Patent ID: 7811414

Claim:
A method for determining a dry solids content of a web passing from a press section to a dryer section of a paper machine, the method comprising: measuring a dry mass flow m pap,d of the paper web; measuring a water mass flow contained in the web leaving a dryer section; measuring a temperature of the exhaust air from a hood; measuring a moisture of the exhaust air from the hood; measuring an amount of exhaust air from the hood; calculating a water mass flow m ev evaporated from the web in the dryer section based upon the temperature, moisture and amount of exhaust air from the hood; calculating a mass flow m H2O of water contained in the web passing from the press section to the dryer section by summing up the water mass flow contained in the web leaving the dryer section and the water mass flow of the water m ev evaporated from the web in the dryer section; and calculating the dry solids content DSC of the web passing from the press section to the dryer section by the formula: DSC=m pap,d /(m pap,d +m H2O ).