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. […]

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 […]

Temperature & pressure analysis