1、Designation:D3811/D3811M21aStandard 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
2、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 U.S.Department of Defense.1.Scope1.1 This test method covers one procedure for determiningt
3、he 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 anywa
4、y.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.
5、4 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 Tr
6、ade(TBT)Committee.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 Calcu
7、lating 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 CR
8、E(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.Th
9、e 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.
10、5.2 This procedure can be used to indicate satisfactionwhere a specification for unwind;either maximum,minimum,or mean;is established and when the responses referred to in5.1 are taken into consideration.6.Apparatus6.1 Unwind Force TesterA CRE tension tester shall beused.The tester shall have two cl
11、amps 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
12、.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,sized to fit snugly inside thesample tape core,with its axis horizontally supported in aframe that c
13、an 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
14、of Subcommittee D10.14 on Tape andLabels.Current edition approved Nov.1,2021.Published April 2022.Originallyapproved in 1979.Last previous edition approved in 2021 as D3811/D3811M 21.DOI:10.1520/D3811_D3811M-21A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Custom
15、er Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in a
16、ccordance 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.17.2 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 bet
