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Verfahren zur Elektronenbestrahlung von Schichten auf Oberflaechen von Objekten sowie Einrichtung zur Durchfuehrung des Verfahrens

Electron irradiation at atmospheric pressure, to alter object surfaces on an industrial scale.
: Panzer, S.; Mattausch, G.; Schiller, S.; Bartel, R.; Leffler, D.; Bobe, T.

Frontpage ()

DE 1998-19816246 A: 19980411
DE 1998-19816246 A: 19980411
WO 1999-DE337 A: 19990204
DE 19816246 C1: 19991230
Patent, Electronic Publication
Fraunhofer FEP ()

Die Erfindung betrifft ein Verfahren zur Elektronenbestrahlung von Schichten, die auf Objekten aufgebracht sind, oder von oberflaechennahen Bereichen von Objekten, mit dem die physikalischen und/oder chemischen Eigenschaften von Stoffen in der Oberflaeche oder in oberflaechennahen Bereichen veraendert werden. Die Erfindung betrifft weiterhin eine Einrichtung zur Durchfuehrung des Verfahrens. Das bevorzugte Anwendungsgebiet der Erfindung erstreckt sich auf die Haertung von Anstrichstoffen, beispielsweise von Farben und Lacken sowie von organisch/anorganischen Verbundsystemen, die auf Objekten mit dreidimensional geformten Oberflaechen aufgebracht sind. Die Einrichtung zur Durchfuehrung des Verfahrens ist robotertauglich und fuer einen breiten industriellen Anwendungsbereich wirtschaftlich einsetzbar.


WO 9952650 A UPAB: 19991210 NOVELTY - The object or applied layer is irradiated in portions optimally located with respect to the beam window. Following standardization of conditions, intensity profile i(x, y) in the window plane is selected. A required energy dosage is transmitted to the object. Relative movement takes place, at a defined speed of advance (v). Transmission is continuous or pulsed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for equipment carrying out the process. Preferred features: adjacent irradiated portions are combined as irradiation paths, relative motion taking place accordingly. Local instantaneous intensity profile and object orientation are selected. The longitudinal axis of the window and the path (vn) are maintained parallel during irradiation. Suitably-varied residence time under the beam, is achieved by programming. Inter- and intra path intensity profiles are tailored for the contours of the object. The irradiated location is inerted, by e.g. pure nitrogen, helium or their mixture. For strongly contoured objects, the helium content is increased. The gas is supplied locally to the irradiation region. To modify the power of irradiation, speed and path are varied and a two-dimensional static mask is interposed. The power is varied by pulse width (time) modulation. Adjacent passes cover the entire surface of the object. At adjacent boundaries of passes, energy input is determined by summing irradiations from each pass. The contour being irradiated is determined by a tracking digitizer, which is used to modulate intensity on-line. USE - To irradiate a plane or irregular object with electrons, varying its surface properties. Examples include hardening of coatings and composite coverings. ADVANTAGE - The equipment is suitable for computerized robotic control and can e.g. achieve rapid hardening of coating systems. The physical or chemical variation is carried out over a defined depth in the surface. The method is applicable to objects curved in three dimensions. Cost effectiveness and flexibility of electron irradiation equipment are increased, suiting it to a wide range of industrial applications.