ISO 2:1973

Textiles - Designation of the direction of twist in yarns and related products

Applicable to yarn intermediates such as slivers, slubbings or rovings; to single yarns, plied yarns, cabled yarns; and to threads, twine, cordage and rope. The direction of twist in yarns, slivers, slubbings and rovings is indicated by the capital letters S and Z. The directions of twist are described in two figures. Designation of complex yarns and related products is explained.

Textiles — Indication du sens de torsion des fils et produits associés

Tekstilije - Označevanje smeri vitja v preji in podobnih izdelkih

General Information

• Status: Published
• Publication Date: 31-Aug-1973
• ICS: 59.080.20 - Yarns
• Technical Committee: ISO/TC 38/SC 23 - Fibres and yarns
• Drafting Committee: ISO/TC 38/SC 23 - Fibres and yarns
• Current Stage: 9093 - International Standard confirmed
• Start Date: 29-Dec-2021
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 2:1995 - Textiles -- Designation of the direction of twist in yarns and related products

Relations

• Consolidated By: ISO 11064-2:2000 - Ergonomic design of control centres - Part 2: Principles for the arrangement of control suites
• Effective Date: 06-Jun-2022

Overview

ISO 2:1973 is an international standard established by the International Organization for Standardization (ISO) that defines the designation of the direction of twist in textile yarns and related products. This standard applies to various yarn intermediates such as slivers, slubbings, and rovings, as well as to single yarns, plied yarns, cabled yarns, threads, twine, cordage, and rope. The core purpose of ISO 2:1973 is to provide a clear and universally accepted method of indicating whether the twist in these products runs in the S or Z direction.

Key Topics

• Direction of Twist Designation
  The standard specifies using the capital letters S and Z to indicate the direction of yarn twist:

  • S twist: The twist spirals in the same direction as the central portion of the letter "S". When held vertically, the fibers or filaments slant in this same direction.
  • Z twist: The twist follows the inclination resembling the central portion of the letter "Z", with the spiral slanting accordingly when held vertically.

• Yarn Types Covered
  ISO 2:1973 applies to a wide range of yarn types, including:

  • Yarn intermediates such as slivers, slubbings, and rovings
  • Single yarns
  • Plied yarns and cabled yarns
  • Threads, twine, cordage, and rope

• Designation for Complex Yarns
  For complex yarns made by twisting two or more individual yarns together (e.g., plied or cabled yarns), the last inserted twist's direction is designated by the letters S or Z.

• Additional Notation
  In specific situations, lowercase letters "s" and "z" may be used, for example, to indicate the direction of winding or lay when a yarn is wrapped around a core like a wire.

Applications

The ISO 2:1973 standard is crucial for textile manufacturers, quality control laboratories, and product designers to ensure consistent communication and product specifications related to yarn twisting. Practical applications include:

• Manufacturing: Standardizing twist direction in production processes to achieve desired yarn qualities such as strength, elasticity, and appearance.
• Quality Assurance: Verifying yarn twist direction during inspections and testing, ensuring conformity with product standards.
• Product Design: Selecting appropriate yarn twist directions to influence the final textile product’s performance and aesthetics, including fabric hand and durability.
• Supply Chain Communication: Facilitating clear interchange of yarn specifications between suppliers, manufacturers, and customers globally.

Related Standards

While ISO 2:1973 specifically deals with the designation of twist direction in yarns and related products, it complements other textile standards under ISO Technical Committee 38 (Textiles), which cover:

• Yarn strength and testing methods
• Textile fibers identification
• Fabric construction and performance standards
• Terminology related to textile materials and processes

For professionals working with textile production, referencing ISO 2:1973 alongside these related standards ensures comprehensive quality and specification control.

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Keywords: ISO 2, yarn twist direction, S twist, Z twist, textile yarns, plied yarns, cabled yarns, yarn twist designation, textile standards, ISO textile standards, yarn intermediates

Standards Content (Sample)

INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAX OPTAHM3ALWfl no CTAHAAPTW3ALWiW.ORGANISATION INTERNATIONALE DE NORMALISATION
Textiles - Designation of the direction of twist in yarns and
related products
First edition - 1973-09-15
Ref. No. IS0 2-1973 (E)
UDC 677.061
Descriptors : textiles, yarns, twisting, orientation, designation.
Price based on 1 page
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the IS0 Council.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, International
Standard IS0 2 replaces IS0 Recommendation R 2-1966 drawn up by Technical
Committee I SO/TC 38, Textiles.
The Member Bodies of the following countries approved the Recommendation :
Australia Hungary Portugal
Austria India Romania
Belgium Israel South Africa, Rep. of
Canada Italy Sweden
Chile Mexico Switzerland
Czechoslovakia Netherlands United Kingdom
Denmark New Zealand U.S.A.
Finland Norway U.S.S.R.
France Poland Yugoslavia
No Member Body expressed disapproval of the Recommendation.
...

NORME INTERNATIONALE 2
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXAYHAPOAHAR OPTAHM3AUHR IIO CTAHAAPTM3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
r
Textiles - Indication du sens de torsion des fils et
' produits associes
Premiere 6dition - 1973-09-15
R6f. NO : IS0 2-1973 (F)
CDU 677.061
Descripteurs : textile, fil textile, torsion, orientation, designation.
Prix bash sur 1 page
AVANT-PROPOS
IS0 (Organisation lnternationale de Normalisation) est une federation mondiale
d'organismes nationaux de normalisation (Comites Membres ISO). L'elaboration de
Normes Internationales est confiBe aux ComitBs Techniques ISO. Chaque Comite
Membre interesse par une etude a le droit de faire partie du Comite Technique
correspondant. Les organisations internationales, gouvernementales et non
' gouvernementales, en liaison avec I'ISO, participent Bgalement aux travaux.
Les Projets de Normes Internationales adoptes par les Comites Techniques sont
soumis aux Comites Membres pour approbation, avant leur acceptation comme
Normes lnternationales par le Conseil de I'ISO.
Avant 1972, les resultats des travaux des Comites Techniques Btaient publies
comme Recommandations ISO; maintenant, ces documents sont en cours de
transformation en Normes Internationales. Compte tenu de cette procedure, la
Norme lnternationale IS0 2 remplace la Recommandation ISO/R 2-1966 Btablie
par le Comite Technique ISO/TC 38, Textiles.
Les Comites Membres des pays suivants avaient approuvk la Recommandation :
Afrique du Sud, Rep. d' Hongrie Po rtuga I
I nde Roumanie
Australie
Israel Roy aume U ni
Autriche
ltalie Suide
Belgique
Mexique Suisse
Canada
Chili Norv6ge Tchecosl ovaqu ie
Danemark Nouvelle-ZBlande U. R.S.S.
U.S.A.
Finlande Pays-Bas
Pologne Yougoslavie
France
Aucun Comite Membre n'avait desapprouve la Recommandation.
0 Organisation lnternationale de
...

NORME INTERNATIONALE 2
INTERNATIONAL ORGANIZATION FOR STANOAROIZATION .MEWlYHAPOAHAR OPrAHM3AUZIR IT0 CTAHAAPTM3AUWW *ORGANISATION INTERNATIONALE DE NORMALISATION
Textiles - Indication du sens de torsion des fils et
' produits associes
Premiere edition - 1973-09-15
CDU 677.061 Ref. NO : IS0 2-1973 (F)
Descripteurs : textile, fil textile, torsion, orientation, d6signation.
Prix bas6 sur 1 page
AVANT-PROPOS
IS0 (Organisation lnternationale de Normalisation) est une federation mondiale
d’organismes nationaux de normalisation (ComitBs Membres ISO). L‘blaboration de
Normes lnternationales est confiee aux Comites Techniques ISO. Chaque Comite
Membre interesse par une etude a le droit de faire partie du Comite Technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent Bgalement aux travaux.
Les Projets de Normes lnternationales adoptis par les Comites Techniques sont
soumis aux Comitbs Membres pour approbation, avant leur acceptation comme
Normes lnternationales par le Conseil de I’ISO.
Avant 1972, les resultats des travaux des Comites Techniques Btaient publies
ISO; maintenant, ces documents sont en cours de
comme Recommandations
transformation en Normes Internationales. Compte tenu de cette procedure, la
Norme lnternationale IS0 2 remplace la Recommandation ISO/R 2-1966 Btablie
par le Comite Technique ISO/TC 38, Textiles.
Les Comites Membres des pays suivants avaient approuvB la Recommandation :
Afrique du Sud, RBp. d’ Hongrie Portugal
lnde Roumanie
Austral i e
Israel Roy aume- U n i
Autriche
Belgique ltalie Suede
Canada Mexique Suisse
Chili Norvgge Tchbcoslovaqu ie
Danemark Nouvel le-ZBlande U. R.S.S.
Finlande Pays- Bas U.S.A.
Yougoslavie
France Pologne
la Recommandation.
Aucun Comitb Membre n‘avait dbsapprouv6
0 Organisation
...

SLOVENSKI SIST ISO 2
prva izdaja
STANDARD
maj 1995
Tekstilije - Ozna~evanje smeri vitja v preji in podobnih izdelkih
(identi~en z ISO 2:1973)
Textiles - Designation of the direction of twist in yarns and related
products
Textiles - Indication du sens de torsion des fils et produits associés
Deskriptorji: tekstilije, ozna~evanje smeri vitja, preja, vitje
Referen~na {tevilka
ICS 59.080.20 SIST ISO 2:1995 (sl)
Nadaljevanje na straneh od 2 do 4
© Standard je zalo`il in izdal Urad Republike Slovenije za standardizacijo in meroslovje pri Ministrstvu za znanost in tehnologijo.
Razmno`evanje ali kopiranje celote ali delov tega standarda ni dovoljeno.

SIST ISO 2 : 1995
UVOD
Standard SIST ISO 2, Tekstilije - Ozna~evanje smeri vitja v preji in podobnih izdelkih, prva
izdaja, 1995, ima status slovenskega standarda in je identi~en z mednarodnim standardom
ISO 2, Textiles - Designation of the direction of twist in yarns and related products, First
edition, 1973- 09-15.
PREDGOVOR
Slovenski standard SIST ISO 2:1995 je prevod mednarodnega standarda ISO 2:1973. Prevod
je pripravil tehni~ni odbor USM/TC TEK Tekstil in tekstilni izdelki.
Ta slovenski standard je dne 1995-03-01 odobril direktor USM.
ZVEZA S STANDARDOMA
S prevzemom tega standarda veljata naslednji zvezi:
- JUS F. S2. 051:1961 (sh) Fizikalna ispitivanja tekstila - Metoda odre|ivanja
usporedenosti pre|e
- JUS F. A0. 103:1981 (sh) Pre|e - Termini i definicije
OSNOVA ZA IZDAJO STANDARDA
- Prevod standarda ISO 2:1973
OPOMBI
- Povsod, kjer se v besedilu standarda uporablja izraz “mednarodni standard”, pomeni to
v SIST ISO 2:1995 “slovenski standard”.
- Uvod in predgovor nista sestavni del standarda.
SIST ISO 2 : 1995
VSEBINA stran
1. Namen in podro~je uporabe.4
2. Ozna~evanje enojnih prej in polizdelkov.
...