ISO 2648:2020 PDF

Name: ISO 2648:2020 — Wool — Determination of fibre length distribution parameters — Capacitance method
SKU: ISO 2648:2020
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Wool — Determination of fibre length distribution parameters — Capacitance method

Название (английский):

ISO 2648:2020

Wool — Determination of fibre length distribution parameters — Capacitance method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 21
Дата публикации:: 27 января 2020 г.
Издание:: ISO IS 2648 edition 2 version 1
ICS:: 59.060.10

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Описание (английский):

This document specifies a method for the determination of fibre length distribution parameters (principally mean length, expressed as Hauteur or Barbe, and the coefficient of variation of the measurement) on slivers and rovings made from combed wool or combed synthetic fibres. As the fibres of different chemical structure have different di-electric values, the method is not directly applicable to slivers made up of a blend of wool/synthetic fibres.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 2648:2020 - "Wool - Determination of fibre length distribution parameters - Capacitance method" specifies a standard test method for measuring fibre length distribution in slivers and rovings produced from combed wool or combed synthetic fibres. The method uses a capacitive sensor to derive length-distribution parameters such as Hauteur (H) and Barbe (B) and their coefficients of variation (CV). The standard notes that it is not directly applicable to wool/synthetic blends because differing dielectric properties affect the capacitive measurement.

Key topics and technical requirements

Scope & limitations

Applies to slivers and rovings from combed wool or combed synthetic fibres.
Not suitable for mixed wool/synthetic slivers due to different dielectric values.

Measured parameters

Hauteur (H) - mean cross-section biased length (certifiable).
Barbe (B) - mean weight-biased length.
Coefficient of variation (CV) for H and B.
Additional outputs: L values, K values, percentage of short fibres, and tuft diagrams.

Principle

A mechanical grip extracts a numerical draw; a test specimen (~30 000 aligned fibres) is formed and passed through a measuring condenser.
Change in capacitance as fibres replace air between condenser plates produces a cumulative Hauteur diagram.

Apparatus

Mechanical grip (automatic or manual preparer).
Main capacitive sensor-based instrument with a measuring condenser (specified elongated geometry) and data capture (analogue recorder or digital system).
Test specimen holder, extractor, and restraining strip.

Sampling and conditioning

Laboratory samples (e.g., sliver ~1.20 m) and detailed specimen-preparation procedures are specified.
Standard conditioning/testing atmosphere per ISO 139; typical preliminary conditioning period is 24 hours.

Procedure & reporting

Clauses cover specimen preparation, measurement cycles (left/right ends), calculation methods for analogue and digital systems, and required test report elements.

Precision

The standard includes precision data, within- and between-laboratory variation, and confidence intervals.

Practical applications and users

Who uses ISO 2648:2020:

Textile testing laboratories performing wool fibre quality analysis

Wool processors and combing mills for process control and acceptance testing

Quality assurance and specification teams in yarn and textile manufacturing

Instrument manufacturers and service providers for capacitive fibre-length analysers

R&D groups developing fibre blending, carding and spinning processes

Practical benefits:

Objective, repeatable measurement of fibre-length distribution for production control

Data to inform spinning performance, yarn evenness and end-product quality

Standardized reporting to support supplier specifications and quality agreements

ISO 2648:2020 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

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