VULCANIZING METHOD IN DOME TYPE VULCANIZING MACHINE

PURPOSE:To reduce an energy loss without steam being discharged outside, by performing vulcanization by casting high-temperature and high-pressure steam after extrusion of air in a steam box from the upper part of the top dome through the lower part of a bottom dome by flowing low pressure steam into the steam box among a top and the bottom domes and a vulcanizing mold which have been closed. CONSTITUTION:A raw tire 5 is held by a bladder from the inside along with carrying-in of the raw tire 5 on a released bottom vulcanizing mold 6. The along with closing of a top and bottom domes 7, 3 a top and the bottom vulcanizing molds 9, 6 are closed also and the raw tire 5 is held within these top and bottom vulcanizing molds 9, 6. Then inner pressure of a bladder is raised up to predetermined high pressure gradually by supplying a fluid within the bladder and the raw tire 5 is pressed against an embossing surface of the top and bottom molds 9, 6. Meanwhile, low pressure steam whose flow has been adjusted is streamed in a steam box 12 from a branched path 22 and inflow port 21 through an orifice 23. The steam which has been streamed in is replaced with air through the upper part of the steam box 12 gradually, the air is pushed downward and extruded outside through a discharge port 26.