拉链纵向剪切强度的测定

standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember.

versions.

EUROPEANSTANDARD

NORMEEUROPEENNE

EUROPAISCHENORM

EN13780

February2003

ICS61.040

Englishversion

Touchandclosefasteners-Determinationoflongitudinalshearstrength

resistanceälatractionlongitudinale

Fermeturesauto-agrippantes-Determinationdela

Haftverschlüsse-BestimmungderLāngsscherfestigkeit

ThisEuropeanStandardwasapprovedbyCENon12December2002.

Standardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnational

CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropean

undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusastheofficial

ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytranslation

Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUnited

CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,

Kingdom.

EUROPEANCOMMITTEEFORSTANDARDIZATION

COMITEEUROPEENDENORMALISATION

EUROPAISCHESKOMITEEFURNORMUNG

ManagementCentre:ruedeStassart,36B-1050Brussels

◎2003CENAllrightsofexploitationinanyformandbyanymeansreserved

worldwideforCENnationalMembers.

Ref.No.EN13780:2003E

EN13780:2003(E)

2

Contents

page

Foreword

3

1Scope

4

2Normativereferences

4

3Termsanddefinitions

4

4Principle

4

5Apparatus

4

6Testspecimens

5

7Conditioning

5

8Procedure

6

9Calculationandexpressionofresults

7

10Testreport

8

EN13780:2003(E)

3

Foreword

Thisdocument(EN13780:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC248"Textilesandtextileproducts",thesecretariatofwhichisheldbyBSI.

ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyAugust2003,andconflictingnationalstandardsshallbewithdrawnatthelatestbyAugust2003.

AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.

EN13780:2003(E)

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1Scope

ThisEuropeanStandardspecifiesamethodfordeterminingthelongitudinalshearstrengthofatouchandclosefastener.

2Normativereferences

ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthepublicationreferredtoapplies(includingamendments).

EN12240,Touchandclosefasteners-Determinationoftheoverallandeffectivewidthsoftapesandtheeffectivewidthofaclosure.

EN20139,Textiles-Standardatmospheresforconditioningandtesting(ISO139:1973).

ENISO7500-1,Metallicmaterials-Verificationofstaticuniaxialtestingmachines-Part1:Tension/compressiontestingmachines(ISO7500-1:1999).

3Termsanddefinitions

ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply:

3.1

longitudinalshearstrength

maximumforceperuniteffectivearearequiredtoseparatethetwotapesformingthespecifiedclosureinashearingactionunderthespecifiedconditionsoftest

3.2

effectiveareaofaclosure

effectiveareaofaclosureistheproductoftheeffectivewidthofaclosureandthelengthofaclosure

4Principle

Matedcomponenttapesofatouchandclosefastenerareseparatedataconstantratesuchthattheseparationoccursprogressivelyalongtheclosureinadirectionparalleltothelengthofthetapesformingtheclosureandintheplaneoftheclosure.

5Apparatus

5.1Constantrateofextensiontensiletestingmachine,asspecifiedinENISO7500-1,connectedtoacomputer,viaasuitableinterface,capableofrecordingdataatarateofatleast20pointspersecond.

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EN13780:2003(E)

5.2Metalroller,madeofphosphor-bronze,withadiameterof(100±2)mm(seeFigure2),whichshallbeselectedinaccordancewithTable1.

Table1—Selectionofmetalroller

EffectivewidthofclosureWasdeterminedbyEN12240

mm

Metalrollermass

kg

W≤12,0

1,0±0,1

12,0<W≤25,0

2,5±0,1

25,0<W≤52,0

5,0±0,1

W>52,0

10,0±0,1

NOTEThemostimportantparametersfortherollerareitsdiameterandmass.Itswidthshouldbechoseninaccordance

withthespecificdensityofthephosphor-bronzeusedinitsmanufacture.

5.3Setofforkswithahandle(seeFigure3)whichengagesthemetalroller(5.2)andallowstherollertobemovedwithoutanyextradownforcebeingapplied(seeFigure4).

6Testspecimens

Cut4testspecimensofbothmaleandfemalecomponentsatleast100mmlongandmarkeachwithan"X"atoneendanda"Y"attheotherend,suchthateachtestspecimenofliketapeismarkedidentically.

7Conditioning

Conditionthetestspecimensforaminimumof24hinaccordancewiththestandardtemperateatmospherefortestingasspecifiedinEN20139.Theclosingofthetestspecimensandthetestingofthetouchandclosefastenersshallalsotakeplaceundertheseconditions.

6

EN13780:2003(E)

8Procedure

8.1Combinationsofclosure

Make4closuresintotal,1closureeachbeingmadeasperthecombinationsshowninFigure1.

1

2

3

Key

1CombinationA3CombinationC

2CombinationB4CombinationD

Figure1—Longitudinalshearstrengthcombinationsofclosure

8.2Methodofclosure

Selectthelengthofoverlapinaccordancewiththefollowingtable:

50mmforfastenersystemscomprisedofwovenhooktapeandwovenlooptape;

20mmforfastenersystemscomprisedofeitherwovenorknittedmushroomtapeandknittedlooptape;

20mmforfastenersystemscomprisedofaplasticmaletapeandknittedlooptape;

50mmforfastenersystemsnotlistedhereabove,butintheeventthattensilefailureoccurstoeitherofthetapesduringtesting,theoverlapshouldbereducedto20mm.

Makeeachclosureasfollows:

Placethemaletapeonaflatsurfacewiththepileuppermostandthenplacethefemaletapeontopwiththepilefacingdownwardssothatonlytheselectedlengthofoverlaptogetherwiththeoverallwidthmakeaclosure,usingminimalhandpressure.

Traversethemetalroller(5.2)atarateofapproximately200mm/salongthetapesinonedirection,thenimmediatelytraverseintheoppositedirection,thenturnthematingtapesover.

Repeattheprocedureuntiltherollerhastraversedthematingtapes5timesineachdirectioni.e.atotalof10times.

Takecarethatthecentreofgravityoftherollerdoesnotdeviatefromthecentrelineofthetapesduringthisoperation.

Takecarethattherollercoverstheentirewidthofthematingtapes.

NOTEThetapesareturnedovertominimisecurvature.

EN13780:2003(E)

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8.3Conductthetestforeachclosure

Setupthetensiletestingmachine(5.1)suchthatthejawsare100mmapart.

Mountthecombinedtestspecimenintothejawsofthetensiletestingmachine(5.1)suchthatthefreeendofthefemaletapeisintheupperjawandthefreeendofthemaletapeisinthelowerjaw,takingcaretoalignthetestspecimeninorderthattheforceappliedisuniformlydistributedacrossthewidthoftheclosure.

Setthetensilemachineinmotionataconstantrateofjawseparationof(100±10)mm/min.Recordforceagainstjawseparation,untileithertheclosurehasbeenseparatedoroneofthetapeshasundergonetensilefailure.Recordthemodeoffailure.

9Calculationandexpressionofresults

9.1Intheeventthatatensilefailureoccurs,thenthebreakingforceshallbeconsideredastheforcerequiredtosheartheclosure.

9.2Calculatetheeffectiveareaofclosure,bymultiplyingtheeffectivewidthoftheclosurebythelengthoftheoverlapandexpresstheresultinsquarecentimetres.

(1)

9.3Foreachcombinationcalculatethelongitudinalshearstrengthbydividingthemaximumforcerequiredtosheartheclosurebytheeffectiveareaoftheclosureandexpresstheresultinnewtonspersquarecentimetre.

(2)

9.4Calculatethemeanlongitudinalshearstrengthoftheclosurebycalculatingthearithmeticmeanofthelongitudinalshearstrengthsofthe4combinations.

Notestotheabovecalculations:

We=effectivewidthoftheclosure(mm)

Lo=lengthofoverlap(mm)

A=effectiveareaoftheclosure(cm²)

Fj=individualforcerequiredtoshearaclosure(N)

Sj=individuallongitudinalsh