Abstract:
Para recubrir líquidos elásticos con una cuchilla sin la presencia de inestabilidad de flujo, la velocidad de flujo, la velocidad de extension en la region corriente arriba del lecho de revestimiento se mantiene baja incrementando la distancia sobre la cual el líquido debe acelérase. La aparicion de la inestabilidad de flujo de retarda que la interfaz líquido-aire corriente arriba del lecho de revestimiento sea relativamente blanda y plana. Esto se logra permitiendo que el liquido elástico tire de sí mismo sobre una distancia relativamente grande de un canal y hacia el pasaje cortante. El líquido es capaz de ascender hasta el pasaje cortante en virtud de la tension liquida desarrollada por el flujo extensional en la region corriente de arriba del techo de recubrimiento.
Abstract:
A method for forming a uniform, extremely thin film on the surface of plastics molded articles, films, sheets, synthetic paper, fibers, metal, and other objects, said film containing an anti-static agent, anti-fogging agent, anti-corrosive agent, mildewproofing agent, and the like. In the method a homogenous solution or emulsion is prepared by dissolving a surfactant and agents in a solvent such as water with the aid of ultrasonic energy or like, and the solution is made into an aerosol of fine particles by means of cavitation. The aerosol is brought into contact with an object, whereby the fine particles of aerosol are deposited on the object and a thin film of the solution is formed on the surface of the object due to the difference in surface tension between the surfactant and the object. After evaporation of the solvent, the agents are left on the surface of the object in the form of an extremely thin film. The specification discloses also apparatus for producing such an aerosol, selecting aerosol particles, and bringing the aerosol into contact with the surface of an object.
Abstract:
In a device for lacquering or coating plates (17) or panels through a capillary slot (24) filled with a liquid coating medium, the plate (17) is conveyed with the surface to be lacquered turned downwards, so that a thin layer deposits by capillarity on the plate (17).
Abstract:
The invention pertains to a device for lacquering or coating a substrate (29) using a component (12) with a capillary gap (13, 14), having a container (10) filled with lacquer or coating liquid, the component (12) being disposed within the container (10) so that the capillary gap (13, 14) is immersed in the lacquer or coating liquid and the lacquer or coating liquid feeds into the capillary gap (13, 14) from the container (10), and having means (44) for moving the outlet (40) of the capillary gap (13, 14) relative to the container (10) in the vertical direction (28).