DECONTAMINATION PLASMA PLANT

摘要

The invention relates to a decontamination plasma plant, which inactivates fungi and bacteria on fragile bidimensional objects, paper, parchment, photographs placed in plasma, while preserving their physical-chemical characteristics and their original aspect. According to the invention, the installation consists of a reaction vessel (1) in which an object (33) to be decontaminated is introduced, the reaction vessel (1) having the shape of a bell of Pyrex glass with vertical axis, which is tightly placed on a stainless steel plate (2) which allows the connection, through a pipe (6), to a gas source (12) provided with a reducer (13), a flowmeter (14) and a needle valve (15), to a vacuum pump (8), a vacuometer (11), a de-aerator (9) and to a generator (G) of high frequency of 13.5 MHz, inside the vessel (1) there being a detachable module (A), made of two coaxial circular electrodes (17 and 18), made of stainless steel mesh, supported on some teflon rods (19, 20 and 21), provided with two cylindrical frameworks (25 and 26), welded along the circumference, electrically connected through some kanthal wires (29 and 30), covered by a teflon insulation (31 and 32), to the generator (G), which produces an active plasma (a) between the electrodes (17 and 18), the reactive species generated - ions, radicals, electrons - being entrained by the gas flow, as well as by the electrode construction and placement, as plasma (b), towards the object (33) subjected to decontamination, which, for this purpose, is placed on a duralumin disk (34) with some perforations (c), with the possibility of adjusting the distance in relation to the lower electrode (18) in order to optimize the treatment, with a sleeve (35) integral with the disk (34), which slides on the teflon rod (19), and a fixing screw (36), the monitoring of the reactive species in plasma (a), and of the plasma (b), being performed with a spectrophotometer (38) connected, by means of an optical fiber probe (39) to a quartz window (40), applied over an orifice (d) cut into the plate (2).