Influence of Molding Conditions on the Formation of Microscopic Flow Marks on the Surface of Injection-Molded Parts.

DOI Web Site

Bibliographic Information

Other Title
  • プラスチック射出成形におけるマイクロフローマークの発生に及ぼす成形条件の影響
  • プラスチック シャシュツ セイケイ ニ オケル マイクロ フロー マーク ノ

Search this article

Description

In order to analyze the mechanism of the transcription in injection molding, the relationship between the molding conditions and the microscopic flow marks formed on the surface of molded parts of polycarbonate resin has been studied. The results obtained are as follows. (1) When the melt temperature, mold temperature and injecting velocity are low, microscopic flow marks more than 5 nm deep are formed on the surface of the injection-molded parts, and the molding transcription drops. (2) Such flow marks are caused by the cooling of melt resin at the melt front. That is, they are formed in the case that the temperature of the resin near the wall of the mold cooled to the no-flow temperature before that resin contacted the wall of the mold. (3) If those flow marks are eliminated, the molding transcription improves; then the surface roughness of the substrate of 3.2nm in Rmax is nearly equal to that of the stamper of 2.7nm in Rmax.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 49 (3), 241-248, 1992

    The Society of Polymer Science, Japan

Keywords

Details 詳細情報について

Report a problem

Back to top