1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12703:2012Adhesives for paper andboard, packaging anddisposable sanitary products Determination of lowtemperature flexibility or coldcrack temperatureBS EN 12703:2012 BRITI
2、SH STANDARDNational forewordThis British Standard is the UK implementation of EN 12703:2012. Itsupersedes BS EN 12703:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can beobta
3、ined on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 75588 0ICS 83.180Compliance with a B
4、ritish Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationDate Text affectedBS EN 12703:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM E
5、N 12703 March 2012 ICS 83.180 Supersedes EN 12703:1999English Version Adhesives for paper and board, packaging and disposable sanitary products - Determination of low temperature flexibility or cold crack temperature Adhsifs pour papier, carton, emballage et produits sanitaires jetables - Dterminati
6、on de la flexibilit basse temprature ou de la temprature de fissuration froid Klebstoffe fr Papier, Verpackung und Hygieneprodukte - Bestimmung des Kaltbruchverhaltens oder der Kaltbruchtemperatur This European Standard was approved by CEN on 5 February 2012. CEN members are bound to comply with the
7、 CEN/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 CEN-CENELEC Management
8、 Centre or to 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 CEN-CENELEC Management Centre has the same status a
9、s the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Ro
10、mania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means
11、 reserved worldwide for CEN national Members. Ref. No. EN 12703:2012: EBS EN 12703:2012EN 12703:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Apparatus .46 Test specimens 56.1 Sampling .56.2 Dimensions .56.3 Preparation of the adhesive f
12、ilm 57 Conditioning .67.1 Preliminary conditioning .67.2 Conditioning .68 Procedure .68.1 Pass/fail test .68.2 Determination of cold crack temperature .79 Expression of results 79.1 Pass/fail test .79.2 Cold crack temperature .710 Test report 7BS EN 12703:2012EN 12703:2012 (E) 3 Foreword This docume
13、nt (EN 12703:2012) has been prepared by Technical 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 September 2012, and c
14、onflicting national standards shall be withdrawn at the latest by September 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This
15、 document supersedes EN 12703:1999. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to estab
16、lish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the material permitted in this European Standard may have negative environmental impact. As technological advantages lead to acceptable alternat
17、ives for these materials, they will be as far as possible eliminated from this European Standard. At the end of the test, the user of this European Standard should take care to carry out an appropriate disposal of the wastes, according to local regulation. According to the CEN/CENELEC Internal Regul
18、ations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Mal
19、ta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12703:2012EN 12703:2012 (E) 4 1 Scope This European Standard specifies a method to determine whether a film of adhesive of given dimensions will craze, crack or fr
20、acture at a specified temperature. Alternatively, the temperature at which the film will craze, crack or fracture can be determined. The method described can be used either as a quality control test or to compare the flexibility of adhesives at low temperatures. 2 Normative references The following
21、documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 923, Adhesives Ter
22、ms and definitions EN 1067, Adhesives Examination and preparation of samples for testing EN ISO 15605, Adhesives Sampling (ISO 15605) ISO 554, Standard atmospheres for conditioning and/or testing Specifications 3 Terms and definitions For the purposes of this document, the terms and definitions give
23、n in EN 923 apply. 4 Principle An unsupported film of the adhesive, after conditioning, is bent through 180 over specified diameter cylindrical mandrel. The test piece is then examined for signs of fracture, crazing or cracking. The test may be carried out either as a pass/fail test or at successive
24、ly lower temperatures until a failure occurs. 5 Apparatus 5.1 Bend test apparatus, as shown in Figure 1. The mandrel shall be made of rigid and suitably corrosion-resistant material, e.g. stainless steel. BS EN 12703:2012EN 12703:2012 (E) 5 Key 1 stop of identical height to mandrel 2 mandrel 3 mandr
25、el pin Figure 1 Bend test apparatus The diameter of the mandrel shall be (6,0 0,1) mm and the gap between the surface of the mandrel and the plates of the hinge shall be (0,55 0,1) mm. Other dimensions of the apparatus are not critical. The mandrel shall be free to rotate on its pin and the apparatu
26、s shall be provided with a stop to ensure that when the test piece is bent, the two plates of the hinge are parallel. 5.2 Chamber, capable of maintaining a specified temperature to an accuracy of 2 C throughout the test. NOTE A suitable range of temperature for most purposes is -40 C to +20 C. 6 Tes
27、t specimens 6.1 Sampling The specimens shall be taken in accordance with EN ISO 15605 and prepared in accordance with EN 1067. 6.2 Dimensions The thickness of the test specimens shall be (0,4 0,1) mm but the other dimensions of the test specimens are not critical provided that the test specimen is r
28、ectangular and fits into the bend test apparatus. The test specimens shall be without visible flaws. 6.3 Preparation of the adhesive film The adhesive film shall be (0,4 0,1) mm thick and prepared by any suitable method. BS EN 12703:2012EN 12703:2012 (E) 6 7 Conditioning 7.1 Preliminary conditioning
29、 Condition the specimens at a temperature of (23 2) C and (50 5) % relative humidity for 24 h in accordance with ISO 554. 7.2 Conditioning Condition the specimens and test apparatus at the temperature at which the test is to be carried out for a minimum period of 4 h. 8 Procedure 8.1 Pass/fail test
30、Open fully the bend test apparatus (5.1) and insert a conditioned specimen under the mandrel so that one end is against the stop. Close the apparatus in not less than 1 s and not more than 2 s thus bending the specimens around the mandrel through 180 (see Figures 1 and 2). Figure 2 Bend test apparat
31、us in use NOTE Care should be taken to not affect the temperature of the specimen with the fingers. Tongs conditioned at the test temperature or cotton gloves should be used. Preferably carry out the test in the chamber (5.2), but in any case ensure that warm air is excluded from the test specimen a
32、nd mandrel while the test is carried out. Carry out a series of five tests using different test specimens conditioning the mandrel before each test for an appropriate time to restore it to the test temperature. BS EN 12703:2012EN 12703:2012 (E) 7 Examine the test specimen for visible signs of crazin
33、g, cracking or fracture. If any specimen shows signs of fracture, crazing or cracking, repeat the test. 8.2 Determination of cold crack temperature Carry out the procedure described in 8.1 over a range of test temperatures at 5 C intervals using a fresh set of five test specimens at each temperature
34、. NOTE It is advisable to carry out exploratory tests to determine the broad range within which the cold crack temperature lies. If any test specimen shows signs of crazing, cracking or fracture, repeat the test. 9 Expression of results 9.1 Pass/fail test Express the result as a failure at the speci
35、fied temperature if two or more of the test specimens show signs of crazing, cracking or fracture (this includes the result of a repeat test if any test specimen in the first set failed). Alternatively, express the result as a pass at the specified temperature. 9.2 Cold crack temperature Express the
36、 cold crack temperature as the highest temperature at which more than one test specimen shows signs of crazing, cracking or fracture. 10 Test report The report shall include, at least, the following: a) a reference to this European Standard, i.e. EN 12703:2012; b) identification of the adhesive, giv
37、ing all information for the sample; c) dimensions of the test specimens; d) details of the conditioning of the test specimen and test climatic conditions; e) the result of the pass/fail test at the specified temperature or the determined cold crack temperature; f) date of test. This page deliberatel
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