Crystallization Modalities in Polymer Melt Processing by Hermann Janeschitz-Kriegl

Author:Hermann Janeschitz-Kriegl
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

3.3.1 Duct Flow Experiments

3.3.1.1 Short Term Shearing (“Step Strain”) Experiments [17]

For these measurements an ordinary single screw extruder has been adapted. A schematic presentation of the pertinent arrangement is given in Fig. 3.4. There are two essential parts. One of them is the lengthy duct of rectangular cross-section of large aspect ratio . This duct furnishes a practically two dimensional flow pattern, as the influence of the small side walls can be disregarded in the middle of the flow field. Near the end of this duct a pair of glass windows is placed in the opposite large duct walls. Near the entrance a pressure gauge is mounted flush in one of the large side walls. At the entrance a valve is placed. The second essential part is the accumulator. It is mounted on a reservoir, which connects the extruder with the duct. This accumulator is a tube with a honed inner surface, allowing a sliding fit to the plunger inside. This plunger is loaded over a lever with an exchangeable weight. The choice of this weight determines the pressure in the melt. At the lower end of the accumulator there is a second valve, which serves as a bypass.

Fig. 3.4Schematic presentation of the arrangement for the short term shearing experiment [17].

Courtesy of Hanser Verlag. Picture kindly provided by Prof. M Cakmak, Akron, when the author stayed there

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