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Machine and cutting process for PP and PVC-U extrusion lines producing short pipes for indoor sewage



Plastic Pipes Conference Association # 2012 Barcelona

Giorgio Tabanelli and Marco Gulminelli

Piping systems for indoor sewage usually use PP and PVC-U socketed pipes with diameters no greater than 160 mm [6.30"]. The pipes are short in length in comparison to pipes used in outdoor sewage or in pressurised water distribution networks. Pipes less than three metres in length are produced, and there is a considerable demand for pipes shorter than 500 mm [1.64']. The technical evolution of extrusion lines is characterised by the constantly increasing extrusion speed, while the production of pipes for indoor sewage requires mainly short socketed pipes. In order not to reduce the extrusion speed of the line, it is necessary to increase the frequency that pipes are cut. The highest-performance traditional saws cut and chamfer pipes at a production rate no greater than 1000 pieces/hour. This impacts the productivity of a given extrusion line, and it might be necessary to increase the number of extrusion lines to obtain profitable production rates. To address this situation, a new type of cutting machine has recently been developed and integrated into numerous extrusion systems. This machine utilises a special cutting process that can achieve more than 2000 pieces/hour even when producing short pipes. This solution suggests significant potential for development within the field of pipe production lines for indoor sewage.

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