1、Designation: D6587 121Standard 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. A number in pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEThe units statement was updated editorially in October 2013.1. Scope1.1 This test method covers the measurement of yarnnumber of filament and spun yarns usi
3、ng automated testers.Some of the instruments are 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
4、 to Test Method D1907.1.2 The values stated in SI 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 and health practices a
5、nd determine the applica-bility of regulatory limitations prior to use.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
6、 Sampling 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 s
7、ystem.3.2 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,
8、and may be 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 resu
9、lts when 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 assis
10、tance is 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
11、for testing. 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
12、 to interpret 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.6.1.1 ACW (Automatic Cut and Weigh) Yarn Tester,3Series Tfor te
13、xtile yarns, Series BCF for bulked continuous filament1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1, 2012. Published October 2012. Originallyapproved in 2000. La
14、st previous edition approved in 2006 as D658700(2006)1.DOI: 10.1520/D6587-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page ont
15、he ASTM website.3Available from W. Fritz Mezger, Inc., 155 Hall St., Spartanburg, SC 29302-1523 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
16、 upfor at least 30 min before calibrating the scale.X1.1.2 Enter the computer command for 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 t
17、hetester as noted in the manufacturers manual.X1.2 OperationX1.2.1 Set ACW for operation 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 s
18、ubsequent operation of the instrument. (Atest canbe aborted at any time by pressing the 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 wa
19、ste gun areturned on and Yarn I transported under tension straight throughthe tester to 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
20、 the waste gun, and,simultaneously, the Inlet Jet 2 and the waste gun are shut off.The 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 int
21、erval and theaverage dtex (denier) of the yarn is calculated.X1.2.5 An air jet then blows 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 manufac
22、turers manual.X2. TEXTECHNO AUTOCOUNTX2.1 Preparation and CalibrationX2.1.1 Switch the 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 putdes
23、ired calibration weight on and check the calibration. Referto the manufacturers operation 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 (Statim
24、at TensileTester Insert)X2.2.1 The yarn travels through the yarn tension guides onthe top 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 receivin
25、gposition.X2.2.3 The feed arm grabs the yarn and pulls it into the niprolls. The draw-off arm places the yarn in the suction head andD6587 1215the 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 in
26、to the collection chamber, onthe balance.X2.2.4 After the specified length has been 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 an
27、d sent to the computer andsoftware, for conversion to the specified count system. 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
28、 ejected from the collectionchamber and the chamber is again lowered onto the balance 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 nex
29、tyarn into position to be tested.X2.3 Operation of the Autocount C ModelX2.3.1 The 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 i
30、nto the collectionchamber by means of an aspirator.X2.3.2 After the programmed length 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 i
31、s being collected in the collection chamber (continuousoperation).X2.3.3 After weighing 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 an
32、d nip roll feeding device. Knots or splices at thebeginning of a new yarn sample 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
33、.2 The yarn enters the tester from the left. A rapier armpulls the yarn into place, 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 ofyar
34、n from the package to the collection chamber. This speci-men is cut at the end coming 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
35、 waste container by an air jet.X3.1.4 The tester is designed to run continuously. 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 res
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38、ational Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown be
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