Abstract
A global computer model has been developed for starve-fed nonconventional single-screw extrusion. The model has been built by combining a new melt conveying model with recently developed melting models. Mixing screw equipped with dispersive mixing element of Maddock has been considered as an example for modeling. Extensive fully three-dimensional non-Newtonian Finite Element Method (FEM) computations have been performed to model the melt flow in mixing elements. Screw pumping characteristics have been computed and modeled for these elements at various power law indices. These characteristics have been implemented into the global model of the process. Computations were made for low-density polyethylene at various operating conditions. Fill factor, pressure, temperature, and melting profiles were simulated and validated experimentally. It has been confirmed by computation and experimentation that melting in starve-fed single-screw extruders is totally different compared with melting in flood-fed extruders. It is faster, and the screw length needed for melting extends with an increase of the flow rate. The screw is fully filled for some distance from the die only and starved beyond it. This distance is dependent on the flow rate and screw speed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
