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Improved Basis Weight Flow Control Drives Fiber Savings:
- $450K/year Fiber Savings
- Improved Wet End Stability (Machine Direction (MD) Short Term Variability Reduced)
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Typical Basis Weight Control Condition
It is common for paper, tissue and paperboard manufacturers to seek methods to improve basis weight control, with the eventual goal of creating true feed forward mechanisms for control at the reel. If successful, it is believed that feed forward control will reduce fiber requirements needed to meet paper property demands and improve machine availability (by reducing MD variability). At present, the papermakers are prevented from taking this step by the lack of measurement accuracy and repeatability of both the consistency and flow measurements used at the basis weight valve.
Many have attempted to move closer to feed forward by using microwave consistency monitors, in the hopes of tightening that portion of the control algorithms. Perceived advancements in filtering mag meter flow signals have also created hope. Although somewhat better, the sensitivity of the MCA to entrained air, the mag meters sensitivity to air and conductivity have caused these advancements to fall short of the requirements to improve MD control.
SONARtrac System Provides The Next Step
SONARtrac system's air compensated flow measurement now offers the papermaker the missing data needed to accurately reflect the mass flowrate leaving the basis weight valve and approaching the dilution loop. The SONARtrac system provides the MCA with the entrained air data needed to correct its consistency output while providing a flow signal that is immune to air or conductivity influences of the stock. Mass flow is now available!
Show Me The Money
The example below shows the advantage of tighter flow signal of the SONARtrac system. The system enabled this free sheet machine to reduce filtering time by an order of magnitude. This translated into $450K/year in fiber savings by reducing average stock flow by 0.5%.
If you would like to hear more details, please call CiDRA. We are eager to share details of how this innovative mass flow development can fit into your plans for driving cost out of your operation.
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