The rotational molding process starts with a good quality mold that is placed in a molding machine that has a loading, heating, and cooling area.
Several molds may be placed on the machine at the same time. Pre-measured plastic resin is loaded into each mold, and then the molds are moved into the oven where they are slowly rotated on both the vertical and horizontal axis. The melting resin sticks to the hot mold and coats every surface evenly. The mold continues to rotate during the cooling cycle so the parts retain an even wall thickness.
Once the parts are cooled, they are released from the mold. The rotational speed, heating and cooling times are all controlled throughout the process.