Machine vision solution for inspecting and checking the homogeneity of the adhesive bead on plastic trays. In the food sector it is strictly necessary to guarantee the quality of packaging, a fact that has a direct impact on the quality and preservation of food properties. Poor sealing contributes to drastic degeneration of the packaged product.

The element inspected is the assembly that forms the tray, a product composed of three different elements. On the one hand, there are two transparent plastic materials with different opacity and consistency: tray (structural element that gives firmness and shape, from here to be the main element) and sheet (superimposed product to generate the closure and allow the visualization of the product); and between them, the adhesive (material responsible for enabling the sealing process).

Inspection in plastic trays

The inspection by means of machine vision is carried out with a system located in the plane perpendicular to the circulation of the containers. With structured lighting, the ideal contrast is generated to detect possible discontinuities in the adhesive along the entire perimeter of the tray:

● Lack of material.

● Porosities.

● Homogeneity.

This solution allows validating the correct sealing of the trays, thus guaranteeing the adiabatic properties that the packaging must present. In order to generate the atmosphere of protection that allows for the proper preservation of food inside.