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Measuring nozzle for determining the extensional viscosity of polymer melts
Measuring nozzle for determining the extensional viscosity of polymer melts
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机译:用于确定聚合物熔体拉伸粘度的测量喷嘴
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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.
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