BS EN ISO 5350-2:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling and preparation of test pieces
  6.1 Sampling
  6.2 Selection of test pieces for inspection
7 Procedure
  7.1 Determination of dry matter content
  7.2 Wetting of the test pieces
  7.3 Examination
  7.4 Classification of contraries
8 Expression of results
  8.1 Calculation
  8.2 Results
  8.3 Precision
9 Test report
Annex A (normative) Comparison chart
Annex B (informative) Instrumental procedure
Bibliography

Describes a method for the estimation by transmitted light of the visible dirt and shives in pulp manufactured in sheets.

This part of ISO5350 specifies a method for the estimation by transmitted light of the visible dirt and shives in pulp manufactured in sheets.

It does not apply to unbleached kraft pulps or to any other sheeted pulps that are too opaque to allow for the estimation of the minimum size or for minimum contrast specks to be counted, in accordance with this part of ISO5350. The maximum grammage for most pulp sheets is in the range 800g/m² to 1000g/m².

If the sheets of the mill sheeted pulp have high grammage or are very opaque for other reasons, ISO5350-1 should be applied.

NOTE For thick sheets, with highly textured surfaces and/or with density variations, wetting the sheet will cause optical variations, called lens distortions, that will distort the perceived size of a dirt speck, thus reducing the precision of the size estimation. Alternatively, use ISO5350-1 to disintegrate the sheet and to prepare laboratory sheets for the size estimation.

This part of ISO5350 is not intended for recycled pulp.