ASTM D1234-1985(2001) Standard Test Method of Sampling and Testing Staple Length of Grease Wool《含脂羊毛的手扯长度的取样和试验方法》.pdf

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1、Designation: D 1234 85 (Reapproved 2001)Standard Test Method ofSampling and Testing Staple Length of Grease Wool1This standard is issued under the fixed designation D 1234; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o

2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method2covers procedures for sampling andmeasuring the unstretched staple length, and variability inlengt

3、h, of grease or pulled wool staples. The test method is alsoapplicable to mohair and other animal fibers in staple form. Theprocedure is not recommended for individual fibers or groupsof straightened fibers.NOTE 1The determination of fiber length in wool top is covered inTest Method D 519, the deter

4、mination of fiber length of wool is coveredin Test Method D 1575.1.2 The values stated in inch-pound units are to be regardedas the standard. The values stated in SI units are provided forinformation purposes only.1.3 This standard does not purport to address the safetyconcerns, if any, associated w

5、ith its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 123 Terminology Relating to Textiles3D 519 Test Method for Length of

6、 Fiber in Wool Top3D 1575 Test Method for Fiber Length of Wool in ScouredWool and Card Sliver3D 4271 Practice for Writing Statements on Sampling in TestMethods for Textiles43. Terminology3.1 Definitions:3.1.1 grease wool, nwool taken from the living sheep andwhich has not been commercially scoured.3

7、.1.2 staple, nin grease wool, a tuft or lock of fiberswhich naturally cling together, as found in a fleece.3.1.3 staple length, nin grease wool, the length of a stapleobtained by measuring the natural staple without stretching ordisturbing the crimp of the fibers.3.1.4 For definitions of other terms

8、 used in this test method,refer to Terminology D 123.4. Summary of Test Method4.1 By hand or by means of a sampling tool, staples(subsampling units) are withdrawn from randomly selectedsampling units (bags, bales, or packages) from a lot of wool orother animal fibers. The unstretched lengths of the

9、staples aremeasured and the average staple length, standard deviation,and coefficient of variation calculated.5. Significance and Use5.1 The testing procedure in this test method for thedetermination of staple length is considered satisfactory foracceptance testing of commercial shipments of grease

10、woolsince the method has been used in the trade for acceptancetesting.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments, the purchaser and the sup-plier should conduct comparative tests to determine i

11、f there isa statistical bias between their laboratories. Competent statis-tical assistance is recommended for the investigation of bias.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. T

12、he testspecimens should then be randomly assigned in equal numbersto each laboratory for testing. The average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before the testing is begun. If a bias

13、 is found, eitherits cause must be found and corrected, or the purchaser and thesupplier must agree to interpret future test results in the light ofthe known bias.5.2 The test method is used for the determination of theaverage unstretched staple length and the staple length distri-bution of a lot of

14、 wool in order to assign length classes whendetermining the conformance of lots and shipments to lengthspecifications.5.3 In this test method, the size of a lot covered by the testprocedure is limited to not more than 200 packages per test.Any shipment exceeding the above limits is divided into lots

15、within the prescribed limits.5.4 The nature of the sampling procedure is such that grease1This method is under the jurisdiction of ASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.13 on Wool and Wool Felt.Current edition approved Oct. 21, 1985. Published December 19

16、85. Originallypublished as D 1234 52 T. Last previous edition D 1234 80.2Further information covering the procedures and techniques described in thismethod appears in D. D. Johnston, H. Dean Ray, W. J. Manning, and E. M. Pohle,“Relationships of Staple Length in Grease Wool and Resultant Top,” Textil

17、eResearch Journal, Vol 21, October 1951, pp. 757762.3Annual Book of ASTM Standards, Vol 07.01.4Annual Book of ASTM Standards, Vol 07.02.1Copyright ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.wool staples as originally drawn from the wool of the lotrequire only a slig

18、ht amount of preparation before measure-ment. The bulk and laboratory samples are synonymous in thismethod.5.5 Compression of wool in the bale makes it difficult topenetrate the interior of the bale with the sampling tool.However, staples can be drawn from the surface of the balewith the sampling to

19、ol or by hand.5.6 Practice D 4271 contains information on how to write asection on sampling in test methods.NOTE 2An extensive discussion of grease wool staple sampling canbe found in the literature.56. Apparatus6.1 Sampling ToolA spear-shaped tool with a hook orbarb at one end for use in extracting

20、 a small quantity of woolfrom within a bag (Fig. 1). This tool is not available commer-cially.6.2 Velvet BoardA board or pad, 6 by 12 in. (150 by 300mm), covered with black velvet or a black low-pile material.6.3 RulerA scale graduated in inches and 0.25-in. (5-mm)divisions or a metric scale graduat

21、ed in millimetres.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take at random the number of packages of wool from a lot asdirected in Table 1. Consider packages of wool as the primarysampling units.7.2 Laboratory SamplesConsider the packages of wool inthe lot sample as the laborat

22、ory sample.7.3 Test SpecimensFrom each package in the laboratorysample, take ten staples, with five staples being taken at equallyspaced intervals from each of two opposite sides of thepackage. Each staple should be about 0.25 in. (5 mm) indiameter. If larger, reduce the staple to the correct size b

23、ygently withdrawing the excess fibers from one side of thestaple. Take the staples as follows:7.3.1 Sampling by Tool:7.3.1.1 Depth of DrawGage the depth for inserting thesampling tool so that different levels of the package aresampled. For example, draw the first specimen from the centerof the packa

24、ge, the next about two thirds of the distance fromthe outside to the center, and the third specimen about one thirdthe distance from the outside to the center. Repeat this order atrandom locations along each side of the bag for drawing eachsuccessive test specimen.7.3.1.2 Taking a DrawInsert the poi

25、nt of the tool throughthe burlap covering of the package at random locations andthrust the shaft to the depth as described in 7.3.1.1. Pull the toolfrom the package, using a slight turning movement. Retain, asthe test specimen, that portion of the wool staple lodged in thehook of the sampling tool.7

26、.3.2 Sampling by HandCut a 2-in. (50-mm) opening inthe burlap covering the package at the point where the sampleis to be withdrawn. Withdraw a staple at random from theexposed wool with the fingers. Discard and replace the stapleif it appears to have been cut by opening the burlap.8. Conditioning8.1

27、 For tests made as directed in Section 9, specimens needbe neither preconditioned nor conditioned.9. Procedure9.1 Place the ruler lengthwise on the velvet board. Lay thestaple alongside the ruler, flattening and pressing the staple out5Donald D. Johnston, H. Dean Ray, and Elroy M. Pohle, “Staple Len

28、gthSampling Schedules for Raw Wool Packaged in Bags,” U.S. Dept. of AgricultureMarketing Service, No. 182, 1957, p. 15.in.mm183.03165.0146.03810.01213.033886.04102.0412114.0458118.024610.0FIG. 1 Wool Staple Sampling ToolD 12342straight in order to remove any crooks or bends. Do not stretchor elongat

29、e the staple by pulling or exerting pressure. With thestaple held in position by the pile of the fabric, carefully adjustthe position of the ruler so that the zero mark corresponds withthe base of the staple. Remove the hands and read the length ofthe staple to the nearest 0.25 in. (5 mm). When a st

30、aple doesnot have a clearly defined length, that is, a blunt end, but hasa tapered end or tip, determine the length at a point midwaybetween the base of the taper and the tip. Record the measure-ments obtained from successive staples by 0.25 in. on aclass-interval form as shown in Table 2.10. Calcul

31、ation10.1 Calculate the average staple length and the standarddeviation rounded to the nearest 0.1 in. (2 mm), and calculatethe coefficient of variation to the nearest 0.1 %. If the distri-bution of staple lengths is desired, calculate cumulative fre-quencies and construct a cumulative staple length

32、 frequencycurve. The worksheet illustrated in Table 2 is recommended forrecording and calculating the test data. Plot a cumulative staplelength frequency curve like that illustrated in Fig. 2. Plot thepoints using the first cumulative frequency and the correspond-ing upper limit for each class inter

33、val (100 % and 4.125 in. forthe first class interval in Table 2). Plot zero percent at the lowerlimit for the smallest class interval (1.375 in. for the data inTable 2).11. Report11.1 Report the following information:11.1.1 Conditions of Test:11.1.1.1 Identification of lot sampled,11.1.1.2 Number an

34、d type of packages in lot,11.1.1.3 Sampling procedure employed,11.1.1.4 Number of staples drawn, and11.1.1.5 Any deviations from standard method.11.1.2 Test Results:11.1.2.1 Average staple length rounded to the nearest 0.1in.,11.1.2.2 Standard deviation of the individual staple lengths,TABLE 1 Sampl

35、ing Schedule for Wool in PackagesNumber of Packagesin LotNumber of Packagesin Lot SampleLess than 10 all10 to 100 10101 to 200 15More than 200 20TABLE 2 Illustrative Form for Recording Test Data and Calculating the Average Staple Length of Wool, the Standard Deviation, and theCoefficient of Variatio

36、n(A similar form can be developed based upon metric units.)Staple Length AnalysisLot No .Sample Operator Date .Cumulative FrequenciesClass Intervals, in. Tally Frequency PercentFirst Cumula-tive, less thanSecond Cumula-tive, less than3.875 to 4.125 . 2 2 100 5883.625 to 3.875 . 6 6 98 4883.375 to 3.

37、625 . 10 10 92 3903.125 to 3.375 . 7 7 82 2982.875 to 3.125 . 18 18 75 2162.625 to 2.875 . 17 17 57 1412.375 to 2.625 . 15 15 40 842.125 to 2.375 . 14 14 25 441.875 to 2.125 . 6 6 11 191.625 to 1.875 . 2 2 5 81.375 to 1.625 . 3 3 3 3Totals . . n = 100 588 2279Divided by n . . . F1= 5.88 F2= 22.79B =

38、 Largest midpoint value = 4.00 in.m = Class interval = 0.25 in.X= Average staple length, in.S = Standard deviation, in.v = Coefficient of variationX= Bm(F1 1) = 4.00 0.25 (5.88 1) = 2.78S =m =2F22 F12 F12= 0.25 =222.79! 2 5.88 2 5.88!2= 0.57 in.V = 100s/X = (100)(0.57)/2.78 = 20.50 %.FIG. 2 Cumulati

39、ve Staple Length Frequency CurveD 1234311.1.2.3 Coefficient of variation of the individual staplelengths, and11.1.2.4 Cumulative frequency curve if desired.12. Precision and Bias12.1 PrecisionWhen measuring the minimum number oftest specimens called for in Table 1, the 95 % confidence limitswould be

40、 a minimum of 64 % of the mean staple length.512.2 BiasMethod D 1234 for testing the staple length ofgrease wool has no known bias and is generally used as areferee test method.13. Keywords13.1 length; sampling; statistics; woolThe American Society for Testing and Materials takes no position respect

41、ing the validity of any patent rights asserted in connectionwith any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any suchpatent rights, and the risk of infringement of such rights, are entirely their own responsibility.This stan

42、dard 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 Headquarte

43、rs. Your comments will receive careful consideration at a meeting of the responsibletechnical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards, at the address shown below.This standard

44、is copyrighted by ASTM, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above address or at610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website (www.astm.org).D 12344