Moisture management and optimization from headbox to reel in papermaking process, 19PaperCon
During the last decades the paper industry has made significant improvements in paper quality and production efficiency. Continuous developments in Quality Control Systems (QCS) are one reason for improvements. End users have increasing demands for quality at an optimized cost level with reduced basis weights. In that sense paper and board production faces many challenges in terms of energy, production and quality. Traditionally, QCS has focused on measuring the final quality of the paper, but increasing demands create a need to monitor the process more comprehensively.
Moisture management along the papermaking process is one of the key parameters affecting machine speed, runnability and production costs. Measurements and awareness of dryness or moisture content from headbox to reel provides means to optimize the complete drying process in a new comprehensive way. Coordinated control of drying from wire to drying sections makes cost-optimized control decisions possible due to great energy saving potential between mechanical water removal and evaporative drying. To see the full picture of how the dryness of paper web is developing, embedded sensors in foil type construction are used in the wire section. In addition to that, multiple sensors installed along the machine from wet-press to final drying groups complete the moisture monitoring with the traditional scanning moisture measurement applications.
This paper will detail possibilities and experiences of wet end moisture measurements completing the moisture management in QCS system and how the information is utilized in daily production. The chosen measurement technologies are introduced. Also, recent measurement results and experiences will be presented.
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