Patent ID: 7502661

Claim:
A method for calculating and optimizing the diameter of a paper or board web machine reel, in which a web is wound in a paper or board machine into machine reels on a reel-up, which are run on a slitter-winder to form customer rolls, whose desired diameter and width are determined according to customer need, and in which a continuous-trimming running mode is used in which a desired amount of web is run into a machine reel and, when needed, splicing is performed on the slitter-winder to produce customer rolls with a desired diameter size, the method comprising the steps of: determining the diameter of the machine reel to be wound on the paper or board machine on the basis of restrictions set by the customer on the location of a splice in the customer roll such that the amount of broke being produced from the machine reel is optimized, wherein information about the customer rolls to be slit is obtained from a production control system for calculating and optimizing a machine reel diameter instruction for the purpose of optimizing the diameter of the next machine reel, and calculated and optimized machine reel diameter instruction is set in a control system of the reel-up; and forming a machine reel on the paper or board machine according to the machine reel diameter instruction.