1、BRITISH STANDARD BS ISO 7211-5:1984 Textiles Woven fabrics Construction Methods of analysis Part 5: Determination of linear density of yarn removed from fabric ICS 59.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 7211-5:1984 This British Standard, having been pr
2、epared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 20 May 2002 BSI 20 May 2002 ISBN 0 580 39660 6 National foreword This British Standard reproduces verbatim ISO 7211-5:19
3、84 and implements it as the UK national standard. It supersedes BS 2865:1984 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: A list of organizations represented on this committee c
4、an be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using th
5、e “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from
6、 legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the U
7、K. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, the ISO foreword page, pages 1 to 4, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since pub
8、lication Amd. No. Date Commentsinternational Standard 7211/S INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)KYHAPOl-iAR OPTAHM3AUMR IlO CTAHJLAPTbl3AL(blklORGANISATlON INTERNATIONALE DE NORMALISATION Textiles - Woven fabrics - Construction - Methods of analysis - Part 5: Determination of linear d
9、ensity of yarn removed from fabric Textiles - Tlssus - Construction - IWthodes danalyse - Partie 5: Dhtermina tion de la masse lin6ique dun fil prklev6 dans un tissu First edition - 1984-03-15 UDC 677.061 : 677.017.272 Ref. No. IS0 7211/5-1984 E) Descriptors : textiles, woven fabrics, tests, determi
10、nation, linear density, yarns, test specimens, test equipment, test results. ecirP desab no 4 segap Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of developing International Standards is carried
11、out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been authorized 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. Draf
12、t 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. International Standard IS0 7211/5 was developed by Technical Committee ISO/TC 38, Textiles, and was circulated to the
13、member bodies in November 1982. It has been approved by the member bodies of the following countries: Australia Belgium Brazil Bulgaria Canada China Czechoslovakia Egypt, Arab Rep. of Finland Germany, F. R. Ghana Hungary India Iran Iraq Israel Italy Jamaica Japan Korea, Rep. of Mexico Netherlands Ne
14、w Zealand Poland The member body of the following technical grounds : country expressed disapproval of the document on 0 France Portugal Romania South Africa, Rep. of Spain Sweden Tanzania Thailand Turkey United Kingdom USA USSR Venezuela lanoitanretnI noitazinagrO rof ,noitazidradnatS 4891 detnirP
15、ni dnalreztiwS INTERNATIONAL STANDARD IS0 7211/5-1984 (El Textiles - Woven fabrics - Construction - Methods of analysis - Part 5: Determination of linear density of yarn removed from fabric 0 Introduction The method for determining the linear density of yarn from a fabric differs from that of yarn f
16、rom a package in that, in the former instance, the crimp imposed upon the yarn by the interlacing of warp and weft must be taken into account. Also, the long lengths of yarn used in tests from a package may not conveniently be taken from a fabric. The results ob- tained may be subject to appreciable
17、 personal error unless a standard method is adopted and adequate samples are taken. This part of IS0 7211 is divided into four sections. Sections one and four deal with items applicable to both methods; section two specifies the method for determination of the linear density of yarn removed from fab
18、ric, without removal of non-fibrous matter; and section three specifies the method for determina- tion of linear density of yarn removed from fabric after removal of non-fibrous matter. It may be noted that the linear density of yarn obtained by these methods may not be same as that of the original
19、yarn used in the fabric. Is0 7211/5-1984 (El Section one : General 1 Scope and field of application This part of IS0 7211 specifies methods for the determination of linear density of yarn removed from fabric. It relates to yarns of nominally uniform linear density; it describes the method of removin
20、g threads from fabric, and specifies the number of threads whose straightened length is to be determined and the methods of determining the mass of all the threads. 2 References IS0 139, Textiles - Standards atmospheres for conditioning and testing. ISO/TR 5090, Textiles - Method for the removal of
21、non- fibrous matter prior to quantitative analysis of fibre mixtures. IS0 674114, Textiles - Fibres and yarns - Determination of commercial mass of consignments - Part 4: Values used for commercial allowances and commercial moisture regains. 1) IS0 721113, Textiles - Woven fabrics - Construction - M
22、ethods of analysis - Part 3: Determination of crimp of yarn in fabric. 3 Principle Threads are removed from rectangular strips of fabric, the straightened length of a portion of them is determined and their mass is determined either in equilibrium with the standard at- mosphere for testing (method A
23、) or oven-dry plus the commer- cial allowance given in IS0 6741/4 (method B). Linear density is calculated from the mass and the sum of the straightened lengths. When heating to 105 OC is likely to cause appreciable loss of volatile matter other than water, method A should be used. The determination
24、 may be carried out without removal of non- fibrous matter (section two), or after removal of non-fibrous matter (section three). At present at the stage of draft Technical Report. 4 Apparatus 4.1 Balance, be weighed. a ccurate to 0,l % of the smallest quantity to 4.2 Apparatus for determining the s
25、traightened length of threads (see apparatus specified in IS0 721 l/3). 4.3 Ventilated drying oven (method B). 5 Conditioning and testing atmosphere The standard atmospheres for pre-conditioning, conditioning and testing textiles specified in IS0 139 shall be used. 6 Test specimens Expose to the atm
26、osphere for testing for at least 24 h sufficient fabric, which should preferably include yarn from at least five weft packages, to provide the required number of test specimens. Cut from the conditioned fabric at least two rectangular strips containing different warp ends for determining the linear
27、den- sity of warp yarns, and at least five rectangular strips repre- senting different weft packages for determining the linear den- sity of weft yarns. NOTE - All the strips should preferably be of the same length and about 50 cm long. Their width should be such as to contain at least 50 lengths of
28、 either warp or weft yarn, whichever is under examina- tion. Obtain the threads from these strips as required as specified in IS0 7211/3. During these operations, keep warp threads separate from weft threads. IS0 7211/5-1984 (El Section two: Determination of linear density of yarn removed from fabri
29、c without removal of non-fibrous matter 7 Procedure 7.1 Separation of threads and measurement of length them to that atmosphere for 24 h or until there is no progres- sive change in mass greater than 0,l % in successive expo- sures of at least 30 min duration. Remove the first 10 threads from each s
30、trip and determine their straightened lengths, all as specified in IS0 7211/3. Then remove at least 40 more threads from each strip. 7.2 Method A - Conditioning to equilibrium with the standard atmosphere Weigh all the warp threads together and each group of 50 weft threads separately. 7.3 Method B
31、- Oven-dry plus commercial allowance Pre-condition the specimen for 4 h in the standard atmosphere for pre-conditioning specified in IS0 139. After pre-conditioning, bring the specimens to moisture equi- librium with the standard atmosphere for testing by exposing Dry the specimens to constant mass
32、in the ventilated drying oven (4.3) until successive weighings at intervals of 20 min (specimen weighed inside oven) or 40 min (specimen weighed outside oven) show no progressive change in mass greater than 0,l %. Weigh all the warp threads together and each group of 50 weft threads separately. Sect
33、ion three: Determination of linear density of yarn removed from fabric after removal of non-fibrous matter 8 Procedure 8.2 Removal of non-fibrous matter 8.1 Separation of threads and measurement of length Remove any non-fibrous matter, using a procedure given in ISO/TR 5090. Remove the first 10 thre
34、ads from each strip and determine their straightened lengths, all as specified in IS0 7211/3. Then remove at least 40 more threads from each strip.1) After removal of non-fibrous matter from the specimens, follow the procedure in method A (see 7.2) or method B (see 7.3) as given in section two. 1) W
35、here the non-fibrous matter interferes with the separation of threads, it will be necessary to remove it first, but it should be noted that this may affect the length of the threads. If the non-fibrous matter is removed before the threads are separated, expose the extracted fabric to the standard at
36、mosphere for testing for at least 6 h before determining the straightened length. 3 IS0 7211/5-1984 (E) Section four: Calculation and expression of results and test report 9 Calculation and expression of results Calculate the linear density by converting the total length and total mass of warp threa
37、ds and weft threads into units of the tex system, as shown in the equations below. 9.1 Method A Calculate the linear density of the yarns from the following equation : Linear density of the conditioned yarn, in tex units mass of threads taken from fabric, in grams x 1 000 = total length of threads,
38、in metres where total length = mean straightened length x number of threads weighed. 9.2 Method B Calculate the linear density of the yarns from the following equation: Linear density of the oven-dry yarn, in tex units mass of the oven-dry threads taken from fabric, in grams x 1 000 = total length o
39、f threads, in metres where total length = mean straightened length x number of threads weighed. Linear density of the oven-dry yarn plus commercial allowance linear density of oven-dry yarn x (100 + K) = 100 where K is the commercial allowance given in IS0 6741/4. 10 Test report The test report shal
40、l include the following particulars: a) a reference to this International Standard (IS0 7211/5); b) the standard atmosphere used (temperate or tropical); c) the actual method used, i.e. method A or method B, either I) without removal of non-fibrous matter (section two) or 2) after removal of non-fib
41、rous matter (section three); d) the method used for removal of non-fibrous matter, if carried out; e) the linear density of the warp; f) the linear density of the weft; g) details of any deviation from the method. sihT egap yllanoitnetni tfel knalb BS ISO 7211-5:1984 BSI 389 Chiswick High Road Londo
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