Controlling the moisture,mullen and basis weight of paper

Abstract

Abstract METHOD AND SYSTEMS FOR CONTROLLING THE MOISTURE CONTENT, THE MULLEN, AND THE BASIS WEIGHT OF A PAPER WHEREBY EACH IS MEASURED AND IF CORRECTIONS ARE REQUIRED, A COMPUTER BY MEANS OF A SERIES OF CONTROLLERS DEVELOPS THE APPROPRIATE CONTROL SIGNAL QUANTITIES FOR ADJUSTING A PAPER MAKING MACHINE SO THAT THE DESIRED MEASUREMENTS ARE APPROXIMATED. INCLUDED ARE MOISTURE, MULLEN, AND BASIS WEIGHT CONTROLLERS, WHICH, RESPECTIVELY, VARY THE STEAM SUPPLY TO A PAPER DRYER, THE ENERGY INPUT PER FIBER SUPPLIED BY A PAPER PULP REFINER, AND THE FIBER FLOW TO A HEAD BOX FOR THE MACHINE. THE CORRECTIONS TO ADAPT THEM FOR USE IN MAKING THE ADJUSTMENTS ARE CONVERTED TO CORRESPONDING CONTROL SIGNAL QUANTITIES AND THEN EMPLOYED TO MAKE THE REQUIRED CORRECTION. BECAUSE OF THE INFLUENCE OF MEASUREMENT CHANGES ON EACH OTHER, COMPENSATIONS ARE MADE IN EACH CORRECTION. ALSO PROVISIONS ARE MADE FOR MONITORING REFINER OPERATION IN AN ALTERNATIVE WAY UPON THE OCCURRENCE OF A CERTAIN CONDITION, SUCH AS A MALFUNCTION, FOR PERIODCALLY CHECKING SOME OF THE MEASUREMENTS TO INSURE AGAINST THE MEASURING MEDIUM''S DEGENERATION, AND FOR BOTH ADJUSTING MACHINE SPEED AND COMPENSATING FOR CHANGES IN MACHINE SPEED.

Inventors

• 👤 Frederick A Rummel
• 👤 Richard J Shields

Bibliographic Details