Surface Homogeneity of Injection Molded Parts

  • László Zsíros Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, H-1111 Budapest, Muegyetem rkp. 3., Hungary
  • József Gábor Kovács Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, H-1111 Budapest, Muegyetem rkp. 3., Hungary

Abstract

In this paper we are presenting a novel method for color inhomogeneity evaluation. We proved that this method has a higher than 95 % linear correlation coefficient if results are correlated with human visual evaluations.
We applied this evaluation method to analyze the homogenization in the injection molding process, therefore we measured the homogenization properties of various solid phase masterbatches on injection molded parts. We tested the effects of the processing parameters of injection molding and analyzed various dynamic and static mixers as well. We have also measured the influence of the mold surface texture on the sensation of inhomogeneities on the part surface.
We have carried out our tests on an injection grade ABS material using various masterbatches. The method was based on the digitization of the molded flat specimens. The images of these specimens were evaluated with an own developed formula using the CIELAB color space resulting high correlation with human visual inspections.

Keywords: mold design, color inhomogeneity, injection molding
Published online
2018-07-09
How to Cite
Zsíros, L. and Kovács, J. G. (2018) “Surface Homogeneity of Injection Molded Parts”, Periodica Polytechnica Mechanical Engineering, 62(4), pp. 284-291. doi: https://doi.org/10.3311/PPme.12128.
Section
Articles