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Improved spinnerette design for extrusion of polymeric large internal diameter hollow fiber membranes

机译:改进的喷丝头设计,用于挤出聚合物大内径中空纤维膜

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摘要

Spinnerettes for extrusion of large (similar to 1 mm) internal diameter (i.d.) hollow fiber membranes must possess certain features to extrude fibers with the proper tensile and geometrical properties. Spinnerette designs that properly extrude small i.d. (< 200 mum) hollow fibers will produce large i.d. hollow fibers with low burst strengths because of poor flow patterns and insufficient time in the spinnerette to knit a strong seam interface. In this report, an alternative design is offered that provides much better fiber properties without creating high pressure drops or shear stresses at the spinnerette wall that would normally result in melt fracture. The equations that guide the presented spinnerette design are provided and the suggested design is successfully guided by the results. The new spinnerette design also has the feature of allowing rapid change of hollow fiber wall thickness by making the core fluid pin replaceable. (C) 2002 John Wiley Sons, Inc. [References: 14]
机译:用于挤出大内径(i.d.)内径大的中空纤维膜的喷丝板必须具有某些特征,以挤出具有适当拉伸和几何特性的纤维。喷丝板设计可正确挤出小内径(<200毫米)中空纤维会产生较大的内径中空纤维,由于流动方式较差,喷丝板中没有足够的时间来编织牢固的接缝界面,因此具有较低的破裂强度。在此报告中,提供了一种替代设计,该设计可提供更好的纤维性能,而不会在喷丝板壁上产生通常会导致熔体破裂的高压降或剪切应力。提供了指导所提出的喷丝头设计的方程式,结果成功地指导了所建议的设计。新的喷丝头设计还具有通过更换芯流体销而允许快速改变中空纤维壁厚的功能。 (C)2002 John Wiley Sons,Inc. [参考:14]

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