Rotational Lining Process Explained

After preparing the interior surface of the vessel (also known as the substrate, or what will become the exterior of the lined component), the vessel is mounted to a multi-axis machine.  Rotational grade polymer, which is in a granular form, is placed inside the metal substrate and then heated while being rotated about two perpendicular axes simultaneously.  During the heating cycle, the polymer particles melt and adhere to the metal substrate forming a thin, uniform layer of thermoplastic.  After a predetermined time at a specific temperature, all plastic is distributed over the interior surface of the part; the mold is then cooled by a combination of forced air and/or water mist.  In the case of rotational lining, the resin is allowed to solidify inside the substrate, creating a seamlessly lined complete assembly with a lining that is bonded to the substrate.  The resulting product can then be sealed, machined to tight tolerances or otherwise finished for the customer.