Paper Parameter

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

PARAMETERRECOMMENDED UNIT

 

OR

METHOD OF EXPRESSION

PARAMETERRECOMMENDED UNIT

 

OR

METHOD OF EXPRESSION

MECHANICAL PROPERTIES   
  Light absorption coefficientm²/kg
Apparentbulk densityg/cm³Light absorbing powernumerical value
Apparentsheet densityg/cm³Light scattering powernumerical value
Bending stiffnessµm, mNm, NmLight scattering coefficientm²/kg
Bending stiffness indexNm²/kg²Opacity%
Box compression resistance BCTkNReflectance factor%
Breaking lengthkmReflection (optical) densitynumerical value
Bulking thicknessµmTransmission (optical) densitynumerical value
    
Burst energy absorptions/m²SURFACE PROPERTIES 
Burst indexkPam²/g  
Bursting strengthkPaAdhesion on strength of glue 
Compression resistance SCTkN/mbonds of corrugated fibreboardkn/m
Compression resistance SCT IndexkNm/kgAir permeanceµm/(Pa.s)
Edgewise crush resistancekN/mAir resistance (Gurley)s
Flat compression resistancekPaFrictioncoefficient N/N
Flat compression resistance FCT Ink absorbency “K and N”“K and N” units
(corrugated board)kPaPicking velocity, IGTm/s
Flat crush resistance of laboratory Resistance to water penetrationmin, h, d
fluted corrugated mediumNResistance to grease penetrationmin, h, d
Fracture toughnessJ/mRoughness, Print-surfµm
Fracture toughness indexJm/kgRoughness, Sheffieldm 1/min
Fold number, double foldsnumeriacl valueRoughness, Bendtsenm 1/min
Folding endurancelog10( number ofSmoothness, Bekks
 folds)Water absorbency 
Grammageg/m²*area basisg/m²
Puncture resistanceJ, kj  
Ring crushkN/m  
Static bending forcemN, NOTHERS 
Stretch at break%Ash%(mass/mass)
Tear indexmNm²/gConductivity of extractsmS/m
Tearing strengthNDimensional change after 
Tensile indexNm/gimmersion in water%
Tensile energy absorptionJ/m²Dint and shives in pulps10² (number of
Tensile stiffnessN/m spocks)/kg
Tensile stiffness indexNm/kgDrainability of pulp “CSF” 
Tensile stiffness orientation*(degree withand Schopper-Rieglernumerical value
 decimalsub-Electric strengthkV/mm
 divisions)Hygroexpansivity%
Tensile strengthkN/mMoisture content or dry matter 
Tensile toughness IndexJm/kgcontent%(mass/mass)
Tensile toughnessJ/mStock concentration%
Thicknessµm, mmSwelling after water immersion%
z-direction strength propertieskN/m²Surface resistivityΏ
  Volume resistivityΏ .m
  Water absorbency 
OPTICAL PROPERTIES *mass basis%
Gloss% or numerical*capillary risemm
 valueWater vapour transmission rateg(m², d)