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首页> 外文期刊>成形加工: プラスチツク成形加工学会志 >Study on swelling behavior of polypropylene/polyethylene blends with good blow molding processability
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Study on swelling behavior of polypropylene/polyethylene blends with good blow molding processability

机译：具有良好吹塑加工性能的聚丙烯/聚乙烯共混物的溶胀性能研究

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摘要

The relationship between the swelling behavior and blow molding processability of polypropylene/polyethylene blends was investigated. Polypropylene (PP) and low - density polyethylene of different MFR (PE) were prepared by melt blending. A blow molding grade of high-density polyethylene (HDPE) was also used as a reference for blow molding processability. The swelling ratio of PP and PE increased with an increase in shear rate. On the other hand, the shear rate dependence of the swelling ratio of specific PP/PE blends and HDPE was very small. The mixture rule could not explain the swelling ratio behavior of PP/PE blends. The influence of slip phenomenon on swelling behavior was investigated. Slip phenomenon was observed for every sample, but its influence on the shear rate dependence of the swelling ratio was not significant. Parison extrusion characteristics were measured by using a pinch-off mold, and blow molding was also per formed. The parison weight of PP/PE blends with a small shear rate dependence of the swelling ratio changed linearly with the die gap. Therefore, the thickness distribution of the blow molded product changed slightly when the die gap was altered. The change of parison weight with an in crease of throughput was small The weight and thickness distribution of the product was also not influenced by the throughput. It was concluded that a small shear rate dependence of the swelling ratio was the reason for good blow molding processability and parison control.
机译：研究了聚丙烯/聚乙烯共混物的溶胀行为与吹塑加工性能之间的关系。通过熔融共混制备聚丙烯（PP）和不同MFR（PE）的低密度聚乙烯。吹塑级的高密度聚乙烯（HDPE）也用作吹塑加工性能的参考。 PP和PE的溶胀率随剪切速率的增加而增加。另一方面，特定PP / PE共混物和HDPE的溶胀率的剪切速率依赖性很小。混合规则无法解释PP / PE共混物的溶胀率行为。研究了滑移现象对溶胀行为的影响。对于每个样品均观察到滑动现象，但是其对膨胀率的剪切速率依赖性的影响不显着。使用夹断模具测量Parison的挤出特性，并且还进行吹塑。 PP / PE共混物的型坯重量与剪切率的关系很小，其膨胀率随模头间隙线性变化。因此，当改变模具间隙时，吹塑制品的厚度分布略有变化。型坯重量随通量增加的变化很小。产品的重量和厚度分布也不受通量的影响。结论是溶胀率的剪切速率依赖性小是吹塑加工性和型坯控制良好的原因。

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