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Journal of Plastics Technology 2019/02

Investigation of the process and geometry dependent tensile and shear strength of weld lines in polystyrene

Investigation of the process and geometry dependent tensile and shear strength of weld lines in polystyrene

In order to understand the formation of weld lines and the resulting reduction of the part’s tensile strength, influencing factors such as process parameters and part geometry on the morphology and tensile as well as shear strength of weld lines in polystyrene were quantified. In the investigations an influence of melt temperature, holding pressure height as well as flow obstacle geometry and distance to the flow barrier on the tensile strength of weld lines could be determined. Contrary to the literature, a high strength was found directly behind the flow obstacle. Furthermore, the formation of a weak boundary layer could be observed. An influence of the varied parameters on the shear strength was not found.

Jakob Onken, Prof. Dr.-Ing. Christian Hopmann
Institut für Kunststoffverarbeitung (IKV) an der RWTH Aachen

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The Journal

The Journal of Plastics Technology is a peer reviewed internet periodical published under the auspices of the Scientific Alliance of Polymer Technology (WAK)


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International Polymer Processing

International Polymer Processing, the journal of the Polymer Processing Society, is a discussion forum for the world-wide community of engineers and scientists in the field of polymer processing.

The journal covers research and industrial application in the very specific areas of designing polymer products, processes, processing machinery and equipment.


International Polymer Processing


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The Journal of Plastics Technology is indexed in SCOPUS, the largest abstract and citation database of peer-reviewed literature.