Models which can be used to calculate the internal stresses within wound rolls of web material have all been confirmed to the center winding technique to date. The mechanism by which a nip roller can increase the wound in tension in the outer layer of the wound roll is presented. Results of this work have been used to establish new winding models which can accurately predict the internal stresses within a center wound roll with an impinged nip.

Models which can be used to calculate the internal stresses within wound rolls of web material have all been confined to the center winding technique to date. In this publication, a new boundary condition is presented which will allow existing models to calculate the internal stresses within a wound roll which has been center wound with an undriven nip roller impinged upon the outside of the roll. Experimental verification of the new boundary condition is presented.

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