BS EN 14278-3-2004 Textiles - Determination of cotton fibres stickiness - Method using an automatic thermodetection rotating drum device《纺织品 棉纤维粘性的测定 使用自动测温旋转筒式装置的方法》.pdf

1、BRITISH STANDARD BS EN 14278-3:2004 Textiles Determination of cotton fibre stickiness Part 3: Method using an automatic thermodetection rotating drum device The European Standard EN 14278-3:2004 has the status of a British Standard ICS 59.060.10 BS EN 14278-3:2004 This British Standard was published

2、 under the authority of the Standards Policy and Strategy Committee on 2 April 2004 BSI 2 April 2004 ISBN 0 580 43599 7 National foreword This British Standard is the official English language version of EN 14278-3:2004. The UK participation in its preparation was entrusted to Technical Committee TC

3、I/24, Textiles physical testing, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found

4、 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 contract. Users are respon

5、sible 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 for change, and keep th

6、e 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 10, an inside back cover and a back cover. The BSI copyright notice displayed i

7、n this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN142783 March2004 ICS59.060.10 Englishversion TextilesDeterminationofcottonfibrestickinessPart3: Methodusinganautomaticthermodetectio

8、nrotatingdrum device TextilesDterminationducollagedesfibresdecoton Partie3:Mthodeutilisantundispositifautomatiquede thermodtectiontambourrotatif TextilienBewertungderKlebrigkeitvonBaumwolleTeil 3:VerfahrenmitdemautomatischenRotations Thermodetektionsgert ThisEuropeanStandardwasapprovedbyCENon24Decem

9、ber2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretari

10、atortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbo

11、diesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPEND

12、ENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN142783:2004:EEN142783:2004(E) 2 Contents page Foreword. 3 Introduction 4 1 Scope . 5 2 Normativereferences

13、. 5 3 Termsanddefinitions. 5 4 Principle. 5 5 Apparatus 6 6 Atmosphereforconditioningandtesting . . 7 7 Preparationoftestspecimens. 7 8 Procedure 7 9 Calculationandexpressionofresults. . 8 10 Testreport . 9 AnnexA (informative) Statisticalinformation . 10EN142783:2004(E) 3 Foreword Thisdocument(EN14

14、2783:2004)hasbeenpreparedbyTechnicalCommitteeCEN/TC248“Textilesand textileproducts”,thesecretariatofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbySeptember2004,andconflictingnationalstandardsshallbe wi

15、thdrawnatthelatestbySeptember2004. AnnexAisinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Cyprus,CzechRepublic, Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ir

16、eland,Italy,Latvia,Lithuania, Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Slovakia,Slovenia,Spain,Sweden,Switzerland andUnitedKingdom.EN142783:2004(E) 4 Introduction TheaimofthisEuropeanStandardistoprovideanindicationofthestickinesspotentialofasampleofcotton fibresbysimulatingthetendencyof“c

17、ontaminated“cottontosticktoworkingsurfaceduringthespinning process.Thistestmethoddoesnotdistinguishbetweenthevarioustypesofcontaminationwhichmaycause stickiness. Resultsofthismethodarenotdirectlyrelatedtothedeterminationofsugarcontent. Thisstandardconsistsofthefollowingmethods,underthegeneraltitle“T

18、extilesDeterminationofcotton fibrestickiness“: Part1:Methodusingamanualthermodetectiondevice Part2:Methodusinganautomaticthermodetectionplatedevice Part3:MethodusinganautomaticthermodetectionrotatingdrumdeviceEN142783:2004(E) 5 1Scope ThisEuropeanStandarddescribesanautomatictechniquetosimulatetheten

19、dencyof“contaminated“cotton fibrestosticktoworkingsurfacesoftextilemachines(e.g.cardclothing,draftingrollers,crushrolls). Testspecimenscanberawcottonfibre(fibresampled,e.g.fromabale),oropenedfibre,slivers. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfrom

20、otherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe lates

21、teditionofthepublicationreferredtoapplies(includingamendments). EN20139 TextilesStandardatmospheresforconditioningandtesting(ISO139:1973). 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 stickinesslevel numberofstickypointsindicatingtheseverityofc

22、ottonfibrestickiness 3.2 stickypoints entanglementoffibresorindividualfibresthatareattachedtoaworkingsurfaceasaresultofcontamination ofthecottonbystickysubstance 3.3 thermodetection actionofrevealingstickypointsthroughthecombinedapplicationofheatandpressure 3.4 cottonweb thinhomogeneouscottonfibrewe

23、bformedbyaspecialmicrocardopeningdevice 3.5 remover devicetotakeawaythenonstickingfibresandthecottonwebfromtherotatingdrum 4Principle Aweighedspecimenofcottonfibresisformedbyhandintoashortsliveranddeliveredbyaconveyertoa microcard,whereitisopenedintoafinewebandfedandpressedbetweentworotatingdrumsmai

24、ntainedat adefinedtemperature.Thewebisaspiratedfromthedrums,togetherwithallloosefibres,leavinganysticky pointsexposedonthedrumsurfaces.Thestickypointsaredetected,measuredandcountedbyalaserbased opticalsystem.EN142783:2004(E) 6 5Apparatus 5.1Automaticsystem 5.1.1 General Theautomaticsystemcomprisesac

25、onveyorbelttofeedatestspecimenintothesystem,followedbyaseries ofdevicesthatpreparethecottonweb,generatethestickypoints,regulateandcleantheequipment,and detectthestickypoints. Thesequenceofthedevicesintheautomaticsystemisasfollows. 5.1.2 Microcarddeviceforthepreparationofthecottonweb Microcarddeviceh

26、asthefunctionofformingthecottonwebfromthetestspecimen. Itsmajorworkingpartsarealikerinroller,amaincylinder,threeworkerrollers,adoffingrollerandatakeoff roller.Themaincylinderandtherollersareeachcoveredwithstandardmetalliccardwireofatypeand densityappropriatefortherespectiveindividualrollerfunctions.

27、 Thedimensionsandrelativespeedsofthemicrocardrollersaresuchastodeliveracottonwebwithamass perunitareaof(4,0 0,2)g/m. Therelativespeedsandtheclothingofthemicrocardrollersaresuchastoensurecompletetakeoffofthe web,withnocontaminationoftherollers. 5.1.3 Rotatingdrumdevice Thedevicecomprisesapairofsmooth

28、hardenedsteeldrums,rotatingagainsteachotheratarotationspeed of(100 10)min 1 .Thecottonwebisfedundergravitytothetwodrumsandiscompressedbetweenthem. Thesurfaceoftherotatingdrums,incontactwiththecottonwebaremaintainedatatemperatureof(35 4) C(see5.1.4). Thesurfaceoftherotatingdrumsshallbecleanatthepoint

29、wherethewebisreceivedandthepressureis applied(see5.1.4). 5.1.4 Heatingandcleaningdevice Theheatingandcleaningdevicecomprisesthefollowingcomponents. Foreachrotatingdrumandrunningincontactwithit,acylindricalbrushrotatingat1800min 1 .Thecleaning elementoftherotatingbrushisconstructedfromamixtureofmetal

30、wiresandpolypropylenefilaments,in ordertobeaggressiveenoughforcleaningstickydepositsandhaveagoodwearresistance. Foreachrotatingdrum,touchingthedrumatatangent,ahardenedmetalscraperbladewhosefunctionis toscrapeawayanystickydepositsnotremovedbythecleaningbrushes. NOTE1 Foreachrotatingdrum,mountedincont

31、actwithasegmentofthecircumferenceofthedrum,andlocatedafter therotatingbrushesandthescraperblades,astationaryormovingrollercoveredwithwiperclothmadeofpolypropylene nonwovenmaterial. Foreachcleaningbrush,avacuumslotwhichremovesthematerialthatwascleanedfromthedrumby thebrush.EN142783:2004(E) 7 Amanualo

32、rautomaticcontrollerwhichregulatesthepressureexertedbyeachcleaningbrushuponits rotatingdrumaccordingtothetemperatureoftherotatingdrum,whichhastobemaintainedatacertain level(see5.1.3). NOTE2 Thisaggressivecleaningsystemisusedtocleanboththefibresandthestickymaterialsfromtherotating drumsinordertopreve

33、ntsecondrepeateddetectionofthesamedepositagain. 5.1.5 Webremovaldevice Thewebremovaldeviceconsistsofavacuumslotmountedjustundertherotatingdrums,whosefunctionis tocollectthecottonwebafterithaspassedbetweenthetworotatingdrums,leavingbehindanysticky depositsthatadheretotherotatingdrums. 5.1.6 Stickypoi

34、ntdetectionandanalysisdevice Thedetectionandanalysisdevicecomprises: Foreachrotatingdrum,avacuumslotismountedparalleltotheaxisofthedrum(5 0,2)mmfromthe surfaceofthedrum.Thefunctionistostraightenthefibresbeforecounting. Foreachrotatingdrum,alaserbeamisdirectedparalleltotheaxisofthedrum(1,0 0,1)mmfrom

35、the surfaceofthedrum,towardsaphotodiodeontheoppositesideofthedrum.Thelaserbeamof(0,20+/ 0,01)mmistargetedtoapinholeof(0,70+/0,01)mmdiameterinboththesourceandthetarget locations. Wheneverthelaserbeamisinterrupted,byoneormorefibresadheringtothedrum,asignalis generatedwhoseamplitudeanddurationdependson

36、theextentoftheinterruption.Aspecialsoftware algorithmisusedtointerpretthesignalsintermsofthetotalnumberofstickypointsandtheirsizes. Resultsarepresentedonthecomputerscreen. 5.2Balance Balanceabletoweighbetween3,5gand200g,withanaccuracyof0,1g. 6 Atmosphereforconditioningandtesting Theatmosphereforcond

37、itioningandtestingasdefinedinEN20139shallbeused. 7 Preparationoftestspecimens Conditionthecottonfibresample(laboratorysample)duringatleast24hinstandardconditions. NOTE Ifthecottonfibresamplehasahighmoisturecontent,samplepredryingcouldberequired,becausethe equilibriuminmoisturehastobereachedfromthedr

38、iedstate. Weigheachtestspecimentobe(3,5 0,2)g. Manipulateeachtestspecimen,bypinching,drawingandrolling,untilitisformedintoakindofsliverwitha lengthof(30 3)cmandadiameterapproximately4cm,moreorlessuniformalongitslength. 8Procedure 8.1Automaticdevicesetup Followtherecommendationsofthesupplierforcleani

39、ng,stabilisationoftheinstrument,calibration,useofthe software.EN142783:2004(E) 8 8.2Operatetheequipment Introduceatestspecimenintothefeedingzoneofthemicrocardandrunthetest. Theautomaticdeviceprocessesthetestspecimenasfollows: a) preparationofthecottonweb,withthedevicedescribedin5.1.2 b) developmento

40、fpotentialstickypointsbyapplicationofpressuretothecottonweb,withthedevice describedin5.1.3.Controlledtemperatureatthesurfaceoftherotatingdrumsisrealisedwiththedevice describedin5.1.4 c) removalofthecottonwebtogetherwithanyloosefibresfromtherotatingdrums,withthedevice describedin5.1.5 d) signalanalys

41、isforcountingandmeasuringofthestickypoints,withthedevicedescribedin5.1.6 Repeattheprocedurewiththetwoothertestspecimens. 9 Calculationandexpressionofresults Foreachtestspecimens,calculatethenumberofstickypointspergrambydividingthenumberofsticky pointsbythetestspecimenmass. Expressthetotalnumberofsti

42、ckypointspergrambycalculatingthearithmeticmeanofthepreviousresults ofthethreetestspecimens. NOTE Thestickypointscouldbeclassifiedin5categoriesaccordingtotheirsize:size1,thesmallest,size5,the largest.EN142783:2004(E) 9 10 Testreport 10.1Generalinformation Thereportshallcontainthefollowinginformation:

43、 a) ReferencetothisEuropeanStandard. b) Identificationoftestsample,andsamplingprocedureifrequired. c) Anydeviationfromgivenprocedure. 10.2 Testresults a) Numberofstickypointsforeachspecimen. b) Themeanvalueresultofthethreetests.EN142783:2004(E) 10 Annex A (informative) Statisticalinformation A.1 Statisticalanalysis ThestatisticalanalysisofthenumberofstickypointsshowsthattheirdistributionisnotNormal