Short-Term Leveling at Card Delivery
topic
Short-term autoleveling uses a drafting arrangement before coiling, with an upstream measuring funnel (open-loop) or downstream sensor (closed-loop) to regulate drafting roller speed. The Trützschler system uses a 3-over-3 drafting arrangement with input and output measuring funnels. Short-term leveling can even short lengths but may not hold average count constant; closed-loop control has dead-time limitations for short-wave regulation.
Role
Short-term card leveling is rarely used in standard carding but has specific applications in processing comber noil and where card sliver feeds directly to rotor spinning machines, where short-term evenness is particularly critical.
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