1、BRITISH STANDARD BS EN 645:1994 Paper and board intended to come into contact with foodstuffs Preparation of a cold water extract The European Standard EN 645:1993 has the status of a British Standard UDC 676.2:663/664:620.1:543.8BSEN 645:1994 This British Standard, having been prepared under the di
2、rectionof the Consumer andContract Goods StandardsPolicyCommittee, waspublishedunder the authorityofthe Standards Boardand comes into effect on 15 February1994 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CCM/47 Draft for comment 92/39054 DC ISBN
3、0 580 22478 3 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de norma
4、lisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authori
5、ty of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standar
6、diseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 645:1994 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword
7、2 Text of EN 645 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 645:1994 ii BSI 11-1999 National foreword This British Standard has been prepared under the direction of the Consumer and Contract Goods
8、Standards Policy Committee and is the English language version of EN645 Paper and board intended to come into contact with foodstuffs Preparation of a cold water extract, published by the European Committee for Standardization (CEN). EN645 was produced as a result of international discussions in whi
9、ch the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of
10、 pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the
11、 inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN645 October1993 UDC 676.2:663/664:620.1:543.8 Descriptors: Paper, paperboards, food products, food-container contact, aqueous extract, preparation, leaching tests, distilled water English version Paper and board intended to come
12、 into contact with foodstuffs Preparation of a cold water extract Papier et carton destins entrer en contact avec les denres alimentaires Prparation dun extrait aqueux froid Papier und Pappe vorgesehen fr den Kontakt mit Lebensmitteln Herstellung eines Kaltwasserextraktes This European Standard was
13、approved by CEN on1993-10-01. 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
14、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 responsibility of a CEN member into its own language and notifie
15、d to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. C
16、EN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN645:1993 EEN 645:1993 BSI 11-1999 2 Foreword This European Standard has been prepared by
17、the Technical Committee CEN/TC172 “Pulp, paper and board”, the secretariat of which is held by DIN. This European Standard shall be given the status of National Standard, either by publication of an identical text or by endorsement, at the latest by April1994, and conflicting National Standards shal
18、l be withdrawn at the latest by April1994. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
19、 Sweden, Switzerland and the UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Principle 3 5 Reagents 3 6 Apparatus 3 7 Sampling 3 8 Procedure 3EN 645:1993 BSI 11-1999 3 1 Scope This European Standard describes the preparation of a cold water extract for inv
20、estigations of certain extractives in paper and board intended to come into contact with foodstuffs. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the tex
21、t and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applie
22、s. ISO186, Paper and board Sampling to determine average quality. ISO287, Paper and board Determination of moisture content Oven drying method. ISO536, Paper and board Determination of grammage. ISO1042, Laboratory glassware One-mark volumetric flasks. ISO1773, Laboratory glassware Boiling flasks (n
23、arrow necked). ISO6556, Laboratory glassware Filter flasks. 3 Definition For the purposes of this standard, the following definition applies. cold water extract the water solution obtained as a result of the cold extraction NOTEIn certain instances this extract can contain small amounts of suspended
24、 particles. 4 Principle The sample is torn or cut and extracted with water at(23 2) C for24h, shaking occasionally. After extraction the extract is filtered if necessary, the extract or the filtrate (cold water extract) is used for the investigation of the extractives. 5 Reagents 5.1 Distilled water
25、 or water or equal purity. NOTEThe quality of the water should be in accordance with the requirements of the appropriate test method for the determination of the specific extractive. 6 Apparatus 6.1 Balance, accurate to0,001g. 6.2 500ml conical flask, wide neck with ground glass stopper (seeISO1773)
26、. 6.3 Filtration equipment, fritted-glass filter porosity4 (nom.size90) with filter flask of500ml (seeISO6556). 6.4 Graduated measuring cylinder,250ml. 6.5 One-mark volumetric flask,250ml (seeISO1042). 6.6 Protective gloves 6.7 Ceramic scissors (needed only for the determination of metals). 7 Sampli
27、ng 7.1 Sampling is carried out in accordance with ISO186. Do not touch the test area of sample or test specimen with the fingers; use protective gloves(6.6). 7.2 A minimum of10g of sample is required. 7.3 If required, take a separate sample for the determination of the grammage in accordance with IS
28、O536 and/or for the determination of moisture content (seeISO287). 8 Procedure 8.1 Tear or cut the sample as taken into pieces of approx.1cm 2to2cm 2 . Use protective gloves(6.6). 8.2 Weigh(10 0,1)g of the test pieces to an accuracy of0,01g, put them into the conical flask(6.2), add200ml(6.4) of wat
29、er(5.1) and stopper the flask. Leave this preparation to stand for24h at(23 2) C, shaking occasionally. Decant the solution and wash the test pieces remaining in the flask twice. If necessary filter the preparation(6.3). Transfer the extract and the washings or the filtrate to a marked volumetric fl
30、ask(6.5) and fill up to the mark with water(5.1). Use the content of the flask for further investigation. NOTEIf necessary, scaling up can be done but not more than twice.4 blankBSEN 645:1994 BSI 11-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the p
31、reparation of this European Standard was entrusted by the Consumer and Contract Goods Standards Policy Committee (CCM/-) to Technical Committee CCM/47 upon which the following bodies were represented: Association of Metropolitan Authorities Association of Public Analysts British Paper and Board Indu
32、stry Federation British Plastics Federation Ministry of Agriculture, Fisheries and Food Pira International Co-opted Members National annex NB (informative) Cross-references Publication referred to Corresponding British Standard ISO186:1985 BS3430:1986 Method for sampling to determine the average qua
33、lity of paper and board ISO536:1976 BS3432:1980 Method of determination of grammage of paper and board ISO1042:1983 BS1792:1982 Specification for one-mark volumetric flasks ISO1773:1976 BS2734:1984 Specification for boiling flasks (narrow-necked), conical, flat bottom and round bottom ISO6556:1981 B
34、S1739:1982 Specification for filter flasksBS EN 645:1994 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incor
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