ASTM_D_1907_-_D_1907M_-_12.pdf

Designation:D1907/D1907M12Standard Test Method forLinear Density of Yarn(Yarn Number)by the Skein Method1This standard is issued under the fixed designation D1907/D1907M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the determination of the lineardensity of all types of yarn in package form,subject to thelimitations of size and stretch given in 1.2 and 1.3.Provision ismade for expressing yarn linear density in all the traditionalyarn numbering systems.1.2 This test method is applicable to yarns that stretch lessthan 5%when tension on the yarn is increased from 0.25 to0.75 cN/tex 0.25 to 0.75 gf/tex.By mutual agreement,anduse of a lower than specified reeling tension,this method mayalso be adapted to measure the linear density of yarns thatstretch more than 5%,under the above force.1.3 This method is applicable to yarns finer than 2000 tex.However,it may be also adapted to coarser yarns by the use ofskeins of shorter than specified lengths,and alternate reelingconditions,agreeable to the interested parties.1.4 Depending on the procedure used to calculate themoisture content of the yarn being tested,and its actualmoisture content,or finish content,or both,one or more of thefollowing options may be utilized.1.4.1 Unscoured Yarn:Option 1Yarn at equilibrium withthe standard atmosphere for testing textiles.Option 2Oven-dried yarn.Option 3Oven-dried yarn,plus commercial moisture re-gain.1.4.2 Scoured Yarn:Option 4Scoured yarn at equilibriumwith the standard atmosphere for testing textiles.Option 5Oven-dried,scoured yarn.Option 6Oven-dried,scoured yarn,plus commercial mois-ture regain.Option 7Oven-dried,scoured yarn,plus commercial al-lowance(commercial moisture regain,plus an allowance forfinish).1.5 Specimens used to determine yarn linear density mayalso be used to determine the skein breaking strength of theyarn.Hence,this method provides the sequence of steps to befollowed,to determine both these yarn properties.NOTE1The linear density of yarns produced with jute,or glass,mayalso be determined by the following approved methods:SpecificationsD541,D578,and D681.The linear density of short yarn segments,raveledfrom fabrics,may be determined by Test Method D1059.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 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 TextilesD541 Specification for Single Jute Yarn(Withdrawn 1996)3D578 Specification for Glass Fiber StrandsD681 Specification for Jute Rove and Plied Yarn for Elec-trical and Packing Purposes(Withdrawn 2000)3D1059 Test Method for Yarn Number Based on Short-Length Specimens(Withdrawn 2010)3D1578 Test Method for Breaking Strength of Yarn in SkeinFormD1909 Standard Table of Commercial Moisture Regains forTextile FibersD2257 Test Method for Extractable Matter in TextilesD2258 Practice for Sampling Yarn for TestingD2494 Test Method for Commercial Mass of a Shipment ofYarn or Manufactured Staple Fiber or TowD4849 Terminology Related to Yarns and Fibers1This 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 1961 T.Last previous edition approved in 2007 as D1907 07.DOI:10.1520/D1907_D1907M-12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:commercial allowance,commercial moisture regain,directyarn numbering system,indirect yarn numbering system,lineardensity for fiber and yarn,skein,yarn number,yarn numberingsystem.3.2 For all other terminology,refer to Terminolo