Method for detecting a liquid composition applied onto a cellulose blank structure with a detection system and a detection system

A method for detecting a liquid composition applied onto a fluffy cellulose blank structure, with a detection system, wherein the detection system is part of a cellulose product forming unit for forming non-flat cellulose products from the fluffy cellulose blank structure, wherein the detection system comprises a detection unit comprising an infrared thermal detection sensor connected to a control unit, the method comprising the steps of:

• providing the fluffy cellulose blank structure and feeding the fluffy cellulose blank structure in a feeding direction, wherein the fluffy cellulose blank structure upon feeding is moving through an application area comprising at least one spray nozzle and a detection area, wherein the application area is arranged upstream of the detection area;
• spraying the liquid composition onto the fluffy cellulose blank structure in the application area with the at least one spray nozzle;
• detecting the applied liquid composition in the detection area with the detection unit, wherein the detection by the detection unit includes forming a detection result, wherein the detection result is a temperature image of the detection area;
• analyzing the temperature image by the control unit, wherein the analysis of the temperature image includes forming an analysis result;
• and
• initiating a control action by the control unit upon detection of an analysis result deviating from a pre-determined analysis result.