ASTM_D_1907_-_D_1907M_-_12_2018.pdf

Designation:D1907/D1907M12(Reapproved 2018)Standard 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 U.S.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/D578M,and D681.The linear density of short yarnsegments,raveled from fabrics,may be determined by Test MethodD1059.1.6 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD541 Specification for Single Jute Yarn(Withdrawn 1996)3D578/D578M 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 SpecimensD1578 Test Method for Breaking Strength of Yarn in SkeinForm1This 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 1,2018.Published July 2018.Originally approvedin 1961 T.Last previous edition approved in 2012 as D1907/D1907M 12.DOI:10.1520/D1907_D1907M-12R18.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 D1909 Standard