Abstract:
The invention relates to an irradiating device, especially for irradiating substrates with ultraviolet light which are provided with a coating that can be cured using ultraviolet light. The inventive device comprises a longitudinally extended 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 the 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) which is 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 stream (28).
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:
Before articles are fed to a step of electrostatic painting, they are first made to pass through the interior of a chilling chamber inside which the temperature is 5°C maximum, due to the effect of the presence of one or more cryogenic gas(es), in either liquid or gas form, selected from among those cryogenic gases whose boiling temperature is equal to, or lower than, said temperature value. Immediately after leaving said chilling chamber, the chilled articles are placed into an atmosphere containing water vapour before being fed to the step of electrostatic painting, a layer of frost having been formed on the surface of the articles from the condensation of water vapour contained in said atmosphere. An apparatus suitable for carrying out the process is also disclosed.
Abstract:
Before articles are fed to a step of electrostatic painting, they are first made to pass through the interior of a chilling chamber inside which the temperature is 5°C maximum, due to the effect of the presence of one or more cryogenic gas(es), in either liquid or gas form, selected from among those cryogenic gases whose boiling temperature is equal to, or lower than, said temperature value. Immediately after leaving said chilling chamber, the chilled articles are placed into an atmosphere containing water vapour before being fed to the step of electrostatic painting, a layer of frost having been formed on the surface of the articles from the condensation of water vapour contained in said atmosphere. An apparatus suitable for carrying out the process is also disclosed.