MANUFACTURING OF HDPE PIPES. A CASE STUDY IN SETI PLASTICS, NEPAL
Devkota, Nishan (2018)
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This study aims to analyse the needs of process of producing HDPE (high quality density polyethylene) pipes in developing countries and investigate their current state of product’s mechanical properties such as strength, durability, thermal resistivity and the weight. A set of questionnaires was performed for understanding suppliers and consumers experience. Also, the processes and machines involved in the pipe production was studied. Qualitative and quantitative analysis were performed to investigate factors affecting the production rate and mechanical properties of pipes being produced. The project consisted of studying melt flow characteristics of HDPE and how the die structure should be set to get the desired HDPE pipes. The drag flow and pressure flow were then extracted from the screw parameters which lead into the calculation of the operation point and the operating pressure for the die. It was also possible to calculate the mass flow rate and the velocity drop. And finally die optimization of extruded circular profile is done. The results showed that the quality of HDPE pipes were good constituting durability and reliability of the products. The major problem observed in the study was the manual processes involved in the production lines which were adversely affecting the direct cost involved in the production. Furthermore, we can conclude that, automation of HDPE pipes production methods must be executed in developing countries to reduce the direct expenses involved in the production.