ASTM_D_5650_-_97_2002.pdf

Designation:D 5650 97(Reapproved 2002)An American National StandardStandard Test Method forResistance to Bending of Paper of Low Bending Stiffness(Taber-Type Tester in 0 to 10 Taber Stiffness UnitConfiguration)1This standard is issued under the fixed designation D 5650;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a procedure used to measure theresistance to bending of papers which are of low grammage orhigh flexibility,or both,and which exhibit bending stiffness inthe range from 0 to 10 Taber stiffness units.1.2 The bending moment required to deflect the free end ofa 38-mm(1.5-in.)wide vertically clamped specimen 15 fromits center line when the load is applied 10 mm(0.39 in.)awayfrom the clamp is determined.The resistance to bending iscalculated from the bending moment.1.3 The instrument used in this test method is identical tothat described in Test Method D 5342,used in the modifiedconfiguration described in Section 9.1.4 Test results obtained using the Taber-Type tester asdescribed in this test method have been reported to be as muchas 40%different from those obtained using Test MethodD 5342,and this test method shall not be used where TestMethod D 5342 is specified.1.5 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.Referenced Documents2.1 ASTM Standards:D 585 Practice for Sampling and Accepting a Single Lot ofPaper,Paperboard,Fiberboard,or Related Products2D 685 Practice for Conditioning Paper and Paper Productsfor Testing2D 1968 Terminology Relating to Paper and Paper Products2D 5342 Test Method for Resistance to Bending of Paper andPaperboard(Taber-Type Tester in Basic Configuration)2E 122 Practice for Calculating Sample Size to Estimate,With a Specified Tolerable Error,the Average for Charac-teristic of a Lot or Process33.Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology D 1968 and the Dictionary of Paper.44.Summary of Test Method4.1 A test specimen of defined dimensions is bent through aspecified angle using a specific testing instrument.The result-ing bending moment is read from the instrument scale.4.2 The resistance to bending can be calculated from thebending moment.5.Significance and Use5.1 Bending resistance of paper relates to a number of enduse applications including wrapping,printing,copy machineperformance,high speed mechanical handling of documents,and other applications.6.Apparatus6.1 Description:6.1.1 The basic instrument that has been used for the testdescribed in this test method for nearly fifty years is a manuallyoperated(crank-driven)instrument.Over the years,variousimprovements in the basic instrument have been made forimproved ease of use or greater reproducibility of data,or both.These improvements include replacement of the manual(crank)drive system with a constant speed motor,addition ofautomatic data determination,and automated instrument(mo-tor sequencing)operation.Fig.1 shows the motor-drivenversion of the instrument(see 6.1.2).It is the motor-drivenmodel of the basic instrument that is the basis for this testmethod.However,any of the instrument variations describedin this section,when properly calibrated and operated,shouldyield the same result.The components of the basic instrumentcan be seen in Fig.1 as follows:6.1.1.1 A pendulum(A)supported in antifriction in bear-ings,carrying a vise(C)that has two clamping screws for1This test method is under the jurisdiction of ASTM Committee D06 on Paperand Paper Products and is the direct responsibility of Subcommittee D06.92 on TestMethods.Current edition approved Dec.10,1997.Published November 1998.Originallyapproved in 1995.Last previous edition approved in 1995 as D 565095.2Annual Book of ASTM Standards,Vol 15.09.3Annual Book of ASTM Standards,Vol 14.02.4Available from the Technical Association of the Pulp and Paper Industry,P.O.Box 105113,Atlanta,GA 30348.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.holding and centering the test specimen,the lower edge of thevise coinciding with the center of the pendulum bearing.Thependulum is balanced,and at its lower end is a stud(D)towhich weights may be attached and that loads the pendulum ata distance of 100 6 0.025 mm(3.94 in.)from its center;without added weights the loading is 10 6 0.001 g.A line(E)coinciding with the center line of the vise jaws and the weightstud(D),is engraved at the upper end of the pendulum.6.1.1.2 A vertical disk(F),driven on the same axis as thependulum by a drivi