ISO 7211-5-2020 PDF
Name in English:
St ISO 7211-5-2020
Name in Russian:
Ст ISO 7211-5-2020
Original standard ISO 7211-5-2020 in PDF full version. Additional info + preview on request
Full title and description
St ISO 7211-5-2020 — Textiles — Methods for analysis of woven fabrics construction — Part 5: Determination of linear density of yarn removed from fabric. This document specifies procedures for removing yarn from woven fabrics, measuring its straightened length and mass, and calculating the linear density (mass per unit length) of yarns taken from a fabric.
Abstract
ISO 7211-5:2020 defines laboratory methods to determine the linear density of yarns removed from woven fabrics. It applies to yarns of nominally uniform linear density and covers the sampling (number of threads and method of removal), length measurement under defined conditions, two alternative mass-determination methods (equilibrium with standard test atmosphere or oven-dry plus a commercial allowance) and the calculation procedure to derive yarn linear density from measured mass and summed straightened lengths.
General information
- Status: Published / Current
- Publication date: August 2020 (Edition 2, 2020‑08)
- Publisher: International Organization for Standardization (ISO)
- ICS / categories: 59.080.30 (Textile fabrics)
- Edition / version: Edition 2 (2020)
- Number of pages: 5 (ISO published document)
Scope
This part of ISO 7211 specifies methods for determining the linear density (mass per unit length) of yarns removed from woven fabrics. It covers the procedure for extracting threads from fabric specimens, the required number of threads and specimen dimensions, measurement of straightened lengths under defined conditions, two accepted methods for determining yarn mass, and the formulae for calculating linear density. It is intended for yarns that are nominally uniform in linear density and is not a full specification for knitted or non‑woven materials.
Key topics and requirements
- Sampling and specimen preparation: selection of fabric strips and removal of warp/weft threads without altering yarn structure.
- Length measurement: measurement of straightened length(s) of removed yarn portions under defined tension/conditions.
- Mass determination methods:
- Method A — mass determined in equilibrium with the standard atmosphere for textile testing;
- Method B — oven‑dry mass determination plus application of an agreed commercial allowance (reference to commercial allowance values historically given in ISO 6741 series).
- Calculation: deriving linear density from the measured mass and the sum of straightened lengths; reporting conventions and rounding.
- Applicability: intended for yarns of nominally uniform linear density removed from woven fabrics (warp and weft).
- Normative references and committee: produced by ISO/TC 38/SC 24 (textile fabrics construction analysis).
Typical use and users
Used by textile testing laboratories, quality control departments in textile and apparel manufacturing, yarn and fibre producers, research institutions and standards organizations. Typical applications include verifying yarn specifications after weaving, characterizing fabric construction, supporting material declarations and R&D investigations where accurate yarn linear density extracted from fabric is required.
Related standards
Belongs to the ISO 7211 series (methods for analysis of woven fabric construction). Relevant related documents include other parts of ISO 7211 (older and newer parts covering crimp, thread counts, twist and mass per unit area), ISO 7211‑6:2020 (determination of the mass of warp and weft per unit area), earlier ISO 7211 editions (1984 series) and national/adopted equivalents such as BS ISO 7211‑5:2020, NF ISO 7211‑5:2020 and NEN‑ISO 7211‑5:2020. ISO 6741 (commercial mass/allowances and moisture regain guidance) is referenced for the commercial allowance approach.
Keywords
linear density, yarn linear density, yarn mass per unit length, yarn removed from fabric, woven fabrics, textile testing, ISO 7211, warp, weft, sample preparation
FAQ
Q: What is this standard?
A: ISO 7211-5:2020 is an ISO standard that defines laboratory methods to determine the linear density (mass per unit length) of yarns removed from woven fabrics.
Q: What does it cover?
A: It covers procedures for removing threads from fabric specimens, measuring straightened lengths, two accepted methods for determining yarn mass (standard atmosphere equilibrium or oven‑dry plus commercial allowance), and the calculation/reporting of linear density. It applies to yarns of nominally uniform linear density taken from woven fabrics.
Q: Who typically uses it?
A: Textile testing laboratories, QC teams in textile and apparel manufacturing, yarn/fibre producers, researchers and standards bodies use it to verify yarn properties and document fabric construction characteristics.
Q: Is it current or superseded?
A: The 2020 document is the current (Edition 2) version; it supersedes the earlier 1984 edition of ISO 7211‑5. ISO standards are subject to periodic review.
Q: Is it part of a series?
A: Yes. ISO 7211‑5 is one part of the ISO 7211 series (methods for analysis of woven fabrics construction). Other parts address related measurements such as crimp, thread count, twist and mass per unit area.
Q: What are the key keywords?
A: Linear density; yarn mass per unit length; yarn removed from fabric; woven fabrics; textile testing; warp; weft; ISO 7211.