IMPROVEMENTS TO PROCESS FOR MANUFACTURING INNER TUBES OF THE SO-CALLED PUNCTURE-PROOF TYPE FOR VEHICLE WHEELS AND SIMILAR AND PUNCTURE-PROOF INNER TUBES THUS OBTAINED

摘要

Inner tubes for pneumatic tires including a toric cushion made from an elastomer material having cells independent of each other. A process for manufacturing such inner tubes with a mold for preforming and vulcanizing semi-toric elements, the mold includes fingers for molding recessed cavities and an incorporated heating network, the preformed semi-toric elements having undergone a first vulcanization are then joined together and subjected to a second vulcanization in an appropriate apparatus.