Method of producing a reinforced rubber hose by using a plastic mandrel

Abstract From the Canadian patent

A method of producing a reinforced rubber hose including, the steps of continuously extruding a long plastic mandrel from a plastic material and feeding the extruded plastic mandrel, extruding an unvulcanized inner rubber tube on the long plastic mandrel, forming a tubular reinforcing layer on the unvulcanized inner rubber tube, extruding an unvulcanized outer rubber tube on the tubular reinforcing layer, vulcanizing the unvulcanized rubber tubes thereby, preparing a long rubber hose formed on the long plastic mandrel, cutting the long rubber hose into short rubber hoses having a predetermined length, while concurrently cutting the long plastic mandrel into short plastic mandrels, removing …