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Paper machine wet endMachine direction With the help of TAPIO measurements MD basis weight variations caused by wires, other dewatering elements like foils, screens, fan pump, consistency control, headbox pressure variations, pressure pulses etc. can be detected, and the cause of the variations can be found out. With the help of PROMA and TAPIO BW control tuning is easy to audit. Cross direction In CD the wire itself, basis weight CD control, high-pressure showers, headbox recirculation flow, manifold tubing and other reasons can cause CD variations. CD variations can be either periodical or thin/heavy edges or other nonperiodic variations. With the help of TAPIO profile measurements the variations and their causes can be detected. The on line quality control systems can not measure the first few centimeters of the paper web, but the edges do often cause breaks anyhow. Actions When the causes of the variations are found, the actions can be taken to correct the faults. In the case of the wet end typical actions are wire comparisons, control (CD/MD) tuning, shower oscillating mechanism improvement or repair, return flow valve adjustment, foil angle adjustment etc. Due to the fact that all major machine builders and most major paper companies have the TAPIO PMA TAPIO measurements has become a de facto standard measurement in industry. Now this situation is in the process to get the final confirmation since TAPPI is currently working on to make TAPIO style basis weight measurements as an official TAPPI standard.How To Get the Financial Payback In Practise? >> Paper machine wet end & Press part>> Size press & Coating head >> Calenders & Paper Formation >> Quality control & On-Line vs. TAPIO measurements |
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