Inspection device and method for inspecting an adhesive pattern on a substrate

A method, comprising:

• storing a pre-determined tolerance range for a desired adhesive pattern in a controller;
• receiving a discharge signal from a control unit of a nozzle for discharging the adhesive at the controller;
• determining, by the controller, the desired pattern based on the received discharge signal;
• receiving a change in the discharge signal;
• and
• setting the tolerance range for the desired pattern to a predetermined learning range.

An inspection device for inspecting an adhesive pattern on a substrate, the inspection device comprising:

• at least one sensor arrangement having a heat sensor head for detecting a pattern of an adhesive bead on the substrate when the substrate relative to the heat sensor head;
• and
• a controller being in electrical communication with said sensor arrangement, the controller storing:
• reference data representing a desired adhesive pattern;
• and
• a pre-determined tolerance range for the desired adhesive pattern;
• wherein the controller is configured to receive signals representing the pattern detected by the sensor arrangement and to compare said signals representing the detected adhesive pattern with the tolerance range of the desired adhesive pattern.