ASTM D1234-1985(2008) 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的标准试验方法》.pdf
《ASTM D1234-1985(2008) 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的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1234-1985(2008) 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的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 1234 85 (Reapproved 2008)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 () 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 inlength
3、, 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 determ
4、ination 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 wi
5、th 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:3D 123 Terminology Relating to TextilesD 519 Test Method for Length of
6、Fiber in Wool TopD 1575 Test Method for Fiber Length of Wool in ScouredWool and in Card SliverD 4271 Practice for Writing Statements on Sampling in TestMethods for Textiles3. 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 s
9、taples 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 w
10、oolsince the test 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 determi
11、ne if 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 questio
12、n. The 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
13、bias 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 lo
14、t of wool in order to assign length classes whendetermining the conformance of lots and shipments to lengthspecifications.1This 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
15、. 1, 2008. Published October 2008. Originallyapproved in 1950. Last previous edition approved in 2001 as D 1234 85 (2001).2Further information covering the procedures and techniques described in thistest method appears in D. D. Johnston, H. Dean Ray, W. J. Manning, and E. M.Pohle, “Relationships of
16、Staple Length in Grease Wool and Resultant Top,” TextileResearch Journal, Vol 21, October 1951, pp. 757762.3For 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 stand
17、ards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 exce
18、eding the above limits is divided into lotswithin the prescribed limits.5.4 The nature of the sampling procedure is such that greasewool staples as originally drawn from the wool of the lotrequire only a slight amount of preparation before measure-ment. The bulk and laboratory samples are synonymous
19、 in thistest method.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 tool or by hand.5.6 Practice D 4271 contains information on how to write asection on samp
20、ling in test methods.NOTE 2An extensive discussion of grease wool staple sampling canbe found in the literature.46. Apparatus6.1 Sampling ToolA spear-shaped tool with a hook orbarb at one end for use in extracting a small quantity of woolfrom within a bag (Fig. 1). This tool is not available commer-
21、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 graduated in millimetres.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take
22、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 laboratory sample.7.3 Test SpecimensFrom each package in the laboratorysample, take ten staple
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