ISO 9184-7:1994 PDF

Paper, board and pulps — Fibre furnish analysis — Part 7: Determination of weight factor

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Title (English):

ISO 9184-7:1994

Paper, board and pulps — Fibre furnish analysis — Part 7: Determination of weight factor

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 4
Publication date:: July 21, 1994
Edition:: ISO IS 9184 edition 1 version 1
ICS:: 85.040

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Description (English):

Specifies two methods for determining the weight factor of fibres used in the fibre furnish analysis of paper, board and pulp: by comparison with a reference pulp (any pulp that contains only one type of well-defined fibre - mechanical pulps and beaten pulps are unsuitable, and whose weight factor is known) or by calculating from the fibre coarseness. The methods are applicable to all kinds of fibres of pulp from unmixed wood species which do not contain more than 5% of other fibres with an essentially different weight factor.

Technical details

Technical committee: ISO/TC 6 - Paper, board and pulps
SKU: ISO 9184-7:1994

Abstract

Overview

ISO 9184-7:1994 (Paper, board and pulps - Fibre furnish analysis - Part 7) specifies two standard methods to determine the fibre weight factor used in furnish analysis. The weight factor is a dimensionless ratio of the mass per unit length of a given fibre to that of a reference fibre (the reference mass per unit length is 0.180 mg/m). The part applies to pulps from unmixed wood species that contain no more than 5% of fibres with a substantially different weight factor.

Key Topics

Two accepted methods
- Comparison method: mix the unknown pulp with a known reference pulp in defined mass ratios and count fibres microscopically to calculate the sample weight factor.
- Fibre coarseness method: calculate the weight factor directly from measured fibre coarseness using the standard equation f = 5.55 · e_r (where e_r is fibre coarseness in mg/m).
Procedure highlights
- Prepare mixtures with about 20%, 40%, 60% and 80% by mass of the sample (balance is reference pulp).
- Prepare two slides per mixture and count fibres crossing the eyepiece centre mark; typically ~300 fibres per slide (≈600 fibres per mixture).
- Use a stain that differentiates reference pulp and sample (see ISO 9184-2 guidance).
- Report weight factor as a dimensionless value to two decimal places.
Quality checks and precision
- Condition samples before weighing and allow slides to dry as indicated in ISO 9184-1.
- If the four mixture results vary widely (minimum

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics

Two accepted methods
- Comparison method: mix the unknown pulp with a known reference pulp in defined mass ratios and count fibres microscopically to calculate the sample weight factor.
- Fibre coarseness method: calculate the weight factor directly from measured fibre coarseness using the standard equation f = 5.55 · e_r (where e_r is fibre coarseness in mg/m).
Procedure highlights
- Prepare mixtures with about 20%, 40%, 60% and 80% by mass of the sample (balance is reference pulp).
- Prepare two slides per mixture and count fibres crossing the eyepiece centre mark; typically ~300 fibres per slide (≈600 fibres per mixture).
- Use a stain that differentiates reference pulp and sample (see ISO 9184-2 guidance).
- Report weight factor as a dimensionless value to two decimal places.
Quality checks and precision
- Condition samples before weighing and allow slides to dry as indicated in ISO 9184-1.
- If the four mixture results vary widely (minimum

ISO 9184-7:1994 PDF

Technical details

Abstract

Overview

Key Topics

Related standards

Abstract

Overview

Key Topics

Related standards

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