ASTM_D_5342_-_97_2007.pdf

Designation:D5342 97(Reapproved 2007)An American National StandardStandard Test Method forResistance to Bending of Paper and Paperboard(Taber-Type Tester in Basic Configuration)1This standard is issued under the fixed designation D5342;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 a procedure used to measure theresistance to bending of paper and paperboard.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 50 mm(1.97 in.)awayfrom the clamp is determined.The resistance to bending iscalculated from the bending moment.1.3 Some instruments of the type described in this testmethod(see Section 6)may be equipped with ultrasensitiveattachments or may be modified to accommodate shorterspecimen lengths than that specified in this test method(seeSection 9).1.4 Test Method D5650 describes a modification of theinstrument described in this test method for measurements inthe 0 to 10 Taber stiffness range only,and which requires asmaller test specimen.The modified procedure may be recom-mended for papers which are low in grammage or highlyflexible,or both.1.5 Test results obtained using modifications of the basicTaber-type instrument such as that described in Test MethodD5650 have been reported to be as much as 40%differentfrom those obtained using this test method,and such modifi-cations must not be used when this test method is specified.1.6 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:2D585 Practice for Sampling and Accepting a Single Lot ofPaper,Paperboard,Fiberboard,and Related ProductD685 Practice for Conditioning Paper and Paper Productsfor TestingD1968 Terminology Relating to Paper and Paper ProductsD5650 Test Method for Resistance to Bending of Paper ofLow Bending Stiffness(Taber-Type Tester in 0 to 10 TaberStiffness Unit Configuration)E122 Practice for Calculating Sample Size to Estimate,With Specified Precision,the Average for a Characteristicof a Lot or Process3.Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology D1968 and the Dictionary of Paper.34.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 ofend-use applications including wrapping,printing,copy ma-chine performance,high-speed mechanical handling of docu-ments,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-driven1This test method is under the jurisdiction of ASTM Committee D06 on Paperand Paper Products and is the direct responsibility of Subcommittee D06.92 onStandard Documents Relating to Paper and Paper Products.Current edition approved Dec.1,2007.Published December 2007.Originallyapproved in 1993.Last previous edition approved in 2002 as D5342 97(2002).DOI:10.1520/D5342-97R07.2For 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.3Available from Technical Association of the Pulp and Paper Industry(TAPPI),15 Technology Parkway South,Norcross,GA 30092,http:/www.tappi.org.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information.model 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 ba