Patent ID: 8152089
Filing Date: 2012-04-10
Classification: B65H

Abstract:
1. A method for controlling taper tension in the winding section of a web handling system, the method comprising the steps of: (a) inputting into PLC a material to be used in initial operation, along with operating tension and velocity; (b) transmitting the diameter value (data) of a roll, currently being wound, from a motor driver into the PLC; (c) establishing in the PLC a taper value (reduction in operating tension) to be achieved; (d) determining in the PLC the type of taper tension profile in consideration of the radial stress distribution and telescoping within the roll on the basis of data, including initial operating tension, roll diameter and taper value, which are collected from steps (a) to (c); and (e) producing in the PLC an electrical signal for taper tension according to the taper type determined in step (d) to control the pressure of the air cylinder of a dancer system through an E/P converter and to control taper tension through a tension meter or a loadcell, in which the taper tension control method satisfies the following equation: wherein the hybrid factor serves to select one of a linear taper tension profile and a hyperbolic taper tension profile based on an value between 1 and 0 and produces a taper tension profile, which is an intermediate type between the linear taper tension profile and the hyperbolic taper tension profile.