A pressing apparatus for producing a food service paperboard container from a paperboard blank so that the paperboard container possesses an overturned rim provided with folds includes a first die and a second die that are movable relative to one another. The first die includes a first base and a first...http://www.google.es/patents/US6932753?utm_source=gb-gplus-sharePatente US6932753 - Food serving paperboard container pressing apparatus employing cast-in electrical heaters
