ISO 7211-4-1984 PDF

Full title and description

ISO 7211-4:1984 — Textiles — Woven fabrics — Construction — Methods of analysis — Part 4: Determination of twist in yarn removed from fabric. Specifies a simple laboratory method for measuring the twist in yarns taken from woven fabrics by removing a length of yarn, holding it under tension between two clamps at a known separation and rotating one clamp until all twist is removed.

Abstract

Defines a procedure for determining the number of turns (twist) in yarns removed from woven fabrics. The method applies to yarns spun on conventional systems and is not intended for open-end (OE) or interlaced yarns. A length of yarn is extracted, clamped under tension at a known separation and one clamp is rotated until the yarn is free of twist; the angle/number of rotations gives the twist value.

General information

• Status: Published (International Standard, confirmed in subsequent ISO reviews).
• Publication date: March 1984 (Edition 1, 1984-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.30 (Textile fabrics).
• Edition / version: Edition 1 (1984).
• Number of pages: 2.

Key bibliographic and status details above are taken from the ISO bibliographic record for ISO 7211-4:1984.

Scope

Specifies a laboratory method for measuring twist in yarns removed from woven fabrics. The procedure is intended for yarns produced on conventional spinning systems and excludes open-end (OE) spun and certain interlaced yarn constructions. The scope covers the sample preparation (removal of yarn from fabric), clamping under a specified tension, the measurement distance between clamps and the rotation required to remove twist. The method is short, pragmatic and intended for routine construction analysis of woven fabrics.

Key topics and requirements

• Purpose: determine twist (turns per unit length or total turns removed) of yarn taken from fabric.
• Applicability limits: only conventional spun yarns; not applicable to OE/open-end or interlaced yarn types.
• Procedure essentials: remove yarn under controlled tension, fix between two clamps at a known separation, rotate one clamp until twist is fully removed, record rotations/angle and compute twist value.
• Requires simple laboratory equipment (clamps, tension arrangement, protractor or rotation-counting method) and minimal sample handling.
• Designed for use in fabric-construction analysis alongside other ISO 7211 series methods (e.g., thread count, crimp, linear density methods in other parts of the series).

Typical use and users

Used by textile laboratories, quality-control technicians, fabric technologists, R&D departments and standards bodies to characterise woven-fabric construction. Typical applications include comparative fabric analysis, investigation of fabric structural properties, troubleshooting production issues and supporting specification or test reports for woven fabrics. The method is appropriate where a simple, repeatable twist measurement from yarn removed from fabric is required.

Related standards

ISO 7211 is a multipart series addressing methods for analysis of woven fabric construction. Relevant parts include ISO 7211-1 (weave diagram and presentation), ISO 7211-2 (determination of number of threads per unit length — revised by ISO 7211-2:2024), ISO 7211-3 (determination of crimp of yarn in fabric) and ISO 7211-5 (determination of linear density of yarn removed from fabric — later updated as ISO 7211-5:2020). These parts are complementary when performing a full construction analysis of woven fabrics.

Keywords

textiles; woven fabrics; yarn twist; twist determination; fabric construction analysis; ISO 7211; textile testing; ISO/TC 38/SC 24.

FAQ

Q: What is this standard?

A: ISO 7211-4:1984 is an International Standard that specifies a laboratory method for determining the twist in yarns removed from woven fabrics.

Q: What does it cover?

A: It covers the sampling and measurement procedure whereby a length of yarn is removed from a fabric, clamped under tension at a known separation and one clamp is rotated until the twist is removed; the rotations (or angle) are used to calculate the twist in the yarn. The procedure excludes OE/open-end and certain interlaced yarns.

Q: Who typically uses it?

A: Textile test laboratories, quality-control and R&D teams in the textile and apparel industries, fabric technologists and standards organisations performing woven-fabric construction analysis.

Q: Is it current or superseded?

A: ISO 7211-4:1984 is published and has been subject to ISO systematic reviews; the ISO bibliographic record shows the standard as confirmed in ISO review cycles (most recently reflected in ISO records). For the latest status of any ISO part always check the ISO bibliographic record or national standards body.

Q: Is it part of a series?

A: Yes — it forms part of the ISO 7211 series (Methods of analysis for woven fabrics construction). Other parts (for example parts 1, 2, 3 and 5) cover weave presentation, thread count, crimp and linear density respectively; some parts have been revised at later dates.

Q: What are the key keywords?

A: textiles; woven fabrics; yarn twist; twist measurement; fabric construction; ISO 7211; textile testing.