ISO 1136-2015 PDF

Full title and description

Wool — Determination of mean diameter of fibres — Air permeability method. This International Standard specifies a laboratory method that determines the mean fibre diameter of wool by measuring the air permeability of a weighed bundle of fibres under defined conditions; it is particularly suited to clean, unmedullated wool in combed sliver form.

Abstract

ISO 1136:2015 describes an air-permeability (permeametric) technique for estimating the mean diameter of wool fibres. The method requires specimens of clean, unmedullated fibres dispersed in a uniform open state (especially combed slivers), requires the dichloromethane-extractable matter content of the specimen to be ≤ 1.0 %, and is noted to be less accurate for lambswool or appreciably medullated or heavily dyed wool. The standard includes procedural requirements, apparatus description and guidance on applicability.

General information

• Status: Published.
• Publication date: 3 March 2015 (2015-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.060.10 (Natural fibres / Textiles).
• Edition / version: Edition 2 (2015).
• Number of pages: 15 pages.

Scope

This standard specifies a permeametric procedure for estimating mean fibre diameter of wool by passing a controlled air flow through a measured specimen held in a defined chamber and converting the measured air permeability to a mean diameter value. It is intended for clean, unmedullated wool fibres dispersed in an open state and is particularly suitable for combed slivers; the method requires low extractables (dichloromethane extractable matter ≤ 1.0 %) and is less accurate with lambswool, heavily medullated wool or heavily dyed material. Guidance and limitations are given in the annexes.

Key topics and requirements

• Principle: measurement of air permeability of a known mass/volume of wool fibres to infer mean fibre diameter.
• Apparatus: permeameter/test chamber and flow/pressure measurement instruments suitable for the specified specimen geometry and range.
• Specimen preparation: clean, unmedullated fibres dispersed in an open state (combed slivers recommended); limits on extractable matter (≤ 1.0 % dichloromethane).
• Calibration and conversion: use of calibration data/tables or graphs to convert permeability readings to mean diameter values; procedures for repeatability and accuracy checks.
• Limitations: known reduced accuracy for lambswool, appreciably medullated fibres and heavily dyed wools; applicability notes in annexes.

Typical use and users

Used by textile testing laboratories, wool processors and traders, quality-control departments in textile manufacturing, research laboratories studying natural fibres, and standards bodies. Typical applications include routine quality assessment of combed slivers, comparative fibre-sizing in production control, and research where a quick laboratory estimate of mean wool-fibre diameter is required.

Related standards

ISO 1136:2015 replaces ISO 1136:1976 (withdrawn). It was developed under ISO/TC 38 (Textiles), subcommittee SC 23 (Natural fibres). Other standards on wool and fibre testing (published by ISO and national bodies) cover complementary test methods and definitions for fibre measurement; users should consult their national standards organization for cross-references and translations.

Keywords

wool, fibre diameter, mean diameter, air permeability, permeametric method, combed sliver, textile testing, natural fibres, ISO 1136, fibre sizing.

FAQ

Q: What is this standard?

A: ISO 1136:2015 is an International Standard that specifies a laboratory method to estimate the mean diameter of wool fibres by measuring air permeability of a prepared wool specimen.

Q: What does it cover?

A: It covers the principle, apparatus, specimen preparation, test procedure, calibration/conversion of permeability readings to mean diameter, and limitations of the air-permeability method when applied to various wool types (including notes on accuracy and applicability).

Q: Who typically uses it?

A: Textile testing and quality-control laboratories, wool processors and merchants, researchers working with wool fibres, and standards organizations that need a standardized, repeatable method for estimating mean fibre diameter.

Q: Is it current or superseded?

A: ISO 1136:2015 is the current published edition that superseded ISO 1136:1976; the 2015 edition is the active version published in March 2015. Users should check with ISO or their national standards body for the latest confirmation or any amendments.

Q: Is it part of a series?

A: It forms part of the body of ISO standards and test methods relating to wool and natural-fibre measurement developed by ISO/TC 38 (Textiles), SC 23 (Natural fibres); it complements other ISO textile test methods rather than being a numbered sequential series.

Q: What are the key keywords?

A: wool, mean fibre diameter, air permeability, permeametric, combed sliver, textile testing, natural fibres.