화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.32, No.3, 183-194, August, 2020
DOI10.1007/s13367-020-0018-1  Export Citation
Generation mechanism of gloss defect for high-glossy injection-molded surface
Jinsu Gim, and Byungohk Rhee1, †
  • Center for Coating Materials and Processing, Engineering Research Center, Seoul National University, Seoul 08826, Republic of Korea
  • 1Department of Mechanical Engineering, Ajou University, Suwon 16499, Republic of Korea
E-mail:
The gloss defect on a glossy surface is one of the surface defects to be found on injection-molded products. In this paper, the effects of the filling and packing stages on surface gloss are investigated. Based on observations, a generation mechanism of gloss difference is proposed. The difference of the surface gloss can be explained by the replication of the shrinking polymer surface represented by a replication factor. The replication factor is the ratio of melt pressure to surface stiffness, which is influenced by the filling condition and the material properties. The melt pressure as a driving factor to the replication reflects the effect of the flow front speed and viscosity. The surface stiffness as a resisting factor reflects the effect of the flow front speed, mold temperature in the filling stage, and storage modulus. The replication factor shows a high correlation to the surface gloss over a wide range of filling conditions. The proposed mechanism recommends a uniform and high flow front speed and mold temperature to suppress gloss defects.
Keywords:gloss defect;shrinkage;melt pressure;surface stiffness;injection molding
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