Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1998-04-10
2000-08-08
Gorgos, Kathryn
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
42218604, 4221861, 42218621, B01J 1908, B01J 1912
Patent
active
060998105
DESCRIPTION:
BRIEF SUMMARY
Apparatuses for single-sided or else double-sided processing of flat substrates, for example endless films or sheet ware made from plastic, paper, metal etc., frequently comprise corona stations.
Corona stations for processing these substrates comprise at least one electrode connected to a high-voltage supply, and at least one counter-electrode, which is generally earthed. For the most part, a plurality of electrodes and one counter-electrode are used. The substrate to be processed is led along between the electrodes connected to the high-voltage supply and the earthed counter-electrode, the substrate generally being against the counter-electrode. The substrate is thus situated in the spark gap.
The electrodes (in what follows, "electrode" is always understood as the electrode connected to the high voltage), the flow-carrying cables of the electrodes, and the insulators are essentially surrounded by a housing device in order to protect the operating staff against the high voltage and also to prevent damage to the electrodes, cables and insulators. The housing devices are frequently essentially cuboidal chambers, it being the case that the electrodes are located on the one side of the chamber, and the connection for the high-voltage supply is located on a neighbouring or on the opposite side of the electrodes.
During the corona discharge, the electrodes become hot, with the result that the corona stations generally comprise devices for producing gas flows which ensure that air or another gas mixture is led along the electrodes. These devices likewise have the purpose of removing the ozone produced by the corona discharge from the ambient air. These devices are extraction units which are connected to the chamber. They are used to suck air or another gas mixture into the space in which the corona discharge occurs, past the electrodes through the chamber to the extraction opening, as a result of which the electrodes are cooled and the ozone produced during the corona discharge as well as other constituents possibly present in the air are extracted.
In these known apparatuses, defects such as short circuiting, burning or destruction of the insulators occur sooner or later in the corona station. These defects occur in a period of from a few months up to two years after installation, depending on the electric loading and dirt loading. They are to be ascribed essentially to the fact that dirt, solvents, dust, fibres, adhesive remnants etc. are transported into the chamber, where they are deposited in part and destroy the electrodes, connecting means, insulators etc. These defects lead to substantial production losses, since then, for example, the entire printing machine lines come to a standstill.
Since the essential portion of the contamination stems from the substrate, the "web", to be processed, special web cleaning units are connected upstream, in order to prevent the effects of contamination and the defects occurring thereby. Despite the use of these additional cleaning units, which do, after all, also cause the dust particles are so strongly charged that they are easily detached from the material web and extracted. Air suction channels are provided for this purpose to the left and right of the spray electrodes, in order to extract the detached particles from the material web. Owing to the floating guidance of the material web between the spray electrodes and to the simultaneously acting air flows, uniform detachment and extraction of the dirt particles from the material web cannot be guaranteed, because of fluctuations of the material web in its course.
DE 42 12 549 C1 has disclosed an apparatus for electrically pretreating flat substrates, which has a corona station. A plurality of electrodes which are situated opposite a counter-electrode are arranged in a housing. The housing has an inner housing with a nozzle arrangement which accommodates the electrodes. Via this inner housing, a gas is fed onto the film past the electrode arrangement and extracted again by an extraction unit. The extraction unit is con
REFERENCES:
patent: 4774061 (1988-09-01), Ahlbrandt
patent: 4946568 (1990-08-01), Kalwar et al.
patent: 5224441 (1993-07-01), Felts et al.
patent: 5576076 (1996-11-01), Slootman et al.
English Abstract of JP6019246, Jan. 1994.
Arcotec Oberflachentechnik GmbH
Gorgos Kathryn
Nicolas Wesley A.
LandOfFree
Device for treating flat substrates by a corona station does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for treating flat substrates by a corona station, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for treating flat substrates by a corona station will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1147528