ISO 2648-2020 PDF

Full title and description

ISO 2648:2020 — Wool — Determination of fibre length distribution parameters — Capacitance method. This international standard specifies a capacitive (electronic) method for measuring fibre length distribution parameters (principally mean length — expressed as Hauteur or Barbe — and the coefficient of variation) on slivers and rovings made from combed wool or combed combed synthetic fibres.

Abstract

The document describes the capacitance-based procedure, required sample preparation and conditioning, measurement procedure, calculation and expression of results, and reporting requirements for the determination of fibre length distribution parameters in combed wool and combed synthetic fibres. The method is not directly applicable to slivers containing blends of wool and synthetic fibres because of differences in dielectric properties.

General information

• Status: Published (International Standard, confirmed).
• Publication date: January 2020.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.060.10 (Natural fibres).
• Edition / version: Edition 2 (2020).
• Number of pages: 21.

Key bibliographic and life‑cycle details (status, edition, pages, ICS) are taken from the ISO bibliographic entry for ISO 2648:2020.

Scope

Specifies a capacitance (electronic) method to determine fibre length distribution parameters on slivers and rovings produced from combed wool or combed synthetic fibres. The standard defines apparatus requirements, calibration checks, test specimen preparation, measurement procedure, data reduction and the presentation of results. It excludes direct application to slivers composed of blends of wool and synthetic fibres because differing dielectric constants affect the measurement.

Key topics and requirements

• Principle of the capacitance measurement for fibre length distribution (electronic detection of fibre ends and length distribution calculation).
• Defined sample types: slivers and rovings from combed wool and combed synthetic fibres.
• Measured parameters: mean fibre length (Hauteur/Barbe) and coefficient of variation (and related summary statistics).
• Apparatus specifications, calibration and verification procedures to ensure measurement accuracy and repeatability.
• Sample conditioning, handling and test environment requirements to minimise variability.
• Limitations: not directly applicable to wool/synthetic blends due to different dielectric properties.

Typical use and users

Used by textile testing laboratories, wool classers, fibre processors, research and development organisations, and quality-control personnel in textile and wool-processing industries to characterise fibre length distributions for process control, product specification and research. The standard helps ensure comparability of fibre-length data between laboratories and over time.

Related standards

ISO 2648:2020 replaces the earlier ISO 2648:1974 edition and is part of the suite of ISO/TC 38 standards covering natural fibres and textile testing methods. Laboratories using ISO 2648 often refer to other ISO/TC 38 standards for complementary tests (fibre fineness, strength and conditioning procedures).

Keywords

wool; fibre length distribution; Hauteur; Barbe; capacitance method; sliver; roving; textile testing; ISO/TC 38; quality control.

FAQ

Q: What is this standard?

A: ISO 2648:2020 is an international standard that specifies a capacitance (electronic) method for determining fibre length distribution parameters in combed wool and combed synthetic fibres.

Q: What does it cover?

A: It covers apparatus requirements, sample preparation and conditioning, measurement procedures, calculation of mean length and coefficient of variation, calibration checks and reporting of results for slivers and rovings. It excludes slivers made from wool/synthetic blends because of dielectric differences.

Q: Who typically uses it?

A: Textile and wool testing laboratories, fibre processors, quality managers, researchers and standards bodies involved in wool and fibre characterisation.

Q: Is it current or superseded?

A: ISO 2648:2020 is the current (second) edition, published January 2020; it replaced ISO 2648:1974 and is listed as a published/confirmed international standard in the ISO bibliographic record.

Q: Is it part of a series?

A: It is part of the body of ISO/TC 38 textile standards addressing natural fibres and textile testing methods (complementary standards cover other fibre properties such as fineness, strength and conditioning).

Q: What are the key keywords?

A: Wool, fibre length distribution, capacitance, Hauteur, Barbe, sliver, roving, textile testing, ISO.