Transcription of Understanding Dancer Tension Control Systems - TAPPI
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Understanding Dancer Tension Control Systems - TAPPI
Presented by: Darrell WhitesideDirector Sales- Tension ControlMAGPOWRU nderstanding Dancer Tension Control Systems2 Manual Systems Closed loop Open loop Automatic systemsSystem Types3 FeedbackControl adjusts brake torque up or downBSensor measures tensionLCLoad Cell System4 DANCERCONTROLBRAKESENSORPOSITIONT ypical Dancer Control systemDancer Systems5 Why Use Dancers? Accumulation for Out-of-Round Rolls Accumulation for Indexing Applications Accumulation for Zero Speed Splicing6 DFPHow Dancers Work1stCommandment The load on the Dancer sets the Tension !2ndCommandment The load on the Dancer must not change!7+ MA + DV + KXTTLMX2T= LT = Web TensionL = Load Set by Loading Device+ Dancer WeightM = MassA = AccelerationD = Damping FactorV = VelocityK = Spring RateX = DeflectionIdeal Condition: 2T = LHow do we get there?
12 DFP Air Cylinder& Regulator • Velocity affects air cylinder & regulator combination • Pressure regulator can make or break dancer system • Must have sensitive relieving regulator (grab dancer arm & pull up quickly) Air Reservoir Recommended: Add an air reservoir between the regulator and cylinder.The reservoir volume must be much larger than the cylinder volume
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