Lonza Inc.

Willi Heusser

Hansjorg Furrer

Norbert Richle

A lubricant suspension is sprayed intermittently under high pressure by spray nozzle (4). Spray nozzle (4) operates like an excess pressure valve, by it opening automatically with the input pressure of the suspension exceeding a threshold value pressure and closing automatically in the case of the input pressure falling short of the threshold value pressure. The suspension is conveyed, without the interposition of a shutoff device, directly by pneumatically driven pump (2) to spray nozzle (4). The pump output pressure is maintained at a pause pressure in the pauses between the spraying intervals, is increased to the spraying pressure to spray the liquid, and is again lowered to the pause pressure at the end of the spraying interval. The pause pressure in this case is calculated so that it is just insufficient in value to open spray nozzle (4). The shutoff element subject to abrasion, previously necessary, between the pump and the spray nozzle becomes unnecessary by the pump pressure control according to the invention. The operating safety is significantly increased and the spraying starts immediately without delay when the pump pressure is increased.

Process and device for spraying a liquid intermittently, especially a

The device has a storage vessel (2) that is connected to a compressed gas pipe (1) and whose outlet (6) discharges through a shut-off element (7) into a carrier gas pipe (10). Shut-off element (7) and the setpoint values of a first pressure regulator (23) in compressed gas pipe (1), as well as a second pressure regulator (24) in carrier gas pipe (10), are controlled by a program control device (33) with a program memory (34), in which several programs that are selectable by a selector (37) for charging the carrier gas stream with varying amounts of material and/or material concentrations are stored. Each program contains time-driven switching commands for opening and closing shut-off element (7) and two different setpoint values for first and second pressure regulator (23, 24). With the device, the carrier gas stream, for example, for descaling hollow billets of varying dimensions, can be charged selectively with different, precisely measured amounts of material and material concentrations (amounts of material per carrier gas volume), by which charging with different amounts of material or material concentrations can be done in quick succession.

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Forch, Switzerland

Willi Heusser