ISO 7211-3-1984 PDF

Full title and description

Textiles — Woven fabrics — Construction — Methods of analysis — Part 3: Determination of crimp of yarn in fabric. The standard specifies a laboratory method for removing yarn from a fabric strip, straightening it under specified tension and measuring the difference between its straightened length and the in‑fabric distance, expressed as a percentage (crimp).

Abstract

Threads are removed from a strip of fabric of known length, straightened by a tension varied according to the nature and linear density of the yarn, and measured in the straightened state. The crimp is reported as the percentage difference between the straightened length and the distance between the yarn ends while in the fabric. This concise test method is intended for routine analysis of woven‑fabric construction.

General information

• Status: Published (International Standard; confirmed in periodic reviews).
• Publication date: March 1984 (Edition 1, 1984-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.30 — Textile fabrics / woven fabrics (fabric construction methods).
• Edition / version: Edition 1 (1984).
• Number of pages: 3 pages in the ISO publication (note: some national/adopted versions include additional national foreword/annex pages and may be listed with a larger page count).

Scope

This part of ISO 7211 specifies a method for determining the crimp (waviness) of individual warp or weft yarns in woven fabrics by removing a yarn sample from the fabric, applying a controlled tension to straighten the yarn and measuring lengths to compute crimp as a percentage. The procedure includes guidance on sample selection, the tension to be applied (relative to yarn linear density), measurement procedure and calculation/reporting of results. It applies to conventional spun and filament yarns where the method is appropriate.

Key topics and requirements

• Sample cutting and identification (strip of fabric of known length).
• Removal of individual yarns (warp or weft) without altering their in‑fabric orientation.
• Straightening under a specified tension that is adjusted for yarn linear density and yarn type.
• Measurement of straightened yarn length and the corresponding in‑fabric distance between yarn ends.
• Calculation of crimp: percentage difference between straightened length and in‑fabric distance.
• Reporting of results, including test conditions (tension used, yarn type, number of samples) to ensure reproducibility.

Typical use and users

Used by textile test laboratories, fabric technologists, textile manufacturers and quality control teams to quantify yarn crimp (an important parameter affecting fabric appearance, dimensional stability and mechanical behaviour). Also used in research, product development and standards conformity assessments for woven fabrics. National standards bodies and suppliers of test methods refer to this standard when specifying fabric construction analysis.

Related standards

ISO 7211 is a multipart series covering methods of analysis for woven‑fabric construction. Related parts include ISO 7211‑1 (presentation of weave diagrams and drafting/denting/lifting plans), ISO 7211‑2 (determination of number of threads per unit length; note this part has later revisions), and ISO 7211‑4 (determination of twist in yarn removed from fabric). Users often apply these parts together when performing comprehensive fabric construction analysis.

Keywords

crimp; yarn crimp; woven fabrics; fabric construction; methods of analysis; yarn removal; textile testing; ISO 7211; fabric measurement.

FAQ

Q: What is this standard?

A: ISO 7211‑3:1984 is an international standard that specifies a laboratory method for determining the crimp of yarns in woven fabrics by measuring the change in length when yarns are straightened under a defined tension.

Q: What does it cover?

A: It covers sample preparation, removal and straightening of yarns, the tensioning procedure (adjusted by yarn linear density), measurement of lengths and the calculation and reporting of crimp as a percentage.

Q: Who typically uses it?

A: Textile laboratories, fabric manufacturers, quality control engineers, researchers and standards bodies concerned with woven‑fabric construction and dimensional/appearance properties.

Q: Is it current or superseded?

A: ISO 7211‑3:1984 is a published International Standard from 1984. ISO records show this edition has been subject to periodic review (the ISO bibliographic entry indicates the published 1984 edition and review confirmations). Users should check national adoption notices for any later national revisions or replacements of related parts.

Q: Is it part of a series?

A: Yes — ISO 7211 is a multipart series on woven‑fabric construction methods of analysis (for example, ISO 7211‑1, ISO 7211‑2 and ISO 7211‑4 are other parts addressing weave diagrams, thread counts and yarn twist). These parts are intended to be complementary when analysing woven fabric construction.

Q: What are the key keywords?

A: crimp, yarn, woven fabrics, fabric construction, methods of analysis, textile testing, ISO 7211.