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A novel approach of measuring the dielectric properties of PET preforms for stretch blow moulding

机译:一种用于拉伸吹塑的测量PET瓶坯介电性能的新颖方法

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摘要

Polyethylene terephthalate (PET) is the most common plastic material used in injection stretch blow molding (ISBM) process for the manufacturing of bottles. The injection-molded PET preform has to be preheated uniformly to a pliable state before the blowing stage of the process. Microwave technology offers a potentially more economical means for preheating the preform in place of the conventional infrared oven heating. For such applications, determination of dielectric properties of PET preform of a given geometry is essential. This article describes a novel approach of measuring the dielectric properties of PET preforms at microwave frequencies instead of the common experimental procedures used for such measurements. The dielectric properties are determined by using both CST Microwave Studio electromagnetic simulation software and the automatic network analyzer together. No complex mathematical solutions are required. Validation of this new approach has been made by comparing the measured dielectric properties of some polymers with those available in the published literature. (C) 2008 Wiley Periodicals, Inc.
机译:聚对苯二甲酸乙二酯(PET)是用于瓶子制造的注拉吹塑(ISBM)工艺中最常用的塑料材料。在该过程的吹塑阶段之前,必须将注塑的PET预成型坯均匀地预热至柔韧性状态。微波技术提供了一种可能更经济的方式来预热预成型坯,以代替传统的红外烤箱加热。对于此类应用,确定给定几何形状的PET预成型坯的介电性能至关重要。本文介绍了一种在微波频率下测量PET预成型件介电性能的新颖方法,而不是用于此类测量的常规实验程序。通过同时使用CST Microwave Studio电磁仿真软件和自动网络分析仪来确定介电性能。不需要复杂的数学解。通过将某些聚合物的测量介电性能与已出版文献中提供的介电性能进行比较,可以验证这种新方法的有效性。 (C)2008 Wiley期刊公司

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