1、Designation: D7506/D7506M 12Standard Test Method forPocket Reinforcement1This standard is issued under the fixed designation D7506/D7506M; 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 paren
2、theses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method utilizes the grab procedures to deter-mine localized weakness due to bar-tacking in the pocket areasof all types of garments. This ca
3、n be utilized to test bar-tackingin the pockets of shirts, as well as side or back pockets oftrousers, pants, or jeans.1.2 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, eachs
4、ystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.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 establ
5、ish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing
6、TextilesD5034 Test Method for Breaking Strength and Elongationof Textile Fabrics (Grab Test)3. Terminology3.1 Definitions: Definitions3.1.1 constant-rate-of-extension tensile testing machine(CRE), na testing machine in which the rate of increase ofspecimen length is uniform with time.3.1.2 grab test
7、, nin fabric testing, a tensile test in whichthe central part of the width of the specimen is gripped in theclamps.3.1.3 tensile test, nin textiles, a test in which a textilematerial is stretched in one direction to determine the loadelongation characteristics, in the breaking load, or the breakinge
8、longation.3.1.4 For definitions of other terms used in this test method,refer to Terminology D123.4. Summary of Test Method4.1 A specimen of the pocket area with the bar-tacking ismounted centrally in clamps of the tensile strength machineand a force is applied until the specimen breaks5. Apparatus5
9、.1 Constant-rate-of-extension (CRE) tensile testing ma-chine, as used in Test Method D5034, conforming to Specifi-cation D76.5.2 Clamps and jaws, rubber faced or other grippingsurfacejaw faces must measure 1.0 6 0.02 in. (25 6 1mm)wide at least 1 in. (25mm) , perpendicular to the direction ofthe for
10、ce, and not less than 25 nor more than 50 mm ( 1.0 normore than 2.0 in.). The back, or bottom, jaw face of each clampshall be at least as large as its mate. Use of a larger face for thesecond jaw reduces the problem of front and back jaw facemisalignment.6. Safety Precuations6.1 It is the users resp
11、onsibility to use safe and propertechniques when handling or using any of the equipmentmentioned.6.2 Good laboratory practice should be followed. Wearsafety glasses in all laboratory test rooms.1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibil
12、ity of Subcommittee D13.54 on Subassemblies.Current edition approved April 1, 2012. Published May 2012. Originallyapproved in 2009. Last previous edition approved in 2009 as D7506/D7506M-09.DOI: 10.1520/D7506_D7506M-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact A
13、STM 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, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Sampling, Test Specimens
14、, and Test Units7.1 Cut the garment or the side pockets as shown in Figs.1-4. If multiple samples are available, cut, if possible, aminimum of 3 specimens. If not, test an agreed upon numberof samples.8. Preparation of Apparatus8.1 Tensile Testing Machine:8.1.1 Prepare the machine according to the m
15、anufacturersinstructions.8.1.2 Set the distance between the clamps at 3.0 6 0.02 in.(75 6 1 mm) at the crosshead speed set at 12 in./min (305mm/min).8.1.3 Select the force range of the testing machine for thebreak to occur between 10% and 90% of the full- scale force.Calibrate or verify the testing
16、machine for this range.8.2 Clamping System:8.2.1 Check the jaw face surfaces for flatness and parallel-ism.8.2.2 Make a four-ply sandwich or white tissue paper, twosoft carbon papers placed back to back, and a second whitepaper (or fold the paper over the two carbons).8.2.3 Mount the papercarbon san
17、dwich and examine thejaw face imprint of uniformity of the carbon deposition on thetissue paper.8.2.4 If the imprint is incomplete or offsize, make appro-priate adjustments of the clamping gripping system and re-check the clamping system with a paper and carbon sandwich.NOTE 1Some sources of clampin
18、g irregularities are surface contact,metal surface, or jaw coating over surface, condition and pressureapplication.8.3 Verification of the Total Operating System:8.3.1 Verify the total operating system (loading, extension,clamping, and recording or data collection) by testing speci-mens of standard
19、fabrics for breaking force and compare to thedata with that given for the standard fabric. Prepare, test andcompare the data given from the tested fabric to the given dataknown for the standard test.9. Conditioning9.1 Condition garments for a minimum of 4 h prior totesting at 70 6 2F and 65% 6 2 RH.
20、 As outlined in PracticeD1776. Equilibrium is considered to have been reached whenthe mass of the specimen in successive weighing made atintervals of not less than 2 h does not exceed 0.1% of the massof the specimen.10. Procedure10.1 Patch pocket:10.1.1 Mount the area to be tested as shown in Fig. 5
21、 andFig. 6. The bar-tack area should be midway between top andbottom clamps and centered vertically. The bar-tack must alsobe perpendicular to the direction of force applied.FIG. 1 Cutting: Patch PocketFIG. 2 Cutting: Patch PocketFIG. 3 Cutting: Side PocketFIG. 4 Cutting: Side PocketD7506/D7506M 122
22、10.1.2 Activate the cross-head and record the ultimatebreaking strength.10.2 Side pocket:10.2.1 Mount the area to be tested as shown in Fig. 7 andFig. 8. The bar-tack area should be midway between top andbottom clamps and centered vertically. The bar-tack must alsobe perpendicular to the direction o
23、f force applied.11. Report11.1 Report tensile results of the area tested.11.2 Report the mode of failure; for example, seam failureor fabric failure or sewing thread failure.11.3 Report where the break occurs; at the jaw (jaw break)or at the pocket seam.12. Keywords12.1 breaking strength; pocket rei
24、nforcement; tensilestrengthFIG. 5 Mounting: Patch PocketFIG. 6 Pocket Stress Pulling Strength Patch PocketD7506/D7506M 123ASTM 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 expre
25、ssly advised 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
26、, either reapproved 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 a
27、ttend. If you 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
28、. 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 7 Mounting: Side PocketFIG. 8 Pocket Stress Pulling Strength Side PocketD7506/D7506M 124
