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首页> 外文期刊>Journal of Applied Polymer Science >Experimental study of the influences of the pellet shape on the bulk density and the frictional behavior of polypropylene
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Experimental study of the influences of the pellet shape on the bulk density and the frictional behavior of polypropylene

机译：粒料形状对聚丙烯堆积密度和摩擦性能影响的实验研究

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摘要

Bulk solids are the raw material for almost every polymeric thermoplastic product. Their properties determine the quality of solids conveying and also influence the melting behavior of the material in processing units. This study investigates the influence of pressure and temperature on the bulk density of two thermoplastic polypropylene pellets of different shapes. Furthermore, the external friction dependent on temperature and pressure of those materials is examined at conditions usually occurring in the solids conveying zone of smooth barrel plasticating units. The experiments are carried out using a tribometer for polymer pellets which was adapted for these tests by making the sample chamber, the piston, and the cylindrical roll heatable. The tests show that long cylindrical pellets exhibit low bulk densities at low pressure and temperature, which can be increased dramaticallyeven above the values of spheroidal pelletsas those parameters increase. Moreover, the external coefficient of friction is always higher for the long cylinders and strongly dependent on the temperature. Those facts add up and can cause a higher output of single-screw extruders. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42197.
机译：散装固体是几乎所有聚合热塑性产品的原料。它们的特性决定了固体输送的质量，也影响了加工单元中材料的熔化行为。这项研究调查了压力和温度对两种不同形状的热塑性聚丙烯颗粒的堆积密度的影响。此外，在通常在光滑机筒塑化单元的固体输送区中发生的条件下，检查取决于那些材料的温度和压力的外部摩擦。使用用于聚合物粒料的摩擦计进行实验，该摩擦计通过使样品室，活塞和圆柱辊可加热而适用于这些测试。测试表明，长圆柱形颗粒在低压和低温下表现出较低的堆密度，随着这些参数的增加，甚至可以超过球状颗粒的值，并且可以显着增加。此外，长气缸的外部摩擦系数始终较高，并且强烈依赖于温度。这些事实加起来并可能导致单螺杆挤出机的更高产量。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42197。

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