The effect of processing factors on weld lines in injection moulded nylon 6 nanocomposites

J. Tung, G. P. Simon, G. H. Edward

Research output: Contribution to conferencePaper


The effect of process factors on weld lines of nylon 6 nanocomposites was investigated. Eight process factors were evaluated: injection pressure, holding pressure, holding time, back pressure, screw rotational speed, cooling time, melt and mould temperatures. A modified L16 orthogonal array of the Taguchi method with three levels was designed to run injection moulding experiments using a smaller number of samples to determine the most influential parameters. The experimental results were analysed by sensitivity test signal-to-noise (S/N) ratio and analysis of variance (ANOVA). The results show that the principal process factors for single end-gated tensile samples are different to those of double end-gated samples when the weld line occurs. The important process factors of the single end-gated samples are injection pressure and mould temperature, whilst for the double end-gated samples are mould temperature and melt temperature. The temperature factor plays an important role in processing to heal the weld strength by promoting the ability of polymer molecules to diffuse across the weld line boundary, enhancing interfacial strength at the weld region.

Original languageEnglish
Number of pages5
Publication statusPublished - 1 Jun 2004
EventANTEC 2004 - Annual Technical Conference Proceedings - Chicago, United States of America
Duration: 16 May 200420 May 2004


ConferenceANTEC 2004 - Annual Technical Conference Proceedings
Country/TerritoryUnited States of America


  • Nylon 6 nanocomposites
  • Signal to noise ratio
  • Weld lines

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