Polymer Engineering and Science · 1998 · 13 citations · 9 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationPolymer EngineeringPolymer MaterialsFiber PropertiesPolymer CharacterizationPolymer CrystallinityPolymer Physical ChemistryPolymer PhysicsPolymer ProcessingContinuity Equation ModelingDensityFiber CrystallinityFiber SpinningPolyethylene TerephthalatePolymer Melt FlowPolymer MeltsVelocity
Abstract The density and crystallinity of polyester fiber were measured on the moving threadline during the melt spinning process. The density was calculated by applying the continuity equation at points along the length of the threadline. Experimental inputs to the equation included paralle, on‐line measurements of fiber diameter, fiber velocity, polymer mass flowrate, fiber temperature, and fiber birefringence. When spinning speeds exceeded 4500 m/min, a distinct rise in density occurred along the threadline. This rise corresponded with the rise in birefringence.
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