Patent ID: 7833460

Claim:
A method of rotational molding a plurality of molded parts, the method comprising: providing a plurality of molding chambers, each arranged for forming a respective one of the molded parts therein; joining the molding chambers with one another with vent gates, the vent gates each comprising a passage arranged such that the vent gates communicate gases between the molding chambers; placing a starting material into the molding chambers; heating and rotating the molding chambers such that the starting material forms the plurality of molded parts on walls of the molding chambers respectively; venting at least one of the molding chambers directly to a surrounding exterior through an exterior vent; venting other ones of the molding chambers via the vent gates through said at least one of the molding chambers to the surrounding exterior; cooling the material forming the plurality of molded parts; and releasing the plurality of molded parts from the molding chambers respectively.