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Effects of Dynamic Mixers on the Color Homogeneity and the Process in Injection Molding
Author(s) -
Török Dániel,
Kovács József Gábor
Publication year - 2019
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25026
Subject(s) - homogeneity (statistics) , materials science , composite material , process (computing) , engineering drawing , mechanical engineering , process engineering , computer science , engineering , machine learning , operating system
The quality of any injection molded part is related to the defects visible on the surface. Injection molded parts are usually colored with a masterbatch due to its cost‐effectiveness. The most common surface defect is unevenness of color. This can result from an inadequate coloring process. The problem is the uneven dispersion of the coloring additives in the polymer. In this article, we examined the mixing efficiency of nonreturn screw tips of various flow cross sections. We developed an image analysis algorithm to rate color homogeneity. With the help of the measurement method, we examined screw tips of various geometries. We analyzed the effect of the characteristic geometries of screw tips using simple geometry screw tips. We compared commercially available dynamic mixer screw tips with nonreturn valves of simple design. Based on our results, we designed our own dynamic mixer, which provided good homogeneity with less shear load on the material. POLYM. ENG. SCI., 59:E189–E195, 2019. © 2018 Society of Plastics Engineers