1、BRITISH STANDARD BS EN 788:1994 Sacks for the transport of food aid Tubular sacks made of composite film The European Standard EN 788:1994 has the status of a British Standard UDC 621.798.151-416-419:663/664:620.1BSEN 788:1994 This British Standard, having been prepared under the directionof the Pac
2、kaging andFreight Containers StandardsPolicy Committee, waspublishedunder the authorityofthe Standards Boardand comes into effect on 15 September 1994 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PKM/11 Draft for comment 92/42456 DC ISBN 0 580 227
3、94 4 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 normalisation
4、Denmark Dansk Standard 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 E
5、nte 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 Standardiseringskommissionen
6、 i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 788:1994 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 788 3 Na
7、tional annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 788:1994 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Packaging and Freight Containers Standards Policy
8、 Committee and is the English language version of EN788:1994 Sacks for the transport of food aid Tubular sacks made of composite 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 Br
9、itish Standards are responsible 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 6, an inside back c
10、over 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 inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 788 May 1994 UDC 621.798.151-416-419:663/664:620.1 Descrip
11、tors: Packing, bags, composite, materials, polyethylene, polyester resins, aluminium, food products, characteristics, tests English version Sacks for the transport of food aid Tubular sacks made of composite film Sacs pour le transport de laide alimentaire Sacs tubulaires faits dun film composite Sc
12、ke fr den Transport von Lebensmitteln frdie Nahrungsmittelhilfe Schlauchbeutel-Packung aus Verbundfolie This European Standard was approved by CEN on 1994-05-12. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
13、 the status of a national standard without any alteration. Up-to-date 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, Ger
14、man). 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 Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France,
15、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, 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 C
16、opyright reserved to CEN members Ref. No. EN 788:1994 EEN 788:1994 BSI 12-1999 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 g
17、iven to CEN by the European Commission and the European Free Trade Association, 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
18、, and conflicting national standards shall be withdrawn at the latest by November1994. 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, Luxembo
19、urg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 General characteristics 3 5 Test methods and requirements 4 6 Marking 5 7 Test report 5EN 788:1994 BSI 12-1999 3 1 Scope This European stan
20、dard specifies the general characteristics, requirements and methods of test for tubular sacks made of composite film, for example PET/Alu/PE. This standard applies to tubular sacks made of composite film, for example PET/Alu/PE, for the packaging of foodstuffs with a net filling weight up to2000g a
21、nd a storage life of at least1year in tropical climates of38 C and90% relative humidity. The tubular sacks may be used as vacuum or inert gas packages. The packaging surrounding filled tubular sacks is not covered by this standard. 2 Normative references This European Standard incorporates by dated
22、or undated reference, provisions from other publications. These normative references are cited at the appropriate 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 onl
23、y when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 10204:1991, Metallic products Types of inspection documents. EN 22233:1992, Packaging Complete filled transport packages Conditioning for testing. (ISO2233:1986) E
24、N 26590-2:1992, Packaging Sacks Vocabulary and types Part 2: Sacks made from thermoplastic flexible film. (ISO 6590-2:1992) EN 27023:1992, Packaging Sacks Method of sampling empty sacks for testing. (ISO 7023:1983) ISO 186:1985, Paper and board Sampling to determine average quality. ISO 1184:1983, P
25、lastics Determination of tensile properties of films. ASTM D 3985:81, Standard test method for oxygen gas transmission rate through plastic film and sheeting using a coulometric sensor. 3 Definitions For the purpose of this European standard, the following definitions apply. NOTEOther terms used in
26、the manufacture of tubular sacks are defined in EN26590-2:1992. 3.1 composite film a composite structure manufactured by adhesive bonding or extrusion lamination of at least two sheets of film, for example polyester film, aluminium foil or polyethylene film 3.2 tubular sack a container made from a w
27、eb formed by heat-sealing a longitudinal and bottom seam and closed after filling with a heat-sealed top seam 3.3 vacuum packed tubular sack a tubular sack from which the air is evacuated in order to protect the filling material and which is subsequently sealed hermetically 3.4 inert gas filled tubu
28、lar sack a tubular sack in which the air is replaced by inert gas,e.g.nitrogen plus carbon dioxide 3.5 heat-sealed seams longitudinal, bottom and top seams manufactured by heat-sealing the inner polyethylene ply 4 General characteristics 4.1 Construction 4.1.1 The tubular sacks shall be manufactured
29、 from a flat web of composite film wrapped around a roll, for example PET/Alu/PE, formed as a flat sack with a heat sealed longitudinal, bottom and top seam. 4.1.2 Tubular sacks shall be made of only one ply. 4.1.3 The aluminium foil inserted preferably as a protective layer shall be gas tight. 4.2
30、Dimensions 4.2.1 The dimensions of the tubular sacks shall be aligned with the dimensions of the surrounding packaging.EN 788:1994 4 BSI 12-1999 4.2.2 The dimensions and dimensional tolerances of the tubular sacks should be agreed upon by the purchaser and the supplier. 4.2.3 The dimensions and dime
31、nsional tolerances of the tubular sacks shall be recorded in the ordering documents. 4.2.4 The dimensions and the dimensional tolerances of the composite film roll lengths and roll widths shall depend on the specifications of the tubular sack machines and the size of the tubular sacks and be agreed
32、upon by the supplier and the composite film manufacturer. 4.2.5 Where printed composite film is to be processed, the lay-out and the position of the printing shall be agreed upon by the supplier and the composite film manufacturer. 4.2.6 Dimensions and dimensional tolerances of the lay-out and print
33、ing shall be recorded in the ordering documents. 4.2.7 The coefficient of sliding friction of the film shall comply with the specifications of the tubular sack machine and be agreed upon by the supplier and the composite film manufacturer and recorded in the ordering documents. 4.3 Food compatibilit
34、y 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 The composite film shall be sampled in accordance with ISO186:1985, where a roll of composite film shall be regard
35、ed as a packaging unit as shown in Table1 of ISO186:1985. 5.1.2 Tubular sacks shall be sampled in accordance with EN27023. At least 30units shall be sampled. 5.1.3 Samples shall be taken on the day that the empty tubular sacks are ready for dispatch at the suppliers. 5.1.4 If, as a result of an acci
36、dent during sampling or testing, resampling is necessary, a new sample shall be taken 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:
37、1986 condition G (temperature +23 C 2 C, relative humidity50% 5%). 5.2.2 The minimum 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 co
38、mmence within10min of conditioning. 5.3 Test date All tests shall be carried out within4weeks of the date that the tubular sacks are ready for dispatch at the suppliers. 5.4 Tests 5.4.1 Determination of the tensile stress at break and elongation at break of the composite film The tensile stress and
39、elongation at break in a longitudinal and transverse direction shall be determined in accordance with ISO1184:1983 using15mm wide test strips, with a gauge length of100mm and a testing speed of100mm/min, until total rupture of the composite film. 5.4.2 Adhesion of the composite film Adhesion in a lo
40、ngitudinal and transverse direction shall be determined between the outer and middle ply (e.g.PET/Alu) and between the inner and middle ply (e.g.Alu/PE) in accordance with ISO1184:1983 on15mm wide and200mm long test strips and a testing speed of100mm/min, the clamping of the test strip being in orde
41、r for the plies to be stressed to peel. From both longitudinal and transverse direction5test strips shall be taken. Before testing, the layers of which the adhesion are to be determined shall be separated over a length of at least40mm. When necessary a suitable solvent can be used which shall be rem
42、oved before testing. During the test the part of the composite film which is not separated shall be kept perpendicular to the direction of pull. 5.4.3 Oxygen permeability of the composite film The oxygen permeability shall be determined at23 C and50% relative humidity in accordance with ASTM D3985:8
43、1. 5.4.4 Heat sealed seam strength of tubular sacks The strength of the heat-sealed seams shall be determined using the tensile test described in ISO1184:1983 on15mm wide test strips, with a gauge length of50mm, a heat-sealed seam lying transversely to the direction of pull and in the middle of the
44、test strip, the clamping of the test strip being in order for the heat-sealed seam to be stressed to peel, and with testing speed of100mm/min.EN 788:1994 BSI 12-1999 5 5.5 Acceptance criteria NOTECompliance with the acceptance criteria for composite films may be proven by the supplier by means of a
45、certificate of materials testing in accordance with EN10204, established by the composite film manufacturer. 5.5.1 Tensile stress at break and elongation at break of the composite film Longitudinal and transverse tensile stress at break shall be at least50N/15mm. Longitudinal and transverse expansio
46、n at break shall be at least60%. 5.5.2 Adhesion of the composite film In a longitudinal and transverse direction between all layers of the composite film: at least200cN/15mm. 5.5.3 Oxygen permeability of the composite film Maximum value less than0,1cm 3 /(m 2 .24h). 5.5.4 Heat sealed seam strength o
47、f the tubular sacks All minimum values for all seams: greater than30N/15mm. 6 Marking If allowed, marking of the composite film or tubular sacks 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
48、 Standard and shall include at least the following 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 tubular sacks; e) results of the composite film tensile stress and elongation at br
49、eak tests, the mean value and the standard deviation; f) results of the adhesion test, mean value and minimum and maximum value for the separation test; g) results of the composite film oxygen permeability test; h) heat-sealed seam strength, mean value, maximum and minimum value; i) any deviations from the test methods specified in this standard; j) name and address of the tester; k) signature of the tester; l) date of test.6 blankBSEN 788:1994 BSI 12-1999 National annex NA (informative) Committees responsible The Unit
