosity property. Results show that high casting speed is desired during the membrane fabrication process as the relaxed polymer molecular orientation and low polymer chain entanglement promote vertical swelling, and hence enhance the membrane porosity. Turbulent coagulant flow further improves the membrane porosity due to the high solvent-coagulant exchange rate during the phase inversion process. In summary, this machine simplifies the double-casting technique and produces membrane with similar advantages as the membrane fabricated via a double-casting technique.
机译：在这项研究中描述了一种使用专门设计的流延机制造双层膜的新方法。该机器能够使用闭环反馈控制系统通过单浇铸技术生产双层结构的膜。膜浇铸操作由可编程逻辑控制器（PLC）控制。通过这种简化的技术生产的膜表现出与双重浇铸膜相似的性能，例如无大孔结构和良好的孔隙率。结果表明，在膜制造过程中需要高浇铸速度，因为松弛的聚合物分子取向和低的聚合物链缠结会促进垂直溶胀，从而提高膜的孔隙率。在相转化过程中，由于高的溶剂-凝结剂交换速率，湍流的凝结剂流进一步改善了膜的孔隙率。总而言之，该机器简化了双浇铸技术，并生产了具有与通过双浇铸技术制造的膜相似的优点的膜。

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