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 layersThis British
3、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 April 2000 BSI 04-2000 ISBN 0 580 34591 2 BS EN 12702:2000 Amendments issued since publication Amd. No. Dat
4、e Comments 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, Adhesives, which has the responsibility to: aid enquirers to understand the text; present to the responsi
5、ble 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 them in the UK. A list of organizations represented on this committee can be obtained on request to its secr
6、etary. 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 entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standard
7、s 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages
8、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 when the document was last issued.CEN European Committee for Standardization Comite Europe en de Normali
9、sation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 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 STANDARD EN 12702 NORME EUROPE ENNE EUROPA ISCHE NORM Jan
10、uary 2000 ICS 83.180 English version Adhesives for paper and board, packaging and disposable sanitary products Determination 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 co
11、uches potentiellement adhe sives Klebstoffe fu r Papier, Verpackung und Hygieneprodukte Bestimmung 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
12、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 member. This European Standard exists
13、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 members are the national standards bodies
14、 of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12702:2000 BSI 04-2000 Foreword This European Standard has been prepared by Technical Committee
15、 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 at the latest by
16、 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, Luxembourg, Netherlands,
17、 Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions 3 4 Principle 3 5 Safety 3 6 Apparatus and materials 3 7 Test specimens 4 8 Conditioning 4 9 Procedure 4 10 Test report 4Page 3 EN 12702:2000 BSI
18、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 potentially adhesive surfaces are both thermoplastic and hygroscopic. The method described provides a means
19、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 publications. These normative references are cited at the appropriate places in the text and the publicat
20、ions 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. EN 923, Adhesiv
21、es 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 definitions, together with those given in EN 923, apply. 3.1 potentially adhesive surface surface in s
22、ubstantially 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 of similar or dissimilar material, occurring during storage under the influence of time, pressure and te
23、mperature (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 adhesive surface against another surface 3.5 first degree blocking adhesion between surfaces under test
24、 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 adhesion of such a degree that when surfaces under test are parted one surface will be damaged 3.7 critical t
25、emperature 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 to face between glass plates. The degree and type of blocking are determined. 5 Safety Persons using th
26、is 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 user to establish safety and health practices and to ensure compliance with any European or national regu
27、latory conditions. 6 Apparatus and materials 6.1 Oven, capable of maintaining temperatures up to within 858C 28C, and of sufficient size to hold one or more desiccators of the type described in 6.2. Alternatively, a controlled humidity oven may be used. 6.2 Desiccators, to be used as humidity chambe
28、rs, 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 grease. 6.3 Salts, for maintaining constant humidity conditions within the desiccators, as follows: a) Anhydr
29、ous calcium chloride (CaCl 2 ), for low humidity. b) Salts, as given in Table 1, employed in saturated solution.Page 4 EN 12702:2000 BSI 04-2000 Table 1 Salts and relative humidity Salt Relative humidity over saturated solution at 388C, approximately % Sodium dichromate 50 Sodium bromide 54 Sodium n
30、itrate 62 Sodium acetate 68 Sodium chloride 75 Potassium chloride 83 Ammonium monophosphate 91 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 u
31、ndissolved salt should be maintained throughout the period of testing. 6.4 Weights of 0,5 Kg, with 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. NOTE In cases where filter paper is deemed inadequat
32、e, a different paper, or material other than paper, can be used by agreement. 7 Test specimens 7.1 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 close
33、ly with relevant commercial practice with respect to adhesive thickness, substrate and method of preparation. 7.3 Cut eighteen test specimens 60 mm3 60 mm from suitable large specimens for each series of tests (six specimens for cohesive blocking tests and three specimens for adhesive blocking tests
34、 in both thermoplastic and hygroscopic blocking). 8 Conditioning 8.1 Condition the test specimens 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 hygroscopi
35、c blocking in a desiccator over the appropriate saturated salt solution at the humidity required 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 adhesiv
36、e blocking, prepare three sets of filter paper (6.6) superimposed on the adhesive face of conditioned 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 The
37、rmoplastic blocking Immediately place the test assemblies, with a 0,5 kg weight (6.4) on top 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
38、a 0,5 kg weight on top and in the centre of the glass plate, in a desiccator maintained at approximately 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, noti
39、ng the degree of adhesion. Classify the thermoplastic or hygroscopic blocking as follows: 1) 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 su
40、ccessively higher temperatures (increments of 58C starting at 458Cu pt o a maximum of 858C 28C) for thermoplastic blocking, or successively higher humidities (increments shown for the salts in Table 1 at 388C) for hygroscopic blocking until first or second or other degree of blocking is found, or un
41、til a suitable high temperature or humidity is reached. 10 Test report The test report shall 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
42、in 6.6; c) type of blocking determined (see 9.1 or 9.2); d) class of blocking (see 9.4); 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
43、 employed; any other critical phenomena; f) date of test.blankBS EN 12702:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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