Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Die swell"”.
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Development of the West Virginia University Small Microgravity Research Facility (WVU SMiRF)
… that was chosen was to determine the effects of die swell, or extrudate swell, in reduced gravity. Die swell is a viscoelastic phenomenon that occurs when a dilatant, or shear-thickening substance is forced through a sufficient constriction, or "die," such that the substance expands, or "swells," …
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Steady State Modeling and Dynamic Analysis of Film Blowing
… were more significant than the effect of die swell. In addition, crystallinity is shown to have a stabilizing effect on the system, with more crystallinity dampening the effect of perturbations. Stability diagrams for each material and model show reasonable results, with higher blow-up …
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Modeling of Dry Spinning of Polymer Fibers
… dry spinning model together with a die swell subroutine supplied by an industrial company has been used to generate predictions, which were compared to experimental data. Based on the analysis of the predictions and comparisons, we learn that phase separation cannot occur during dry …
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Computational modeling of fiber reinforced composites melt flow in nozzle extrudate for polymer deposition additive manufacturing.
… LAAM bead output properties (e.g., extrudate swell, fiber orientation, and effective elastic constants). The finite element method is applied to solve the flow kinematics and free surface shape of the nozzle-extrudate polymer melt that is defined by generalized Newtonian and viscoelastic flow …
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An experimental and numerical analysis of the exit flow in a slit die for polymer melts
A slit die has been constructed to use both flow birefringence and direct pressure measurements to study the extrapolated exit pressure (Px) and the exit pressure theory used to evaluate the magnitude of the primary normal stress difference (N1) from the value of the exit pressure. Flow …
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Creation of controlled polymer extrusion prediction methods in fused filament fabrication. An empirical model is presented for the prediction of geometric characteristics of polymer fused filament fabrication manufactured components
This thesis presents a model for the procedures of manufacturing Fused Filament Fabrication (FFF) components by calculating required process parameters using empirical equations. Such an empirical model has been required within the FFF field of research for a considerable amount of time and will …
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Characterisation of drug loaded insoluble polymeric matrices prepared by hot melt extrusion technology for drug delivery applications.
… pH range and represent a largely understudied category of materials as polymeric matrices for drug delivery.<br/>The physical and chemical characteristics of Eudragit RL PO were investigated showing good thermal stability at processing temperatures below 180°C. Above 180°C, thermal …