1、Designation: D6644 01 (Reapproved 2013)Standard Test Method forTension Strength of Sew-Through Flange Buttons1This standard is issued under the fixed designation D6644; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st 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 measures the resistance of the bridge ofa sew-through button to a steadily increasing strain.1.2 The va
3、lues 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 standa
4、rd.1.3 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. Reference
5、d Documents2.1 ASTM Standards:2D5497 Terminology Relating to Buttons (Withdrawn 2011)33. Terminology3.1 For button definitions, refer to Terminology D5497.4. Summary of Test Method4.1 The sew-through flange button is sewn onto fabric andpositioned in a clamping fixture. The combination is subjectedt
6、o a strain recorded on a force gauge.4.2 Tests are made on sew through flange buttons beforelaundering or dry cleaning with the option of testing again aftera predetermined number of launderings or dry cleanings.5. Significance and Use5.1 This test measures an important property to users of sewthrou
7、gh flange buttons. This is a means of determining theresistance of the bridge of the button to a strain which cancause it to fall off a garment to which it is attached.5.2 If there are differences of practical significance betweenthe reported test results for two laboratories (or more), com-parative
8、 tests should be performed to determine if there is astatistical bias between them, using competent statistical assis-tance. As a minimum, test samples should be used that are ashomogeneous as possible, that are drawn from the materialfrom which the disparate test results were obtained, and thatare
9、randomly assigned in equal numbers to each laboratory fortesting, Other materials with established test values may beused for this purpose. The test results for the two laboratoriesshould be compared using a statistical test for unpaired data, ata probability level chosen prior to the testing series
10、. If a bias isfound, either its cause must be found and corrected, or futuretest results must be adjusted in consideration of the knownbias.6. Apparatus6.1 Force GaugeOne capable of measuring 20 kg (44 lb)of tension or compression with an accuracy of 6 0.1 kg (60.22 lb). The gauge may be hand held o
11、r specially mounted.6.2 Testing MachineA constant rate of extension (CRE)Tester shall be used. The capacity of the machine must beselected for the break position on the gauge to fall within20-90 % of full scale.6.3 Jaw Clamping FixtureOne capable of firmly holdingthe button, such as a long nose lock
12、ing wrench or a 3-prongedclamping device.6.4 Commercial Sewing MachineOne capable of auto-matically sewing the button to. two or more layers of fabric.7. Sampling7.1 Laboratory SampleRandomly select quantity ofbuttons, approximately 100-200, from the same carton andfrom boxes within that carton that
13、 adequately represent thematerial from which test specimens may be chosen.7.2 Test SpecimensRandomly select 15-25 buttons fromthe laboratory sample for testing, if test specimens are submit-ted for preproduction approval, testing 15 buttons is accept-able.1This test method is under the jurisdiction
14、of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current edition approved Jan. 1, 2013. Published February 2013. Originallyapproved in 2001. Last previous edition approved in 2007 as D664401(2007).DOI: 10.1520/D6644-01R13.2For referenced ASTM
15、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.or
16、g.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Conditioning8.1 Condition the specimens as directed in practice D618using procedure E. Following conditioning prepare the speci-mens as instructed in 9.4 of Practice D618. Precondit
17、ioning isnot required.9. Specimen Preparation9.1 Sets, consisting of 5 buttons each, are prepared byattaching the. buttons, at least 12.7 cm (5 in.) apart, withfactory sewing equipment, to at least two layered production ordevelopment fabric processed to production finish.NOTE 1Suggested method is t
18、o use two layered cotton fabric, 12threads per button with a minimum pull strength of the fabric and threadof 15 lb.10. Procedure10.1 Select a set of buttons sewn onto fabric and positionthe clamping fixture underneath one of the buttons. Carefullyposition the attachment of he fixture so as not to a
19、ffect thestructural integrity of the button.10.2 Position the clamped fixture into the “L” shaped hookof the force gauge or upper clamp of the commercial tester.10.3 Place two ends of the fabric into the open jaws of thelower clamp with proper alignment10.4 Activate the tester or pull down on the fa
20、bric untilfailure.11. Report11.1 State that the specimens were tested as directed in TestMethod D6644.11.2 Report the following information.11.2.1 Force required to remove buttons from fabric (bridgeof button breaks).11.2.2 Report individual gauge readings and calculate aver-age.11.2.3 Report the fa
21、ilure mode (button failure, fabric failure,stitching failure).12. Precision and Bias12.1 PrecisionThe precision of this test has not beenestablished.12.2 BiasNo justifiable statement can be made on the biasof Test Method D6644 for Testing the Tension Strength of SewThrough Flange Buttons since the t
22、rue values cannot beestablished by an accepted referee method.13. Keywords13.1 bridge of button; button failureASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advise
23、d that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either re
24、approved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If y
25、ou feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individua
26、l reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 1 Pull Testing FixtureD6644 01 (2013)2
