Effect of Gas-assisted-foaming Mechanism and Vent-area Design on Bubble-microstructure and Shrinkage of Polystyrene Foam-Injection Molding

2020 IEEE Eurasia Conference on IOT, Communication and Engineering (ECICE) Pub Date : 2020-10-23 DOI:10.1109/ECICE50847.2020.9302009

Po-Wei Huang, H. Peng, Y. Ke, Po-Chih Chen, Jun-Hao Mao

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Abstract

This study investigates the effects of the vent-area on bubble-microstructure and shrinkage variation of gas-assisted foam-injection molding (GAFIM). The molding material is polystyrene (PS), and the gas foaming agent is nitrogen (N2). This study carried out the injection experiment with and without GAFIM to observe the molding characteristics of gas-filling pressure variation. In addition, the integration of vent-area volumes and cavity pressure measurement was developed to achieve foam growth and microstructure inside the sample to observe the effect of with and without vent-area on shrinkage variation and correlated pressure distribution near gate position during the filling process. The experimental results revealed that with the vent-area, the sample dimension shrinkage was relatively improved and the sample weight was reduced. On the other hand, the bubble-distribution increased with the changes in the volume of the vent-area and gas-filling pressure as the foam growth space increased.

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气助发泡机理及通气孔设计对聚苯乙烯泡沫注塑成型泡沫微观结构及收缩率的影响

研究了排气面积对气体辅助泡沫注射成型(GAFIM)气泡微观结构和收缩率变化的影响。成型材料为聚苯乙烯(PS)，气体发泡剂为氮气(N2)。本研究分别进行了加气和不加气的注射实验，观察充气压力变化的成型特性。此外，开发了通风区体积与空腔压力测量相结合的方法，实现了试样内部的泡沫生长和微观结构，观察了在充填过程中有无通风区对浇口位置附近收缩变化和相关压力分布的影响。实验结果表明，随着通气孔面积的增大，试样尺寸收缩率相对提高，试样重量减轻。另一方面，随着泡沫生长空间的增大，气泡分布随气孔面积和充气压力的变化而增大。

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2020 IEEE Eurasia Conference on IOT, Communication and Engineering (ECICE)

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