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首页> 美国卫生研究院文献>Polymers >Warpage Reduction of Glass Fiber Reinforced Plastic Using Microcellular Foaming Process Applied Injection Molding
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Warpage Reduction of Glass Fiber Reinforced Plastic Using Microcellular Foaming Process Applied Injection Molding

机译：应用注射成型的微孔发泡工艺减少玻璃纤维增​​强塑料的翘曲

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摘要

This study analyzes the fundamental principles and characteristics of the microcellular foaming process (MCP) to minimize warpage in glass fiber reinforced polymer (GFRP), which is typically worse than that of a solid polymer. In order to confirm the tendency for warpage and the improvement of this phenomenon according to the glass fiber content (GFC), two factors associated with the reduction of the shrinkage difference and the non-directionalized fiber orientation were set as variables. The shrinkage was measured in the flow direction and transverse direction, and it was confirmed that the shrinkage difference between these two directions is the cause of warpage of GFRP specimens. In addition, by applying the MCP to injection molding, it was confirmed that warpage was improved by reducing the shrinkage difference. To further confirm these results, the effects of cell formation on shrinkage and fiber orientation were investigated using scanning electron microscopy, micro-CT observation, and cell morphology analysis. The micro-CT observations revealed that the fiber orientation was non-directional for the MCP. Moreover, it was determined that the mechanical and thermal properties were improved, based on measurements of the impact strength, tensile strength, flexural strength, and deflection temperature for the MCP.
机译：这项研究分析了微孔发泡工艺（MCP）的基本原理和特征，以最大程度地减少玻璃纤维增​​强聚合物（GFRP）中的翘曲，而翘曲通常比固态聚合物的翘曲更严重。为了确认根据玻璃纤维含量（GFC）的翘曲趋势和该现象的改善，将与收缩差的减小和非定向纤维取向有关的两个因素设置为变量。在流动方向和横向上测量收缩率，并且证实这两个方向之间的收缩率差异是GFRP样品翘曲的原因。另外，通过将MCP应用于注射成型，可以确认通过减小收缩率差而改善了翘曲。为了进一步证实这些结果，使用扫描电子显微镜，显微CT观察和细胞形态分析研究了细胞形成对收缩和纤维取向的影响。显微CT观察表明，MCP的纤维取向是非定向的。此外，基于对MCP的冲击强度，拉伸强度，弯曲强度和挠曲温度的测量，确定机械性能和热性能得到了改善。

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