Abstract
Long-term control of card-web linear density is common in industry. The use of closed-loop control only for lengths greater than about 50 m is due to the inherent control problems resulting from measurement delays. It is shown experimentally that, by measuring the thickness of the web on the doffer, these measurement delays can be minimised. To use this signal, however, control must be exercised by varying the doffer speed. It is shown that, owing to variations in doffer-collection efficiency with doffer speed, a delay is introduced. This can be overcome by using a correction signal obtained from the card-cylinder-web thickness.
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