ASTM_D_3513_-_02_2012.pdf

Designation:D351302(Reapproved 2012)Standard Test Method forOverlength Fiber Content of Manufactured Staple Fiber1This standard is issued under the fixed designation D3513;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 determination of the percentby number of overlength or multiple length fibers in a sampleof manufactured cut staple.The method is applicable to fibertaken immediately after manufacturing,from the bale,or frompartially processed stock.NOTE1For measurement of length and length distribution of manu-factured staple fibers,refer to Test Method D5103.1.2 This test method covers procedures using the Fibrosam-pler Model 335A(inch-pound units),the Fibrosampler Model335B(SI units),and Fibrosampler combs Model 336.1.2.1 The Fibrosampler Model 335A is equipped with asample plate that has 15.8-mm(58-in.)diameter sample holesand is recommended for use on blended staple taken from thefiber blender or from a carding machine.1.2.2 The Fibrosampler Model 335B is equipped with asample plate that has 10-mm(0.4-in.)diameter sample holesand is recommended for use on unblended staple as may betaken from the fiber cutter or from a bale of staple fiber.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as the standard.The values statedin each unit are not exact equivalents;therefore,each unit mustbe used independently of the other.1.4 This standard does not purport to address all of 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:2D123 Terminology Relating to TextilesD1447 Test Method for Length and Length Uniformity ofCotton Fibers by Photoelectric MeasurementD2258 Practice for Sampling Yarn for TestingD3333 Practice for Sampling Manufactured Staple Fibers,Sliver,or Tow for TestingD3888 Terminology for Yarn Spinning SystemsD3990 Terminology Relating to Fabric DefectsD4849 Terminology Related to Yarns and FibersD5103 Test Method for Length and Length Distribution ofManufactured Staple Fibers(Single-Fiber Test)3.Terminology3.1 Definitions:3.1.1 For definitions of textile terms used in this testmethod:fiber beard,staple,overlength staple fibers andmultiple-length staple fibers,refer to Terminology D4849.3.1.2 For definitions of other textile terms used in this testmethod,refer to Terminologies D123,D3888,D3990,andD4849.4.Summary of Test Method4.1 Fibers are caught randomly on a comb to form a fiberbeard.The probability that a given fiber length group repre-sented in the original fiber population will appear in the testspecimen is proportional to the ratio of the total length of thatfiber length group to the total fiber length of the originalsample.The beard is biased in the favor of long fibers.4.2 The fiber beard is brushed out and laid on a specimenboard.The density of the beard of the cut staple tapers to a linethat is parallel to the base of the comb.The overlength fibersare observed to extend beyond this line and they can beidentified easily.4.3 The noticeably longer fibers are pulled from the fiberbeard,verified for over-or multiple-length and counted.Theresult is then expressed as the percent overlength and percentmultiple-length fiber in the original population.5.Significance and Use5.1 The existence of overlength fiber in manufactured staplecan cause serious problems in the spinning of these fibers intoyarn.Overlength fibers may create problems in carding,butmore especially high-strength multiple cut fibers may causecockling in spinning.5.2 Since the overlength fibers are caused by dull ordamaged cutting knives or by uneven flow of tow to the staple1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1976.Last previous edition approved in 2002 as D3513 02(2007).DOI:10.1520/D3513-02R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 cutter,their existence within the fiber population is not uniformand their occurrence in the population follows a highly skeweddistribution.5.3 Manual methods of determining overlength fiber requiremuch more operator time,and the standard deviations of thetest between laboratories