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Measurement of Flow Properties
Factors Affecting Viscous Flow
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apparent viscosity appears average molecular weight BAGLEY barrel Benbow capillary chain branches Chapter component constant critical shear rate critical shear stress crystallisation decrease deformation dependence difﬁcult draw-down elastic effects elastic turbulence end correction equation extrudate ﬁgures ﬁlm ﬁrst ﬁxed FLOW ﬂow behaviour ﬂow curve ﬂow properties ﬂow rate fractions frozen-in high shear rates increase inﬂuence injection moulding Inst length linear low density polyethylene material measure melt elasticity melt ﬂow melt fracture melt viscosity molecular weight distribution molecules mould cavity neck-in Newtonian ﬂuid normal stress nylons observed obtained occur orientation output rate parison pipe Plast Plastics plot poly polyacetals polymer melts Polymer Processing polymethyl methacrylate polypropylene polystyrene power law power law ﬂuid pressure drop proﬁle pseudoplastic rheological rheometer rubber sharkskin shear stress sufﬁciently swell tensile thermoplastics thixotropic time-independent TORDELLA traction viscosity Trans tube velocity viscometer wall whilst zero