Influence of Flow Front Shape during Injection Molding on Groove Shape of Weld line in Injection Molding Part

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  • 射出成形品のウェルドライン形状に与える射出成形中のフローフロント形状の影響
  • シャシュツ セイケイヒン ノ ウェルドライン ケイジョウ ニ アタエル シャシュツ セイケイ チュウ ノ フローフロント ケイジョウ ノ エイキョウ

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Abstract

Weldline in injection molding is a serious problem that causes poor appearance and reduction of mechanical properties. Thus, in addition to position of weld line, it is important to predict the width and depth of weld line groove in design of molding parts. In this study, we investigated the relationship between molding conditions and weld line groove using polystyrene injection molded plate, which has counter flow weld. Moreover, resin flow in weld part during injection molding was observed and the relationship between the depth of weld line groove and shape of flow front was investigated. In the results of experiment, with the increase in temperature of mold, the width and depth of weld groove decreased. In addition, the width and depth of weld line groove changed with injection rate conditions, and it was shown that weld line groove is affected by resin flow behavior. As observed result of resin flow, correlation was found between flow front lengthanddepthofwaneld groove. This result suggested the depth of weld line groove can be pre-dicted from the flow front length.

Journal

  • Seikei-Kakou

    Seikei-Kakou 27 (11), 481-488, 2015-10-20

    The Japan Society of Polymer Processing

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