February 2010 PFFC

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Drawing Conclusions: Part II

Web Lines The principles of draw control usually create a good deal of confusion. Let’s pick up where we left off in my last column and see if we can move from drawing confusions to draw control conclusions. I set out a scenario where I asked you to predict the web’s strain in a draw zone. I eventually gave out three data points: the web speed at roller #1, the web speed at roller #2, and the strain of the web at roller #1. This info is enough to determine the system’s eventual steady-state condition, but without knowing ...

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