1、Designation: D6587 12 (Reapproved 2018)Standard Test Method forYarn Number Using Automatic Tester1This standard is issued under the fixed designation D6587; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the measurement of yarnnumber of filament and spun yarns using automated testers.Some of the instruments are
3、 stand-alone and others are optionalmodules for instruments that perform additional tests.1.1.1 The instruments are capable of measuring yarn num-bers up to 4000 dtex (3600 denier).NOTE 1For determination of yarn number by use of reel and balance,refer to Test Method D1907.1.2 The values stated in S
4、I units are to be regarded asstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability
5、of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World
6、Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD1907 Test Method for Linear Density of Yarn (Yarn Num-ber) by the Skein MethodD2258 Practice for Sampling
7、 Yarn for TestingD4849 Terminology Related to Yarns and Fibers3. Terminology3.1 For all terminology relating to D13.58, Yarns andFibers, refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:cotton count, denier, linear density, tex, yarn number, yarnnumbering system.3.2
8、 For all other textile terms used in this test method, seeTerminology D123.4. Summary of Test Method4.1 A specified length of yarn (specimen) is automaticallystripped directly from the package, cut, and weighed. The yarnnumber is calculated by an interfaced computer, displayed on amonitor, and may b
9、e printed. The yarn number can be reportedin tex, denier, or cotton count units.5. Significance and Use5.1 This test method for yarn number is satisfactory foracceptance of commercial shipments and is used in the trade.5.1.1 In case of a dispute arising from differences inreported test results when
10、using this Test Method for accep-tance testing of commercial shipments, the purchaser and thesupplier should either use the referee Test Method D1907 foryarn number or conduct comparative tests to determine if thereis a statistical bias between their laboratories. Competentstatistical assistance is
11、recommended for the investigation ofbias. As a minimum, the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question. The testspecimens should then be randomly assigned in equal numbersto each laboratory for testi
12、ng. The average results from the twolaboratories should be compared using appropriate statisticalanalysis and a probability level chosen by the two partiesbefore the testing is begun. If a bias is found, either its causemust be found and corrected or the purchaser and the suppliermust agree to inter
13、pret future test results with consideration tothe known bias.5.2 This test method is also used for the quality control forboth filament and spun yarns.6. Apparatus6.1 Automatic Yarn Numbering Instrument, with interfacedcomputer.1This test method is under the jurisdiction of ASTM Committee D13 on Tex
14、tilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1, 2018. Published August 2018. Originallyapproved in 2000. Last previous edition approved in 2012 as D6587121. DOI:10.1520/D6587-12R18.2For referenced ASTM standards, visit the ASTM websit
15、e, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesT
16、his international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade
17、(TBT) Committee.16.1.1 ACW (Automatic Cut and Weigh) Yarn Tester,3Series Tfor textile yarns, Series BCF for bulked continuous filament(BCF) carpet yarns, and Series I for industrial yarns. See Fig.1. The different series testers have different systems fortensioning yarns and different yarn running s
18、peeds.6.1.2 Autocount C4See Fig. 2.6.1.3 Autocount TTA4See Fig. 3.6.1.4 Yarn Count Analyzer (YCA)5See Fig. 4.6.2 Calibration WeightsTwo grams and others as neededto cover the dtex (denier) ranges of interest.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing, takeat random the number of
19、 shipping units directed in anapplicable material specification or other agreement betweenthe purchaser and the supplier, such as an agreement to usePractice D2258. Consider shipping cases or other shippingunits to be the primary sampling units.NOTE 2An adequate specification or other agreement betw
20、een thepurchaser and the supplier requires taking into account the variabilitybetween shipping units, between packages or ends within a shipping unit,and between specimens from a single package to provide a sampling planwith a meaningful producers risk, consumers risk, acceptable qualitylevel, and l
21、imiting quality level.7.2 Laboratory SampleAs a laboratory sample for accep-tance testing, take at random from each shipping unit in the lotsample the number of packages directed in an applicablematerial specification or other agreement between the pur-chaser and the supplier such as an agreement to
22、 use PracticeD2258. Preferably, the same number of packages should betaken from each shipping unit in the lot sample. If differingnumbers of packages are to be taken from shipping units in thelot sample, determine at random which shipping units are tohave each number of packages drawn.7.3 Test Speci
23、menTest one specimen from each packageof filament yarn and five specimens from each package of spunyarn. See Table 1 for the length of yarn in a specimen.8. Conditioning8.1 Precondition and condition the specimens, as directed inPractice D1776.9. Preparation and Calibration of Apparatus9.1 Set up an
24、d calibrate the tester using the manufacturersmanual and the appropriate appendix of this test method.10. Procedure10.1 Check each package for cleanliness, overthrown ends,and any package formation which might interfere with thefree-running of the yarn from the package.10.2 Position packages to be t
25、ested with the thread linepassing in a straight line from the package to the inlet tubewithout snags or additional tension added. Packages may bebeneath or above the inlet jet or tube, as position does not affectthe results.10.2.1 If the instrument uses a package changer, place thepackage in a creel
26、 and string up the yarn in a manner to preventsnagging or tangling of the ends and excessive tension on theyarn.10.2.2 Prestripping packages is not necessary because theinstruments can be set to prestrip for a specified time beforetesting.10.3 String up the yarns, input sample, and specimeninformati
27、on and test the specimens as directed in the manufac-turers manual. See the appendixes for general informationspecific to the instrument.10.4 Test all specimens in the standard atmosphere fortesting as directed in Practice D1776.3Available from W. Fritz Mezger, Inc., 155 Hall St., Spartanburg, SC 29
28、302-1523 and Lenzing Technik GrmbH yarn; yarn numberAPPENDIXES(Nonmandatory Information)X1. ACW (AUTOMATIC-CUT-AND-WEIGH) TESTERX1.1 Preparation and CalibrationX1.1.1 Turn on the motor and allow the tester to warm upfor at least 30 min before calibrating the scale.X1.1.2 Enter the computer command f
29、or automatic zeroingand calibrationX1.1.3 To eliminate errors due to long-term drift, set thetester to automatically tare the balance after each set of 20tests.X1.1.4 Make other periodic checks and inspection of thetester as noted in the manufacturers manual.X1.2 OperationX1.2.1 Set ACW for operatio
30、n in Mode 2 (Textile 10 to 520denier). For heavy denier use Mode 3 (550 to 1200 denier).X1.2.2 Sampling and specimen information is input to thecomputer in response to prompts. The following sectionsdescribe the subsequent operation of the instrument. (Atest canbe aborted at any time by pressing the
31、 STOP button, whichinitiates a cleaning cycle.)X1.2.3 The end of the yarn is held near the inlet jet (tube).When a photocell senses the hand or yarn end or the STARTbutton is pressed, Inlet Jets 1 and 2 and the waste gun areturned on and Yarn I transported under tension straight throughthe tester to
32、 the waste container. When the yarn is sensed onexit from Inlet Jet 2, Inlet Jet 1 is turned off, the nip rollsclosed, and yarn is stripped from the package for a specifiedtime.X1.2.4 The yarn is then cut ahead of the waste gun, and,simultaneously, the Inlet Jet 2 and the waste gun are shut off.The
33、divert gun is turned on and the yarn specimen is blownonto the balance. When the specified specimen length isobtained, the inlet cutter cuts the yarn. After 3-s dwell, thebalance weighs the specimen over a 2-s interval and theaverage dtex (denier) of the yarn is calculated.X1.2.5 An air jet then blo
34、ws the specimen off the balanceinto the waste container.X1.3 Other InformationX1.3.1 Computer commands and prompts, error messages,diagnostic test commands, and trouble shooting informationare given in the manufacturers manual.X2. TEXTECHNO AUTOCOUNTX2.1 Preparation and CalibrationX2.1.1 Switch the
35、tester on and allow the tester to warm upfor at least 30 min before calibrating the balance.X2.1.2 Zero the balance by pressing its “T” or “Tare” key.Use the automatic calibration function of the balance or putdesired calibration weight on and check the calibration. Referto the manufacturers operati
36、on manual for calibration details.X2.1.3 During operation the balance will tare automaticallybefore each new test or before each new package (as selectedin the software).X2.2 Operation of the Autocount TTA (Statimat TensileTester Insert)X2.2.1 The yarn travels through the yarn tension guides onthe t
37、op rear of the tensile tester.X2.2.2 The collection chamber is lowered onto the balanceand it tares the weight of the chamber from the balance. Aftertaring the weight of the chamber, it is lifted into the receivingposition.X2.2.3 The feed arm grabs the yarn and pulls it into the niprolls. The draw-o
38、ff arm places the yarn in the suction head andD6587 12 (2018)5the cutters cut the yarn to have a well-defined beginning. Thenip rolls reel off (skein) a specified length of yarn into thesuction head and are aspirated into the collection chamber, onthe balance.X2.2.4 After the specified length has be
39、en collected, thesuction head cutters cut the yarn. Any slight variation in the settest length is compensated for in the calculation.X2.2.5 The collection chamber is lowered onto the balanceand the weight is recorded and sent to the computer andsoftware, for conversion to the specified count system.
40、 If theyarn number of twisted yarn is measured, but yarn number ofuntwisted material is required, a calibration curve shall beused. The untwisted data must be obtained as directed in TestMethod D1907. The sample is then ejected from the collectionchamber and the chamber is again lowered onto the bal
41、ance totare the weight of the chamber.X2.2.6 If tensile tests were required and specified in thesoftware, the Statimat performs the tensile tests, and, after thelast break, the yarn is cut and the magazine moves the nextyarn into position to be tested.X2.3 Operation of the Autocount C ModelX2.3.1 Th
42、e yarn passes through a tension device and intothe tester from the top. A cutter cuts the yarn end in order tohave a well-defined beginning of the section to be tested. A niproll feeding device reels (skeins) the yarn into the collectionchamber by means of an aspirator.X2.3.2 After the programmed le
43、ngth has been collected inthe chamber, the cutter cuts the yarn end. A flap at the bottomof the collection chamber opens and the yarn sample will fallonto the balance. While the sample is being weighed, the nextsample is being collected in the collection chamber (continuousoperation).X2.3.3 After we
44、ighing the sample, an air jet blows thesample from the balance and into a waste container.X2.3.4 The version for combined use with another tester,such as the Dynafil, is equipped with a yarn switch instead ofa cutter and nip roll feeding device. Knots or splices at thebeginning of a new yarn sample
45、are automatically cut off andblown into the waste chamber. The length of the yarn ismeasured by the intake godet of the Dynafil.X3. YARN COUNT ANALYZER (YCA) TESTERX3.1 OperationX3.1.1 The balance tares the chamber.X3.1.2 The yarn enters the tester from the left. A rapier armpulls the yarn into plac
46、e, passing it through an adjustablepretensioning device. The yarn is then cut and the beginningend is suctioned into the waste container. As the waste isremoved, the nip rolls start and transport a measured length ofyarn from the package to the collection chamber. This speci-men is cut at the end co
47、ming from the package.X3.1.3 The chamber with the specimen is lowered onto thebalance and the mass recorded after the balance has stabilized.The yarn number is calculated and the specimen is ejected fromthe balance to a waste container by an air jet.X3.1.4 The tester is designed to run continuously.
48、 Thecollected specimen is transferred from the collection chamberto a balance chamber. Then, while a specimen on the balanceis being weighed, the next specimen is being collected.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item me
49、ntionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive caref
