Abstract: A device for spraying a single dose of a fluid in divided form includes a cylindrical tank (1) containing the dose of fluid, a piston (2) sliding in the cylindrical tank (1), a pusher for the piston (2), and outlet passage (5, 6) capable of communicating with the cylindrical tank (1). The piston (2) is displaceable relative to the pusher between a storage position, in which it prevents communication between the outlet passage (5, 6) and the cylindrical tank (1), and an actuation position, in which it puts the outlet passage (5, 6) into communication with the cylindrical tank (1). According to one aspect of the invention, the piston (2) is maintained in its storage position by wedging.

Abstract: A compressed gas device is disclosed for spraying a single dose of a fluid substance in finely divided form. The device comprises a tank containing the single dose having an inlet orifice for compressed gas, and an outlet orifice. The device further comprises a manually actuated gas pump having a gas supply communicating with the inlet orifice of the tank via an intermediate channel. The intermediate channel has a length of narrowed section that is closed in a sealed manner by a plug which is held in the narrowed section so that when the pressure of the gas supplied by the pump reaches a predetermined threshold, the plug is expelled towards the tank to open the intermediate channel. The device includes an abutment element to limit the displacement of the plug towards the outlet orifice of the tank of substance. The abutment element is constructed to guarantee that the compressed air can continue to floe through the outlet orifice when the plug is in its abutment position.

Abstract: A process for improving the surface condition and thickness regularity of a thin metal strip cast on a rotating wheel by injection of a molten metal having a free surface forming a meniscus in contact with the wheel. The process comprises detecting undulations or variations in thickness of the strip of at least 10 .mu.m, forming a gas cushion above the free surface utilizing a porous body disposed facing the free surface, and adjusting the pressure of the gas cushion, the location of the porous body or both to control the variations or undulations.

Abstract: The invention relates to a process for regulating the lubrication of the working face of the rolls of a continuous strip casting machine. The process is characterized in that, in order to operate the machine at the highest possible speed while avoiding excesses of lubricant or sticking phenomena, at least one beam of coherent light is directed on to the working face of each of the rolls or on the each of the faces of the strip or on to the face of a roll and the face of the strip opposite to said roll, the values of the mean strength and/or the frequency of the variations in the beam reflected by said faces are measured, said measured values are compared to values in reference intervals, and the speed of rotation of the rolls and/or the lubricant flow rate is adjusted in dependence on the location of said values with respect to said intervals. It finds application in all machines for casting material between rolls in which there is a wish to achieve a maximum level of productivity.