Simulation for Mixing Process in the Solid Conveying Zone of a Twin-screw Extruder

Simulation of Distributive and Dispersive Mixing in a Co-rotating Twin-screw Extruder

Simulation results for mixing of two different polymers in a co-rotating twin-screw extruder are presented. Velocity distribution predicted by a threedimensional simulation of the flow is used to predict the change in the spatial distribution of initially segregated particles as well as the reduction in radius due to erosion. The predicted particle distribution is used to estimate the increase ...

Continuous Granulation with a Twin-Screw Extruder

Preparation of solid dispersion for ethenzamide-carbopol and theophylline-carbopol systems using a twin screw extruder.

In the present study, we prepared solid dispersions of water-insoluble and soluble drugs (ethenzamide (ETZ) and theophylline (THEO)) by the twin screw extruder method, which made it possible to control both kneading and heating at the same time under the fusion point of each drug, using three types of the controlled-release high-molecular-weight substance Carbopol (CAR) as the carrier. The soli...

Influence of initial conditions on distributive mixing in a twin flight single screw extruder

Passive advection of light particles carried by a high viscosity fluid in polymer processing equipment exhibits complex behavior due in part to the non-linearity of the equation of motion. The particles motion also exhibits sensitivity to the initial positions. A fundamental understanding of the influence of initial positions of particles on the quality and rate of distributive mixing is essent...

Simulation of Polymeric Flow in a Twin-screw Extruder: an Analysis of Elongational Viscosity Effects

Flow of a polymer in an intermeshing co-rotating twin-screw extruder is simulated. Effect of elongational viscosity on the flow is analyzed using independent powerlaw models for the shear and elongational viscosities. Axial component of the velocity is found to be maximum in the intermeshing region of the extruder. Axial component of velocity, which determines the throughput of the extruder, de...