Patent ID: 7455259
Filing Date: 2008-11-25
Classification: B65H

Abstract:
1. A method for winding a paper or board web into a web roll of a selected roll hardness distribution, comprising the steps of: winding a paper or board web into a first web roll by leading the web through a winding nip defined between said web roll and a winding drum, the web defining a wrap angle as it passes through the nip, the wrap angle being the amount the web wraps the winding drum before entering the nip when the wrap angle is positive, or the amount the web wraps the web roll before entering the nip when the wrap angle is negative, the winding being performed with the wrap angle regulated according to a first wrap angle function with respect to the diameter of the web roll; measuring a hardness distribution of the first web roll; and in response to the measured hardness distribution, winding the paper or board web into a second web roll, the winding being performed with the wrap angle regulated according to a second wrap angle function with respect to the diameter of the web roll, the second wrap angle function being different than the first wrap angle function, and repeating the measurement of the hardness distribution and adjustment of wrap angle function until the selected roll hardness distribution is achieved.