THE INFLUENCE OF THE RECYCLED POLYMERIC MATERIALS VISCO-ELASTICITY ON THE PIPE EXTRUSION HEAD DESIGN
NICOLETA TEODORESCU(1), MARIANA-FLORENTINA ŞTEFĂNESCU(1), MIHAIL RUSSU(1), ELENA-BEATRICE TĂNASE(1)
1. Polytechnic University of Bucharest, Faculty of Mechanical Engineering and Mechatronics, Process Equipment Department, Splaiul Independentei, no. 313, Bucharest, 060042, Romania
Abstract
There are summarized the experimental researches, previously performed, concerning viscous-elastic characteristics changes of PP due to recycling. There are presented, comparatively, the results for the virgin and 10 times recycled polypropylene. Using CAD-CAM it is studied the influence of the PP viscous-elastic characteristics changes due to recycling on the pipe extrusion head design, aiming to obtain a good extrusion product (expressed in the given case by the pipe dimensions stability). It resulted that it is compulsory to do experimental research to obtain the actual viscous-elastic properties of the polymer after many times recycles, because these properties affect significantly the output and the annular uniformity of the pipes thickness.