ASTM_D_6828_-_02_2019.pdf

Designation:D682802(Reapproved 2019)Standard Test Method forStiffness of Fabric by Blade/Slot Procedure1This standard is issued under the fixed designation D6828;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last 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 covers the determination of the stiff-ness of fabrics by measuring the force required to push aspecimen into a slot of predetermined width with a metal bladeworking at a predetermined capacity.NOTE1For other methods for testing stiffness,refer to Test MethodsD1388,D4032,and D5732.1.2 This test method is applicable to fabrics of any fibercontent whose stiffness does not exceed the capacity of thePenetrator Beam apparatus.Specimens can be taken fromfabrics,rolls,or end products.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1388 Test Method for Stiffness of FabricsD1776 Practice for Conditioning and Testing TextilesD2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)3D4032 Test Method for Stiffness of Fabric by the CircularBend ProcedureD4850 Terminology Relating to Fabrics and Fabric TestMethodsD5732 Test Method for Stiffness of Nonwoven FabricsUsing the Cantilever Test(Withdrawn 2008)32.2 Statistical Analysis Software:43.Terminology3.1 Definitions:3.1.1 For definitions of textile terms used in this methodrefer to Terminology D4850.For other terms used in thismethod,refer to Terminology D123.4.Summary of Test Method4.1 A swatch of fabric rests on two flat plate supportsseparated by a fixed distance.A force is applied to the fabricswatch midway between the supports by means of a bladeattached to a motor driven beam.The maximum force neededto push the fabric through the supports is measured as aresistance to bending of the fabric.5.Significance and Use5.1 This test method is considered satisfactory for qualitycontrol testing.5.2 If there are differences of practical significance betweenreported test results for two laboratories,comparative testsshould be performed to determine if there is a statistical biasbetween them,using competent statistical assistance.As aminimum,use test samples as homogeneous as possible,drawnfrom the material from which the disparate test results wereobtained,and randomly assigned in equal number to eachlaboratory for testing.The test results from the two laboratoriesshould be compared using a statistical test for unpaired data,at1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved July 1,2019.Published July 2019.Originally approvedin 2002.Last previous edition approved in 2015 as D6828 02(2015).DOI:10.1520/D6828-02R19.2For 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 referenced onwww.astm.org.4SAS Institute,Box 8000,Cary,NC 27511.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 a probability level chosen prior to the testing series.If a bias isfound,either its cause must be found and corrected,or futureresults for the source material must be adjusted in consider-ation of the known bias.5.3 The stiffness of fabric relates to its resistance to bendingwith further processing and use.It measures the fiber and yarnbendi