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July 24, 2006
Proof of Nip-Induced Tension in Winding
I was recently asked:
"Are there articles where nip-induced tension equation is developed and verified by experiment?
The simple equation is:
T(WOT) = T(WH) + COF*N
Where:
T(WOT) is the Wound-On Tension, in force per width (PLI or N/m) the sum of the web handling tension and nip-induced tension effect.
T(WH) is the web handling tension, also in force per width. It is the tension upstream of the nip roller or the winding tension for gap winding.
COF is the coefficient of friction between side A and side B of the web.
N is the nip force per width.
The best paper showing this theory and proof is:
Author: Dr. J. Keith Good
Title: “Modeling Nip Induced Tension in Wound Rolls”
Source: Proceedings of the Fourth International Conference on Web Handling, 1997.
There are several articles other papers, most published in past proceedings from IWEB (The International Conference on Web Handling), held in odd-numbered years at Oklahoma State University (OSU). These proceedings are available for purchase from OSU’s Web Handling Research Center.
In more advanced windig nip theory, they have found the COF*N over-estimates the nip-induced tension as the nip loads go above 10 PLI, but it is a good simple model to understand that nip create winding tension and increase roll tightness.
Posted by Tim Walker at July 24, 2006 03:40 PM
