1、Designation: D 6644 01 (Reapproved 2007)Standard Test Method forTension Strength of Sew-Through Flange Buttons1This standard is issued under the fixed designation D 6644; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 values stated in either SI units or inch-pound unitsare to be regarded separately as the standard. Within the text,the inch-pound units are shown in parentheses. The valuesstated in each system are not exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalue
4、s from the two systems may result in nonconformancewith the practice.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
5、applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 5497 Terminology Relating to Buttons3. Terminology3.1 For button definitions, refer to Terminology D 5497.4. Summary of Test Method4.1 The sew-through flange button is sewn onto fabric andpositioned in
6、 a clamping fixture. The combination is subjectedto 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 m
7、easures an important property to users of sewthrough 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 re
8、sults for two laboratories (or more), com-parative 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
9、disparate test results were obtained, and thatare 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 pr
10、obability level chosen prior to the testing series. 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 lbs)of tension or compression with an accuracy o
11、f 6 0.1 kg (60.22 lbs). The gauge may be hand held or 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 o
12、f firmly holdingthe button, such as a long nose locking 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 of but-tons, approximately 100-200, from
13、 the same carton and fromboxes within that carton that adequately represent the materialfrom 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 ac
14、cept-able.1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 2001. Last previous edition approved in 2002 as D 664401
15、(2002).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.1Copyright ASTM International, 100 Barr Harbor Drive,
16、PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Conditioning8.1 Condition the specimens as directed in practice D 618using procedure E. Following conditioning prepare the speci-mens as instructed in 9.4 of practice D 618. Preconditioning isnot required.9. Specimen Preparation9.1 Sets
17、, 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 to use two layered cotton fabric, 12threads per button
18、 with a minimum pull strength of the fabric and threadof 15 lbs.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 affect thestructural integrity of the button.10.2 Pos
19、ition 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 fabric untilfailure.11. Report11.1 State that the spec
20、imens were tested as directed in TestMethod D 6644.11.2 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 failure mode (button failure, fabric failure,stitchin
21、g 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 D 6644 for Testing the Tension Strength of SewThrough Flange Buttons since the true values cannot beestablished by an accepted ref
22、eree 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 advised that determination of the validity of any such p
23、atent 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 reapproved or withdrawn. Your comments are invited e
24、ither 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 you feel that your comments have not received a fai
25、r 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. Individual 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).FIG. 1 Pull Testing FixtureD 6644 01 (2007)2
