Test of polyvinylchloride pipes obtained by optimal extrusion degree orientation method

Abstract

The object of research in the article is unplasticized polyvinylchloride (UPVC) pipe with outer diameter of 90 mm and a wall thickness of 3,5 mm. Oriented PVC (PVC-O) pipes were made of this pipe. Parameters of these pipes: 110*2 , 9 mm; 125*2 , 5 mm; 140*2 mm. For this purpose it was determined with which optimal extrusion degree PVC-O pipe would have better properties and would be less expensive to manufacture than conventional UPVC pipe. To investigate the optimum extrusion degree it was chosen the acoustic emission research method because it provided the best necessary analytical data. The result to determine the optimal extrusion degree of PVC-O pipes were obtained during the studies and showed the right choice of research method was shown, namely: an optimal variant for obtaining PVC-O pipe from UPVC pipe 90*3,5 mm is the pipe with extrusion degree 1,4, namely 125*2,5, because it can simultaneously reduce wall thickness by 40% and have more time resource of exploitation to the destruction of 77 % compared to the dimension-type pipes 110*2,9 and 140*2,0, one of which has a rougher wall, which increases the cost of the pipe and the other has less time resource of exploitation to the destruction.