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NEW PAPER MACHINE CONTROL CHALLENGES IN WET END : CONSISTENCY CONTROL SOLUTIONS
Rantala, Timo,Nokelainen, Jukka,Huhtelin, Taisto,Sopenlehto, Taina 강원대학교 부설 창강제지 기술연구소 1998 제지기술 Vol.- No.12
With new dilution headboxes the CD variation of paper quality has been decreased significantly. At the same time fiber orientation can be controlled independently of basis weight control, when edge flow controls are available. The dilution headbox, utilizing white water as dilution water, brings changes to the structure of the short circulation. There are new interactions between subprocesses and control loops to be turned. When white water is used for dilution it means that its consistency level and short time variation affects on the dilution control performance. The dilution process gain depends on the consistency difference between headbox and dilution water. So it is quiet obvious that consistencies and consistency controls play a key role in stabilizing the short circulation and ensuring excellent performance of the CD control. The principles, applications, and practical results of the consistency controls on various paper machines with dilution headbox are presented.