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http://dx.doi.org/10.7736/KSPE.2013.30.3.317

A Study on Mixing Characteristics of Two-component Polyurethane for In-mold Coating  

Lee, Ho Sang (Department of Aeronautical & Mechanical Design Engineering, Korea National Univ. of Transportation)
Kim, Dong Mi (Department of Aeronautical & Mechanical Design Engineering, Korea National Univ. of Transportation)
Publication Information
Journal of the Korean Society for Precision Engineering / v.30, no.3, 2013 , pp. 317-323 More about this Journal
Abstract
In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.
Keywords
In-Mold Coating; Mixing Head; Polyurethane; Aftermixer; Runner; Two-Component; Volume Fraction;
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