1、Designation:D534499(Reapproved 2011)Standard Test Method forExtension Force of Partially Oriented Yarn1This standard is issued under the fixed designation D5344;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.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 measurement of extensionforce developed while drawing a partially oriented filamentyarn between pairs of dr
3、aw rolls of different surface speeds.1.2 Extension force provides an estimate of the yarn orien-tation.1.3 This test method applies to partially oriented filamentyarns less than 33.3 tex(300 denier),but it can be used forhigher deniers by applying the test conditions as directed inAppendix X1.1.4 Th
4、e values stated in SI units are to be regarded asstandard.The values given in parentheses are provided forinformation only.1.5 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-pr
5、iate 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 TextilesD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD2904 Practice for I
6、nterlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)33.Terminology3.1 Definitions:3.1.1 draw ratio(DR),nthe relation of the final length perunit mass to original length
7、per unit mass of a materialresulting from drawing.3.1.2 draw texturing,nfor processing thermoplasticfibers,the simultaneous or sequential process of drawing andimparting crimp,thus producing increased molecular orienta-tion and increased bulk.3.1.2.1 DiscussionThe drawing and texturing stages mayocc
8、ur in separate,usually consecutive,zones of a machine(sequential draw texturing)or together in the same zone(simultaneous draw texturing).3.1.3 drawing,nin textile processing,the process ofstretching or attenuating a material to increase the length perunit mass.3.1.3.1 DiscussionThis process orients
9、 the molecularchains in the length direction of partially oriented yarn.3.1.4 extension,nthe change in length of a material due tostretching.3.1.5 extension force,nthe force required to stretch amaterial to a given length.3.1.6 partially oriented yarn,nfilament yarn in whichpolymer molecules are onl
10、y partially aligned.3.1.6.1 DiscussionAdditional drawing of partially ori-ented yarn results in full orientation of the polymer moleculesand optimizes the tensile properties of the yarn.3.2 For definitions of other textile terms used in this testmethod refer to Terminology D123.4.Summary of Test Met
11、hod4.1 Partially oriented filament yarn withdrawn from a pack-age is pretensioned,heated,and drawn on an instrument underconditions similar to those used in the draw-texturing process.Atension measuring head senses the force required to draw therunning yarn a specified amount of its original length
12、undergiven conditions.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments because current esti-mates of between-laboratory precision are acceptable and themethod is used extensively in the trade for acceptance testing.1This test metho
13、d is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved Dec.1,2011.Published January 2012.Originallyapproved in 1993.Last previous edition approved in 2005 as D534499(2005).DOI:10.1520/D5344-99R1
14、1.2For 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 refere
15、nced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.1 If there are differences or practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine i
16、f there isa statistical bias between them,using competent statisticalassistance.As a minimum,the test samples to be used are ashomogeneous as possible,are drawn from the material fromwhich the disparate test results are obtained,and are assignedrandomly in equal numbers to each laboratory for testing.Other materials with established test values may be used forthis purpose.The test results from the two laboratories shouldbe compared using a statistical test for unpaired data,at aprobability level
