LSZ continually refines their products to include new technologies and signal processing techniques.  Here are a few of our published papers.

Building a Defect Free Reel   Adobe_PDF_file_icon_32x32

More crepe wrinkles in reels are experienced today due to larger diameter reels, more calendering to achieve a smoother finish, fillers causing increased paper density, and recycled furnish causing a lower coefficient of friction.

Reel density analysis and J-line testing are used to determine the quality of the parent reel. These tests identify the location of small crepe wrinkles in the paper. The Reel Density Monitor displays the density profile of the critical primary to secondary arm transfer, often showing a consistent density dip at the point of primary arm release. The wound in density profile is compared to the nip load between the reel and the reel drum, demonstrating the effect of the nip load on the density profile.

Examples are given from two paper machines to describe how this was used to diagnose reel build  problems and optimize the parameters that control reel build.

Winding And Reeling Quality And Productivity Optimization    Adobe_PDF_file_icon_32x32

A real-time parent reel or wound roll caliper and density measurement system has proved to be a valuable tool for monitoring, diagnosing and solving problems associated with the compression of paper during the reeling and winding process. Extremely precise roll diameter measurement, based on roll and drum rotation  sensing, is accurate and responsive enough to detect small changes in wound-in compression as the parent reel or roll builds.

Paper quality diagnostics include wound-in caliper and density profiles, which show the tightness of reeling or winding as a function of diameter. A new technique has been developed to obtain wound-in caliper profiles during the critical period when the reel is in the primary arms.

These on-line measurements, either portable or permanently installed, have been used to diagnose and solve crepe wrinkling, paper bursting and other roll structure or web break problems. Solving these problems has resulted in reduced paper waste in a number of mills.

This technology also serves as the measurement foundation for a diameter-based reel size optimization system. These systems reduce chronic reel overbuild and left-on-spool losses by providing precise, real-time diameter, caliper and density measurement. A reel turn-up alarm allows the backtenders to precisely make the correct amount of paper required for downstream winding process, with no excess wastage. The wastage monitoring systems have also been used in
complex finishing lines to determine the degree and location of slab-off losses from parent reels, during the supercalendering process and in winding. Precise diameter measurements, RFID spool tracking and winder cycle state inference allows automated allocation of time and slab loss amounts and types. Case studies, in single-line and multi-line mills, demonstrate loss reductions of 2 to 4 % of gross production.

Tracking and Optimizing Reel to Winder Producivity in a Supercalendered Paper Mill   Adobe_PDF_file_icon_32x32

Results of automated tracking and optimizing of dry end productivity for a papermill producing supercalendered grades and having multiple papermachines, supercalenders, winders and mixed process lines is reported. The use of modular operator and data collection stations, together with RFID or Bar-Code automated reel tracking and a central database, allowed all paper slab and machine time losses to be automatically followed through the process path. The resulting accurate, automated and quick display of trends of left-on-spool and other slab losses provides the information operators need to use the reel sizing calculator tools most effectively. Floor inventory data and production run tracking aid in order fulfillment accuracy and reduce the costs of over and under runs. Reliable loss data provides focused information needed to minimize dry end slab and time losses. Some unique challenges related to the widely differing wound-in-caliper changes for supercalendered versus non-supercalendered grades were encountered, and overcome. The combination of reliable and precise visibility of losses together with unique operator tools for optimal sizing and consumption of reels resulted in 1.5 to 2% reductions in dry paper losses. Unaccounted slab losses, from before and after implementation, are shown along with current detailed monitoring results.


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