Thinking Beyond the Basement, Paper360º July/August 2021

As industry understanding of dewatering has advanced, it has deepened the realization that the vacuum system should be flexible. Paper machine conditions change all the time. For example, machine speed can easily vary from 200 to 1,100 m/min, depending on basis weight and furnish; felt condition will change over its lifetime; and it’s not optimal to have the same amount of vacuum (-kPa and/or air flow) for different conditions. At Runtech Systems, more than 30 years of expe-rience tells us it is very important to be able to measure water removal (Fig. 1) and control the vacuum levels. We developed the Ecoflow dewatering measurement system as a tool for understand forming and press section dewatering and to show papermakers that it is possible to improve total dewatering by reducing Uhle box vacuums. We installed the first Ecoflows in the early 1990s, long before the nip dewatering trend started. Now more than 600 machines have been equipped with the Ecoflow system. 

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