Dryness Determination in Fibrous Web Production

The patent replaces mechanical/physical laboratory drying methods with a calculation-based system using measured variables (water amount, solids amount, evaporated water) to determine dryness. This substitution eliminates the time-consuming physical drying process while maintaining measurement accuracy through mathematical relationships.

The patent introduces intermediate measured variables (water amount at reel-up, solids amount at reel-up, evaporated water in dryer hood) as mediators to calculate dryness indirectly. This intermediary approach allows real-time determination without direct physical sampling and drying, resolving the time contradiction.

The patent performs preliminary measurement of water and solids amounts at the reel-up position before the web enters the dangerous Yankee cylinder region. This preliminary action allows dryness calculation without physical contact with the hazardous area, eliminating damage risks while maintaining measurement capability.

The patent uses the reel-up position as an intermediary measurement point, located safely away from the Yankee cylinder and felt. Measurements taken at this intermediate location avoid direct contact with vulnerable components, preventing damage while providing sufficient data for dryness determination.

The patent implements feedback control by continuously measuring water amount, solids amount, and evaporated water, then calculating dryness in real-time to regulate the drying process. This feedback mechanism enables automatic adjustment without complex intervention systems, achieving real-time control through straightforward measurement and calculation loops.

The system performs self-service by automatically calculating dryness from measured variables and using this information for self-regulation of the drying process. This self-service capability achieves real-time control without requiring complex external control systems or manual intervention.