高分子科学系列讲座240讲:Dr. Ben Whiteside,Control and measurement of structure formation in ultrasonic micro injection moulding

文章来源:    发布时间:2016-11-29
报告题目:Control and measurement of structure formation in ultrasonic micro injection moulding(NO.PSLAB240-PS2016-20)
报 告 人:Dr. Ben Whiteside
单  位:Faculty of Engineering and Informatics, University of Bradford, UK

  Ultrasonic Injection moulding has emerged as an alternative production route for miniature and microscale polymeric components, where it offers some significant benefits over conventional microinjection processes. The primary advantage is the fact that heating is only performed on the volume of feedstock required for the product, so degradation problems due to extended residence time in the screw can be avoided, and the total energy required for heating is significantly lower. In addition, the ultrasonic energy can be sustained during the filling stage in the process which appears to significantly reduce the pressure requirement for cavity filling whilst simultaneously providing the ability to add heat after cavity filling, allowing molecular chain relaxation and reduced residual stresses.

  Here we use a novel injection mould tool which allows the comparison of conventional and ultrasonic moulding techniques. The tool allows direct viewing of the mould cavity using high speed conventional and infrared imaging which allows direct measurement of the flow rate and thermal consistency of the polymer melt. A microscale tensile test cavity in the tool has adjustable thickness and has been used to investigate the morphology development in polyolefins and using Differntial Scanning Calorimetry and SAXS/WAXS. The resulting mechanical property behaviour has been investigated using small scale mechanical testing apparatus.

 Dr. Ben Whiteside

  Dr. Ben Whiteside currently leads the RKT Centre for Polymer Micro and Nano Technology based at the University of Bradford, UK which performs internationally recognised academic research in the field of microinjection moulding. In addition, the centre provides a key resource for Industry working to bring micro and nano scale components to market and current customers include Dyson, Sabic, Invibio and BNL Ltd. Dr Whiteside leads a team of academics, researchers and PhD students to explore key research areas, including:

  Surface structuring of polymeric devices using feature replication for physical functionalities.

  Understanding material‐specific behaviour, crystallisation properties and corresponding bulk properties.

  Product property control using advanced process control/material combinations.

  Optical characterisation methods for polymer processes including high speed optical and thermal imaging systems.

  The Centre currently collaborates on research activities with groups in countries all over the world including, China, India, Italy, Denmark, Germany, Austria, Spain and the USA.