Generation mechanism of gloss defect for high-glossy injection-molded surface

被引:8
|
作者
Gim, Jinsu [1 ]
Rhee, Byungohk [2 ]
机构
[1] Seoul Natl Univ, Ctr Coating Mat & Proc, Engn Res Ctr, Seoul 08826, South Korea
[2] Ajou Univ, Dept Mech Engn, Suwon 16499, South Korea
基金
新加坡国家研究基金会;
关键词
gloss defect; shrinkage; melt pressure; surface stiffness; injection molding; FLOW MARKS; CRYSTALLIZATION; VISCOELASTICITY; QUALITY; ABS;
D O I
10.1007/s13367-020-0018-1
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
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.
引用
收藏
页码:183 / 194
页数:12
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