Importance

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Abstract

A method of inspecting a container for the presence of adhesive in desired locations includes providing an ultraviolet light source which impinges ultraviolet light on the locations where adhesive is desired and sensors which receive fluorescent light from the adhesives and thereby determine which locations have the desired adhesives. The sensors emit signals which may be employed to directly or indirectly cause rejection of any container not having adhesive at the desired locations. It is preferred to use long wavelength ultraviolet light on the order of about 325 nm to 375 nm. The apparatus provides a container supporting member, an ultaviolet light source in overlying relationship with the container and sensors which receive light fluorescing in the adhesives at the desired locations. It is preferred that the ultraviolet light source means be disposed between the container and the sensors and that the sensors have a plurality of independent individual or sets of sensor units which are adapted to receive fluorescent light from a single source.

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First Claim