ETD

• Packaging and corrugated paper
• Paper and Card board Technology
• Paper machine
• Paper machines Press section
• Pulp and Paper
• Tissue Making

Conducted at Toscotec S.p.A., this thesis addresses critical operational challenges encountered during the start-up and optimization of high-speed tissue machines, with a specific focus on press section performance and mechanical integrity. The research targets three primary areas: the combined influence of press technology and mechanical integrity on dewatering efficiency; the impact of frame rebuilding accuracy on nip load distribution and structural stiffness; and the role of shoe press preventive maintenance—specifically belt condition, alignment, and lubrication—in ensuring reliability.
A comprehensive Root Cause Analysis (RCA) framework was developed, integrating on-site inspections, non-destructive testing, vibration analysis, and analytical modeling. This approach identified mechanical deviations that compromise dwell time uniformity and nip stability. Results demonstrate that insufficient structural stiffness leads to reduced dewatering efficiency and increased energy demand in the Yankee dryer system. Furthermore, the study confirms that rigorous shoe maintenance is decisive for maintaining stable nip conditions.
By bridging theoretical modeling with OEM design standards, this work establishes a traceable framework for industrial problem-solving. The thesis concludes that sustainable progress in the tissue industry requires aligning mechanical precision with data-driven maintenance. Future developments are proposed regarding suction press concepts and innovative shoe press designs to increase dwell time and pressure, thereby converging technological innovation with environmental efficiency.