Method and system for measuring the setting time of a gypsum board

A computer implemented method for in-line, realtime monitoring of the time-temperature profile of a continuously produced gypsum board in a gypsum board manufacturing line;

• wherein the method takes as input signals of a series of infrared sensors placed at given distances along the gypsum board manufacturing line between a moulding stage and a cutting stage of said gypsum board manufacturing line, and further takes as input a speed of the continuously produced gypsum board on the gypsum board manufacturing line;
• wherein the method provides as output a corrected time-temperature profile of the continuously produced gypsum board, the method further comprises the following steps:
• (a) converting the signals of the series of infrared sensors into a time-temperature profile based on the speed of the continuously produced gypsum board on the gypsum board manufacturing line;
• (b) processing the time-temperature profile through a correlation model and/or a physical model to calculate a corrected time-temperature profile;
• wherein the correlation model is obtained from a mapping between time-temperature profiles acquired by the same series of infrared sensors and time-temperature profiles by ex-situ measurements of Temperature Rise Set on at least one gypsum board which has similar physicochemical features to the continuously produced gypsum board;
• wherein the physical model is obtained from a mapping between a heat flow calculated from time-temperature profiles acquired by the same series of infrared sensors and a heat flow calculated from time-temperature profiles by ex-situ measurements of Temperature Rise Set on at least one gypsum board which has similar physicochemical features to the continuously produced gypsum board.