Method for the plasma cleaning of the surface of a material coated with an organic substance and the installation for carrying out said method
First Claim
1. An installation for carrying out a process for cleaning the surface of a material coated with an organic substance, the process comprises introducing said material into a treatment chamber, having a pressure of between 10 mbar and 1 bar therein, which is supplied with a gas stream containing at least 90% oxygen by volume and generating a plasma by passing an electric discharge between the surface of said material and a dielectric-covered electrode, breaking down said organic substance through the action of the free radicals O. thus produced, where the material is in the form of a running strip and said introducing and generating operations are carried out continuously using installations placed in succession along the path of the running strip, the installation comprising:
- at least one module comprising a treatment chamber,means for setting the pressure inside said chamber to a value between 10 mbar and 1 bar,means for making said strip run through said chamber,a series of dielectric-covered electrodes placed so as to face that surface of said strip to be treated, where the electrodes are connected to a single sinusoidal high-voltage generator,a gas supplying unit that supplies said chamber with gas and a gas extraction unit that extracts, from said chamber, the gases resulting from the decomposition of the organic substance coating the strip, andUV emission lamps placed in an alternating order directly adjacent with said electrodes,wherein the UV emission lamps are configured to irradiate the strip at substantially the same time.
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Abstract
The invention relates to a method of cleaning the surface of a material that is coated with an organic substance. The inventive method is characterized in that it comprises the following steps, consisting in: introducing the material into a treatment chamber, having a pressure of between 10 mbar and 1 bar therein, which is supplied with a gas stream containing at least 90 volume percent of oxygen; and generating a plasma by passing an electric discharge between the surface of the material and a dielectric-covered electrode in order to break down the organic substance under the action of the free radicals O thus produces. The invention also relates to an installation that is used to carry out said method.
15 Citations
17 Claims
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1. An installation for carrying out a process for cleaning the surface of a material coated with an organic substance, the process comprises introducing said material into a treatment chamber, having a pressure of between 10 mbar and 1 bar therein, which is supplied with a gas stream containing at least 90% oxygen by volume and generating a plasma by passing an electric discharge between the surface of said material and a dielectric-covered electrode, breaking down said organic substance through the action of the free radicals O. thus produced, where the material is in the form of a running strip and said introducing and generating operations are carried out continuously using installations placed in succession along the path of the running strip, the installation comprising:
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at least one module comprising a treatment chamber, means for setting the pressure inside said chamber to a value between 10 mbar and 1 bar, means for making said strip run through said chamber, a series of dielectric-covered electrodes placed so as to face that surface of said strip to be treated, where the electrodes are connected to a single sinusoidal high-voltage generator, a gas supplying unit that supplies said chamber with gas and a gas extraction unit that extracts, from said chamber, the gases resulting from the decomposition of the organic substance coating the strip, and UV emission lamps placed in an alternating order directly adjacent with said electrodes, wherein the UV emission lamps are configured to irradiate the strip at substantially the same time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17)
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13. The installation as claimed in 10, wherein the process degreases the surface of metallic materials, and further comprises depositing a coating after said degreasing.
Specification