1、BRITISH STANDARD BS EN 14410:2003 Self adhesive tapes Measurement of breaking strength and elongation at break The European Standard EN 14410:2003 has the status of a British Standard ICS 83.180 BS EN 14410:2003 This British Standard was published under the authority of the Standards Policy and Stra
2、tegy Committee on 14 May 2003 BSI 14 May 2003 ISBN 0 580 41819 7 National foreword This British Standard is the official English language version of EN 14410:2003. The UK participation in its preparation was entrusted by Technical Committee PKW/5, Primary and transport packaging, to Subcommittee PKW
3、/5/33, Tensional strapping, taping and accessories, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this
4、 document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a cont
5、ract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals f
6、or change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright date displayed in t
7、his document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN14410 March2003 ICS83.180 Englishversion SelfadhesivetapesMeasurementofbreakingstrengthand elongationatbreak RubansautoadhsifsMesuraged
8、elarsistancela ruptureetdelallongementlarupture KlebebnderMessungderBruchkraftundder Reidehnung ThisEuropeanStandardwasapprovedbyCENon6December2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwi
9、thoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityof
10、aCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain
11、Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN14410:2003EEN14410:
12、2003(E) 2 Contents page Foreword3 Introduction .4 1 Scope 5 2 Termsanddefinitions. .5 3 Significanceanduse .5 4 Principle5 5 Apparatus .6 6 Testsampleandtestpieces . 7 7 Procedure .7 8 Expressionofresults . .8 9 Testreport . .8EN14410:2003(E) 3 Foreword Thisdocument(EN14410:2003)hasbeenpreparedbyTec
13、hnicalCommitteeCEN/TC253“Selfadhesivetapes“, thesecretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbySeptember2003,andconflictingnationalstandardsshallbewithdrawnatthe latestbySeptember2003. Th
14、isdocumentsupersedesEN1940:1996andEN1941:1996. ThisEuropeanstandardhasbeenrevisedinconjunctionwithAFERA(AssociationofEuropeanselfAdhesive tapesManufacturers)inEuropeandPSTC(PressureSensitiveTapeCouncil)inUSAwiththepurposetoproduce astandardwhichwillbeacceptableinduecoursebyISO. AccordingtotheCEN/CEN
15、ELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,Switzerlanda
16、ndtheUnitedKingdom.EN14410:2003(E) 4 Introduction ThemethodspecifiedinthisEuropeanStandardcombinesthedeterminationofbreakingstrengthandelongation atbreakintoonemethodinplaceofthetwoseparatemethodsoriginallypublished,EN1940andEN1941.The actualtestmethodforbothisidentical,onlytheinterpretationoftheres
17、ultswasdifferent. MethodA:SelfadhesivetapesMeasurementofbreakingstrengthandelongationatbreakoftapesotherthan filamenttapes. MethodB:SelfadhesivetapesMeasurementofbreakingstrengthoffilamentreinforcedtapes.EN14410:2003(E) 5 1Scope ThisEuropeanStandardspecifiesmethodstomeasurethebreakingstrengthandelon
18、gationatbreakofaself adhesivetapewhenitissubjectedtoatensileforcesufficienttocauseittobreak. Thebreakingstrengthofadhesivetapeisofvalueasanindicationofitsuniformityandquality,anditsabilityto withstandstressesduringapplicationanduse. Theelongationatbreakoftheadhesivetapeisofvalueasanindicationofitsun
19、iformityandqualityaswellasa roughindicationofitsabilitytoconformtocurvedandirregularsurfaces.Itisusuallydeterminedatthesametime asthebreakingstrength. Thistestmethoddescribesaprocedurefortesting12mmor24mmwidesamplescutfromsuppliedrollsofself adhesivetapes.Alternativelyrollsofselfadhesivetapeupto50mm
20、widemaybedirectlytestedintheiroriginal width.Inthesecircumstancesthepracticalbreakingstrengthandelongationwillbetypicalofthemanufacturers cutedges.Whennewlycutsamplepiecesaretested,becauseofthebettercuttingoftheedges,theresultscanbe higherthanwouldbefoundoncommercialtape. 2 Termsanddefinitions Forth
21、epurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 2.1 breakingstrength abilitytoresistbreakingwhensubjecttoloadunderprescribedconditions 2.2 elongationatbreak increaseinlengthoftheadhesivetapeatthetimeofbreakingasapercentageoftheoriginallength 3 Significanceanduse Thesemethodspro
22、videameansofassessingtheuniformityofbreakingstrengthandelongationatbreakofa giventypeofpressuresensitivetapeandmaybeusedtocompareoneproductwithanother. Thetestmethodmaybeusedtodetermineparticularbackingmaterialsortapewidthsappropriatetoadesiredend use. Whenrelativestrengthisofinterest,thetestingshou
23、ldbeontapeinthewidthreceivedtoavoiddiscrepanciesas describedabove. NOTE1 Comparisonoftapesbydifferentproceduresshouldbeavoidedbecausetestparameterssuchastestpiece dimensionorjawspeeddeterminetheresult.Differentlevelswillproducedifferentresultsforthesametesttape.Itisusua lto findbreakingstrengthincre
24、asingsignificantlywithincreasingjawspeed. NOTE2 Elongationmeasurementsbecomedifficulttoperformonstretchymaterials(greaterthan200%elongationat break)whentheratiooftestpiecelengthtowidthissmall(approaching2).Theresultsshowhighvariabilityanddonotallo wfor practicaluseofthisinformationexceptwhenonewishe
25、stodemonstratelargedifferencesbetweenmaterials. 4Principle Themethodconsistsofholdingtheadhesivetapeverticallybythetwoclampsofatensiletestingmachine.A tensiletestiscarriedoutuntiltheadhesivetapebreaks.EN14410:2003(E) 6 MethodA:Astripoftapeismountedbetweentwoclampsalignedinastraightflatplaneandaforce
26、isappliedata specifiedrateuntilthetapebreaks. MethodB:Astripoffilamentreinforcedtapeisappliedtotwodrumsalignedinaflatplaneandaforceisappliedat aspecifiedrateuntilthetapebreaks. 5Apparatus 5.1 Tensiletestingmachine Aconstantrateofextension(CRE)tensiontestershallbeused.Thetestershallhavetwoclampswithc
27、entresin thesameplane,parallelwiththedirectionofthemotiononthestressingclampandsoalignedthattheywillhold thespecimenwhollyinthesameplane,ameansofmovingthestressingclampatauniformrateof 5mm/s0,2mm/sandadeviceforrecordingloadandclampdisplacement.Theinstrumentshallbecalibrated suchthatamaximumerrorof2%
28、isallowedonthereading. 5.2Clamps Preferablyofthepneumaticactiontype.Clampfacesshouldbeatleast50mmwideand38mmdeep.Thefaces shouldhavealightcrosshatchedserrationtominimisetheriskofslippage. NOTE1 Plasticmaterialsarereducedinwidthandthicknessastheystretch.Thiscausesthemtodrawdownoutofthe clamps.Pneumat
29、icclampsminimisethiseffect.Itcanbefurtherreducedbytheappropriatechoiceofsurfaceontheclamps. Thegreatestimprovement,bothwithrespecttotheabovementionedshrinkageproblemandsimpleslippage,maybefound fromtheuseofurethanefilmwhichcanbeobtainedasaselfadhesivetapeapproximately0,5mmthick.Thismaterialhasa very
30、highcoefficientoffriction,issomewhatmalleableandiseasilyreplaced.Alternativematerialsarecoatedabrasives,ru bber (orothersynthetictypes)orothertapes. NOTE2 Theuseofclampsfortestingreinforcedtapesisdiscouragedbecausethestrengthofreinforcedtapesrequires excessiveclampingpressurewhichcancausecrushingoft
31、hereinforcingfilaments.Whenthisoccurs,thetapeusuallybreaks atthejawedgewhichcanresultinlowerbreakingvalues.HencetheuseofcylindersdescribedinmethodBandin4.3belowis recommendedforreinforcedtapes. 5.3Cylinders UsedinplaceofclampsinmethodBforreinforcedtapes.Eachofthetwocylindersshallbeapproximately100mm
32、 indiameterandapproximately38mmwideheldinthepositionordinarilyoccupiedbytheclampssothatthetape, whenappliedtothecylindersandextendedbetweenthemfallsinthelineofstressotherwiseoccupiedbythetest piecewhenclampsareused.SeeFigure1. 5.4Scale Ascaleapproximately22mminlengthdividedinto2mmincrementsisattache
33、dtothesurfaceofeachcylinder. Thezeropointshallbeatthepointoftangencyofthetapewiththecylinderduringthetestandthescaleshall increaseupwardsonthelowercylinderanddownwardsontheuppercylinder. NOTE Thesescaleswillbeusedtoobserveandmeasurethetapeslippageduringthedeterminationofbreakingstrength ofreinforced
34、filamenttapes. 5.5 Cuttingtool Anappropriatetestpiececuttershallholdtwosingleedgerazorbladesinparallelplanesaprecisedistanceapart, toformacutterofexactspecimenwidth;twocutters,12mmand24mmcuttingwidth,shallbeavailableor appropriatealternateswhichwillnotcauseedgedamage.Theprecisionontherazorbladesepar
35、ationshallbethe nominalwidth 0,10mm. 5.6 Whenintendingtocharacterisethematerialfromwhichthetapeismade,thetestshouldbeperformedona specimencutfromwithinthesamplematerialboundariesusingasharprazorbladecutterasdefinedin4.5.EN14410:2003(E) 7 NOTE Someofthetraditionaltoolsfortestpiecepreparationshouldbea
36、voidedwhenthebackingiscomprisedofthin plasticsheeting.Theseincludechoppingdiesandsamplecuttersoperatingonashearingprinciple.Thereasonforthisrestrai nt isthatedgessufficientlyraggedanddamagedresultingfromshearingorchoppingcausetearingtooccurbeforethetruetensil e strengthlevelisreached.Tapeswithfibrou
37、sbackingsmaybecuttosatisfactorytestpieceswiththesetools. 6 Testsampleandtestpieces 6.1 Conditionthesamplerollsoftapeinthestandardconditionsof23C 1Cand50% 5%relative humidity(RH)Testattheseconditionsunlessotherwisespecified.Ifthesetolerancescannotbemaintained,the closestpossibletolerancesshallbeuseda
38、ndtheserevisedtolerancesquotedinthereport. 6.2 Discardatleastthreebutnomorethansixouterwrapsoftapefromthesamplerollbeforetakingthetest piecesfortesting 6.3 Takefromeachroll5testpieces.FormethodA,eachtestpieceshallbe200mmlongandnormallythe samewidthastheadhesivetape.FortestpiecesusedwithmethodB,eacht
39、estpieceshallbe700mmlong.For testpiecesusedwithmethodA,theendsthatwillbeintheclampsmaybecoveredwithalayerofpaperorbe foldedbackonthemselves(inthiscasethetestpiecewouldneedtobelonger). Thecoveringshallbewrinklefreesothatuniformpressureisexertedbytheclampsandleavetheentirearea exposedbetweentheclampsu
40、ncovered. FormethodB,thereinforcedtapetestpiecerequiresnofurtherpreparationotherthantohavetheappropriate dimensionsandtoensurethattheadhesiveisnotcontaminatedsothatitwilladheretothecylinders. 6.4 Unlesstherollistobetestedassupplied,atestpiece12mmor24mmwideshallbecutlongitudinallyfrom theroll.Testpie
41、ceswillnotnormallybenarrowerthan3mm. 7Procedure 7.1 Thetestshallbecarriedoutatthestandardconditionsof23C1Cand50%5%RH. 7.2 Removethetestpiecesradiallyfromtherollatanapproximatespeedof300mm/s. NOTE WhentestingeasilyextensibleselfadhesivetapessuchasthosebasedonplasticisedPVC,PE,etc.itis recommendedthat
42、thesamplepiecesbefurtherconditionedfor2htoremovestrainanddistortionduetounrolling. 7.3 MethodAfornonfilamenttapes Settheclamps100mmapart.Clampthetestpiecefirmlysothatthelongitudinalaxisisverticalandinlinewiththe directionoftheappliedforce.Applynomoretensionthetestpiecethanisnecessarytoremoveslack. S
43、tartthemachineintomotionat5mm/sandcheckthattheclampsmoveinthesameplaneandparalleltothe appliedforce. Rejectalltestpieceswhichbreakwithin5mmoftheclampsandcarryoutsufficientfurtherteststoobtain5test pieceswhichbreakinthecorrectmanner. Notethefinalloadatthebreakandthedistancebetweentheclampsatbreak.(Thismaybereporteddirec
