ENHANCING TISSUE WET PRESSING PERFORMANCE AND DRY END MATERIAL EFFICIENCY FOR COST SAVINGS, TAPPICon25

The steadily growing global tissue paper demand lays a foundation for new technologies targeting tissue production optimization as well as improved material and time efficiency. Tissue making is an especially energy-intensive field of paper industry, creating unique demands for performance in wet pressing and drying processes to cut energy usage. Intelligent roll technology offer new tools for tissue making for achieving these goals. These tools aim at improving press nip, moisture, and tension profiles, reeling nip and parent roll hardness profiles, rewinder runnability, and end product web handling characteristics in converting. They can be utilized in all the main processes and positions on tissue production lines. With these tools production cost reductions and energy savings can be obtained by optimizing the press nip to yankee cylinder contact, avoiding moisture profile errors requiring over drying with yankee hood and reducing reeling / winding broke under low nip load conditions typical to tissue wind-ups. The system consists of a helically mounted force or temperature sensors, roll covers, measurement electronics, digital radio transmission, and a receiver system connected to a user interface or the mill automation system. What distinguishes these implementations is that no layout changes or added external measurement devices are required, helping to fit into compact tissue machine environments regardless of the equipment type – traditional, hybrid or TAD (through air drying) concept. In tissue processing equipment the optimal positions for these rolls are press nip rollers, reeling cylinders, rewinder or converting line paper lead rolls or rewinder winding drums. In addition to these also temperature profile measurements are utilized, main application being the sheet temperature profile detection after yankee drying for moisture profile and drying process optimization. This paper introduces the applications of the said technology in tissue making from wet end to converting, illustrating the benefits with practical example cases and data sets.

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