December 2009 PFFC

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Dancer Rollers: Trust but verify

Web Lines In last month’s tension quiz, I gave out five points if your process had a calibrated tension transducer roller. Those of you with dancer rollers might have wondered why you didn’t get any points. Why am I “dissing” dancers? I like to know my web’s tension, and dancer rollers don’t tell you what the tension is or how much it varies. A dancer roller is not truly a tension feedback device. It doesn’t rise or fall because the tension is too high or too low. Dancers respond to errors in the speed ratio of the input ...

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