Long-Term Leveling (Count Maintenance)
topic
The most common principle measures sliver count at the delivery (using active pneumatic or mechanical sensors) and adjusts infeed roller speed via electronic regulating devices. This maintains average sliver count constant over lengths exceeding 20 m. It is an integral part of modern cards and is always used in production of carded yarns and in rotor spinning mills.
Role
Long-term leveling ensures consistent sliver count between cans and over production runs. It compensates for gradual changes in feed density, material characteristics, and environmental conditions that would otherwise cause count drift.
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