Co-rotating twin-screw extruders : fundamentals, technology, by Klemens Kohlgrüber

By Klemens Kohlgrüber

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Occasional irregularities in the heating process or torsional stress on the two shafts can lead to mutual shifting and thus require clearances. Process engineering aspects can also require particular clearances if, for example, intensive shearing in the tip zones affects product quality. These different reasons for the need for clearances led to different strategies in their implementation: The clearances d (tip – wall) and S (tip – base of neighboring screw) should be set as trivial because they are radially effective.

For shear thinning fluids (0 n 1), the speed profile is flatter than for Newtonian fluids, while for shear-thickening (dilatant) fluids (n 1) it increases much more sharply. 2: Summary of the relations for Newtonian and shear thinning/shear thickening fluids in the case of a simple fully developed pipe flow (isothermal) [6], [14] Newtonian fluid Shear thinning/shear thickening fluid Rheological constitutive equation Shear stress at wall Shear stress Shear rate at wall Shear rate Max. velocity Velocity Pressure loss The residence time distribution also changes in the pipe in accordance with the flow profiles, depending on the rheological characteristics of the fluid: with increasing flow 0 the pipe exponent n, the width of the residence time distribution increases, i.

5 Influence of Molecular Parameters on Rheological Properties of Polymer Melts Important molecular parameters that influence the melt rheology of polymers are molar mass, molar mass distribution (polydispersity), and the degree of branching (molecular topology). A general empirical relation has been found for the dependence of (zero shear) viscosity on molar mass in the case of polymer melts, which applies for almost all polymers Mc a double and for concentrated polymer solutions [5]. 4. 16) 48 3 Rheological Properties of Polymer Melts [References on page 54] K is a polymer-specific constant which also depends on the reference temperature T0.

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