WASHING OF VULCANIZING MOLD

摘要

PURPOSE: To realize uniform ashing within a short time without applying restriction to the mold surface of a vulcanizing mold by constituting the reaction gas allowed to flow in a vacuum treatment tank of oxygen gas and halide gas and holding the pressure of the gas to low pressure within a predetermined range under the equilibrium of the inflow and outflow amts. of the gas. CONSTITUTION: One electrode 4 is allowed to protrude into a vacuum treatment tank 1 and an annular vulcanizing mold 15 is positioned around the electrode 4 as other electrode so as to be separated from the electrode 4 by a predetermined distance and plasma is generated only in the region between the surface of the vulcanizing electrode 15 to be cleaned and the surface of the electrode 4 and an insulator 8 is provided at the position covering the discharge region between both electrodes to prevent the generation of abnormal discharge. The reaction gas flowing in the vacuum treatment tank is constituted of oxygen gas and halide gas and the pressure of the gas in set to 0.1-10.0Torr under the equilibrium of the inflow and outflow amts. of the gas. By this constitution, the plasma region optimized to a tire tread pattern forming surface brings about uniform ashing.