1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12023 : 1997 The Eu
2、ropean Standard EN 12023 : 1996 has the status of a British Standard ICS 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Self adhesive tapes Measurement of water vapour transmission in a warm humid atmosphereBS EN 12023 : 1997 This British Standard, having been prepared
3、 under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference PKW/3 Draft for comment 92/42616 DC
4、ISBN 0 580 27134 X Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PKW/3, Distribution packaging, transport packaging and unit loads, upon which the followin
5、g bodies were represented: British Adhesives and Sealants Association British Apparel and Textile Confederation British Coatings Federation Ltd. British Fibreboard Packaging Association British Glass Manufacturers Confederation British Industrial Truck Association British Plastics Federation British
6、 Retail Consortium British Rubber Manufacturers Association Ltd. British Tensional Strapping Association Ltd. British Timber Merchants Association British Wood Preserving and Damp-proofing Association Chamber of Shipping Chemical Industries Association China Clay Association Department of Transport
7、Engineering Equipment and Materials Users Association Federation of the Electronics Industry Flexible Ibc Association Food and Drink Federation Independent Pallet Repair Committee Institute of Grocery Distribution Metal Packaging Manufacturers Association Ministry of Defence National Association of
8、Pallet Distributors Power Fastenings Association Pira International Road Haulage Association Ltd. Society of Occupational Medicine Storage Equipment Manufacturers Association Timber Packaging and Pallet Confederation Timber Research and Development Association United Kingdom Softwood Sawmillers Asso
9、ciation The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Adhesive Tape Manufacturers Association British Footwear Manufacturers Federation Packaging Distributers Association Pressure Sensitive Manufacturers AssociationBS EN 12023 : 1997 BS
10、I 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 12023 3ii BSI 1997 BS EN 12023 : 1997 National foreword This British Standard has been prepared by Technical Committee PKW/3 and is the English language version of EN 12023 : 1996 Self adhesiv
11、e tapes Measurement of water vapour transmission in a warm humid atmosphere, published by the European Committee for Standardization (CEN). Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, inside fro
12、nt cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 12
13、023 : 1996 E EUROPEAN STANDARD EN 12023 NORME EUROPE ENNE EUROPA ISCHE NORM August 1996 ICS 83.180 Descriptors: Adhesive tapes, tests, vapour transmission, water vapour, fluid-tightness tests, damp heat tests English version Self adhesive tapes Measurement of water vapour transmission in a warm humi
14、d atmosphere Rubans auto-adhe sifs Mesure de la transmission de vapeur deau en atmosphe re chaude et humide Klebeba nder Messung der Wasserdampfdurchla ssigkeit in feuchtwarmer Atmospha re This European Standard was approved by CEN on 1996-07-19. CEN members are bound to comply with the CEN/CENELEC
15、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 obtained on application to the Central Secretariat or to any CEN m
16、ember. 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 Secretariat has the same status as the official versions. CEN memb
17、ers are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12023 : 1996 BSI 1997 Foreword This European Standard has been prepared by
18、 Technical Committee CEN/TC 253, Self adhesive tapes, the secretariat of which is held by AFNOR. 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 February 1997, and conflicting national standards s
19、hall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lu
20、xembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European standard gives: Annex A (normative) Measurement of water vapour transmission in a warm humid atmosphere for adhesive tape less than 50 mm width; Annex B (informative) Bibliography. Contents Page
21、 Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Principle 3 5 Materials 3 6 Apparatus 3 7 Test sample and test pieces 4 8 Procedure 4 9 Expression of results 5 10 Test report 5 Annexes A (normative) Self adhesive tape: measurement of water vapour transmission in a warm humid atmosphe
22、re for adhesive tape of less than 50 mm width 6 B (informative) Bibliography 8 Figure 1 Dry box 4Page 3 EN 12023 : 1996 BSI 1997 1) It is recommended to roughen the testing surface with Nr 240 Type FEPA abrasive grit (see annex B). This information is given for the convenience of users of this stand
23、ard and does not constitute an endorsement by CEN of this product type. 1 Scope This standard specifies the method to determine the mass of the water vapour transmitted through the adhesive tape under specific test conditions. Details of the test method depend upon the width of the adhesive tape und
24、er test. For adhesive tapes less than 50 mm width it is necessary to use annex A (normative). When test pieces below 50 mm wide are used (as will be common) together with the smaller dry box the precision of this test may be reduced due to undesired moisture transmission at the adhesive seal. This p
25、art of the method should therefore be considered to give only approximate values. 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 text and the publicati
26、ons 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 applies. ISO 483 Plastics
27、 Small enclosures for conditioning and testing using aqueous solutions to maintain relative humidity at constant value ISO 3310-1 Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth 3 Definition For the purposes of this standard the following definition applies. wa
28、ter vapour transmission rate The mass of water vapour passing through a unit area of adhesive tape in unit time under prescribed conditions of humidity and temperature. 4 Principle The adhesive tape is used to separate the humid atmosphere of relative humidity of 93 % 2 % contained in an outer vesse
29、l from the dry atmosphere contained in a metal box, the adhesive side of the adhesive tape facing the dry atmosphere. The increase in mass of the contents of the metal box due to the passage of the water vapour through the adhesive tape is measured. The water vapour transmission of the adhesive tape
30、 is expressed as an increase in mass of the box assembly per unit of time per unit area of the opening in the box for a given period of exposure of the test piece to water vapour. 5 Materials 5.1 External humid atmosphere The relative humidity of 93 % 2 % shall be produced: either in the outer conta
31、iner by means of a saturated aqueous solution of ammonium dihydrogen phosphate (NH 4 H 2 PO 4 ) as ISO 483; or by means of a humidity cabinet. 5.2 Dry boxes The dry atmosphere within the box shall be produced by means of pure anhydrous calcium chloride (CaCl 2 ) of a fineness in accordance with the
32、following specifications, in accordance with ISO 3310-1; the particles shall be able to pass through a 2 mm sieve but not pass through a 600mm sieve. 5.3 Test solution for dry box Two percent solution of methylene blue in ethanol. 5.4 Cleaning solvent Toluene, general purpose chemical grade. 6 Appar
33、atus 6.1 Dry box, (see figure 1) shall conform to the following requirements: It shall be constructed from a non-ageing, non-corrodible material which does not absorb moisture. It shall consist of an open box of rectangular section topped by a perfectly flat, rigid stainless steel plate, having a ce
34、ntral rectangular opening of 100 mm3 25 mm. The overall dimensions of the plate shall be 140 mm3 65 mm. The internal dimensions of the box shall be 100 mm3 25 mm3 20 mm. The assembly shall be rigid. The plate shall be roughened with abrasive grit 1) the direction of the abrasion lines being parallel
35、 to the long dimension of the opening. The total mass of the box shall not exceed 150 g. The box shall be air-tight except for the 100 mm3 25 mm opening.Page 4 EN 12023 : 1996 BSI 1997 65 25 140 100 20 Dimensions in mm Figure 1. Dry box This should be checked frequently, for example by one of the me
36、thods given below: apply compressed air at a pressure of the order of 300 kPa to the opening in such a manner that leakage of air does not occur. Immerse the assembly in water and locate any leaks by the escape of air bubbles; fill the box with a 2 % solution of methylene blue in ethanol. After stan
37、ding for 24 h, examine the outside of the box for the presence of blue streaks indicating the position of leaks. 6.2 Container for outer humid atmosphere This container shall entirely surround the dry box. Its freedom from leakages shall be such that the humidity can be maintained constant for the d
38、uration of the test. It shall consist of a closed container within which a relative humidity of 93 % 2 % (see 5.1) shall be maintained at the temperature of test. The interior volume of the container shall be three to five times greater than that of the total volume of the dry boxes within it. Care
39、shall be taken to prevent condensation of water vapour on or near the dry boxes. 6.3 Analytical balance Sensitivity 0,1 mg. 6.4 Oven The external container containing the dry boxes shall be placed in an oven at 38 C 2 C. 6.5 Polished cylindrical metal roller This shall have a diameter of at least 50
40、 mm and a mass corresponding to 2 kg/cm width of the adhesive tape under test. 7 Test sample and test pieces Condition the sample roll for 24 h at 23 C 2C and 50 % 5 % relative humidity. Discard the three outer turns of adhesive tape from the roll before taking test pieces. Perform the test on three
41、 test pieces from each roll. Each test piece shall be at least 50 mm wide and more than 150 mm long. Narrower widths to a minimum of 15 mm may be used following the procedure in annex A. Note that further test pieces may be required (see 8.4). 8 Procedure 8.1 Standard test conditions The test shall
42、be carried out at 23 C 2C and 50 % 5 % relative humidity, and at 38 C 2 C and 93 % 2 % relative humidity. 8.2 Preparation of apparatus 8.2.1 Keep the empty dry box in the standard atmosphere until it is required. Clean the top plate with cotton wool soaked in toluene, and dry the plate. Fill the box
43、 evenly up to about 3 mm from the top with calcium chloride (5.2). Take care that the box is not inverted or tilted in subsequent operations. 8.2.2 Condition the box for 30 min at 38 C 2 C, then remove. 8.2.3 Immediately place the box on a rigid supporting jig so that the overhanging ends of the top
44、 plate rest on the jig. The construction of this jig shall be such that it is capable of supporting, firmly, the overhanging ends of the top plate without being distorted by the pressure exerted during the subsequent application of the test piece to the top plate.Page 5 EN 12023 : 1996 BSI 1997 The
45、object of this is to ensure that the plate does not bend during application of the test piece and that the closure of the box, effected by means of the test piece, is complete. Carefully apply the test piece along the major axis of the box in such a way that there is at least 12,5 mm of the test pie
46、ce beyond each edge of the opening. To ensure good contact between test piece and plate, smooth down with the finger, then pass the roller five times to and fro along the test piece. Cut off the surplus length of test piece flush with the edges of the plate, taking care not to disturb or lift the ed
47、ges. 8.3 Preliminary conditioning Place the prepared box assembly in the outer container at 93 % 2 % relative humidity and place the outer container in the oven at 38 C 2 C for 24 h, taking care to close the outer container completely. Alternatively place the prepared box assembly in the humidity ca
48、binet under the same conditions. At the end of this period, remove the box, wipe carefully and place for 30 min in the standard atmosphere of 23 C 2 C and 50 % 5 % relative humidity. Measure tare (T) of the box by means of an analytical balance in the standard atmosphere, to the nearest 0,1 mg. 8.4
49、Exposure to humid atmosphere The actual exposure test shall be carried out as follows: Immediately after the above tare mass determination, return the box to the humid atmosphere. Close the outer container completely and place this in the oven for the appropriate period as follows. For adhesive tapes with water vapour transmission of 50 g/m 2 or more in 24 h, the exposure shall be for 48 h. For adhesive tapes with water vapour transmission less than 50 g/m 2 in 24 h, the ex
