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Analysis of defects caused by halo defects during injection molding  

Lee, Soon-Young (Department of Product Design and Manufacturing Engineering, Graduate School, SeoulTech)
Park, Eun-Min (Department of Product Design and Manufacturing Engineering, Graduate School, SeoulTech)
Kim, Do-Hun (Department of Mechanical System Design Engineering, SeoulTech)
Kim, Yong-Chul (Department of Mechanical System Design Engineering, SeoulTech)
Yang, Chul-Seung (Department of Mechanical System Design Engineering, SeoulTech)
Jin, Gyeong-Min (Department of Mechanical System Design Engineering, SeoulTech)
Kim, Sun-Kyoung (Department of Mechanical System Design Engineering, SeoulTech)
Publication Information
Design & Manufacturing / v.13, no.4, 2019 , pp. 57-62 More about this Journal
Abstract
In this study, we investigated the halo surface defection of various phenomenon occurred during the injection molding process which is caused by the thinning of the product thickness and the importance of the appearance. Surface analysis was performed to observe the difference between the surface where defects appeared and the surface which did not appear. Based on these results, we analyzed the phenomenon of halo surface defects was caused by unstable flow of resin generated in injection molding and velocity change of flow front. Furthermore, we will conduct a clear analysis of halo surface defects through observations through optical microscopy and subsequent observations with atomic force microscope. It has been analyzed that halo in PP is due to the rheological difference between the crystalline and amorphous regions while that in PC/ABS is due to shear separation of PC and ABS.
Keywords
Halo surface defect; Injection mold; Shear rate;
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