《BS-EN-12702-2000.pdf》由会员分享，可在线阅读，更多相关《BS-EN-12702-2000.pdf（8页珍藏版）》请在三一文库上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12702:2000 The Euro
2、pean Standard EN 12702:2000 has the status of a British Standard ICS 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Adhesives for paper and board, packaging and disposable sanitary products Determination of blocking behaviour of potentially adhesive layers Licensed Cop
3、y: sheffieldun sheffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15
4、 April 2000 BSI 04-2000 ISBN 0 580 34591 2 BS EN 12702:2000 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN 12702:2000. The UK participation in its preparation was entrusted to Technical Committee PRI/52,
5、 Adhesives, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate th
6、em in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section en
7、titled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complianc
8、e 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, the EN title page, pages 2 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates wh
9、en the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050
10、Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12702:2000 E EUROPEAN STANDARDEN 12702 NORME EUROPE ENNE EUROPA ISCHE NORM January 2000 ICS 83.180 English version Adhesives for paper and board, packaging and disposabl
11、e sanitary productsDetermination of blocking behaviour of potentially adhesive layers Adhe sifs pour papier et carton, emballage et produits sanitaires jetables De termination du comportement au blocage de couches potentiellement adhe sives Klebstoffe fu r Papier, Verpackung und Hygieneprodukte Best
12、immung des Blockverhaltens von klebfa higen Schichten This European Standard was approved by CEN on 15 November 1999. 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 a
13、ny 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, German). A version in any other language made b
14、y 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ir
15、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12702:2000 BSI 04-2000 Foreword This European Standard has been prepared by Tec
16、hnical Committee CEN/TC 193, Adhesives, the Secretariat of which is held by AENOR. 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 July 2000, and conflicting national standards shall be withdrawn
17、at the latest by July 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
18、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Terms and definitions3 4Principle3 5Safety3 6Apparatus and materials3 7Test specimens4 8Conditioning4 9Procedure4 10Test report4 Licensed Copy: sheffieldun sh
19、effieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12702:2000 BSI 04-2000 1 Scope This European Standard specifies a method for the determination of blocking behaviour of thermoplastic or hygroscopic layers or coatings of potentially adhesive surfaces. Some poten
20、tially adhesive surfaces are both thermoplastic and hygroscopic. The method described provides a means for determining, on the same surface, both thermoplastic and hygroscopic blocking. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other pu
21、blications. 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 only when incorporated in it by amendment or revi
22、sion. For undated references the latest edition of the publication referred to applies. EN 923, Adhesives Terms and definitions. EN 1066, Adhesives Sampling. EN 1067, Adhesives Examination and preparation of samples for testing. 3 Terms and definitions For the purposes of this standard the following
23、 definitions, together with those given in EN 923, apply. 3.1 potentially adhesive surface surface in substantially non-adhesive state which may be activated to an adhesive state by heating, application of pressure or organic/aqueous based solvents 3.2 blocking adhesion between contacting surfaces o
24、f similar or dissimilar material, occurring during storage under the influence of time, pressure and temperature (thermoplastic blocking) or humidity (hygroscopic blocking) 3.3 cohesive blocking blocking of two identical, potentially adhesive surfaces 3.4 adhesive blocking blocking of a potentially
25、adhesive surface against another surface 3.5 first degree blocking adhesion between surfaces under test to such a degree that when the upper specimen is lifted, the lower specimen will cling to it but may be parted easily with no evidence of damage to either surface 3.6 second degree blocking adhesi
26、on of such a degree that when surfaces under test are parted one surface will be damaged 3.7 critical temperature lowest temperature at which blocking of a given degree occurs 3.8 critical humidity lowest humidity at which blocking of a given degree occurs 4 Principle Test specimens are placed face
27、to face between glass plates. The degree and type of blocking are determined. 5 Safety Persons using this standard shall be familiar with normal laboratory practice. This standard does not purport to address all the safety problems, if any, associated with its use. It is the responsibility of the us
28、er to establish safety and health practices and to ensure compliance with any European or national regulatory conditions. 6 Apparatus and materials 6.1 Oven, capable of maintaining temperatures up to within 85 8C 2 8C, and of sufficient size to hold one or more desiccators of the type described in 6
29、.2. Alternatively, a controlled humidity oven may be used. 6.2 Desiccators, to be used as humidity chambers, with a minimum internal diameter of 150 mm. The desiccators shall be made of glass, with ground flanges and fitting covers. Ground edges should be clean and well lubricated with stopcock grea
30、se. 6.3 Salts, for maintaining constant humidity conditions within the desiccators, as follows: a) Anhydrous calcium chloride (CaCl2), for low humidity. b) Salts, as given in Table 1, employed in saturated solution. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Unco
31、ntrolled Copy, (c) BSI Page 4 EN 12702:2000 BSI 04-2000 Table 1 Salts and relative humidity SaltRelative humidity over saturated solution at 38 8C, approximately % Sodium dichromate50 Sodium bromide54 Sodium nitrate62 Sodium acetate68 Sodium chloride75 Potassium chloride83 Ammonium monophosphate 91
32、NOTE A desiccator containing salt solution should be prepared and held at the designated temperature a sufficient time in advance of use to ensure humidity equilibrium within the desiccator. An excess of undissolved salt should be maintained throughout the period of testing. 6.4 Weights of 0,5 Kg, w
33、ith a flat base. 6.5 Glass plates, 40 mm by 40 mm and approximately 6 mm in thickness. 6.6 Filter paper, general usage, cut into 50 mm by 50 mm squares. NOTEIn cases where filter paper is deemed inadequate, a different paper, or material other than paper, can be used by agreement. 7 Test specimens 7
34、.1 Take the specimens from the material to be tested in accordance with EN 1066. Examine and prepare those specimens for testing in accordance with EN 1067. 7.2 Prepare the test specimens to conform closely with relevant commercial practice with respect to adhesive thickness, substrate and method of
35、 preparation. 7.3 Cut eighteen test specimens 60 mm 3 60 mm from suitable large specimens for each series of tests (six specimens for cohesive blocking tests and three specimens for adhesive blocking tests in both thermoplastic and hygroscopic blocking). 8 Conditioning 8.1 Condition the test specime
36、ns and filter paper for determining thermoplastic blocking in a desiccator over anhydrous calcium chloride at (38 1) 8C for 24 h. 8.2 Condition the test specimens and filter paper for determining hygroscopic blocking in a desiccator over the appropriate saturated salt solution at the humidity requir
37、ed at (38 1) 8C for 24 h. 9 Procedure 9.1 General For cohesive blocking, place three sets of two conditioned test specimens, edges aligned, adhesive face to adhesive face, on a glass plate (6.5). For adhesive blocking, prepare three sets of filter paper (6.6) superimposed on the adhesive face of con
38、ditioned test specimen and place them on a glass plate. Place a second glass plate on top and align the edges so that two edges of the test specimens are flush with the two edges of the glass plates. 9.2 Thermoplastic blocking Immediately place the test assemblies, with a 0,5 kg weight (6.4) on top
39、and in the centre of the glass plate, in a desiccator (6.2) over anhydrous calcium chloride 6.3 a) maintained at (38 2) 8C for 24 h in the oven (6.1). 9.3 Hygroscopic blocking Place the test assemblies, with a 0,5 kg weight on top and in the centre of the glass plate, in a desiccator maintained at a
40、pproximately 50 % relative humidity and at (38 2) 8C for 24 h in the oven (6.1). 9.4 Remove the test assemblies, allow to cool to room temperature, and examine promptly by manual separation of the layers, noting the degree of adhesion. Classify the thermoplastic or hygroscopic blocking as follows: 1
41、) no blocking; 2) first degree of blocking; 3) second degree of blocking; or 4) any other degree of blocking as agreed upon. 9.5 If the classification is no blocking, repeat the test with new specimens at successively higher temperatures (increments of 5 8C starting at 45 8C up to a maximum of 85 8C
42、 2 8C) for thermoplastic blocking, or successively higher humidities (increments shown for the salts in Table 1 at 38 8C) for hygroscopic blocking until first or second or other degree of blocking is found, or until a suitable high temperature or humidity is reached. 10 Test report The test report s
43、hall include: a) complete identification of the adhesive layer tested, including thickness or weight per unit area, and method of application to the substrate, if any; b) any alternative to filter paper employed in 6.6; c) type of blocking determined (see 9.1 or 9.2); d) class of blocking (see 9.4);
44、 e) results of all determinations made, including: for thermoplastic blocking, the critical temperature or the highest temperature employed; for hygroscopic blocking, the critical humidity or the highest humidity employed; any other critical phenomena; f) date of test. Licensed Copy: sheffieldun she
45、ffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12702:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | |
46、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing B
47、ritish Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It
48、is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside fron
49、t cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless