Discussion
A winder whose reel diameter grows during the run needs
Answer: A
Correct answer: its speed reduced as the diameter increases
Linear speed is the rotational speed times the radius, so holding the web speed constant as the reel grows requires the rotational speed to fall in inverse proportion. The torque must rise at the same time to hold the tension, which is why a winder drive is usually specified in terms of constant power over a diameter range.
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