초록 ▼

A method and apparatus for testing flexible sealed packages of the type wherein the package is at least partially made of a flexible, electrically conductive foil or metallic laminate wherein the capacitance between the flexible conductive foil or metallic laminated of the package and a fixed electr

A method and apparatus for testing flexible sealed packages of the type wherein the package is at least partially made of a flexible, electrically conductive foil or metallic laminate wherein the capacitance between the flexible conductive foil or metallic laminated of the package and a fixed electrode is measured when the package is subjected externally to a partial vacuum. The apparatus includes an evacuable chamber adapted to support a package under test therewithin so that at least part of the flexible foil or metallic laminate portion of the package lies opposite said fixed electrode and a means for monitoring the capacitance between the electrode and that part of the foil or metallic laminate when the chamber is evacuated.

대표청구항 ▼

Apparatus for testing fexible sealed packages of the blister pack type whose one side is made of an electrically non-conductive plastics material defining individual sealed blister compartments which are closed off by a common, flexible, electrically conductive foil defining the opposite side of the

Apparatus for testing fexible sealed packages of the blister pack type whose one side is made of an electrically non-conductive plastics material defining individual sealed blister compartments which are closed off by a common, flexible, electrically conductive foil defining the opposite side of the pack, the apparatus comprising: (a) a chamber adapted to support a package under test therewithin; (b) means for selectively evacuating the chamber; (c) a plurality of first fixed electrodes in said chamber positioned so as to lie opposite to the respective parts of the foil corresponding to the individual blisters when a blister pack under test is supported in the chamber; (d) a second fixed electrode in said chamber which, in use, lies on the non-conductive side of the pack whereby a series capacitance arrangement is obtained, with a first fixed capacitance (CF) being effectively formed between said second, fixed electrode and said flexible, electrically conductive foil of the package and a second variable capacitance (CP) being effectively formed between the flexible, electrically conductive foil of the package and said first fixed electrodes; and (e) a multiplexing means enabling sequential monitoring of the capacitance between the respective part of the foil or metallic laminate corresponding to each blister and the respective one of said first fixed electrodes.