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1、BRITISH STANDARDBS EN646:2006Paper and board intended to come into contact with foodstuffs Determination ofcolour fastness of dyed paper and boardThe European Standard EN 646:2006 has the status of aBritish StandardICS 67.250; 85.060 BS EN 646:2006National forewordThis British Standard is the offici
2、al English language version ofEN 646:2006. It supersedes BS EN 646:2001 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps, which has the responsibility to:aid enquirers to understand the text;present to
3、the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed;monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on
4、 request to its secretary.Cross-referencesThe 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 BS
5、I Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pag
6、esThis document 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 notice displayed in this document indicates when the document was last issued.Amd. No.DateCommentsThis British Standard was published under the aut
7、hority of the Standards Policy and Strategy Committeeon 30 June 2006 BSI 2006ISBN 0 580 48809 8Amendments issued since publicationEUROPEAN STANDARD NORME EUROPENNEEUROPISCHE NORMEN 646April 2006ICS 67.250; 85.060Supersedes EN 646:2000English VersionPaper and board intended to come into contact with
8、foodstuffs - Determination of colour fastness of dyed paper and boardPapiers et cartons destins entrer en contact avec les denres alimentaires - Dtermination de la solidit de la couleur des papiers et cartons colorsPapier und Pappe vorgesehen fr den Kontakt mit Lebensmitteln - Bestimmung der Farbech
9、theit von gefrbtem Papier und PappeThis European Standard was approved by CEN on 28 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-da
10、te lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the
11、responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, I
12、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T EUR O P EN DE NOR M A L I S A TI ON EUR O P I S C H ES KOM I TEE F R NOR M UNG Manag
13、ement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 646:2006: EEN 646:2006 (E)Contents PageForeword .31Scope .42Normative references .43Terms and definitions .44Principle.45Materials
14、 and equipment .46Reagents.57Sampling.58Preparation of sample .69Procedure A (long duration contact) .610Procedure B (short time contact).611Evaluation .612Report .7Bibliography.87ForewordThis document (EN 646:2006) has been prepared by Technical Committee CEN/TC 172 “Pulp, paper and board”, the sec
15、retariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latest by October 2006.This document sup
16、ersedes EN 646:2000.With regard to EN 646:2000 the following changes have been made:a)the test fluid sodium carbonate solution has been omitted and the test fluid saliva simulant has been introduced to cover a demand;b)editorial changes.According to the CEN/CENELEC Internal Regulations, the national
17、 standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portug
18、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.1 ScopeThis document describes procedures for the testing of dyed paper and board intended to come into contact with foodstuffs. Two procedures are given. Procedure A for contact of long duration (e. g. food packaging) an
19、d procedure B for contact of short duration (e. g. napkins, kitchen papers, household papers).Visual evaluation against a blank is used only in order to detect any bleeding (yes/no) while evaluation against a grey scale provides grading of the bleeding.2 Normative referencesThe following referenced
20、documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 8787, Paper and board Determination of capillary rise Klemm method3 Ter
21、ms and definitionsFor the purposes of this document, the following term and definition applies.colour fastnesslack of transfer of colour from a paper to a non stained glass-fibre paper, saturated with a test fluid and evaluated visually for staining against a grey scale or a blank4 PrincipleA sample
22、 is brought into contact with glass fibre papers which have been saturated with a test fluid and placed under load for a given time. The staining of the glass fibre paper is evaluated with the grey scale. The staining of the glass fibre paper is evaluated against a blank or grey scale. The test flui
23、ds used are distilled or deionised water, dilute acetic acid, saliva simulant and olive oil depending on the type of contact expected.5 Materials and equipment5.1Unstained glass fibre papers of 60 mm 90 mm. The glass fibre papers shall meet the following conditions:a)grammage 70 g/m;b)capillary rise
24、 of 190 mm to 210 mm in 10 min in accordance with ISO 8787;c)free from fluorescent whitened and wet strength agents;d)free from cellulosic fibres.5.2Glass plates, 60 mm 90 mm.5.3Polyethylene film, uncoloured and transparent.5.4Mass, 1 kg.5.5Grey scale in accordance with EN 20105 A03. This is only ne
25、eded when grading is required.6 Reagents6.1Distilled or deionised water6.2Aqueous acetic acid 3,0 % (m/v)6.3Saliva simulant 5 g/l6.3.1Composition of the simulated saliva with a pH of 6.8 0.1ReagentsMass fractiong/lMagnesium chloride (MgCl26H2O)0.17Calcium chloride (CaCl22H2O)0.15Dipotassium hydrogen
26、 phosphate (K2HPO42H2O)0.76Potassium carbonate (K2CO3)0.53Sodium chloride (NaCl)0.33Potassium chloride (KCl)0.75Hydrochloric acid (1%, mass fraction)Added until pH value equals 6.8 0.16.3.2Production of simulated salivaDissolve the potassium and sodium salts in approx. 900 ml water. Then add the cal
27、cium chloride and magnesium chloride and stir until all added reagents have dissolved completely. Calibrate the pH meter with a buffer solution as stipulated by the manufacturer. Then immerse the pH electrode into the solution, stir briefly and add hydrochloric acid until a constant pH of 6.8 0.1 ha
28、s been obtained. Transfer the solution to a 1000 ml volumetric flask and fill to the mark with water. Store protected from light and make sure that the pH of the simulated saliva is in the 6.8 0.1 range prior to use.NOTEIf the simulated saliva is to be kept longer than 2 weeks, it is advisable to us
29、e water that has been boiled for 10 minutes.6.4Iso-octane (2,2,4-trimethylpentan)6.5Rectified olive oil, characterized as follows: iodine value (Wijs)80 to 88 refractive index at 25 C1,4665 to 1,4679 acidity (expressed as % oleic acid)max. 0,5 % peroxide numbermax. 10 (expressed as oxygen milli-equi
30、valents per kg oil)7 SamplingIf a lot is tested then sampling is carried out in accordance with EN ISO 186.8 Preparation of sampleCut or punch several test pieces of 50 mm 20 mm from the sample under investigation. Smooth edges shall be obtained.9 Procedure A (long duration contact)9.1Immerse two sh
31、eets of unstained glass fibre paper (5.1) in a test fluid (6.1, 6.2, 6.3, 6.4 or 6.5). Remove the sheets after saturation and free the sheets from excess fluid by wiping on the rim of the container.9.2Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.2
32、). Place the test piece (Clause 8) immediately on the unstained glass fibre paper. Cover it with the second saturated sheet of unstained glass fibre paper, so that the smooth side of the unstained glass fibre paper is in contact with the test piece again. Place a second glass plate (5.2) on top of t
33、he second unstained glass fibre paper and wrap the total assembly in polyethylene film (5.3) to prevent the edges from drying out, load it with a mass of 1 kg (5.4) and allow it to stand for 24 h at (23 2) C with protection against direct light penetration.9.3If test pieces of a grammage of 140 g/m
34、are to be investigated, an appropriate even number of unstained glass fibre paper layers (5.1) is used so that the total of their grammages just exceeds the grammage of the test piece.Construct the assembly as described in 9.2, with each unstained glass fibre paper being individually saturated and w
35、iped, and arranged in such a way that the same number of unstained glass fibre papers are in contact with both sides of the test piece.9.4After 24 h open the assembly. Place the unstained glass fibre papers on 3 adjacent glass rods, 8 mm to 10 mm, with the side which was in contact with the test pie
36、ce upwards, cover them without contact to prevent light penetration and air-dry at ambient temperature. Unstained glass fibre papers saturated with olive oil are not dried.10 Procedure B (short time contact)10.1 Immerse two sheets of unstained glass fibre paper (5.1) in a test fluid (6.1, 6.2, 6.3,
37、6.4 or 6.5). Remove the sheets after saturation and free the sheets from excess fluid by wiping on the rim of the container.10.2 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.2). Place the test piece (Clause 8) immediately on the unstained glass fi
38、bre paper. Cover it with the second saturated sheet of unstained glass fibre paper, so that the smooth side of the unstained glass fibre paper is in contact with the test piece again. Place a second glass plate (5.2) on top of the second unstained glass fibre paper and wrap the total assembly in pol
39、yethylene film (5.3) to prevent the edges from drying out, load it with a mass of 1 kg (5.4) and allow it to stand for 10 min at (23 2) C with protection against direct light penetration.10.3 After 10 min open the assembly. Place the unstained glass fibre papers on three adjacent glass rods, 8 mm to
40、 10 mm, with the side which was in contact with the test piece upwards, cover them without contact to prevent light penetration and air-dry at ambient temperature. Unstained glass fibre papers saturated with olive oil are not dried.11 EvaluationEvaluate the staining of the glass fibre papers on the side with which they were in contact with the sample, using a blank
