Abstract

When competition is getting harder all the time, also the demand for quality gets higher. For that reason, paper machine suppliers are trying to find areas where you still can squeeze the last drop to get the best performance for your paper machine. Profiles are one area because conventionally systems which affect this parameter have been supplied by two or more independent suppliers: Paper Machine supplier supplies mechanical parts (headbox etc.) and automation supplier supplies actuator, CD control algorithms and gauging systems. This kind of deviation has involved that the control system lacks the paper machine supplier's point of view.In the following presentation, I will introduce to you Valmet's opinion of critical CD control systems which should be supplied by paper machine supplier and where we really need those advanced profile control systems. Items are CD dry weight control system for headbox (Jetmatic MT and Optiprofile), which also includes a good tool for troubleshooting in dry weight profile and CD moisture control on press section with Valmet steambox and Sym-ZS-roll.

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