1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58foodstuffs Determination of colour fastness of dyed paper and boardThe European Standard EN 646:200
2、6 has the status of a British StandardICS 67.250; 85.060Paper and board intended to come into contact with BRITISH STANDARDBS EN 646:2006BS EN 646:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48809 8requ
3、est 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 BSI Ele
4、ctronic 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 pagesTh
5、is 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.Amendments issued since publicationAmd. No. Date CommentsA list of organi
6、zations represented on this committee can be obtained on present to 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.Nat
7、ional forewordThis British Standard is the official English language version of EN 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 It supersedes BS EN 646:2001 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps, which has the responsibility t
8、o: aid enquirers to understand the text;EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 646April 2006ICS 67.250; 85.060 Supersedes EN 646:2000 English VersionPaper and board intended to come into contact with foodstuffs -Determination of colour fastness of dyed paper and boardPapiers et cartons de
9、stins entrer en contact avec lesdenres alimentaires - Dtermination de la solidit de lacouleur des papiers et cartons colorsPapier und Pappe vorgesehen fr den Kontakt mitLebensmitteln - Bestimmung der Farbechtheit vongefrbtem Papier und PappeThis European Standard was approved by CEN on 28 March 2006
10、.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on ap
11、plication 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has
12、the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
13、,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwi
14、de for CEN national Members.Ref. No. EN 646:2006: EEN 646:2006 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Terms and definitions.4 4 Principle.4 5 Materials and equipment 4 6 Reagents5 7 Sampling5 8 Preparation of sample 6 9 Procedure A (long duration contact).6 10 Procedur
15、e B (short time contact).6 11 Evaluation6 12 Report 7 Bibliography.8 EN 646:2006 (E) 3 Foreword This document (EN 646:2006) has been prepared by Technical Committee CEN/TC 172 “Pulp, paper and board”, the secretariat of which is held by DIN. This European Standard shall be given the status of a nati
16、onal 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 supersedes EN 646:2000. With regard to EN 646:2000 the following changes have been made: a) t
17、he 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 standards organizations of the following countries are bound to implement this
18、European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
19、EN 646:2006 (E) 4 1 Scope This 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) and procedure B for contact of short duration (e. g. napkins,
20、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 references The following referenced documents are indispensable for the application of this d
21、ocument. 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 method 3 Terms and definitions For the purposes of this document, t
22、he following term and definition applies. colour fastness lack 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 blank 4 Principle A sample is brought into contact with glass fibre papers w
23、hich 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 fluids used are distilled or deionised water, dilute a
24、cetic acid, saliva simulant and olive oil depending on the type of contact expected. 5 Materials and equipment 5.1 Unstained 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 of 190 mm to 210 mm in 10 min in accordanc
25、e with ISO 8787; c) free from fluorescent whitened and wet strength agents; d) free from cellulosic fibres. 5.2 Glass plates, 60 mm 90 mm. 5.3 Polyethylene film, uncoloured and transparent. 5.4 Mass, 1 kg. 5.5 Grey scale in accordance with EN 20105 A03. This is only needed when grading is required.
26、EN 646:2006 (E) 5 6 Reagents 6.1 Distilled or deionised water 6.2 Aqueous acetic acid 3,0 % (m/v) 6.3 Saliva simulant 5 g/l 6.3.1 Composition of the simulated saliva with a pH of 6.8 0.1 Reagents Massfraction g/l Magnesium chloride (MgCl26H2O) 0.17 Calcium chloride (CaCl22H2O) 0.15 Dipotassium hydro
27、gen phosphate (K2HPO42H2O) 0.76 Potassium carbonate (K2CO3) 0.53 Sodium chloride (NaCl) 0.33 Potassium chloride (KCl) 0.75 Hydrochloric acid (1%, mass fraction) Added until pH value equals 6.8 0.1 6.3.2 Production of simulated saliva Dissolve the potassium and sodium salts in approx. 900 ml water. T
28、hen add the calcium 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 p
29、H of 6.8 0.1 has 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. NOTE If the simulated saliva is to be kept longer than 2 weeks, it i
30、s advisable to use water that has been boiled for 10 minutes. 6.4 Iso-octane (2,2,4-trimethylpentan) 6.5 Rectified olive oil, characterized as follows: iodine value (Wijs) 80 to 8 refractive index at 25 C 1,4665 to 1,4679 acidity (expressed as % oleic acid) max. 0,5 % peroxide number max. 10 (expres
31、sed as oxygen milli-equivalents per kg oil) 7 Sampling If a lot is tested then sampling is carried out in accordance with EN ISO 186. EN 646:2006 (E) 6 8 Preparation of sample Cut or punch several test pieces of 50 mm 20 mm from the sample under investigation. Smooth edges shall be obtained. 9 Proce
32、dure A (long duration contact) 9.1 Immerse two sheets 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. 9.2 Place one sheet of unstained glass fibre paper w
33、ith its smooth side upwards on the glass plate (5.2). 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
34、again. Place a second glass plate (5.2) on top of the 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 pene
35、tration. 9.3 If test pieces of a grammage of 140 g/m 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 unstaine
36、d glass fibre paper being individually saturated and wiped, 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. 9.4 After 24 h open the assembly. Place the unstained glass fibre papers on 3 adjacent glass rods, 8 mm to 10
37、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. 10 Procedure B (short time contact) 10.1 Immerse two sheets of unstaine
38、d 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. 10.2 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass plate (5.2). Place the
39、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 the second uns
40、tained 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 10 min at (23 2) C with protection against direct light penetration. 10.3 After 10 min open the assembly. Place the unstai
41、ned glass fibre papers on three adjacent glass rods, 8 mm to 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 Eval
42、uation Evaluate the staining of the glass fibre papers on the side with which they were in contact with the sample, using a blank or the grey scale (5.5). If grading is required use the grey scale in accordance with EN 20103 A03. When several layers of unstained glass fibre papers are used, evaluate
43、 only the layer that was in contact with the test piece. If the two sides of the sample produce different results, the test report shall state to which side of the sample the data relates. EN 646:2006 (E) 7 If the evaluation is done against a blank in order to detect any bleeding, the result is give
44、n as “yes“ or “no“. If a grading is provided a distinction is drawn between five different evaluation grades: Grade one signifies poor fastness; grade five signifies good fastness. The grade of the grey scale which is the most similar to the stained glass fibre paper is given as the evaluation grade
45、 of the tested paper. NOTE 1 In the case that paper or board is coming into contact with foodstuffs only with one side (e. g. food packaging) and it is known which side is facing the food, only this side will be evaluated. NOTE 2 As iso-octane is more severe than olive oil it is possible to show com
46、pliance using olive oil, if the test fails with iso-octane. 12 Report The test report shall include the following information: a) Reference to this European Standard; b) test result; c) designation of the paper or board and identification of the sample tested; side tested if applicable; d) procedure
47、 A or B; evaluation yes/no or grading; e) test fluids and associated evaluation notes; f) date of test; g) any deviation from this European Standard. EN 646:2006 (E) 8 Bibliography 1 EN ISO 186, Paper and board - Sampling to determine average quality (ISO 186:2002) 2 EN 20105 A03, Textiles Test for
48、colour fastness Part A03: Grey scale for assessing staining (ISO 105-A03:1993) blankBS EN BSI389 Chiswick High RoadLondonW4 4AL646:2006BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and
49、 at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committ
