Generation Mechanism of Tiger-striped Flow Mark in Injection Molding

OWADA Shigeru, YOKOI Hidetoshi

doi:10.11188/seisankenkyu.69.387

Bibliographic Information

Other Title

射出成形におけるタイガーストライプ・フローマークの生成メカニズム
シャシュツセイケイニオケルタイガーストライプ・フローマークノセイセイメカニズム

Search this article

Description

<p>As typical appearance failures appearing on the surface of injection molded products, there are flow marks with striped pattern (tiger stripe shape). These flow marks consist of glossy and cloudy bands appearing alternately on the surface of molded products. One major feature is that their phases are reversed on the front and back sides of the molded products. This paper aims to clarify generation mechanism of the flow mark by discussing typical analysis cases and our analysis results of the melt transcription process from the correlation between the surface features and the melt flow behavior by visualization using the flow front tracking system that is developed by the authors. In addition, measures against this failure are discussed based on the generation mechanism.</p>

Journal

SEISAN KENKYU

SEISAN KENKYU 69 (6), 387-397, 2017

Institute of Industrial Science The University of Tokyo