ISO 5350-2:2006 PDF

Pulps — Estimation of dirt and shives — Part 2: Inspection of mill sheeted pulp by transmitted light

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Title (English):

ISO 5350-2:2006

Pulps — Estimation of dirt and shives — Part 2: Inspection of mill sheeted pulp by transmitted light

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: August 9, 2006
Edition:: ISO IS 5350 edition 3 version 1
ICS:: 85.040

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Description (English):

ISO 5350-2:2006 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 ISO 5350-2:2006. The maximum grammage for most pulp sheets is in the range 800 g/m2 to 1 000 g/m2. If the sheets of the mill sheeted pulp have high grammage or are very opaque for other reasons, ISO 5350-1:2006 should be applied. ISO 5350-2:2006 is not intended for recycled pulp.

Technical details

Technical committee: ISO/TC 6 - Paper, board and pulps
SKU: ISO 5350-2:2006

Abstract

Overview

ISO 5350-2:2006 - "Pulps - Estimation of dirt and shives - Part 2: Inspection of mill sheeted pulp by transmitted light" defines a visual method to estimate visible dirt and shives in mill-sheeted pulp using transmitted light. The method reports the total area of contraries as square millimetres per kilogram (mm²/kg) of oven-dry pulp. It applies to most sheeted pulps (typical maximum grammage 800–1 000 g/m²) but excludes unbleached kraft pulps, recycled pulp, and any sheets too opaque to permit reliable transmitted-light estimation.

Key topics and technical requirements

Principle: Inspect wet or sufficiently transparent test pieces in transmitted light using a viewing table and a normative comparison chart (Annex A) to size and classify contraries.
Sampling & sample size: Select representative test pieces per ISO 7213; inspect at least 300 g oven-dry pulp (total area ≥ 0.5 m²). If preliminary counts exceed 300 contraries/kg, inspection mass may be reduced to 100 g (must be reported).
Minimum detectable size: Only contraries ≥ 0.04 mm² are counted.
Size classes:
- Class 1: > 5 mm²
- Class 2: 1.00–4.99 mm² (log mean 2.482 mm²)
- Class 3: 0.40–0.99 mm² (log mean 0.651 mm²)
- Class 4: 0.15–0.39 mm² (log mean 0.251 mm²)
- Class 5: 0.04–0.14 mm² (log mean 0.080 mm²) - optional
Apparatus & lighting: Viewing-table luminance 2 500–3 000 cd/m²; avoid daylight and direct external light. Do not use photocopies of the comparison chart.
Calculation: Total area X (mm²/kg) = Σ (c_i × n_i) / m, where c_i is the class logarithmic mean area, n_i is the count in class i, and m is oven-dry mass (kg). For contraries > 5 mm² use true measured area.
Reporting: Report mm²/kg (nearest integer; values

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Principle: Inspect wet or sufficiently transparent test pieces in transmitted light using a viewing table and a normative comparison chart (Annex A) to size and classify contraries.
Sampling & sample size: Select representative test pieces per ISO 7213; inspect at least 300 g oven-dry pulp (total area ≥ 0.5 m²). If preliminary counts exceed 300 contraries/kg, inspection mass may be reduced to 100 g (must be reported).
Minimum detectable size: Only contraries ≥ 0.04 mm² are counted.
Size classes:
- Class 1: > 5 mm²
- Class 2: 1.00–4.99 mm² (log mean 2.482 mm²)
- Class 3: 0.40–0.99 mm² (log mean 0.651 mm²)
- Class 4: 0.15–0.39 mm² (log mean 0.251 mm²)
- Class 5: 0.04–0.14 mm² (log mean 0.080 mm²) - optional
Apparatus & lighting: Viewing-table luminance 2 500–3 000 cd/m²; avoid daylight and direct external light. Do not use photocopies of the comparison chart.
Calculation: Total area X (mm²/kg) = Σ (c_i × n_i) / m, where c_i is the class logarithmic mean area, n_i is the count in class i, and m is oven-dry mass (kg). For contraries > 5 mm² use true measured area.
Reporting: Report mm²/kg (nearest integer; values

ISO 5350-2:2006 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Pulps - Sampling for testing (ISO 7213:2021)

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