Method of monitoring the quality of absorbent sanitary articles, related production line and computer-program product

A method of analysing a quality of a welding area of an absorbent sanitary article, said welding area being generated by a welding station of a production line by generating a plurality of welding spots in said welding area according to a welding pattern, the method comprising the steps of:

• monitoring said welding area via a camera and a processing unit operatively connected to said camera, wherein said camera provides a sequence of images, and wherein a given area of pixel data of said images corresponds to said welding area;
• during a learning step, wherein a plurality of welding operations are performed under conditions resulting in at least one welding area of sufficient quality and with at least one welding area of insufficient quality, monitoring via said camera the welding area generated for each welding operation of the plurality of welding operations;
• during a training step, processing via said processing unit the images of said welding areas monitored during said learning step to determine for each image a given area of the pixel data corresponding to the welding area and for training a classifier of the processing unit using the respective pixel data of the respective weld area as input data of the classifier and a weld status as output of the classifier, whereby the classifier is configured to estimate a welding quality in the welding areas as a function of the respective pixel data of the respective welding area;
• and
• during a normal welding operating step, monitoring via said camera the welding area generated by the welding operation and estimating via said classifier of the processing unit, the respective welding quality.