1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12024 : 1997 The Eu
2、ropean Standard EN 12024 : 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 resistance to elevated temperature and humidityBS EN 12024 : 1997 This British Standard, having been prepared unde
3、r 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 February 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference PKW/3 Draft for comment 92/43827 DC IS
4、BN 0 580 26795 4 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 following
5、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 R
6、etail 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 Cranfield Logistics Depart
7、ment of Transport 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 Nation
8、al Association of 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 Softwo
9、od Sawmillers Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Adhesive Tape Manufacturers Association British Footwear Manufacturers Federation British Steel Industry (Wire Section) Packaging Distributors Association Pressure
10、Sensitive Manufacturers AssociationBS EN 12024 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 12024 3ii BSI 1997 BS EN 12024 : 1997 National foreword This British Standard has been prepared by Technical Committee PKW/3 and is the
11、English language version of EN 12024 : 1996 Self adhesive tapes Measurement of resistance to elevated temperature and humidity, published by the European Committee for Standardization (CEN). Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of page
12、s This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, 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
13、 1996 Copyright reserved to CEN members Ref. No. EN 12024 : 1996 E EUROPEAN STANDARD EN 12024 NORME EUROPE ENNE EUROPA ISCHE NORM May 1996 ICS 83.180 Descriptors: Adhesive tapes, thermal tests, high temperature tests, damp heat tests English version Self adhesive tapes Measurement of resistance to e
14、levated temperature and humidity Rubans auto-adhe sifs Mesure de la tenue a tempe rature et humidite e leve es Klebeba nder Messung der Besta ndigkeit gegen erho hte Temperaturen und Luftfeuchtigkeit This European Standard was approved by CEN on 1996-04-19. CEN members are bound to comply with the C
15、EN/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 standards may be obtained on application to the Central Secretariat or t
16、o 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 notified to the Central Secretariat has the same status as the official version
17、s. 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 United Kingdom.Page 2 EN 12024 : 1996 BSI 1997 Foreword This European Standard has been
18、prepared by 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 November 1996, and conflicting national
19、standards shall be withdrawn at the latest by November 1996. According to the CEN/CENELEC International Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, N
20、orway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Principle 3 3 Reagents 3 4 Apparatus 3 5 Test samples 3 6 Procedure 3 7 Expression of results 3 8 Test report 4Page 3 EN 12024 : 1996 BSI 1997 1 Scope This standard specifies a method to obtain a
21、n indication of the behaviour of the adhesive tape under specified conditions of elevated temperature and high humidity. 2 Principle The roll of adhesive tape is placed in an enclosure maintained at an elevated temperature and a high humidity for a sufficient period and the effect, if any, on the ph
22、ysical or chemical properties of the roll of adhesive tape mass is observed. 3 Reagents Aqueous solution of glycerol of the following composition: 100 g of aqueous solution shall contain 46 g of glycerol. Specified gravity at 23 C shall be approximately 1,17 and the refractive index (sodium D line)
23、shall be approximately 1,392. 0,1 % by weight of copper sulphate shall be added to the solution to avoid mould growth. (For example, 4 drops of a saturated copper sulphate solution for every 100 ml of aqueous glycerol solution). 4 Apparatus 4.1 Desiccator The desiccator shall have an internal diamet
24、er of at least 300 mm and shall be constructed of material inert to copper sulphate. The lower part shall contain the aqueous solution of glycerol. The solution used is intended to maintain relative humidity of 85 % 2%i n the desiccator at the test temperature. The level of the aqueous glycerol solu
25、tion shall be at least 20 mm below the level of the perforated plate. The desiccator shall not be left open longer than is necessary during insertion of the samples, so as not to cause a reduction in the level of the humidity during the test below that specified. 4.2 Air circulating oven The oven sh
26、all be so constructed that the desiccator can stand in a region of the oven where the temperature can be maintained uniformly at 40 C 2Co r6 5C 2 C. 4.3 A humidity cabinet giving the above conditions may be used in place of 4.1 and 4.2. 5 Test samples Commercial rolls of adhesive tape, preferably 25
27、 mm wide and at least 9 m long, shall be taken as samples. The rolls are tested as received. Rewound rolls shall not be used. 6 Procedure 6.1 Standard test conditions The test shall be carried out at either of the temperatures specified in 6.3 and at 85 % 2 % relative humidity. (At the conclusion of
28、 the test period rolls will be return to 23 C 2 C and 50 % 5 % relative humidity). 6.2 Positioning in desiccator and oven Place the rolls horizontally on the perforated plate but not touching each other. Place the desiccator (without lid) in the oven. Allow the temperature to reach equilibrium befor
29、e closing the desiccator. Ensure that the closure of the desiccator is air-tight. 6.3 Temperature and duration of test Set the oven at either 40 C 2Co r6 5C 2 C. The test shall be carried out at either of the above temperatures for seven days, unless otherwise stated in the specification sheets. 6.4
30、 Observation of changes 6.4.1 Visual examination shall be made two hours after completion of the test during which period the roll shall have been placed in the standard atmosphere of 23 C 2 C and 50 % 5 % relative humidity. All apparent changes which are noticeable should be noted, particularly tel
31、escoping, distortion, air bubbles, etc. 6.4.2 The experimental examination will be carried out by unwinding the roll radially at a speed of approximately 300 mm/s. After elimination of the first three turns of adhesive tape any breakage, twisting, adhesive offsetting which occurs is reported, as als
32、o is delamination in the case of paper adhesive tapes. Depending on the use to which the adhesive tape is to be applied, further testing may be carried out by measuring properties such as peel adhesion, tangential adhesive power, unwind force, etc. The corresponding test methods shall be used, and i
33、t is advisable to compare the values obtained both before and after exposure, to overcome errors of personal judgment. 7 Expression of results 7.1 The following exposure conditions shall be recorded: temperature selected and duration of test, if this differs from 7 days. 7.2 Record visual observatio
34、ns made at the end of the 2 h cooling period in the standard atmosphere. 7.3 Observations made during the unrolling test. 7.4 The results of tests carried out both before and after exposure where additional optional tests methods are performed.Page 4 EN 12024 : 1996 BSI 1997 8 Test report The test r
35、eport shall include the following information: a) a reference to this European Standard; b) all information necessary to identify the test sample; c) the exposure conditions: temperature selected and duration of test, if this differs from 7 days; d) the date of the test; e) the results of the observ
36、ations and supplementary test data if applicable; f) if desiccator or humidity chamber used for the tests; g) any operation not specified in this European Standard, which may influence the results.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
37、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing Britis
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