Internal varnish coating for PVC pipe during extrusion



Instead of applying internal coatings after cooling, Faraplan has developed a process to spray powder resin during pipe extrusion at high temperatures, creating a stronger bond with the PVC. The innovation included development of a nozzle positioned in the zone ahead of the extrusion. The optimal coating can then take place during the forming of the extrusion, at 200 degrees Celsius on average, increasing the smoothness of the internal surface with a “lotus effect” and extending the life of the pipe. It allows more flexibility to change requested properties of resins, such as anti-noise, anti-odour, anti-bacterial and insulation. This could allow reduction of pipe thickness, cutting costs on raw materials.

Giancarlo Baù
+39 0445 899 500