1、December 2015 English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 59.080.20!%IJc“2383964www.din.d
2、eDIN EN ISO 2061Textiles Determination of twist in yarns Direct counting method (ISO 2061:2015);English version EN ISO 2061:2015,English translation of DIN EN ISO 2061:2015-12Textilien Bestimmung der Drehung von Garnen Direktes Zhlverfahren (ISO 2061:2015);Englische Fassung EN ISO 2061:2015,Englisch
3、e bersetzung von DIN EN ISO 2061:2015-12Textiles Dtermination de la torsion des fils Mthode par comptage direct (ISO 2061:2015);Version anglaise EN ISO 2061:2015,Traduction anglaise de DIN EN ISO 2061:2015-12SupersedesDIN EN ISO 2061:2010-12www.beuth.deDocument comprises 18 pagesDTranslation by DIN-
4、Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.11.15 DIN EN ISO 2061:2015-12 2 A comma is used as the decimal marker. National foreword This document (EN ISO 2061:2015) has been prepared by Technical Committee ISO/TC 38 “Textiles” in collaboration wit
5、h Technical Committee CEN/TC 248 “Textiles and textile products” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-05-21 AA Physikalisch-technologisc
6、he Prfverfahren fr Textilien. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 139 DIN EN ISO 139 ISO 1890 DIN EN ISO 1890 Amendments This standard differs from DIN EN ISO 2061:2010-12 as follows: a) the formulae in Table 2 have been rev
7、ised; b) the Bibliography has been revised; c) the standard has been editorially revised. Previous editions DIN DVM 3801 : 1937-01 -3DIN DVM 3801-3 = DIN 53801-3: 1937x-12 DIN 53832: 1962-12, 1981-08 DIN EN ISO 2061: 1995-11, 2010-12 National Annex NA (informative) Bibliography DIN EN ISO 139, Texti
8、les Standard atmospheres for conditioning and testing DIN EN ISO 1890, Reinforcement yarns Determination of twist EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2061 July 2015 ICS 59.080.20 Supersedes EN ISO 2061:2010English Version Textiles - Determination of twist in yarns - Direct count
9、ing method (ISO 2061:2015) Textiles - Dtermination de la torsion des fils - Mthode par comptage direct (ISO 2061:2015) Textilien - Bestimmung der Drehung von Garnen - Direktes Zhlverfahren (ISO 2061:2015) This European Standard was approved by CEN on 20 June 2015. CEN members are bound to comply wit
10、h the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Manag
11、ement Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same sta
12、tus as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
13、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN
14、 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2061:2015 E. .1 Scope .2 Normative references 3 Terms and definitions .4 Principle 5 Apparatus .6 Standard atmosphere 7 Sampling 8 Test specimens8.1 Length .8.1.1 Single spun yarns .
15、 48.1.2 Single multifilament, plied, and cabled yarns . 48.2 Selection8.3 Number of test specimens .9 Procedure 1 Determination of the direction of twist 10 Procedure 2 Determination of the amount of twist 10.1 Preliminary procedure .10.2 Single, spun yarn . 910.3 Single, multifilament yarns . 910.4
16、 Plied yarns .1010.5 Cabled yarns .1011 Calculation of results 11.1 Average twist per specimen 11.2 Average twist per sample11.3 Variation of observations 1111.4 Change in length on untwisting .1111.5 Twist factor () 1212 Expression of results .1213 Test report 1213.1 General 1213.2 Single yarns .13
17、.3 Plied yarns . 113.4 Cabled yarns . 13Annex A (informative) Suggested procedure for sampling 15Bibliography .16Contents Page2 EN ISO 2061:2015 (E) 312111111998777766655443.European forewordDIN EN ISO 2061:2015-12 EN ISO 2061:2015 (E) 3 European foreword This document (EN ISO 2061:2015) has been pr
18、epared by Technical Committee ISO/TC 38 “Textiles” in collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by e
19、ndorsement, at the latest by January 2016, and conflicting national standards shall be withdrawn at the latest by January 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for i
20、dentifying any or all such patent rights. This document supersedes EN ISO 2061:2010. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Re
21、public, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. En
22、dorsement notice The text of ISO 2061:2015 has been approved by CEN as EN ISO 2061:2015 without any modification. DIN EN ISO 2061:2015-12 1 ScopeThis International Standard specifies a method for the determination of the direction of twist in yarns, the amount of twist, in terms of turns per unit le
23、ngth, and the change in length on untwisting, by the direct counting method.This International Standard is applicable toa) single yarns (spun and filament),b) plied yarns, andc) cabled yarns.Separate procedures are given for each type of yarn. The method is designed primarily for yarns in packages,
24、but, with special precautions, the procedures can be used for yarns taken from fabrics. It is not suitable for the determination of twist in a monofilament.NOTE See also ISO 1890, which was prepared especially for the needs of glass textile technology, and ISO 7211-4.This International Standard cove
25、rs the determination of twist in plied and cabled yarns as follows:a) in plied yarns: the final twist of the plied yarns and the original twist of the single yarn before plying;b) in cabled yarns: the final cabling twist of the yarn; the original twist of the plied yarn after plying, but prior to th
26、e last stage of processing; the twist of the single yarn before plying.If desired, the twist of single and plied yarn components, as they lie in the final structure, can be determined by the special procedure given in 10.5.7.This International Standard is not applicable, except by agreement, to yarn
27、s which stretch more than 0,5 % when the tension increases from 0,5 cN to 1,0 cN per unit linear density of the yarn expressed in tex. Such yarns can be tested under special conditions of tension which are accepted by all parties interested in the test results.This International Standard is not suit
28、able for products of open-end spinning and intermingled (interlaced) multifilament yarns.This International Standard is not applicable to yarns which are too large to permit their being placed in the clamps of the testing apparatus without crushing or distortion severe enough to affect the test resu
29、lts.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any am
30、endments) applies.4 EN ISO 2061:2015 (E) DIN EN ISO 2061:2015-12 ISO 2, Textiles Designation of the direction of twist in yarns and related productsISO 139, Textiles Standard atmospheres for conditioning and testing3 Terms and definitionsFor the purposes of this document, the following terms and def
31、initions apply.3.1twistnumber of turns about the axis of a yarn based on its nominal gauge length before untwistingNote 1 to entry: Twist should preferably be expressed as turns per metre (turns/m), but it may be expressed as turns per centimetre (turns/cm).3.2gauge lengthdistance between two effect
32、ive clamping points of the test specimen mounted in the testing equipment3.3initial lengthlength of a test specimen under a specified pretension at the beginning of a test3.4change in length on untwistingincrease or decrease in initial length observed when the specimen is untwisted Note 1 to entry:
33、Expressed as the percentage extension, or contraction, based on the specimens initial length.3.5moisture equilibrium for testingstate reached when the rate of increase in mass of a sample or specimen in a specified (test) atmosphere does not exceed the prescribed rate for the material being testedNo
34、te 1 to entry: See ISO 139.Note 2 to entry: A textile material is in moisture equilibrium with the ambient atmosphere when it does not exchange water with this atmosphere; its mass then remains constant as long as the experiment is carried out in an unchanged atmosphere. For test purposes, moisture
35、equilibrium is reached by absorption, starting from a relatively low moisture content.3.6yarn packagelength or lengths of yarn in a form suitable for use, handling, storing, or shippingNote 1 to entry: Packages may be comprised of unsupported yarn, such as balls, or supported yarn, such as skeins, c
36、akes, bobbins, cops, cones, pirns, spools, tubes, or beams.3.7twist factormeasure of the spiralling orientation of the fibres in a spun yarn or of the filaments in a filament yarnNote 1 to entry: The twist factor is related to the angle which fibres on the surface of the yarn make with the axis of t
37、he yarn and is a measure of the hardness of the resulting yarn due to twist.4 PrincipleThe twist in a known length of yarn is removed by rotating one end of the specimen with respect to the other until the components of the yarn being tested are parallel. The exact number of turns required to remove
38、 the twist is reported in terms of turns per unit length of yarn.5 EN ISO 2061:2015 (E) DIN EN ISO 2061:2015-12 5 Apparatus5.1 Twist counter, consisting of a pair of clamps, one of which is rotatable in either direction and positively connected to a revolution counter. The position of one or both cl
39、amps shall be adjustable to permit testing yarn lengths from 10 mm to 500 mm. There shall be no play in the clamp which might affect the gauge length.5.1.1 Means shall be provided for applying tension to the specimen and for rapidly determining the specimen length with an accuracy of 0,5 mm or 2 %,
40、whichever is smaller.NOTE The limit of 2 % is consistent with the highest accuracy required in counting the number of turns in the specimen.5.1.2 The counting device shall be capable of recording the number of revolutions of the rotatable clamp.5.1.3 If the contraction or extension of the untwisted
41、specimen is to be measured, the movable but non-rotatable clamp shall be capable of travelling with essentially no friction.5.2 Dissecting needle.5.3 Means for magnifying the specimen being tested.5.4 Equipment for reeling laboratory sample skeins (optional).6 Standard atmosphere6.1 The standard atm
42、ospheres for preconditioning, conditioning, and testing shall be as specified in ISO 139.The amount of twist is not affected directly by changes in relative humidity, but since wide changes in humidity cause changes in the length of some materials, all determinations should be made on samples in equ
43、ilibrium with the appropriate standard atmosphere.6.2 Generally, it is not necessary to precondition samples before conditioning for twist tests.7 Sampling7.1 Samples shall be taken in one of the following ways:a) according to the directions, if any, given in the material specification;b) according
44、to procedures approved by ISO for textile products, if directions on sampling are not included in the material specification;c) according to the method given in Annex A, if neither a) nor b) is applicable.1) Bulk samples shall be taken as directed in A.1.2) Laboratory-sample packages shall be taken
45、from the bulk sample as directed in A.2.6 EN ISO 2061:2015 (E) DIN EN ISO 2061:2015-12 8 Test specimens8.1 Length8.1.1 Single spun yarnsThe initial length of the specimen shall be as great as possible, but shall be somewhat less than the average length of the staple fibre used to spin the yarn. The
46、initial lengths of specimens listed in Table 1 are commonly used.Table 1 Specimen lengthsType of yarn materialSpecimen initial lengthmmCotton 10 and 25Worsted 25 and 50Woolen 25 and 50Bast fibre 100 and 2508.1.2 Single multifilament, plied, and cabled yarns8.1.2.1 Take an initial length of 250 mm 0,
47、5 mm if the nominal twist is 1 250 turns/m.8.1.2.2 Take an initial length of 500 mm 0,5 mm if the nominal twist is 1 250 turns/m.8.2 Selection8.2.1 Test specimens shall be taken, at the lowest tension practicable, from the end of the package if this is the normal method of use; otherwise, take the y
48、arn from the side of the package. Discard the few metres of yarn at the beginning and end of the package in order to avoid damaged sections.8.2.1.1 If it is desired to reel laboratory sample skeins, the yarn specimens shall be taken as specified in 8.2.1 and shall be representative of the original p
49、ackage.8.2.2 If two or more test specimens are taken from an individual yarn package, they shall be taken at random intervals of at least 1 m in order to minimize the effects of cyclic variation introduced during the manufacture. If more than two specimens are taken from an individual package, take groups of specimens, not more than five to a group, at intervals of several metres.8.3 Number of test specimens8.3.1 Take the number of specimens required in the mate
