Paper Parameters

List of Useful Parameters and their Units in Paper, Printing & Packaging Industry 

PARAMETER RECOMMENDED UNIT

OR

METHOD OF EXPRESSION

PARAMETER RECOMMENDED UNIT

OR

METHOD OF EXPRESSION

MECHANICAL PROPERTIES      
    Light absorption coefficient m²/kg
Apparentbulk density g/cm³ Light absorbing power numerical value
Apparentsheet density g/cm³ Light scattering power numerical value
Bending stiffness µm, mNm, Nm Light scattering coefficient m²/kg
Bending stiffness index Nm²/kg² Opacity %
Box compression resistance BCT kN Reflectance factor %
Breaking length km Reflection (optical) density numerical value
Bulking thickness µm Transmission (optical) density numerical value
       
Burst energy absorption s/m² SURFACE PROPERTIES  
Burst index kPam²/g    
Bursting strength kPa Adhesion on strength of glue  
Compression resistance SCT kN/m bonds of corrugated fibreboard kn/m
Compression resistance SCT Index kNm/kg Air permeance µm/(Pa.s)
Edgewise crush resistance kN/m Air resistance (Gurley) s
Flat compression resistance kPa Friction coefficient N/N
Flat compression resistance FCT   Ink absorbency “K and N” “K and N” units
(corrugated board) kPa Picking velocity, IGT m/s
Flat crush resistance of laboratory   Resistance to water penetration min, h, d
fluted corrugated medium N Resistance to grease penetration min, h, d
Fracture toughness J/m Roughness, Print-surf µm
Fracture toughness index Jm/kg Roughness, Sheffield m 1/min
Fold number, double folds numeriacl value Roughness, Bendtsen m 1/min
Folding endurance log10( number of Smoothness, Bekk s
  folds) Water absorbency  
Grammage g/m² *area basis g/m²
Puncture resistance J, kj    
Ring crush kN/m    
Static bending force mN, N OTHERS  
Stretch at break % Ash %(mass/mass)
Tear index mNm²/g Conductivity of extracts mS/m
Tearing strength N Dimensional change after  
Tensile index Nm/g immersion in water %
Tensile energy absorption J/m² Dint and shives in pulps 10² (number of
Tensile stiffness N/m   spocks)/kg
Tensile stiffness index Nm/kg Drainability of pulp “CSF”  
Tensile stiffness orientation *(degree with and Schopper-Riegler numerical value
  decimalsub- Electric strength kV/mm
  divisions) Hygroexpansivity %
Tensile strength kN/m Moisture content or dry matter  
Tensile toughness Index Jm/kg content %(mass/mass)
Tensile toughness J/m Stock concentration %
Thickness µm, mm Swelling after water immersion %
z-direction strength properties kN/m² Surface resistivity Ώ
    Volume resistivity Ώ .m
    Water absorbency  
OPTICAL PROPERTIES   *mass basis %
Gloss % or numerical *capillary rise mm
  value Water vapour transmission rate g(m², d)