Process for the automatic checking and control of etching machin

Details Process for the automatic checking and control of etching machin Process for the automatic checking and control of etching machin

1974-01-30

1976-05-25

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

156345, C23F 102

Patent

active

039590461

ABSTRACT:
Process and apparatus for automatic checking and control of etching machines which provides a signal related to the strength of the etching solution and provides means whereby the length of etching time can be varied in relation to the concentration of the etching solution. The present invention provides a system including a measuring compartment through which an etching solution from the etching machine is constantly circulated. A measuring wire is inserted into the measuring compartment and held stationary therein for a time sufficient to cause the etching solution to etch away an end portion of the wire. The time required to etch off this end portion is measured and provides an analog signal of etching solution strength which is proportional to etching time. This signal can be used to control the feed of the etching machine so that as the solution becomes less concentrated, the time of exposure of the material being etched is increased.

REFERENCES:
patent: 3419446 (1968-12-01), Benton

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