Master of Science
John P. Coulter
A novel additive manufacturing technique is proposed for printing polymers with
controlled and spatially varying rheological properties. The technique, the Parallel Plates,
involves altering the flow area of the polymer melt inside the printing head and applying a
controlled shear on the polymer melt. The numerical simulations indicate that the shear
rates can be changed dramatically by confining the polymer flow to specific thicknesses.
The ability to control shear rates on the polymer melt would provide a strategy for tunable
temporal control of melt rheology, which plays a critical role in the localized evolution of
molecular orientation (for all polymers) and crystallization kinetics (for semi-crystalline
polymers) during additive manufacturing processes.
An attempt of experimentation analysis has failed due to timing scheduling difficulties.
It is recommended to follow with the experimental analysis to validate the numerically
A numerical investigation of a novel profile extrusion technique has been done in
chapter 3 with the goal of reducing production time and cost. The technique of the
Regulated Die involves manipulating the extruded polymer into different paths with
different path diameter to control the production rate of each path. The numerical
simulations indicates the possibility of assembling such a technique physically to provide
control over the production rate of different parts using one extrusion machine.
Noor, Hussam Hashim, "Optimization of Polymer Products through Rheology under Extrusion Process" (2019). Theses and Dissertations. 5693.