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Expert of R&P POLYPLASTIC shared knowledge on how to avoid defects during injection moulding

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Tiger stripes, burn on defects, sink marks, visible weld lines, skellering and foreign icnlusions – this is by far not a full list of defects faced by producers of thermoplastic products. Head of Technical Support Department of R&P POLYPLASTIC Stanislav Zubkov took part in the 2nd Ukrainian Polymer Forum and shared his knowledge about the causes of abovementioned defects and ways of minimizing them during the process of injection moulding.     

The expert made a report in an online format within the “Defects, their causes and troubleshooting” session and described five primary factors affecting the quality of moulded parts.

“A number of factors influence the manufacturing process of high-quality moulding parts. When optimizing parameters of injection moulding a complex approach is required, said Stanislav Zubkov, R&P POLYPLASTIC. – Quality, to a considerable extent, is ensured at the stage material development, product engineering and technological process planning”.

The expert stated some figures: during the process of injection moulding up to 70% of defects are caused by false plasticization and injection. Incorrectly engineered pouring gate system is accountable for 68% of defects resulting from forming equipment. Up to 80% of defects identified during the process of manufacture and exploitation of products are conditional to low quality of concept development and constructional design.

Factors influencing injection shrinkage were supplemented by case studies. Stanislav Zubkov drew special attention to making the choice of shrinkage value for designing injection equipment based on previous experience, structural features of the product, gating system and preanalysis in computer modeling systems, for instance, MoldFlow.

The report of R&P POLYPLASTIC expert aroused big interest among the Forum’s audience: participants asked further questions and noted extensive practical experience of the specialist.

We would like to remind you that the Technical Support Department of R&P POLYPLASTIC provides professional technological assistance to customers at all stages of material utilization.