IMPORTANT PARAMETERS FOR PAPER & PAPERBOARD
IMPORTANT PARAMETERS FOR PAPER & PAPERBOARD

IMPORTANT PARAMETERS FOR PAPER & PAPERBOARD

  • Grammage - weight per unit area expressed in g/m2.
  • Thickness (caliper) - the perpendicular distance  between the two surfaces of the board/paper, expressed in mm, measured with a micrometer.
  • Compressibility - the reduction in thickness under compressive forces or pressure. It influences the ability of paper to change its surface contour and to conform to and make contact with the printng plate or blanket during printing impression.
  • Resiliency - the ability of paper to recover its original thickness and surface contour after release of the compressive forces of printing nips.
  • Water Absorption (COBB) - the surface water absorpton over 60 seconds, expressed in g/m2, measured by Cobb Test.
  • Water Absorption (WICK) - water absorption at the edges, expressed in kg/m2, using Wick Test.
  • Wettability - printing ink/glue adherence to the board surface is influence by wettability, measured as the surface tension of the liquid, expressed in dynes/cm.
  • Moisture Content - the absolute moisture content, expressed as a % of the paperboard weight.
  • Stiffness (Taber) - a measure of flexural rigidity.
  • Bending Resistance (L&W) - a measure of the resistance offered to a bending force by a rectangular sample, expressed in mN (milliNewtons).