Author Archives : Eric

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Scale-up challenge in reactive extrusion and compounding processes: 1D numerical simulation as a powerful tool

Reactive extrusion … is more and more used for compounding high performance polymers which have complex formulations that imply potential compatibilization issues. Therefore, using twin-screw extruder (TSE) as a continuous reactor in which chemical reactions facilitating the compatibilization is a solution. The main issue could turn up when passing from a well-controlled formulation at lab scale […]

Twin Screw Course America and Europe 2015

After the success of the first Twin Screw Course (TSC) Europe, organized on the French Riviera, SCC is proud to announce two upcoming TSC: the TSC America 2015, located in UMass Lowell (Lowell, MA, USA) on October 7th and 8th and the TSC Europe 2015, located on the French Riviera, on December 2nd and 3rd, […]

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Nanofillers: Optimization of the Processing Parameters for a Better Dispersion using 1D-Simulation

Nanoclay are nano-sized particles of layered mineral silicates. They are used as nanofillers to  mechanically reinforce  thermoplastic resins. The improvement of composite properties depends on the nanofillers dispersion  inside the polymer matrix which is reached by melt processing. Twin-screw extrusion, as traditionally used in industrial compounding, is the preferred method for processing thermoplastic/based composites. The objective of this […]

Predicting the reaction rate in a twin screw extruder

Twin screw extruders (TSEs) are widely used in chemical polymer modification or polymerization. Indeed, TSEs are continuous chemical reactors proposing an important mixing capability, even with highly viscous polymers. Their flexibility in the screw design and control of temperature is an asset for processing chemical reaction as they allow to control and favor residence time […]

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PP Peroxide-Induced Degradation: predicting the material behaviour

Polypropylene (PP) when polymerized exhibits a high molecular weight (MW) and, consequently, high viscosity, which might be tricky for its processability. To improve this latter, MW can be tailored by different degradation methods. One of the most popular is the degradation of the PP induced by peroxide, because it is a straightforward and cost-effective approach. […]

Predicting glass fibers breakage during twin screw extrusion

Glass fibers are compounded with polymers to enhance their mechanical performance since the 1960′s. This performance improvement is depending on the fibers length. Indeed, the longer the fiber is, the more resistant the composite will be. As they are processed by twin screw extrusion, the key point of the process is to save the fibers […]

Conveying Screw

Screw profile used for the experiments

Processing wood fibres in twin screw: interest of the numerical simulation

Processing wood fibres in a twin screw extruder is challenging as it requires a close control of the temperature and mixing efficiency: temperature has to be limited for avoiding burning the wood fibres mixing efficiency has to be important enough to disperse the fibres into the polymer matrix For a first analysis of the process, […]

Particles Tracking: a Powerful Method to Determine RTD in a Complex Flat Die

The design of dies for flat film applications involves to take into account many constraints. Among these, one key issue is the thermal degradation of polymer melt during extrusion. As the thermal degradation depends on both temperature and time, in this article, the focus is done on the Residence Time Distribution (RTD). Determining the residence […]

RTD and velocity for die

SME and intrinsic viscosity_calculated vs experimental

Starchy Product: Coupling SME and Viscosity for a Better Prediction

The extrusion of starchy products is a tricky process as it modifies the basic structure of the material (loss of the grain structure, degradation of amylose and amylopectin chains…). The objective of this study is to predict with Ludovic® the starch transformation considering the influence of the Specific Mechanical Energy (SME) on the intrinsic viscosity. […]