1、Designation:D51904(Reapproved 2013)Standard Test Method forLength of Fiber in Wool Top1This standard is issued under the fixed designation D519;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 par
2、entheses 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 the averagelength and length distribution of fibers in wool top,on amass-biased basis.The method is applicabl
3、e to all types offibers in sliver formed from long parallelized fibers.NOTE1The determination of fiber length of wool is covered in TestMethod D1575,Test Method for Fiber Length of Wool in Scoured Wooland in Card Sliver,the staple length of grease wool is covered in TestMethod D1234,Test Method of S
4、ampling and Testing Staple Length ofGrease Wool.NOTE2This test method specifically requires length in inches andmass in SI units and is not contrary to ASTM policy.The SI units inparentheses are provided for information only.1.2 This standard does not purport to address all of thesafety concerns,if
5、any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1234 Test Met
6、hod of Sampling and Testing Staple Lengthof Grease WoolD1575 Test Method for Fiber Length of Wool in ScouredWool and in Card SliverD1776 Practice for Conditioning and Testing TextilesD4845 Terminology Relating to Wool3.Terminology3.1 DefinitionsFor definition of textile terms used in thistest method
7、 refer to Terminology D4845.3.1.1 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Method4.1 The weight(mass)of fibers,in definite lengthincrements,is determined for each specimen or group ofspecimens forming one sample.From the data obtained
8、,theweight-biased average fiber length and the weight-biaseddistribution is calculated.A cumulative weight average lengthfrequency curve may be plotted.5.Significance and Use5.1 Knowledge of the average fiber length and the distribu-tion of fibers is of primary importance to users of top in furtherp
9、rocessing.5.2 Acceptance specifications for the fiber length and lengthdistribution may be established by the user based on the type ofyarn-making equipment employed and the desired end uses.5.3 Test Method D519 for testing wool top for fiber lengthis considered satisfactory for acceptance testing o
10、f commercialshipments since the method has been used extensively in thetrade for acceptance testing and the current estimates of thebetween-laboratory precisions are acceptable.5.3.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesti
11、ng of commercial shipments,the purchaser and the sup-plier should conduct comparative testing to determine if thereis a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspec
12、imens that are as homogenous as possible and that arefrom a lot of the type material in question.The test specimensshould then be assigned in equal numbers to each laboratoryfor testing.The average results from the two laboratoriesshould be compared using Students t-test for unpaired dataand an acce
13、ptable probability level chosen by the two partiesbefore testing is begun.If a bias is found either its cause mustbe found and corrected or the purchaser and supplier mustagree to interpret future test results in the light of the knownbias.1This test method is under the jurisdiction ofASTM Committee
14、 D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1,2013.Published September 2013.Originallyapproved in 1938.Last previous edition approved in 2008 as D519 04(2008).DOI:10.1520/D0519-04R13.2For referenced ASTM standards,visit the A
15、STM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandardsvolume information,refer to the standards Document Summary page onthe ASTM websiteCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1(
16、Front View)(Rear View)1Frame.5Drawing clamp.2Faller bars.6Depressor.3Side comb.7Plush board.4Retaining bars.8Faller bar lifting plate.FIG.1 Wool Fiber Stapling ApparatusTABLE 1 Form with Recorded Data Showing the Calculation of the Average Fiber Length of Wool,the Standard Deviation,andCoefficient of VariationNOTE1When using equipment graduated in metric units,use class intervals 10 mm long,and calculate the average and standard deviation to thenearest 0.2 mm.Class Intervals,in.Mass,gPercentages
