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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111790


    Title: The Different Viscosity Arrangement Effects on the Variation of Interface between Skin and Core in Co-injection Molding
    Authors: Huang*, Chao-Tsai (CT);Chen, Cheng-Huang;Chen, Kuan-Hao;Lin, Gwo-Geng;Hsu, Chih-Chung;Chang, Rong-Yeu;Tseng, Shi-Chang
    Keywords: Co-injection molding , Core penetration, Skin-to-core ratio, Flow imbalance
    Date: 2017/05/09
    Issue Date: 2017-10-20 02:10:23 (UTC+8)
    Abstract: Co-injection molding, one of the multi-component molding methods, is commonly used in our daily life product. However, there are too many combinations of designs and parameters, how to properly control of co-injection is very challenge. Furthermore, co-injection with multi-cavity system is still not fully understood yet. In this study, we have focused on a nonsymmetrical multi-cavity system. First, we tried to find out how the different viscosity arrangement effects on the variation of the interface between skin and core layers in co-injection molding. Specifically, we have assigned three types of material arrangements, say A/A (low viscosity-to-low viscosity), A/B (low viscosity-to-high viscosity), and B/A (high viscosity-to-low viscosity). In A/A system, with a unique skin-to-core ratio and a fixed flow rate, general operation parameters have no significant effect on the change of the interface between skin and core. In A/B system, it generates longer and narrower locus than that of A/A system. It might be due to the higher viscous core material has higher inertia force to push in flow direction. On the other hand, in B/A system, it generates shorter and wider locus than that of A/A system. It might be due to less viscos core material has lower inertia force to push melt in perpendicular to flow direction. Moreover, in the presence of flow rate variation, as flow rate increased, the penetration distance of interface between the skin and core is reduced for A/A system. This reduction phenomenon on the penetration distance of the interface is also observed in A/B and B/A systems. Finally, the experimental study is also performed to verify the numerical predictions on the different viscosity arrangement effects. Specifically, in the presence of flow rate variation, the numerical prediction on the interface between the skin and core is in a good agreement with the experimental data in trend.
    Relation: SPE Technical Papers , Paper No. 151, pp 1-5.
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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