Patent ID: 6368461
Filing Date: 2002-04-09
Classification: D21F,D21G,Y10S

Abstract:
A paper or cardboard machine for at least one of controlling and regulating a basis weight of a paper or cardboard web in a manufacturing process, comprising:at least one headbox that extends across a machine width, the at least one headbox being arrange to provide a machine-wide distribution of a material suspension onto one of a screen and between two screens; at least one material suspension supply being coupled to the at least one headbox and being arrange to supply a material suspension to the at least one headbox, the at least one material suspension supply having at least one concentration; at least one first control loop including at least one actuator being arranged to adjust the at least one concentration of the at least one material suspension supply, at least one detector being arranged for determining a basis weight of a finished web, at least one supply being arranged to modify the at least one concentration of the at least one material suspension supply, and at least one device being arranged to adjust the at least one actuator, whereby the at least one concentration of the at least one material suspension supply is adjusted; and at least one second control loop, comprising at least one sensor which is located within a wet area of the paper or cardboard machine, being arranged to regulate a concentration of the at least one material suspension supply.