ASTM D519-2004(2008) Standard Test Method for Length of Fiber in Wool Top《羊毛条中纤维长度的标准试验方法》.pdf
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1、Designation: D 519 04 (Reapproved 2008)Standard Test Method forLength of Fiber in Wool Top1This standard is issued under the fixed designation D 519; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er 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 the averagelength and length distribution of fibers in wool top, on amass-biased basis. The meth
3、od is applicable to all types offibers in sliver formed from long parallelized fibers.NOTE 1The determination of fiber length of wool is covered in TestMethod D 1575, Test Method for Fiber Length of Wool in Scoured Wooland in Card Sliver, the staple length of grease wool is covered in TestMethod D 1
4、234, Test Method of Sampling and Testing Staple Length ofGrease Wool.NOTE 2This 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
5、 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 and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relati
6、ng to TextilesD 1234 Test Method of Sampling and Testing Staple Lengthof Grease WoolD 1575 Test Method for Fiber Length of Wool in ScouredWool and in Card SliverD 1776 Practice for Conditioning and Testing TextilesD 4845 Terminology Relating to Wool3. Terminology3.1 Definitions: For definition of te
7、xtile terms used in thistest method refer to Terminology D 4845.3.1.1 For definitions of other textile terms used in this testmethod, refer to Terminology D 123.4. Summary of Test Method4.1 The weight (mass) of fibers, in definite length incre-ments, is determined for each specimen or group of speci
8、mensforming one sample. From the data obtained, the weight-biasedaverage fiber length and the weight-biased distribution iscalculated. A cumulative weight average length frequencycurve may be plotted.5. Significance and Use5.1 Knowledge of the average fiber length and the distribu-tion of fibers is
9、of primary importance to users of top in furtherprocessing.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 D 519 for testing wool top for fiber lengthi
10、s considered satisfactory for acceptance testing of 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 resul
11、ts when using this test method for acceptancetesting 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 mi
12、nimum, the two parties should take a group of testspecimens 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 com
13、pared using Students t-test for unpaired dataand an acceptable 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.1Th
14、is test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved Aug. 1, 2008. Published October 2008. Originallyapproved in 1938. Last previous edition approved in 2004 as D 519 04.2For refere
15、nced ASTM standards, visit the ASTM 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 website1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Co
16、nshohocken, PA 19428-2959, United States.(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
17、 of Wool, the Standard Deviation, andCoefficient of VariationNOTE 1When 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, g PercentagesCumulative FrequenciesFirst Cumulative,less
18、 thanSecond Cumulative,less than6.0 to 6.5 0.014 2.4 100.0 840.15.5 to 6.0 0.010 1.7 97.6 740.15.0 to 5.5 0.013 2.2 95.9 642.54.5 to 5.0 0.018 3.1 93.7 546.64.0 to 4.5 0.038 6.5 90.6 452.93.5 to 4.0 0.051 8.7 84.1 362.33.0 to 3.5 0.062 10.6 75.4 278.22.5 to 3.0 0.072 12.3 64.8 202.82.0 to 2.5 0.079
19、13.5 52.5 138.01.5 to 2.0 0.080 13.6 39.0 85.51.0 to 1.5 0.065 11.0 25.4 46.50.5 to 1.0 0.045 7.7 14.4 21.10 to 0.5 0.039 6.7 6.7 6.7Totals 0.586 100.0 = ( 840.1 4363.3Divided by ( percentages F1= 8.40 F2= 43.63B = the largest midpoint value for which a frequency is recorded = 6.25 in.m = the class
20、interval = 0.5 in.Percentage of fibers under 2 in. = 39.0 %.Calculations:X5 B 2 mF12 1! 5 6.25 2 0.58.40 2 1! 5 2.55 in.s 5 m=2F22 F12 F125 0.5 =87.26 2 8.40 2 70.56 5 1.44 in.v 5 100 s/X!5100 31.4/2.6!556.47 %.where:X5 average fiber length of wool,s 5 standard deviation, andv 5 coefficient of varia
21、tion.D 519 04 (2008)26. Apparatus6.1 Comb Sorter, which can be used to separate long fibersinto 0.50-in. (12.7-mm) groups and the shorter fibers into0.25-in. (6.4-mm) groups.3The essential parts are shown inFig. 1. The bar or comb intervals are set at 0.5 in. (12.7 mm)and 0.25 in. (6.4 mm).NOTE 3Ess
22、entially, the same facilities can be secured with two Baeror two Zweigle sorters, or two Shirley units.6.1.1 Faller Bars, free of broken, missing, crooked, dull, orcorroded pins ( 2, Fig. 1).6.1.2 Clamp, with jaws that meet straight and flush, andimpart uniform pressure when closed (5, Fig. 1).6.1.3
23、 Depressor, at least as long as the sorter (6, Fig. 1).6.2 Balance, with a sensitivity of 0.1 mg.6.3 Cardboard Cylinder, approximately 3 in. (75 mm) indiameter, 8 in. (200 mm) in length, and having a18-in. (3-mm)wall thickness.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take four
24、 lot sampling units (bales or cartons) for each 20 000lb (9000 kg) or fraction thereof.7.2 Laboratory SampleAs a laboratory sample for accep-tance testing, draw one section of sliver from the balled top, atleast 1 yd (1 m) in length from each lot sample unit. Materialshould be taken from the outside
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