ISO 7211-3:1984 PDF

Name: ISO 7211-3:1984 — Textiles — Woven fabrics — Construction — Methods of analysis — Part 3: Determination of crimp of yarn in fabric
SKU: ISO 7211-3:1984
Price: 25 EUR
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Textiles — Woven fabrics — Construction — Methods of analysis — Part 3: Determination of crimp of yarn in fabric

Название (английский):

ISO 7211-3:1984

Textiles — Woven fabrics — Construction — Methods of analysis — Part 3: Determination of crimp of yarn in fabric

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 1 марта 1984 г.
Издание:: ISO IS 7211 edition 1 version 1
ICS:: 59.080.30

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Описание (английский):

Threads are removed from a strip of fabric of known length, straightened by a tension which is varied according to the nature and linear density of the yarn, and measured in the straightened state. The difference between the straightened length of the thread and the distance between the ends while in fabric is expressed as a percentage of the latter.

Abstract

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Overview

ISO 7211-3:1984 specifies a standardized laboratory method for determining the crimp (embuvage) of yarn in woven fabrics. The method measures the difference between the yarn length when straightened under a specified tension and the distance the yarn occupies in the fabric, expressing that difference as a percentage of the in‑fabric length. This procedure is applicable to most woven fabrics and is essential for consistent yarn crimp determination, fabric construction analysis and quality control.

Key topics and requirements

Principle: Remove threads from a conditioned fabric strip, straighten each yarn by applying a rectifying tension (varied by yarn type and linear density), measure the yarn length under tension (L) and the in‑fabric length (L0). Calculate crimp C = (L − L0) / L0 × 100.

Apparatus:

Tensioning device with two clamps (parallel clamping surfaces, adjustable spacing, marks ~2.5 mm from clamp edge).
Means to apply and vary rectification tension.
Ruler graduated in the same units and an unpicking needle.

Specimen preparation:

Condition samples in a normal textile atmosphere (per ISO 139) for at least 16 hours.
Cut five rectangular strips (two with long side parallel to warp, three parallel to weft) and extract groups of 10 yarns from the middle of each strip.
Each strip should contain at least 10 yarns across and a length representing at least 20 times the length held in the clamps.

Measurement procedure:

Place yarn ends in clamps, apply specified rectification tension, measure L (length under tension) and L0 (distance between clamp markers equal to strip width).
Repeat measurements to obtain averages for groups of 10 yarns.

Rectification tension guidance:

An annex provides tension formulas expressed as a function of yarn linear density (tex) for common yarn types (cotton, wool, continuous synthetic filaments). Tensions are given in cN (table footnote as printed: “1 cN = 1 gf”).

Reporting: Test report must include standard reference (ISO 7211/3), conditioning atmosphere, specimen dimensions, applied rectification tension, measured lengths, crimp (%) for each group and any deviations from the method.

Applications and users

Textile testing laboratories and quality control departments

Fabric manufacturers and textile technologists analyzing weave geometry

R&D and academic researchers studying yarn/fabric behavior, dimensional stability and appearance

Procurement and compliance teams specifying construction parameters for woven fabrics

ISO 7211-3:1984 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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