Patent ID: 6955733

Claim:
A method for registering an off-line produced web having pre-produced objects longitudinally spaced at a pitch interval to a converting line manufacturing disposable absorbent articles, such as diapers, pants, feminine hygiene articles, and the like, or a component of a disposable absorbent article, the off-line produced web being manipulated as a controlled web in order for the pro-produced object of the controlled web to be registered in relation to a target position constant, the method comprising the steps of: a. providing a controlled web having pre-produced objects spaced at a controlled pitch interval, at a controlled velocity in a machine direction, b. providing an actual position data of the pre-produced object on the controlled web moving in the machine direction by detecting the pre-produced object by a sensor within a manufacturing cycle of the pitched unit operation; c. providing the target position constant at a desired position within the manufacturing cycle of the pitched unit operation; d. generating a correction signal based upon the actual position data and the target position constant; and e. adjusting the control velocity of the control web in order to register the pre-produced object of the controlled web in relation to the target position constant wherein the correction signal is calculated according to a formula u=K p *error+ K i *Σerror*Δ T wherein u is the correction signal, Kp is a proportional gain, Ki is a integral gain, error is an error signal, and ΔT is a time period between consecutive calculations.