成形加工
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
30 巻, 12 号
選択された号の論文の13件中1~13を表示しています
目次
巻頭言
解説:特集 フィルムを加工する
講座―射出成形金型の機構と製作法(第 4 回)
技術報告
プリンキピア ―常識を変えたモノたちの物語―
日本の大学・試験・研究機関の研究 : 215
会議・見本市だより
論文
  • 大和田 茂, 横井 秀俊
    2018 年 30 巻 12 号 p. 642-649
    発行日: 2018/11/20
    公開日: 2020/08/25
    ジャーナル フリー

    Molded products using a hot runner can have peculiar defects such as flow marks, gate marks, flow imbalance, and the like, caused by melt staying in the manifold channel. These phenomena have been noted, but the systematic analysis of their generation mechanisms have not been adequately shown. In this study, we focused on the generation mechanism of concentric flow marks around the gate that were observed on the surface of molded products using acrylonitrile-butadiene-styrene resin (ABS) with a side-fed type hot runner mold. An analysis was conducted using a dynamic flowing visualization method developed by the authors and a two-color molding method. A correlation between these flow patterns and flow mark generation areas was then derived. A unique stagnant behavior of the flow front was observed in the filling process, and it was thought that this caused a change in the deformation of the rubber particles in the melt during the transcription process. Results indicate a glossy unevenness on the surface. The stagnant behavior of the flow front was presumed to be a phenomenon that occurs due to the reversal of the temperature distribution between the inner and the outer layers of the cavity when the low-temperature, high-viscosity resin stagnating around the valve pin of the hot runner begins flowing into the cavity.

学位取得者の紹介
feedback
Top