ROBERT , Laurent

The flow behavior of two molten linear high-density polyethylenes (HDPE) is carefully studied using a single screw extruder equipped with a transparent slit die. Flow curves are drawn for both resins and compared. Slit die experiments are performed using birefringence technique to obtain stress fields, and image analysis is developed to...

The oscillating flow instability of a molten linear high-density polyethylene is carefully studied using a single screw extruder equipped with a transparent slit die. Experiments are performed using laser Doppler velocimetry in order to obtain the local velocities field across the entire die width. At low flow rate, the extrusion is stable and...

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The spurt how behavior of a linear high-density polyethylene was carefully studied in capillary experiments. Depending on the flow conditions, new types of complex transients were observed. The study pointed out a second oscillating area, described by a second hysteresis cycle, close to or inside the classical one. In one case, the second...