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首页> 外文会议>5th International Conference on Thermoplastic Foam: FOAMS 2006 >OCCURRENCE OF SURFACE DEFECTS IN TPO INJECTION FOAMED AUTOMOTIVE PARTS
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OCCURRENCE OF SURFACE DEFECTS IN TPO INJECTION FOAMED AUTOMOTIVE PARTS

机译：TPO注塑汽车零件中表面缺陷的发生

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摘要

Surface defects in TPO injection foamed automotive parts have been investigated. Unlike typical flow marks such as tiger stripes that affect the surface quality of injected solid parts, jetting and silver streaks were the major problems encountered with the TPO foamed parts. To eliminate these surface defects, the origin of the problem was analyzed and systematic experiments were performed to study the effect of the melt rheometry and key injection parameters such as melt temperature, mold cooling and injection speed on the occurrence of the surface defects. Premature cell nucleation before the injection of the melt into the mold was believed to be the main cause of the surface defects. Therefore, methods that avoided injection of a two-phase mixture into the mold and forced cell nucleation to take place strictly in the mold were considered to improve the surface quality of the parts.
机译：已经研究了TPO注射发泡汽车零件的表面缺陷。与典型的流动痕迹（例如老虎条纹）会影响所注入的固体零件的表面质量不同，喷射和银纹是TPO发泡零件遇到的主要问题。为了消除这些表面缺陷，分析了问题的根源，并进行了系统的实验，以研究熔体流变学和关键注射参数（如熔体温度，模具冷却和注射速度）对表面缺陷发生的影响。据信在将熔体注入模具之前，过早的晶核形成是表面缺陷的主要原因。因此，考虑了避免两相混合物注入模具并严格在模具中强制进行细胞成核的方法，以提高零件的表面质量。

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