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Study on Relevant Factors Influencing the Strength of Weld Line Defect in Micro Injection Molding Process

The presented dissertation represents influencing mechanism of various related factors on micro injection molded weld line’s mechanical properties. According to the special features of micro injection molding process compared with normal injection molding process, the main related factors to weld line’s properties were classified as 3 group, named as processing conditions, mold design and structure, external process.

Regarding factors in the processing conditions group, the effect of micro injection molding processing parameters and nano fillers on micro weld line strength was investigated. Additionally, how nano fillers (Carbon Nanofibers and TiO2 nanoparticles) affect properties of the weld line defect in micro injection molding was investigated as well.

As for factors related to mold design and structure, the further understanding of polymer melts flowing behavior in micro scale cavity related to micro channel cross section shapes and injection gate dimensions has been achieved, which finally affects the mechanical properties of micro injection molded weld lines.

Considering external process related factors, effects of the ultrasonic oscillation and the physical vapor deposit (PVD) metallic thin film on micro injection molded weld line properties were discussed. Finally, a novel effective visualizing experimental method for observing polymer melts filling behavior in micro cavity is purposed and realized, which offers an approach to directly investigate weld lines forming and developing process during micro injection molding process.

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Author
 Lei Xie

Lei Xie
Institut für Polymerwerkstoffe und Kunststofftechnik
Technische Universität Clausthal

Information

Free keywords: Micro injection molding, Weld line, Ultrasonic oscillation, Physical vapor deposit, Visualizing mold
Institute / chair: Fakultät für Natur- und Materialwissenschaften der Technischen Universität Clausthal
Language: English
Technical consultant for expert services: Prof. Dr.-Ing. Gerhard Ziegmann (Betreuer), Prof. Dr.-Ing. Michael Gehde
Publication year: 2010
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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