ASTM_D_3811_-_D_3811M_-_96_2011.pdf

Designation:D3811/D3811M96(Reapproved 2011)Standard Test Method forUnwind Force of Pressure-Sensitive Tapes1This standard is issued under the fixed designation D3811/D3811M;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 parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers one procedure for determiningthe force required to unwind a roll of pressure-sensitive tape.1.2 The values stated in either SI or inch-pound units are tobe regarded separately as standard.The values stated in eachsystem may not be exact equivalents;therefore,each systemmust be used independently,without combining values in anyway.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.Referenced Documents2.1 ASTM Standards:2D996 Terminology of Packaging and Distribution Environ-mentsD3715/D3715M Practice for Quality Assurance of Pressure-Sensitive TapesD4332 Practice for Conditioning Containers,Packages,orPackaging Components for TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Process3.Terminology3.1 DefinitionsGeneral terms in this test method are de-fined in Terminology D996.4.Summary of Test Method4.1 The sample roll of tape is placed on a free-turningspindle held in a CRE(constant-rate-of-extension)tensiontester.While the crosshead is moved at a specified rate,themaximum force measured during unwinding of approximately150 mm 6 in.of tape is taken as the unwind force.5.Significance and Use5.1 This procedure simulates hand and machine unwindingof tape at low rates.The force required for unwinding at lowrates is a function of rate.At some rate(expected to be differentfor each construction type and manufacturer)there occurs aninversion of the response.The rate for this test method does notallow for comparisons of different tapes that will be unwoundat high rates.5.2 This procedure can be used to indicate satisfactionwhere a specification for unwind,either maximum or mini-mum,is established and when the responses referred to in 5.1are taken into consideration.6.Apparatus6.1 Unwind Force TesterA CRE tension tester shall beused.The tester shall have two clamps with centers in the sameplane,parallel with the direction of motion of the stressingclamp,and so aligned that they will hold the specimen whollyin the same plane;a means of moving the stressing clamp at auniform rate of 5 6 0.2 mm/s 12.0 6 0.5 in./min;and anautographic device for recording load.The instrument shall becalibrated to an accuracy of 0.5%full scale.The scale rangeused for any test shall be such that the mean test level fallswithin 20 to 50%of full scale.6.2 Free-Turning Spindle,3sized to fit snugly inside thesample tape core,with its axis horizontally supported in aframe that can be held in the clamp on the crosshead of theunwind tester that is not supporting the load cell.7.Sampling7.1 Acceptance SamplingSampling shall be in accordancewith Practice D3715/D3715M.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.14 on Tape andLabels.Current edition approved Aug.1,2011.Published November 2011.Originallyapproved in 1979.Last previous edition approved in 2006 as D3811/D3811M 96(2006).DOI:10.1520/D3811_D3811M-96R11.2For 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 sole source of supply of the apparatus known to the committee at this timeis Chemsultants International,9349 Hamilton Dr.,Mentor,OH 440611118.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.2 Sampling for Other PurposesThe sampling and num-ber of test specimens depends on the purpose of the testing.Practice E122 is recommended.It is common to test at leastfive specimens of a particular tape.Test specimens should betaken from several rolls of tape and wherever possible,amongseveral production runs of tape.Strong conclusions about aspecific property of a tape cannot be based on test results of asingle unit(roll)of a product.8.Test Specimens8.1 Specimens shall be t