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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Investigations of the plastics flow during the injection molding process - selected results

Nabialek J., Kwiatkowski D.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 17, nr 1-2

225--228

Purpose: The purpose of present paper was presenting chosen results of investigations on polymer flow during mould cavity filling phase of injection process. Deep understanding of the phenomena which occur during filling the injection mould may lead to more effective design of the processing tools and shortening of the time for implementation and production time. Design/methodology/approach: The results of computer simulations of injection process have been compared with the results of video recording for the plastic flow during filling phase. For the simulation investigations a professional computer software Moldflow Plastics Insight ver. 4.1. has been employed. A specialized injection mould which enables observation and registration of the plastic flow during processing has been employed. The mould enables direct monitoring of the course of phenomena inside the mould cavity in two planes. To record the flow, a digital video camera has been employed. As an example the issue of flowing around the rectangular obstacle of the plastic stream and flowing through the throat have been described. Findings: The results of the investigations enabled documenting of specific phenomena which occur during plastics or their composites injection process. The registered video sequences have been compared with the results of numerical calculations and then it was estimated to what degree the computer simulation of injection process may be useful in practice. Research limitations/implications: The camera enabled to register the flows with the rate of 25 fps. This reduced the scope of the investigations, since at higher plastic flow speeds the registered image became less clear. The investigations were performed on a wide scale, however, only chosen results have been presented. Originality/value: The transparent sight-glasses have been used, made of a material called Zerodur® which is characterized by the coefficient of thermal expansion close to zero.