Ab Akerlund & Rausing

Bo Ullman

Hangkan Ohlsson

A method and a device for inspecting a joint such as the joint at the rim of a container. Radiant energy is directed into a small area of irradiation on the joint and the container rim is moved relative to the radiant energy so that the area of irradiation moves in one direction along the rim. Additionally, the area of irradiation is scanned crosswise to the one direction to move the area of irradiation across the width of the joint. Radiant energy reflected from the area of irradiation is detected. This radiant energy indicates the characteristics of the joint. The characteristics indicated by the radiant energy are compared to predetermined set value characteristics to detect product residue or other defects in the joint.

Method and device for tightness control of a joint

A method and a device for inspecting a joint such as the joint at the rim of a container. Radiant energy is directed into a small area of irradiation on the joint and the container rim is moved relative to the radiant energy so that the area of irradiation moves in one direction along the rim. Additionally, the area of irradiation is scanned crosswise to the one direction to move the area of irradiation across the width of the joint. Radiant energy reflected from the area of irradiation or transmitted through the area of irradiation is detected. This radiant energy indicates the characteristics of the joint. The characteristics indicated by the radiant energy are compared to predetermined set value characteristics to detect product residue or other defects in the joint.

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.ANG.hus, Sweden

Bo Ullman