C41 Instrumental Colour Measurement of Textiles March 230310Word格式文档下载.docx
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C41 Instrumental Colour Measurement of Textiles March 230310Word格式文档下载.docx
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ReplacesC41datedNovember2008
Introduction
WhatisC41Accreditation?
Mostgooddyershavegoodqualityinstrumentalcolourmeasurementequipment.Themoderngenerationofspectrophotometersareextremelyrobustandreliablebuttheycandriftoutofspecificationandsorequireregularservicingandre-calibration.
Evenwithagoodcolourmeasurementsystemitisimportantthatoperativesfollowspecificprocedurestoensurethatreliablemeasurementsareobtained.
FollowingtheC41methodguaranteesthatcolourmeasurementsaremadeinthepropermannerbytrainedoperativesonmachinerythatisoperatingwithinverytightlycontrolledtolerances.
TheaccreditationofmachineryandoperativesgivesMarks&
Spencerconfidencethatanaccreditedsupplier’scolourmeasurementscanbetrusted.
Whatarethebenefits?
Accrediteddyerscanself-approvecolourthatiswithinspecifiedtolerancesandremovetheneedtomakephysicalsubmissions.Thistypicallyremovesonetotwoweeksfromtheleadtimeandreducespostageandcouriercostsassociatedwithlabdyesandshippingsamples.
Whereaccrediteddyerscannotquitematchashadewithinspecifiedtolerancestheycansimplye-mailthedatatoMarks&
SpencerColourManagementDepartmentforon-screenapproval.
WhatarethechangesfromthepreviousversionofC41?
TheC41requirementshavebeenmodifiedtoimprovereliabilityandtoreducethecostandadministrativeburden.
DyershadtohaveaverygoodreasontobecomeC41accreditedinthepast.TheeasewithwhichdyerscannowgainC41accreditationissuchthattheymustnowhaveaverygoodreasonnottobecomeaccredited.
∙Teamaccreditationensuresthatalloperativeswillnowbeaccreditedandthisisasignificantmovetowardsminimisinghumanerror.
∙Theactualmeasurementtechniquehasbeenchangedinlinewithinternationallyacceptedbestpracticetodelivergreaterreproducibility.
∙DyerscanchosetohavetheiraccreditationcarriedoutbytheirSpectrophotometermanufacturertoreducecostandremovetheneedformultiplevisits.
∙Allbarrierstoaccreditationhavebeenremoved–adyerdoesnotneedtobeauthorisedtobecomeaccredited,theMS89colourdifferenceequationisavailablewithoutauthorisationandisfreeofchargeinmostinstances–alldyershavetodoisasktheirSpectrophotometersuppliertoaccreditthematthetimeofannualservice/re-calibration.
∙Thenumberandfrequencyoftilecheckshasbeendrasticallyreducedandtheneedforexpensivetilere-characterisationhasbeenremoved.
∙Theapprovaltolerancesforcertainproductareashavealsobeenreviewedandrelaxedtoreflectcustomer’sexpectationsofthoseproducts.
InadditiontosettingouttherequirementsoftheC41methodthisdocumentaimstogiveadviceandbestpracticeindealingwithsomeoftheeverydayissuesthatdyers,retailersandgarmentmaker’sfaceonadailybasis.IfanythingisunclearpleasedonothesitatetocontactanymemberoftheUKColourManagementteam.
Aswellasthesespecialistcolouraccreditationsabove,supplierscanalsouseother
GlobalAccreditationScheme
MarksandSpencerareawarethatitiscostlyandinconvenientfordyerstobecomeaccreditedfornumerousindividualinstrumentalcolourmeasurementschemes.
WewillthereforeacceptthefollowingschemesasbeingequivalenttoC41.
DatacolorCertified-SilverLevel*
PleasecontactDavidHudson–gperks@
*ThisisatieredschemeandM+SwillaccepttheSilverlevelandaboveasbeingequivalenttoC41,providedanapprovedconditioningcabinetWITHLIGHTSisused
Marks&
SpencerapprovedaccreditationagenciesforC41.(seeQualityManagementWebsite)
–Labaccreditation–Section2–page7
–Approvedtesthouses–M&
STests
INDEX
EquipmentRequirements
C41MethodandBestPractices
1.Enteringstandarddata
2.Machineset-up
3.Fabricsformeasurement
4.Conditioning
5.Samplemeasurement
6.ResultsandPass/faildecisions
7.Approvaltolerances
8.Shadematchingbestpractice
9.Manipulationofresults
10.Careofmachineryandequipment
11.Performancechecksandrecordkeeping
12.Accreditation
13.InstrumentalmeasurementofWhites
14.Contacts
Appendix–Accreditor’schecklist
Spectrophotometer–Approvedmachines
Datacolor–SpectraflashSF500
-SpectraflashSF600(CTmodel)/PlusCTmodel/SF600x
-Datacolor600
-SpectraflashSF650/Datacolor650
GretagMacbeth–Colour-eye7000and7000A
X-rite–Colori7000
Minolta–Minolta3700D
TheminimumstandardisthattheSpectrophotometerwillrequireanannualservice,
re-calibrationandaccreditation.
Aservicecontractisnotarequirementbutastrongrecommendation
Ifadyerchoosestomea
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