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Measuring nozzle for determining the extensional viscosity of polymer melts

机译:用于确定聚合物熔体拉伸粘度的测量喷嘴

摘要

A measuring nozzle for determining the extensional viscosity of polymer melts during their processing with a flow channel having a rectangular cross-section is provided, which has a transition section (3) between an inlet section (1) and an outlet section (2) of constant cross section, respectively, between two opposite channel walls (6, 7) in the flow direction (10) hyperbolic tapers. In order to provide advantageous measuring conditions, it is proposed that the transition section (3) has an inlet-side zone (4) in which the mutual distance of the two channel walls (8, 9) between the two hyperbolic channel walls (6, 7) in the flow direction (10 ), and an adjoining outlet-side zone (5), in which two of the pairwise opposite channel walls (6, 7 and 8, 9) parallel to each other, while the two between the parallel channel walls (6, 7) arranged Channel walls (8, 9) in the flow direction (10) hyperbolic converge.
机译:提供了一种用于确定聚合物熔体在其加工过程中利用具有矩形横截面的流动通道的拉伸粘度的测量喷嘴,该测量喷嘴在聚合物的入口部分(1)和出口部分(2)之间具有过渡部分(3)。在两个相对的通道壁(6、7)之间,在流动方向(10)上的双曲线锥度分别为恒定的横截面。为了提供有利的测量条件,建议过渡段(3)具有入口侧区域(4),在该入口侧区域中,两个双曲线通道壁(6)之间的两个通道壁(8、9)的相互距离。 ,7)沿流动方向(10),以及邻接的出口侧区域(5),其中成对的相对的两个通道壁(6、7和8、9)彼此平行,而两者之间平行的通道壁(6、7)布置成在流动方向(10)上的通道壁(8、9)双曲线会聚。

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