1、BRITISH STANDARD BS EN 311:2002 Wood-based panels Surface soundness Test method The European Standard EN 311:2002 has the status of a British Standard ICS 79.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 311:2002 This British Standard, having been prepared under
2、the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 27 May 2002 BSI 27 May 2002 ISBN 0 580 39783 1 National foreword This British Standard is the official English language versio
3、n of EN 311:2002. It supersedes BS EN 311:1992 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B/541, Wood-based panels, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary
4、. Cross-references The British Standards which implement international or European publications referred to in this 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
5、or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirer
6、s to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This documen
7、t comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUR
8、OPENNE EUROPISCHENORM EN311 May2002 ICS79.060.20 SupersedesEN311:1992 Englishversion WoodbasedpanelsSurfacesoundnessTestmethod PanneauxbasedeboisArrachementdelasurface Mthodedessai HolzwerkstoffeAbhebefestigkeitderOberflche Prfverfahren ThisEuropeanStandardwasapprovedbyCENon24February2002. CENmember
9、sareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember.
10、ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,
11、CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels
12、 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN311:2002EEN311:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Principle4 5 Apparatus .4 6 Testpieces. .5 6.1 Samplingandcutting 5 6.2 Preparingtheg
13、rooveinthetestpiece 5 6.2.1 Unfacedpanels .5 6.2.2 Overlaidpanels . .5 6.3 Conditioning.5 7 Procedure .5 7.1 Bondingthesteelpadtothesurface .5 7.2 Determinationofforceatfracture 6 8 Expressionofresults . .6 9 Testreport . .6EN311:2002(E) 3 Foreword ThisdocumentEN311:2002hasbeenpreparedbyTechnicalCom
14、mitteeCEN/TC112“Woodbasedpanels“,the secretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyNovember2002,andconflictingnationalstandardsshallbewithdrawnatthelatest byNovember2002. Thisdocumentsuper
15、sedesEN311:1992. ComparedtotheversionEN311:1992thefollowingmodificationshavebeenmade: a) Thescopehasbeenextended.Thestandardisnowalsoapplicabletooverlaidwoodbasedpanels,towetand dryprocessfibreboards,andcementbondedparticleboards. b) Thenumberoftestpieceshasbeenchangedfrom10to8. c) Thetestproceduref
16、orboardsthinnerthan15mmhasbeenmodified. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcoun triesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherland
17、s,Norway,Portugal,Spain,Swe den,SwitzerlandandtheUnitedKingdom.EN311:2002(E) 4 1Scope ThisEuropeanStandardspecifiesamethodofassessingthesurfacesoundnessofoverlaidwoodbasedpanels andunfacedparticleboards,wetanddryprocessfibreboardsandcementbondedparticleboards. NOTE Thegridpatternedfaceofwetprocessed
18、hardboardscannotbetestedaccordingtothisEuropeanStandard. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequen
19、tamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN3261, WoodbasedpanelsSampling,cuttingandinspectionPart1:Samplingandcuttingoftestpie
20、ces andexpressionoftestresults. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 surfacesoundness strengthorqualityofbondingbetweentheparticlesorfibresatthesurfaceofaboardandthelayerbelow(unfaced panels)orbetweenthecoatingmaterialandtheunderlyingbo
21、ard(overlaidpanels) 3.2 overlaidpanel panelsurfacedwithoneormoreoverlaysheetsorfilms,forexampleimpregnatedpaper,plastics,resinfilm,metal, decorativeveneer 4Principle Measurementofthetensileloadrequiredtopulloffadefinedsurfaceareaofoverlaidorunfacedpanel. 5Apparatus 5.1 Devicestoproduceagrooveasillus
22、tratedinFigure1withinthetolerancespecifiedin6.2. 5.2 Steelmushroomshapedpadwithadiameterof35,6 0,1mmandofasufficientthicknesstoprevent bendingduringthetest.AtypicalexampleisshowninFigure2. 5.3 Centringframewithsufficientstiffness,shapedtofitthemushroomshapedpadshowninFigure2.Anex ampleoftheframeissh
23、owninFigure3. 5.4 Tensiletestingmachinewithasufficientloadingcapacity,havinganaccuracyof1%oftheappliedload,and anadjustableloadingrate. 5.5 SteelgimbalasillustratedinFigure4.EN311:2002(E) 5 6 Testpieces 6.1 Samplingandcutting CarryoutthesamplingandcuttinginaccordancewithEN3261. 8testpieces,each50mm
24、50mm,shallbetakenfromeachboardtobetested. 6.2 Preparingthegrooveinthetestpiece 6.2.1Unfaced panels Acirculargrooveshallbecutintothesurfaceofthetestpieces(seeFigure1)bymeansofamillingtool(5.1). Onhalfofthetestpiecesthisgrooveshallbeononesurfaceoftheboardandontheotherhalfitshallbeonthe othersurface. T
25、hegrooveshallhaveaninsidediameterof35,7 0,2mm(enclosinganareaof1000mm 2 )andadepthof (0,3 0,1)mm. 6.2.2 Overlaidpanels Acirculargrooveshallbecutthroughthecoatingmaterialsothatitjustbreaksthroughintotheunderlyingboard. Thegrooveshallnotpenetratemorethan0,3mmintotheboard.Thegrooveshallhaveaninsidediam
26、eterof 35,7 0,2mm.Ifthepanelhasthesametypeofcoatingonbothsidesthenonhalfofthetestpiecesthegroove shallbeononesurfaceoftheboardandontheotherhalfitshallbeontheothersurface. Ifthepanelhasdifferenttypesofcoatingonitstwosurfacesthen8testpiecesforeachsurfaceshallbeused. 6.3Conditioning Alltestpiecesshallb
27、econditionedtoconstantmassinanatmospherewithapercentagerelativehumidityof (65 5)%andatemperatureof(20 2)Cpriortothebondingofthesteelmushroomshapedpad(5.2)tothe surface.Constantmassisconsideredtobereachedwhentheresultsoftwosuccessiveweighingoperations,car riedoutatanintervalof24h,donotdifferbymoretha
28、n0,1%ofthemassofthetestpiece. 7Procedure 7.1 Bondingthesteelpadtothesurface NOTE1 Thetypeofadhesiveused,thequantityused,andthemannerofapplicationcanallaffectthemeasuredstrengths. Ingeneraluseahotmeltadhesivewithameltingpointunder150C,spreadevenlyacrossthefaceoftheheated steelpad.Thecentringframeisus
29、edtopositionthepadexactlyonthetestpiece.Whilstinthecentringframethe hotpadshallbepressedontothesurfaceofthepieceandheldwithalightpressureof0,1N/mm 2 to0,2N/mm 2 untiltheadhesivehascooledandhardened. Ifthereisaweakeningeffecttothesurfacesoundnessfromtheheatingprocedurewithhotmelts(e.g.inthecase ofdry
30、processfibreboards(MDF)orsomekindsofoverlaidboards)acoldsettingepoxyadhesiveshallbeused insteadofthehotmelt. Iftheboardstobetestedarethinnerthan15 mmthetestpiecesshallbestrengthenedbybondinga 50mm 50mmsteelplateofatleast10mmthicknesstotheirunderside. NOTE2 Whentestingoverlaidboards,inordertoobtainan
31、efficientbondbetweenthesteelpadandthesurfacingmaterialit canbenecessarytopreparethesurfacebysandingorsolventcleaning.EN311:2002(E) 6 7.2 Determinationofforceatfracture Aftertheadhesivehascooledandhardened,thetestpieceshallbeplacedinthegimbal(5.5). Aforceshallbeappliedataconstantspeedsothatfailureocc
32、ursin(60 30)s. Recordtheforceatfailure. Forsurfacedboardsadditionallyrecordthefailuremode: withincoating; within glueline; betweensurfacematerialandunderlyingboard; withinunderlyingboard. Ifmixed,thepercentageofthedifferentfracturemodeshallberecorded. Theresultsfromtestpiecesthatfailwithinthegluelin
33、eofthepadshallberejected,unlessthespecificationvalueis lowerthanthetestresults. 8 Expressionofresults Thesurfacesoundness SSforeachtestpieceinNewtonspersquaremillimetreshallbecalculatedfromtheequa tion A F SS / = where F isthemaximumforceinNewtons; A isthesurfaceareagivenin6.2(1000mm 2 ). Expressthe
34、resulttothenearest0,01N/mm 2 . 9 Testreport AsdescribedinEN3261. Theresultsofeachsurfaceshallbecalculatedandreportedseparately,thesetwithlowermeangivingthevalueof theboardunlessitssurfacesareclearlymarked. Incaseofoverlaidpanelsreportalsothefailuremodeandifrelevantthepercentageofthedifferentfracture
35、 modes.EN311:2002(E) 7 Dimensionsinmillimetres Dimensionsinmillimetres Figure1Testpiece showingcirculargroove Figure2Exampleofasteel mushroomshapedpadEN311:2002(E) 8 Dimensionsinmillimetres Dimensionsinmillimetres Figure3Exampleofcentringframe Figure4GimbalmountedtensiletestingdeviceblankBS EN 311:2
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