Yearly Archives: 2014

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 […]

Article#6 fig3

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. […]

Article #5 Fig 3

Conveying Screw

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 […]

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, […]

Screw profile used for the experiments

RTD and velocity for die

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 […]

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. […]

SME and intrinsic viscosity_calculated vs experimental

Temperature & pressure analysis

Experiments of Classic PP Extrusion

As a classic thermoplastic, the polypropylene (PP) material presents a well known behaviour during the extrusion process. Its behaviour can be easily controlled during extrusion. In this context, the numerical simulation allows to quickly identify the key zones of the process. The PP behaviour in twin screw extrusion has been studied in many publications*. In […]

Why this Internet blog ?

This blog is intended for anyone, scientists, process engineers, R&D engineers, technicians, concerned by the Mixing and Extrusion processes simulation issues. This blog is populated by contributions & posts from SCC application engineers and scientists whose research work is focusing on mixing  process simulation. It has been originated by SCC (Sciences Computers Consultants) for providing […]

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