Exploring the strain transport formula
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The strain transport formula relates the velocity of a moving web to its strain. It is based on the conservation of mass which, when applied to webs, becomes the conservation of relaxed length. Simply stated it says, the velocity of a web divided by one plus its strain is a constant throughout the web path.This paper reviews many of the useful applications of the strain transport formula. While it is commonly used for strain and tension calculations, it can also be used to optimize a web path to minimize strain or tension variation, to calculate the elastic modulus of a running web, to calculate wound-in tension at an unwind or at a winder, and many other useful things.