ASTM_D_1575_-_13.pdf

Designation:D157513Standard Test Method forFiber Length of Wool in Scoured Wool and in Card Sliver1This standard is issued under the fixed designation D1575;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 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 estimation of the averagefiber length and length distribution of wool in nonparallelassemblies,such as scoured wool,and in card sliver.1.2 This test method is applicable to many fibers other thanwool if in the form of a nonparallel assembly or in a card sliver.1.3 This test method is not applicable to unscoured wool orto wool top.1.4 This test method specifically requires length in inchesand mass in metric units,and is not contrary to ASTM policy.The values stated in inch-pound units are to be regarded as thestandard.The information in parentheses is for informationonly.NOTE1The determination of staple length of grease wool is coveredin Method D1234,Sampling and Testing Staple Length of Grease Wool,2and the average length of fibers in wool top is covered in Test MethodD519.1.5 This standard does not purport to address the safetyconcerns,if any,associated with 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:2D123 Terminology Relating to TextilesD1234 Test Method of Sampling and Testing Staple Lengthof Grease WoolD519 Test Method for Length of Fiber in Wool TopD1776 Practice for Conditioning and Testing TextilesD4845 Terminology Relating to Wool3.Terminology3.1 For all terminology related to D13.13,Wool and Felt,refer to Terminology D4845.3.1.1 The following terms are relevant to this standard:carded wool,scoured wool,wool.3.2 For definitions of all other textile terms see TerminologyD123.4.Summary of Test Method4.1 The sample or test specimen is prepared for measure-ment by hand carding when necessary,manipulated on a combsorter,and separated into definite length increments.Theweight of the fibers in each length increment is obtained,andfrom these data estimates of the weight-biased average fiberlength and weight-biased length distribution are calculated.5.Significance and Use5.1 This test method is not recommended for acceptancetesting due to its poor between-laboratory precision.In somecases the purchaser and the seller may have to test a commer-cial shipment of one or more specific materials by the bestavailable method even though the method has not beenrecommended for acceptance testing of commercial shipments.In such a case,if there is a disagreement arising fromdifferences in values reported by the purchaser and the sellerwhen using this method for acceptance testing,the statisticalbias,if any,between the laboratory of the purchaser and thelaboratory of the seller should be determined with eachcomparison being based on testing specimens randomly drawnfrom one sample of material of the type being tested.5.2 A knowledge of the average length and length distribu-tion of fibers is important to fiber processors.This method isuseful for inplant control testing and for research purposes.6.Apparatus6.1 Comb Sorter,similar to that described in Section 6,ofTest Method D519,3but provided with the modificationsdiscussed in Note 2.NOTE2For specimens in which the longest fibers do not exceed 6 in.(150 mm),the test can be performed on one 15-in.(380-mm)sorter.Forspecimens in which the longest fibers exceed 6 in.,two sorters,8-in.(200-mm)or 15-in.,shall be used.When two sorters are used,noalteration is required.When one 15-in.sorter is used,the sorter shall be1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1,2013.Published August 2013.Originallyapproved in 1958.Last previous edition approved in 2008 as D1575 90(2008).DOI:10.1520/D1575-13.2For 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 onthe ASTM website.3Apparatus meeting these requirements is furnished by Alfred Suter Co.,PrellPlaza,Orangeburg,NY 10962.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 altered.As shown in Fig.1,an additional faller supporting rod shall beinserted from the rear of the sorter to support faller bars 9 through 15.Holding brackets for supporting two retaining bars at the rear of the sorterare required.One holding bracket,a suggested design of which is shownin Fig.2,shall be mounted on each side of the sorter frame over the spacesbetween