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4A – Web Starts with CD Error
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4 – Cross Direction (CD) Control
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4A – Web Starts with CD Error
Solutions
Web Starts with CD Error
4A Case 1: Incoming CD Offset
4A Case 2: Incoming Web Shifting or Oscillating
4A Case 3: Automatic Guiding Errors
CD Shifts Between Rollers
4B Case 1: Web-Roller Misalignment
4B Case 2: Roller Diameter Variations
4B Case 3: Uneven Nipping
4B Case 4: Uneven Frictional Contact
4B Case 5: Peeling Variations
4B Case 6: Cambered or Asymmetric Baggy Webs
4B Case 7: Thickness Profile
Web Converges Between Rollers
4C Case 1: Roller Deflection
4C Case 2: Slipping Concave or Non-Slipping Convex Roller
4C Case 3: Nips with Low Edge Loads
4C Case 4: Twisting
4C Case 5: Baggy Lanes
4C Case 6: Width Expansion in Span
CD Slips/Shifts on Rollers
4D Case 1: Micro-Slippage from Strain Change
4D Case 2: Insufficient Traction for Perpendicular Entry
4D Case 3: CD Shift Initiated by MD Slippage
4D Case 4: Excessive Spreading Geometry
CD Errors in Rolls
4E Case 1: Web Shifts Upstream of Winding Roll
4E Case 2: Web Position or Angle Errors
4E Case 3: Core Position or Angle Errors
4E Case 4: Cinching-Induced Telescoping
4E Case 5: Air Lubrication Telescoping
4E Case 6: Shaft and Core Deflection Telescoping
4E Case 7: Width Change or Recovery
4E Case 8: Pressure Sensitive Adhesive (PSA) Telescoping
4E Case 9: CD Shifts in Roll Handling
4E Case 10: CD Shifts During Roll Unwinding
4A – Web Starts with CD Error
TJWalker + Associates
Case 1:
Incoming CD Offset
Case 2:
Incoming Web Shifting or Oscillating
Case 3:
Automatic Guiding Errors
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