BS ISO 5350-4:2006

1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
   6.1 General
   6.2 Pulp sheets
   6.3 Slush or flash-dried pulp
7 Procedure
   7.1 General
   7.2 Calibration
   7.3 Examination
8 Expression of results
9 Precision
   9.1 General
   9.2 Repeatability
   9.3 Reproducibility
10 Test report
Annex A (normative) Equivalent Black Area (EBA) calculations
Annex B (normative) Calibration-plate information
Bibliography

Defines a method using instrumental inspection by reflected light for the estimation of visible dirt and shives in pulp manufactured in sheets, in terms of Equivalent Black Area (EBA) of dirt specks within the physical area range of 0,02 mm[2] to 3,0 mm[2].

This part of ISO5350 specifies a method using instrumental inspection by reflected light for the estimation of visible dirt and shives in pulp manufactured in sheets, in terms of Equivalent Black Area (EBA) of dirt specks within the physical area range of 0,02mm² to 3,0mm². Using the algorithm prescribed in this part of ISO5350, the maximum dirt size is limited to 3,0mm². Extension to other speck sizes (for example, those greater than 3,0mm² in physical area) may require changes in equipment, calculation procedures, or both, and is not covered in this part of ISO5350. This part of ISO5350 cannot be used for physical area measurements, since it may not correctly measure the dirt specks for that mode of measurement.

The specimen to be evaluated should have a brightness, as determined by ISO3688, of 30%or greater. It may be necessary to reform some pulp sheets into laboratory sheets, if the surface is too rough or textured.

This part of ISO5350 is also intended for recycled pulp.