1、BRITISH STANDARD BS EN 787:1994 Sacks for the transport of food aid Sacksmadeof polyethylene film The European Standard EN787:1994 has the status of a British Standard UDC 621.798.151:663/664:620.1BSEN787:1994 This British Standard, having been prepared under the directionof the Packaging andFreight
2、 Containers StandardsPolicy Committee, waspublished under the authorityof the StandardsBoardand comesintoeffecton 15September1994 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PKM/11 Draft for comment 92/42455 DC ISBN 0 580 22793 6 Cooperating orga
3、nizations 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 normalisation Denmark Dansk Standar
4、d 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 Authority of Ireland Italy Ente Nazionale Italian
5、o 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 Standardiseringskommissionen i Sverige Switzerlan
6、d Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN787:1994 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 787 3 National annex NA (infor
7、mative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN787:1994 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Packaging and Freight Containers Standards Policy Committee and is the E
8、nglish language version of EN787:1994 Sacks for the transport of food aid Sacks made of polyethylene film, published by the European Committee for Standardization (CEN). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsi
9、ble for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 4, an inside back cover and a back cover. This
10、standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 787 May 1994 UDC 621.798.151:663/664:620.1 Descriptors: Packing, bags, plastics, sheet
11、s, polyethylene, food products, characteristics, tests, mechanical strength English version Sacks for the transport of food aid Sacks made of polyethylene film Sacs pour le transport de laide alimentaire Sacs faits dun film de polythylne Scke fr den Transport von Lebensmitteln frdie Nahrungsmittelhi
12、lfe Beutel aus Polyethylenfolie This European Standard was approved by CEN on1994-05-12. 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 lis
13、ts 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 respo
14、nsibility 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway
15、, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 787:1994 EEN787:1994 BSI 12-
16、1999 2 Foreword This European standard was drawn up by CEN Technical Committee CEN/TC120, Sacks for the transport of food aid, the secretariat of which is held by NNI. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associa
17、tion, and supports essential requirements of EC Directive(s). 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 November1994, and conflicting national standards shall be withdrawn at the latest by N
18、ovember. In accordance with the common CEN/CENELEC Rules, 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, Sweden, Switzerland and United King
19、dom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 General characteristics 3 5 Test methods and requirements 3 6 Marking 4 7 Test report 4EN787:1994 BSI 12-1999 3 1 Scope This European standard specifies the general characteristics, requirements and methods of test fo
20、r sacks made of polyethylene film. This standard applies to sacks made of polyethylene film with a net filling weight up to2000g for packing and transporting foodstuffs for food aid and to polyethylene film sacks with a net filling weight up to1000g supplied as empty sacks together with foodstuffs p
21、acked in sacks for the distribution of small quantities. The packaging surrounding filled sacks is not covered by this standard. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the a
22、ppropriate places in the text 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 pu
23、blication referred to applies. EN 22233:1992, Packaging Complete filled transport packages. Conditioning for testing. (ISO2233:1986) EN 26590-2:1992, Packaging Sacks Vocabulary and types Part 2: Sacks made from thermoplastic flexible film. (ISO 6590-2:1986) EN 26591-2:1992, Packaging Sacks Descripti
24、on and method of measurement Part 2: Empty sacks made from thermoplastic flexible film. (ISO 6591-2:1985) EN 27023:1992, Packaging Sacks Method of sampling empty sacks for testing. (ISO 7023:1983) ISO 1184:1983, Plastics Determination of tensile properties of films. ISO 7765-1:1988, Plastic film and
25、 sheeting Determination of impact resistance by the free-falling dart method Part 1: Staircase method. 3 Definitions For the purpose of this Standard, the following definitions apply. NOTEOther terms used in the manufacture of sacks are defined in EN26590-2:1986. 3.1 sack made of polyethylene film c
26、ontainer made from polyethylene tubular film sealed at least at one end by a seam NOTE 2Hereafter where the word “sack” is used in the text of this European Standard, a sack made of polyethylene film is to be understood. 3.2 ply a film of polyethylene forming the walls of a sack 3.3 heat-sealed seam
27、 a closure produced by heat-sealing the bottom or top of the sack 4 General characteristics 4.1 Construction 4.1.1 The sacks shall be made of polyethylene tubular film. 4.1.2 The sacks shall be made of only one ply. 4.1.3 The sacks shall be flat. 4.1.4 The empty sacks, laid flat, shall have a rectan
28、gular shape. 4.1.5 The sack seam shall be designed to prevent leakage of the product during transport. 4.2 Dimensions 4.2.1 The sack dimensions shall be chosen so that the dimensions of the filled sack are aligned with the specified dimensions of the surrounding packaging. 4.2.2 The dimensions and d
29、imensional tolerances of the sack should be agreed upon between the purchaser and the supplier. 4.2.3 The dimensions and dimensional tolerances of the sack shall be recorded in the ordering documents. 4.2.4 The description of the dimensions, the methods of measuring the dimensions and the dimensiona
30、l designation of the sack shall be in accordance with EN26591-2. 4.3 Food compatibility Sacks which come in contact with foodstuffs shall meet the legal requirements of the CEN member states which are applicable to them. 5 Test methods and requirements 5.1 Sampling 5.1.1 Sampling shall be in accorda
31、nce with EN27023. At least30 empty sacks shall be sampled. 5.1.2 Samples shall be taken on the day that the empty sacks are ready for dispatch at the suppliers.EN787:1994 4 BSI 12-1999 5.1.3 If, as a result of an accident during sampling or testing, resampling is necessary, a new sample shall be tak
32、en by the same procedure. Selection may then, however, be made from the same units as before unless agreed otherwise. 5.2 Conditioning 5.2.1 Before testing, all samples shall be conditioned in accordance with EN22233:1992 condition G (temperature+23 C 2 C, relative humidity50% 5%). 5.2.2 The minimum
33、 period for conditioning shall be not less than8h. 5.2.3 The various tests described below shall be carried out in the same atmospheric conditions as used for conditioning. If this is not possible, the tests shall commence within10min of conditioning. 5.3 Test date All tests shall be carried out wit
34、hin4 weeks of the date that the empty sacks are ready for dispatch at the suppliers. 5.4 Tests 5.4.1 Determination of the tensile force of the film The tensile force of the film shall be determined as described in ISO1184 using15mm wide test strips, with a gauge length of100mm and a testing speed of
35、500mm/min. 5.4.2 Determination of the seam strength of the sack The seam strength shall be determined in accordance with ISO1184 using15mm wide strips, with a gauge length of100mm, a seam lying transversely to the direction of pull and in the middle of the test strip and with a testing speed of500mm
36、/min, until rupture. 5.4.3 Determination of the impact resistance of the film The impact resistance of the film shall be determined in accordance with ISO7765-1:1988, method A. 5.5 Acceptance criteria 5.5.1 Tensile force of the film The tensile force of the film shall be at least7,5N/15mm in the lon
37、gitudinal and transverse directions at15% elongation. 5.5.2 Seam strength of the sack The ultimate tensile strength of the test piece with a seam shall be at least70% of the ultimate tensile strength of the film without a seam in the same direction (sealing factor0,7). 5.5.3 Impact resistance of the
38、 film The mass for50% failure shall be not less than120g. 6 Marking If permitted, marking of the sack by the supplier is voluntary. 7 Test report The test report shall include a statement that all tests have been carried out in accordance with this European Standard and shall include at least the fo
39、llowing information: a) name and address of the manufacturer; b) number of the contract or order reference; c) date, place and description of sampling; d) description of the sack in accordance with 4.2.4 of this European Standard; e) results of the tensile force test, mean value and the standard dev
40、iation; f) results of the seam test, mean value and standard deviation; g) results of the impact resistance test; h) any deviations from the test methods specified in this standard; i) name and address of the tester; j) signature of the tester; k) date of test.BSEN787:1994 BSI 12-1999 National annex
41、 NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Packaging and Freight Containers Standards Policy Committee (PKM/-) to Technical Committee PKM/11, upon which the following bodies were represented: Aluminium F
42、ederation Association of the British Pharmaceutical Industry British Aerosol Manufacturers Association British Paper and Board Industry Federation Chartered Institute of Purchasing and Supply Coated Paper and Board Makers Association Department of Health Department of Trade and Industry (Laboratory
43、of the Government Chemist) Environmental and Technical Association for the Paper Sack Industry Flexible Packaging Association Food and Drink Federation Institute of Wastes Management Packaging and Industrial Films Association Pira International Sterilization Packaging Materials Association The follo
44、wing bodies were also represented in the drafting of the standard, through subcommittees and panels: British Cement Association British Polyolefin Textiles Association Chemical Industries Association Jute Sack and Bag Manufacturers Association Paper Sack Development Association Ltd. Potato Marketing
45、 Board United Kingdom Jute Goods Association United Kingdom Sugar Industry Association National annex NB (informative) Cross-references Publication referred to Corresponding British Standard EN 22233:1992 BS EN 22233:1993 Complete filled transport packages. Method of conditioning for testing BS EN 2
46、6590 Packaging Sacks Vocabulary and types EN 26590-2:1986 Part 2:1993 Sacks made from thermoplastic flexible film BS EN 26591 Packaging Sacks Description and method of measurement EN 26591-2:1985 Part 2:1993 Empty sacks made from thermoplastic flexible film EN 27023:1983 BS EN 27023:1993 Packaging S
47、acks Method of sampling empty sacks for testingBS EN 787:1994 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
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