ASTM D6644-2001(2013) 5000 Standard Test Method for Tension Strength of Sew-Through Flange Buttons《有眼镶边纽扣抗拉强度的标准试验方法》.pdf
《ASTM D6644-2001(2013) 5000 Standard Test Method for Tension Strength of Sew-Through Flange Buttons《有眼镶边纽扣抗拉强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6644-2001(2013) 5000 Standard Test Method for Tension Strength of Sew-Through Flange Buttons《有眼镶边纽扣抗拉强度的标准试验方法》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
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5、d Documents2.1 ASTM Standards:2D5497 Terminology Relating to Buttons (Withdrawn 2011)33.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
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