SU131181A1 - Etching method with the imposition of a sound floor - Google Patents

Description

The known methods of etching, including laying an acoustic or ultrasonic field on the pickling solution, do not provide a cliche of proper quality and require repetition of the etching operation with repeated guidance of the insulating layer.

The described etching method allows to intensify the process and provides a high-quality cliche in one etching operation, which improves the process efficiency.

This is achieved by imposing a sound field on the pickling solution in such a way that the sound waves are directed perpendicularly to the surface of the cliché surface.

The frequency of the directional sound field is 80-250 Hz, the amplitude of oscillations is 0.5-2.5 mm. However, it is possible to use lower frequencies and other vibration amplitudes.

Etching is carried out in a vibrating bottom bath, on which the cliché is being machined face up. The cliché edges must be precoated with a layer of insulating varnish with a thickness of 3-5 mm; it is advisable to maintain the thickness of the pickling solution above the cliché surface. 80-100 mm.

Each mode of sounding corresponds to the optimum temperature of the pickling solution, which is selected in each individual case by setting up preliminary experiments.

Subject invention

The etching method with the imposition of a sound field, characterized in that, in order to intensify the etching process of printing presses, a directed sound field is applied to the solution perpendicular to the surface of the cliche.