Product spoilage caused by improperly closed packages cause serious problems for manufacturers, particularly those who deal in food. The cost of product returns and waste caused by contaminated or spoiled products can be significant. Our vision systems perform seal inspection on trays, packages and container closures to ensure products remain free from outside contamination.
Common seal defects include holes in the seal itself, product caught in the seal, and (more simply) improperly-applied seals. Another common defect is marring or unevenness in the sealing surface itself, which prevents a good seal.
Depending on a few factors – the seal type, the location, and the material the seal is made from – it is often enough for a camera to look for the presence of the seal material and identify any unusual markings. For clear seals, UV ink is often used to mark the seals, which cameras are able to spot by using specialized lights.
Completely clear seals are difficult to inspect, as the system may not be able to reliably spot holes or gaps. Foil or colored seals are far easier to spot flaws in, although depending on how reflective the surface is it may be necessary to utilize specialized lighting in order to provide a clear image.