PROBLEM
Sheet Curl
CAUSE
  • Stock absorbs too much water.
  • Excessive heat.
  • Mechanical distortion.
  • Incorrect coating.
SOLUTION
  • Precondition Stock.
  • Check moisture content of paper.
  • Stock moisture content should be at 5-6%. Too low moisture content (<5%) leads to excessive distortion as water is absorbed from the coating.
  • Use paper stocks of 80 lb. or higher.
  • Lessen the coating weight via metering or lowering the viscosity.
    Reduce heat.
  • Run the coating to edge of the sheet if possible.
  • Use inks with a lower water pickup. Check the sheet guides, most notably star wheels can distort the sheet.
  • Engage sheet decurler if available.
  • Contact your C&A representative
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