24 PRODUCTS & SERVICES


Pulp Paper & Logistics


Tissue log saw offers improved downstream performance


includes two new technologies to improve the performance of both the saw and downstream packaging equipment. Using patent-pending SmartFlow


T


technology, the Xcut saw provides both independent lane control and independent flight control to eliminate air cuts and increase saw speed. The more robust Xcut is said to be easier to maintain, while still approaching production rates that were previously only achievable by complex continuous-motion log saws.


When feeding multiple packaging machines, SmartFlow can be used to balance and manage the flow of rolls downstream. If one packaging machine goes down, the logs being cut in the lanes feeding that machine will complete the cutting process, and the accumulator will stop feeding


he latest design of tissue log saw from Paper Converting Machine Company (PCMC),


logs into the affected lanes. If subsequent logs had already been loaded into the affected lanes but had not yet begun the cutting process, the logs will remain there until the packaging machine is ready and the other lanes also have logs loaded and ready to cut. The accumulator will resume loading logs into the affected lanes when the packaging machine is ready and the affected lanes are clear of logs. The saw continues cutting logs in the other lanes without interruption throughout this process. In addition, the patented Xcut includes an option for a diverter- like controllability, which allows


Wet end operations better optimised with digital controls


Complete digital control over wet-end operations, optimising productivity and profit for paper mills, is provided by the latest generation of ABB’s Advanced Process Control (APC). Wet End Control stabilises the


wet-end process and reduces variability by controlling, monitoring and optimising retention performance. ABB says the system uses a multivariable model predictive control approach to predict future wet end process behaviour, making automatic adjustments to stabilise ash levels, reduce white water consistency variability and minimise chemical and filler dosages. This results in improved machine runnability by helping to reduce sheet breaks, and


July/August 2020


usage, ultimately reducing the environmental impact and leading to lower steam consumption and increased energy savings. “We know that continuous monitoring of wet end operations is crucial to driving process improvements,” said Ramesh Satini, global product manager for pulp & paper control systems at ABB. “We developed our Wet End


ABB Wet End Control in action


accelerating grade changes and break recovery. Papermakers can then track performance from the wet end to the final sheet. Wet End Control is available as a subscription-based service delivered through ABB Ability Collaborative Operations, with


structured remote monitoring and expert analysis of control performance for sustainable results.


In addition to its impact on


productivity, Wet End Control helps to minimise raw material, chemical costs and broke


Control solution to address this need by automatically managing targets and implementing cost efficiencies within process constraints. By adopting this ABB service, mills will benefit from ongoing insight and collaboration to optimise stability for long-term gains and minimised operator interventions.”


for infeed lanes to be controlled independently. A single lane can be turned off or on in the span of one or two logs. When paired with SmartFlow, this on-demand, independent lane control balances roll output to downstream packaging equipment, preventing backlogs. “These key features allow


for increased saw speed and a more controlled downstream performance,” said Jonathon Zahn, lead mechanical engineer for the Xcut. “Instead of sacrificing one for the other, you get both.” PCMC is part of Barry-Wehmiller, and based in Green Bay, Wisconsin, USA.


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