December 2009 PFFC

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Goldilocks and the Three Bears Deal with Traction Problems

Rollers are the hands of web handling — the hands we use to grip the web to meet our goals for web speed, position, and flatness. To be able to position the web, we need to “get a grip,” creating the frictional force between the web and each roller. How much grip or traction do we need? There's a famous children's story about a girl named Goldilocks and three bears. As the girl explores the vacant bears' home, everything seems to fall into one of three categories: “too much,” “too little,” or “just right.” I'd like you to ...

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