1、 DEUTSCHE NORM July 2006DIN EN 646 ICS 67.250; 85.060 Supersedes DIN EN 646:2000-12 Paper and board intended to come into contact with foodstuffs Determination of colour fastness of dyed paper and board English version of DIN EN 646:2006-07 Papier und Pappe vorgesehen fr den Kontakt mit Lebensmittel
2、n Bestimmung der Farbechtheit von gefrbtem Papier und Pappe Englische Fassung DIN EN 646:2006-07 Document comprises 10 pages No part of this standard may be reproduced without prior permission of DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclu
3、sive right of sale for German Standards (DIN-Normen). English price group 7 www.din.de www.beuth.de !,p$G“11.06 9770136DIN EN 646:2006-07 2 National foreword This standard has been prepared by CEN/TC 172 Pulp, paper and board (Secretariat: Germany). The leading Technical Committee within CEN/TC 172
4、is WG 3 Analytical methods of the assessment of paper and board in contact with foodstuffs (chairmanship: Austria). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee 421/NPa Chemisch-technologis
5、che Prf-verfahren fr Papier, Pappe, Faserstoff und Chemiezellstoff. The DIN Standard corresponding to the International Standard referred to in clause 2 of the EN is as follows: ISO 8787 DIN ISO 8787 Amendments This standard differs from DIN EN 646:2000-12 as follows: a) The test fluid sodium carbon
6、ate solution has been replaced by the more common test fluid saliva simulant. b) The standard has been editorially revised. Previous editions DIN 53991-1: 1971-07, 1985-11 DIN EN 646: 1994-01, 2000-12 National Annex NA (informative) Bibliography DIN ISO 8787, Testing of paper and board Determination
7、 of capillary rise; Klemm method EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 646 April 2006 ICS 67.250; 85.060 Supersedes EN 646:2000 English Version Paper and board intended to come into contact with foodstuffs - Determination of colour fastness of dyed paper and board Papiers et cartons d
8、estins entrer en contact avec les denres alimentaires - Dtermination de la solidit de la couleur des papiers et cartons colors Papier und Pappe vorgesehen fr den Kontakt mit Lebensmitteln - Bestimmung der Farbechtheit von gefrbtem Papier und Pappe This European Standard was approved by CEN on 28 Mar
9、ch 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-date lists and bibliographical references concerning such national standards may be obta
10、ined 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 responsibility of a CEN member into its own language and notified to the Central Secr
11、etariat 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Po
12、rtugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any me
13、ans reserved worldwide 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 c
14、ontact).6 10 Procedure 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
15、 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 supersedes EN 646:2000. With regard to EN 646:2000 the following changes
16、 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 standards organizations of the following countries are bou
17、nd 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
18、 and United Kingdom. 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 dura
19、tion (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 references The following referenced documents are indispensable for the
20、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 method 3 Terms and definitions For the purpose
21、s of this document, the 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
22、 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 fluids used are distilled or deio
23、nised water, dilute acetic 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 i
24、n 10 min in accordance 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
25、grading is required. 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
26、.15 Dipotassium hydrogen 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 ap
27、prox. 900 ml water. Then 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 ac
28、id until a constant pH 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 long
29、er than 2 weeks, it is 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 n
30、umber max. 10 (expressed 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
31、 be obtained. 9 Procedure 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 unstaine
32、d 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 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
33、 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 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 agai
34、nst direct light penetration. 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.
35、2, with each unstained 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 gl
36、ass 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. 10 Procedure B (short time contact) 10.1 Immerse t
37、wo 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. 10.2 Place one sheet of unstained glass fibre paper with its smooth side upwards on the glass pl
38、ate (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 again. Place a second glass plate (5.2) on
39、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 10 min at (23 2) C with protection against direct light penetration. 10.3 After 10 min open the assem
40、bly. Place the unstained 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 a
41、re not dried. 11 Evaluation 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 pape
42、rs are used, evaluate 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 bleedin
43、g, the result is given 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
44、 the evaluation grade 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
45、 possible to show compliance 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 app
46、licable; d) procedure 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 colour fastness Part A03: Grey scale for assessing staining (ISO 105-A03:1993)
