1、BRITISH STANDARD BS1683:1987 Specification for Coated aluminium foil for wrapping processed cheese UDC669.715.056.9-416:621.798.156:637.35BS1683:1987 This British Standard, having been prepared under the directionof the Packaging andFreight Containers StandardsCommittee, was published under the auth
2、ority ofthe Board of BSI and comes intoeffect on 28August1987 BSI09-1999 First published December1950 First revision November1967 Second revision August1987 The following BSI references relate to the work on this standard: Committee reference PKM/571 Draft for comment86/36892DC ISBN 0 580 16052 1 Co
3、mmittees responsible for this British Standard The preparation of this British Standard was entrusted by the Packaging and Freight Containers Standards Committee (PKM/-) to Technical CommitteePKM/571, upon which the following bodies were represented: Aluminium Federation Association of Butter and Ch
4、eese Packers Association of Cheese Processors Association of the British Pharmaceutical Industry British Aluminium Foil Rollers Association British Paper and Board Industry Federation (PIF) British Plastics Federation Coated Paper and Board Makers Association Department of Health and Social Security
5、 Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Flexible Packaging Association Food and Drink Federation Her Majestys Stationery Office Institute of Purchasing and Supply Milk Marketing Board Ministry of Defence PIRA Packaging and In
6、dustrial Films Association Retail Bag Manufacturers Association Society of Dairy Technology Sterilisation Packaging Materials Association Amendments issued since publication Amd. No. Date of issue CommentsBS1683:1987 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1
7、 Scope 1 2 Materials and manufacture 1 3 Performance 1 4 Sampling for acceptance inspection purposes 1 5 Marking 1 Appendix A Method for the determination of thickness of aluminium foil 2 Appendix B Method for the determination of the number of perforations 2 Appendix C Tests for resistance to corro
8、sion 2 Figure 1 Apparatus for the determination of the number of perforations 3 Figure 2 Former for dish test 4 Table 1 Tolerances on nominal width 1 Table 2 Sampling of rolls from a lot 1 Publications referred to Inside back coverBS1683:1987 ii BSI 09-1999 Foreword This revision of BS1683 has been
9、prepared under the direction of the Packaging and Freight Containers Standards Committee following the transfer of responsibility for BS1683 from the Dairying Industry Standards Committee. BS1683:1967 is withdrawn. This revision recognizes improvements which have taken place in manufacturing techniq
10、ues by setting tighter limits on the permitted number of perforations, and incorporates requirements for heat sealing properties and nominal width tolerance. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for thei
11、r correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular, attention is drawn to the Materials and Articles in Contact with Foodstuffs Regulations,1978 (S.I.1927). Summary of pages This document comprises a front cover, an insi
12、de front cover, pagesi andii, pages1 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 inside front cover.BS1683:1987 BSI 09-1999 1 1 Scope This British Standa
13、rd specifies material and performance requirements for aluminium foil of0.012mm or0.015mm nominal thickness, having a flexible protective coating, capable of being heat-sealed, on both sides, supplied in rolls for the wrapping of processed cheese, pasteurized cheese and pasteurized cheese spreads. N
14、OTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Materials and manufacture 2.1 Material The chemical composition of the uncoated foil shall be that applicable to material1200 of BS1470. NOTEThe chemical composition of the flexible protective coati
15、ng is not specified since this will be dependent on the material to be wrapped and the temperature conditions during storage and use. 2.2 Dimensions and tolerances 2.2.1 Thickness. The nominal thickness of the uncoated foil shall be either0.012mm or0.015mm. The permissible tolerance on the nominal t
16、hickness shall be 10% when the average thickness is determined as described inAppendix A. 2.2.2 Width. The permissible tolerance on the nominal width of the coated foil shall be as given inTable 1. Table 1 Tolerances on nominal width 2.3 Limits of perforation When tested by the method described in A
17、ppendix B, the number of perforations shall not exceed the following. 150 per square metre for foil of0.012mm nominal thickness 50 per square metre for foil of0.015mm nominal thickness The term “perforation” refers to minute holes which are visible as points of light only when the foil is viewed as
18、described inAppendix B. There shall be no holes other than those referred to above. 3 Performance 3.1 Resistance to corrosion 3.1.1 When tested as described inC.2, there shall be no visible corrosion except at the edges of the test specimen. 3.1.2 When tested as described inC.3, there shall be no le
19、akage of the test solution through the foil. 3.2 Heat seal performance When not less than3 test specimens, prepared and bonded in accordance with BS5350-C12, using a pressure of98kPa applied at70 C for10s, are tested in accordance with BS5350-C12, the arithmetic mean of the average peeling force sha
20、ll not be less than4N. 4 Sampling for acceptance inspection purposes For acceptance inspection purposes, select rolls from the lot in accordance withTable 2. Remove any damaged layers from the outside of each roll selected, discard also the first metre of the roll and then cut sufficient foil to pro
21、vide the test specimens required for the specified tests. Table 2 Sampling of rolls from a lot 5 Marking The wrapping and core of each roll shall be legibly marked with the following: a) the manufacturers name and/or trademark; b) the manufacturers identification/reference number; c) the nominal thi
22、ckness of the uncoated foil; d) the number and year of this British Standard, i.e.BS1683:1987 1) . Nominal width Width tolerance mm u 300 300 mm 0.5 1 Sizes of lot, n Number of rolls selected Method of selection No. of rolls 1to 5 6to 99 100to399 400or more All 5 a 20 At random At random At random a
23、 In determining the number of rolls to be selected, ignore any remainder of less than20units. 1) Marking BS1683:1987 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore sol
24、ely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the appropriate certification body. n 20 -BS1683:1987 2 BSI 09-1999 Appendix A Method for the determination of thickness of aluminium foil A.1 Take a crea
25、se-free sample of about100cm 2and measure its area accurately. Cut the sample into pieces of convenient size to remove the coating. Place them in the extraction thimble of a Soxhlet extractor fitted with a condenser and connect the Soxhlet extractor to a round-bottom flask containing a suitable solv
26、ent (see note, below), and boil for10min. Allow the apparatus to cool, remove the sample pieces, press them between blotting paper, warm to expel the last traces of solvent, cool and weigh to constant mass, to the nearest0.5mg. NOTEAcetone or butanone are usually satisfactory solvents but other solv
27、ents may be employed. A.2 Calculate the thickness of the foil. For this purpose2.71g/cm 3shall be used as the density of aluminium. Appendix B Method for the determination of the number of perforations B.1 Apparatus A suitable form of apparatus is shown inFigure 1. Mount a40watt pearl or opal electr
28、ic bulb in a wooden box175mm long,125mm wide and100mm deep. Across the top of the box place a piece of ground or opal glass, and6mm above it a piece of clear glass, the box and the space between the two sheets of glass being ventilated. Fold a sheet of dark coloured opaque paper,500mm 300mm in size,
29、 to form a double sheet250mm 300mm. Cut a rectangular hole in the centre of the double sheet, the side at right angles to the folded edge of the paper being12mm less in length than the width of the foil strip to be examined, and the other side being50mm. Fold the paper over the top and two sides of
30、the box and secure it by means of elastic bands as shown in Figure 1, a piece of paper being cut away if necessary to clear the electric cable lead-in. Use the apparatus in a dark room with the lamp turned on. B.2 Procedure Discard the first metre of the roll and examine not less than1m. Attach the
31、coated foil to be examined to a piece of stiff paper threaded between the two layers of opaque paper, and draw it through intermittently,40mm at a time, so as to close the illuminated window. The perforations may easily be seen and counted. The number of perforations per square metre shall be calcul
32、ated from the number observed, the length of strip examined, and the width of the illuminated window. Appendix C Tests for resistance to corrosion C.1 Reagents Reagents shall be a general laboratory grade purity. Acid test solution.1g of copper sulphate pentahydrate and5mL of concentrated hydrochlor
33、ic acid, of density1.18g/cm 3 , made up to100mL with distilled water. C.2 Corrosion test C.2.1 Procedure Discard the first metre of the roll then cut a flat sheet of the coated foil not less than100cm 2in area. Float the sheet, with the surface to be in contact with the cheese downwards on the surfa
34、ce of the acid test solution. At the end of30min examine the sheet with the naked eye for visible corrosion. C.2.2 Test report Report the presence or absence of corrosion and if present its position. C.3 Dish test C.3.1 Apparatus The apparatus shall comprise the following. a) A piece of polyurethane
35、 foam, at least125mm long,125mm wide and76mm thick. b) A polished rectangular former75mm long and30mm wide and at least25mm deep, with the edges and corners radiused with a radius of5mm, provided with a centrally fixed handle (seeFigure 2). C.3.2 Procedure Discard the first metre of the roll, and th
36、en cut a piece of coated foil100mm square. If the reel is less than100mm wide, cut a piece100mm long by the full reel width. Place the piece of coated foil, with the side to be tested uppermost, on top of the piece of polyurethane foam and place the rectangular former centrally on top of the foil. U
37、sing the handle, push the rectangular former down into the foam using a force not so great as to completely compress it. The foil forms a dish round the rectangular former which is then removed. Partly fill the formed dish with the acid test solution. After30min examine the dish for evidence of leak
38、age of the test solution through the foil. C.3.3 Test report Report the presence or absence of leakage. BS1683:1987 BSI 09-1999 3 Figure 1 Apparatus for the determination of the number of perforationsBS1683:1987 4 BSI 09-1999 Figure 2 Former for dish testBS1683:1987 BSI 09-1999 Publications referred
39、 to BS1470, Specification for wrought aluminium and aluminium alloys for general engineering purposes plate, sheet and strip. BS5350, Methods of test for adhesives. BS5350-C12, 180 “T” peel test for a flexible-to-flexible assembly. BS1683:1987 BSI 389 Chiswick High Road London W4 4AL BSIBritishStand
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