Abstract:
The invention relates to a cold light-UV-radiation device which is used for hardening of UV paints and UV printing ink on thermosensitive substrates (12, 13). The inventive device is used, for example, in installations for imprinting packaging films or in production lines for CD's (compact discs) and DVD's (digital versatile discs). In addition to UV radiation, a large portion of heat radiation (IR radiation) is also radiated on the substrate (12, 13) when using preart radiation devices. Said heat radiation often leads to deformations and embrittlements of the substrate. The invention makes it possible to effectively separate the UV radiation from the IR radiation. To this end, a high UV intensity accompanied by a low heat stress of the substrate is realized by using short radiation paths.
Abstract:
Es wird ein Verfahren zum thermischen Beschichten von Oberflächen von Werkstücken mit einem Strahl aus einem erhitzten Gas und einem verflüssigte Werkstoff unter gleichzeitiger Kühlung der Oberflächen mit einem Kohlendioxid enthaltenden und in einer Düse erzeugten Kühlstrahl beschrieben, wobei das Kohlendioxid der Düsenöffnung in flüssiger Form zugeführt wird. Zur Verbesserung der Qualität der mit einem solchen Verfahren beschichteten Produkte wird vorgeschlagen, dem Kohlendioxid vor oder beim Austritt aus der Düsenöffnung ein weiteres Medium mit einer kleineren Molmasse als Kohlendioxid zuzumischen.
Abstract:
Traitement de surface d'une pièce, et utilisation de ce traitement pour améliorer l'adhérence d'un revêtement déposé ensuite sur la pièce. Ce traitement consiste à soumettre la surface de ladite pièce (8) à l'action d'un plasma d'arc gazeux (10) et à refroidir immédiatement la surface ainsi traitée en projetant sur celle-ci un liquide de refroidissement se trouvant à une température proche de sa température de saturation. Dans certains cas, on dispose tout d'abord sur la pièce une couche de matière thermoplastique. La pièce peut être en résine époxyde renforcée par des fibres de verre, et être revêtue ensuite d'une matière céramique par exemple de carbure de bore, ou d'un métal (Al, W, Ni).
Abstract:
A method of coating a donor surface with a layer of thermoplastic particles, the method comprising: providing a supply of the thermoplastic particles suspended in a fluid, applying the fluid to the donor surface, in a manner to cause the particles suspended in the fluid to form a substantially continuous particle coating on the donor surface, causing fluid flow within an interior plenum of a housing over a portion of the donor surface partially disposed therein, the fluid flow being of sufficient magnitude to entrain particles that are not in direct contact with the donor surface and insufficient to entrain particles that are in direct contact therewith; and extracting from the plenum fluid and particles which are not in not direct contact with the donor surface, so as to leave adhering to the donor surface a particle coating that is substantially only a single particle deep.
Abstract:
A method to reduce the work function of a carbon-coated lanthanum hexaboride (LaB6) cathode wherein the exposed tip of the cathode is exposed to moisture between two heat treatments is provided. The work function may be reduced by 0.01 eV or more.
Abstract:
An apparatus and method for processing elongated sheet material through a plurality of processing stations including a cooling station for lowering the temperature of the sheet material. The cooling station includes a plurality of individually controllable cooling zones each for controlling a portion of the transverse width of the sheet material during passage through the cooling zone. The cooling zones each include a plurality of cooling fluid directing spray nozzles and a sensor for sensing the temperature of the portion of the sheet material onto which cooling fluid has been directed by the respective cooling zone. A controller responsive to the temperature sensed at each cooling zone is operable for independently controlling the flow of cooling fluid to the fluid spray nozzles of each cooling zone based upon a preset temperature setting of the controller.
Abstract:
The invention relates to an irradiating device, especially for irradiating with ultraviolet light substrates which are provided with a coating that can be cured using ultraviolet light. The inventive device comprises a longitudinally extending radiation source (12) which is provided for emitting ultraviolet and/or visible electromagnetic radiation, which is arranged in a housing (10) between a reflector (18) and a housing opening (14) that can be aligned with an object (16) to be irradiated, and which is preferably configured as a tubular mercury discharge lamp. The inventive device also comprises a cooling system (20) for dissipating the waste heat generated by the radiation source (12). The aim of the invention is to create a compact modular construction and, optionally, an oxygen-reduced illumination zone. To this end, the invention provides that the cooling system (20) has a cooling circuit (26) arranged inside the housing (10) and which effects a circulatory cooling of the radiation source (12) by means of a force-conveyed, optionally oxygen-reduced cooling gas steam (28).
Abstract:
A cold light UV irradiation device is used for curing UV paint and UV printing dyes on heat-sensitive substrates (12,13). It is used, for example, in plants for printing on packaging foils or in the production line for CD□s (Compact Discs) and DVD□s (Digital Versatile Discs). The irradiation devices used until now emit in addition to the UV radiation also a high portion of heat radiation (IR Radiation) onto the substrate (12,13), which often leads to deformation and brittleness of the substrate. The present invention allows an effective separation of the UV radiation from the IR radiation. With short beam paths, a high UV intensity with a low heat load of the substrate is realized.
Abstract:
An apparatus and method for curing a coating applied to an optical fiber. A water-jacketed UV lamp is provided adjacent a first reflector. An optical fiber is drawn between a second reflector opposite the first reflector and at least one quartz plate, while a cross flow of a cooling gas is passed around the optical fiber. Apertures may be formed in the second reflector for passing the cooling gas while the optical fiber is passed between the second reflector and the at least one quartz plate. Alternatively, two or more quartz plates may be provided and the cooling gas and the optical fiber passed between the quartz plates. The cooling gas experiences laminar flow.