| 摘要 |
Process and apparatus for examining the porosity of coated objects, and in particular of enamelled, electrically conductive strip and profiled material or objects, and in particular of hollow bodies such as beverage cans, in which electrical contact is made with the strip and profiled material or the hollow body to form one pole for an applied test voltage, an electrically conductive connection is made to a coated surface of the strip and profiled material or to the hollow body by means of a continuous stream or curtain of electrolytic fluid emanating from a nozzle, to form the opposite pole for the applied test voltage and wherein the current flowing from the one pole through a stream or curtain of liquid and the coating to the other pole is measured as a measure of the porosity of the coating.
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