EN 646-2018.docx
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EN 646-2018.docx
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EUROPEANSTANDARD
EN646
NORMEEUROPEENNE
November2018
EUROPAISCHENORM
ICS67.250;85.060
SupersedesEN646:
2006
EnglishVersion
Paperandboardintendedtocomeintocontactwith
foodstuffs-Determinationofcolourfastnessofdyed
paperandboard
Papiersetcartonsdestinesaentrerencontact PapierundPappevorgesehenfiirden
aveclesdenreesalimentaires-Determinationdela KontaktmitLebensmitteln-Bestimmungder
soliditedelacouleurdespapiersetcartonscolores FarbechtheitvongefarbtemPapierundPappe
ThisEuropeanStandardwasapprovedbyCENon22July2018.
CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENmember.
ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.
CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,FormerYugoslavRepublicofMacedonia,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandUnitedKingdom.
EUROPEANCOMMITTEEFORSTANDARDIZATION
COMITEEUROPEENDENORMALISATION
EUROPAISCHESKOMITEEFURNORMUNG
©2018CEN
CEN-CENELECManagementCentre:
AvenueMarnix17,B-1000Brussels
AllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENnationalMembers
Contents Page
Europeanforeword iii
1Scope 4
2Normativereferences 4
3Termsanddefinitions 4
4Principle 4
5Materialsandequipment 4
5.7Kettle 5
6Reagents 5
7Sampling 5
8Preparationofsample 5
9Procedure 5
10Testconditions 6
11Evaluation 6
12Testreport 7
AnnexA(informative)Determinationofthefastnessoffluorescentwhitenedpaperandboardonlargesamples 8
Bibliography 9
Europeanforeword
Thisdocument(EN646:
2018)hasbeenpreparedbyTechnicalCommitteeCEN/TC172“Pulp,paperandboard”,thesecretariatofwhichisheldbyDIN.
ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyMay2019,andconflictingnationalstandardsshallbewithdrawnatthelatestbyMay2019.
Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.
ThisdocumentsupersedesEN646:
2006.
WithregardtoEN646:
2006thefollowingchangeshavebeenmade:
a)Clause1"Scope"hasbeenrevisedandextended;
b)inClause6"Reagents"thetestfluid"salivasimulant〃hasbeenremovedandthetestfluid'"alkalinesaltsolution“hasbeenintroduced;
c)newtestconditions,matchingtheuseofthetestedpapersandboardshavebeenincluded;
d)newdefinitionfortheglassfibrepapershasbeenincluded;
e)evaluationagainstagreyscaleonlyhasbeenincluded;
f)editorialchanges.
Attentionshallbedrawntothefactthattheglassfibrepapershavenotbeendulyvalidatedbeforethepublicationofthisstandard.
AccordingtotheCEN-CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:
Austria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,FormerYugoslavRepublicofMacedonia,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandtheUnitedKingdom.
1Scope
Thisdocumentdescribesproceduresforthetestingofdyedpaperandboardintendedtocomeintocontactwithfoodstuffs.Someproceduresdependingontheforeseeableuseofthematerialaregiven.
Visualevaluationagainstagreyscaleprovidesgradingofthebleeding.
Forsampleshavingsignificantdifferentsides,amigrationcanoccurfromoneglassfibretotheotherandcouldleadtowronginterpretationofthefastnessofoneside.Itisadvisabletocheckthesesamplesusinglargesamplingproceduretopreventcrosscontaminationoftheglassfibreduringthemigrationprocedure.TheprocedureisdescribedinAnnexA.Iflowerlimitofdetectionisrequired,thisprocedurecouldalsobeused.
2Normativereferences
Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.
EN20105-A03,Textiles-Testsforcolourfastness-PartA03:
Greyscaleforassessingstaining(ISO105-A03)
ENISO186,Paperandboard-Samplingtodetermineaveragequality(ISO186)
ENISO3696,Waterforanalyticallaboratoryuse-Specificationandtestmethods(ISO3696)
ISO6588-2,Paper,boardandpulps-DeterminationofpHofaqueousextracts-Part2:
Hotextraction
3Termsanddefinitions
Forthepurposesofthisdocument,thefollowingtermanddefinitionapplies.
ISOandIECmaintainterminologicaldatabasesforuseinstandardizationatthefollowingaddresses:
•IECElectropedia:
availableathttp:
〃www.electropedia.org/
•ISOOnlinebrowsingplatform:
availableathttp:
//www.iso.org/obp
1.1
colourfastness
lackoftransferofcolourfromapapertoanon-stainedglass-fibrepaper,saturatedwithatestfluidandevaluatedvisuallyforstainingagainstagreyscale
4Principle
Asampleisbroughtintocontactwithglassfibrepaperswhichhavebeensaturatedwithatestfluidandplacedunderloadforagiventimeandtemperature.Thestainingoftheglassfibrepaperisevaluatedagainstagreyscale.Thetestfluidsusedaredistilledordeionizedwater,dilutedaceticacid,alkalinesaltsolutionandoliveoildependingonthetypeofcontactexpected.
5Materialsandequipment
5.1UnstainedglassfibrepapersAsourceforexamplesofglassfibrepaperscanbeobtainedatDINStandardsCommitteePaper;boardand
)of60mmx90mm.Theglassfibrepapersshallmeetthefollowingconditions:
a)grammage70g/mpulps(NPa)[npa@din.de].http:
//www.din.de/en/getting-involved/standards-committees/cpa.
;
b)pH-value9,0to9,5,measuredinthehotwaterextractaccordingtoISO6588-2:
c)freefromfluorescentwhitenedandwetstrengthagents;
d)freefromcellulosicfibres.
5.2Glassplates,60mmx90mm.
5.3Polyethylenefilm,uncolouredandtransparent.
5.4Mass,1kg.
5.5GreyscaleinaccordancewithEN20105-A03.
5.6Dryingcupboard.
5.7Kettle.
6Reagents
6.1Distilledordeionizedwater,purityinaccordancetoENISO3696,grade3.
6.2Aqueousaceticacid,3,0%(m/v).
6.3Alkalinesaltsolution,seeTable1,compositionofthealkalinesaltwithapHof8,6±0,1,
Table1—Compositionofalkalinesaltsolution
Chemical
Massfraction
g/l
Sodiumhydrogencarbonate(NaHCOs)
4,2
Sodiumchloride(NaCl)
0,5
Potassiumcarbonate(K2cO3)
0,2
6.4Vegetableoil,thatshouldbeasdefinedinCommissionRegulation(EU)No10/2011.
7Sampling
IfalotistestedthensamplingiscarriedoutinaccordancewithENISO186.
8Preparationofsample
Cutorpunchseveraltestpiecesof50mmx20mmfromthesampleunderinvestigation.Smoothedgesshallbeobtained.
9Procedure
9.1IncaseoftestconditionsD,theglassplates(5.2).themass(5.4)andthevegetableoil(6.4)arestoredfor1hattestingtemperatureinadryingcupboard(5.6):
distilledordeionizedwater(6.1)isboiledinkettle(5.7).Theuseofcottonglovesissufficient.
9.2Immersetwosheetsofunstainedglassfibrepapers(52)inatestfluidC6.1,6.2,6.3or64).Removethesheetsaftersaturationandfreethesheetsfromexcessfluidbywipingontherimofthecontainer.
9.3Placeonesheetofunstainedglassfibrepaperwithitssmoothsideupwardsontheglassplate(5.2).Placethetestpiece(Clause8)immediatelyontheunstainedglassfibrepaper.Coveritwiththesecondsaturatedsheetofunstainedglassfibrepaper;sothatthesmoothsideoftheunstainedglassfibrepaperisincontactwiththetestpieceagain.Placeasecondglassplate(5.2)ontopofthesecondunstainedglassfibrepaperandforproceduresAandBwrapthetotalassemblyinpolyethylenefilm(5.3)topreventtheedgesfromdryingout,loaditwithamassof1kgf5.4)andallowittostandundertheconditionofTable2withprotectionagainstdirectlightpenetration.
9.4Iftestpiecesofagrammageof>140g/m2aretobeinvestigated,anappropriateevennumberofunstainedglassfibrepaperlayers(5.1)isusedsothatthetotaloftheirgrammagesjustexceedsthegrammageofthetestpiece.
9.5Afterthestoragetimeopentheassembly.Placetheunstainedglassfibrepaperson3adjacentglassrods,08mmto010mm,withthesidewhichwasincontactwiththetestpieceupwards,coverthemwithoutcontacttopreventlightpenetrationandair-dryatambienttemperature.Unstainedglassfibrepaperssaturatedwitholiveoilarenotdried.
10Testconditions
Table2describesthetestconditionsofEN646.
Table2—TestconditionsofEN646
ProceduresA-D
Simulationofthecontact
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