7211/2 International Standard (TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEXAYHAPOAHAA OPIAHW3AWR NO CTAHAAPTW3AUWW-ORGANISATION INTERNATIONALE DE NORMALISATION Textiles - Woven fabrics - Construction - Methods of analysis Part 2: Determination of number of threads per unit length Textiles - Tissus - Construction -- Methodes d'analyse -- Partie 2: Détermination du nombre de fils par unité de longueur First edition - 1984-03-15 ;07211/2-1984(E) UDC 677.064 : 677.017.353 Ref.No. ISO7211/2-1984 (E) Descriptors:textiles,wovenfabrics,tests,determination,numbers,yarns. Price based on 6 pages No reproduction or networking permited without license from IHS Not for Resale Foreword ISO(the International Organization for Standardization)is a worldwide federation of national standards bodies (isO member bodies). The work of developing International Standards is carried out through iSO technical committees. Every member body interested in a subjectfor which a technical committee has beenauthorized has the right to be represented on that committee. International organizations, governmental andnon-governmental,in liaisonwithisO,alsotakepart inthework. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO7211/2 was developed by Technical Committee ISO/TC38,Textiles,andwascirculatedtothememberbodiesinNovember1982 It has been approved by the member bodies of the following countries: Australia India Portugal Belgium Iran Romania Brazil Iraq South Africa, Rep. of Bulgaria Israel Spain Canada Italy Sweden China Jamaica Tanzania Czechoslovakia Japan Turkey Egypt, Arab Rep. of Korea, Rep. of United Kingdom Finland Mexico USSR Germany, F.R. Netherlands Venezuela Ghana New Zealand Hungary Poland The member body of the following country expressed disapproval of the document on technical grounds: France @InternationalOrganizationforStandardization,1984 Printed in Switzerland Copyriaht intematioal Organizatin for Standardizatin No reproduction or networking permitted without license from IHS Not for Resale ISO 7211/2-1984 (E) INTERNATIONALSTANDARD Textiles Woven fabrics Construction - Methods of analysis - Part 2: Determination of number of threads per unit length Scope and field of application Method C: The number of threads per centimetre of the fabric is determined with the aid of a traversing thread This part of ISo 7211 specifies three methods for the deter- counter. mination of thenumber of threads per centimetre in woven fabrics. Any of the three methods may be used, the choice depending on the character of the fabric. However, in case of Minimum measuring distance dispute method A is recommended. Use the appropriate minimum measuring distance specified in Method A: Dissection of fabric, suitable for all fabrics. the table. This is the most laborious method but has fewer limitations than the others; in particular, it is the only one that is really Table -- Minimum measuring distance suitablefor the examination of certainfolded structuresand othercomplicatedweaves. Number Minimum Number Accuracy in Method B: Counting glass, suitable for woven fabrics of threads measuring of threads percentage with more than 50 threads per centimetre. percentimetre distance pertest piece (counttowithin cm 0,5 thread) Method C: Traversing thread counter, suitable for all Less than 10 10 Less than 100 Greater than 0,5 fabrics. 10 to 25 5 50 to 125 1,0 to 0,4 25 to 40 3 75 to 120 0,7 to 0,4 Where the number of threads per centimetre is low, it may Morethan40 2 More than 80 Less than 0,6 be convenient to express the results as the number of threads per decimetre. For the method A, take test pieces containing at least NOTE -- Methods using parallel line gratings and tapered line 100 threads. gratings have been given in the annex for information. These methods have not been considered accurate enough t