1、BS EN 12703:2016Adhesives for paper andboard, packaging anddisposable sanitary products Determination of lowtemperature flexibility or coldcrack temperatureBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12703:2016 BRITISH STANDARDNational forewordThis British
2、Standard is the UK implementation of EN 12703:2016. Itsupersedes BS EN 12703:2012 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can beobtained on request to its secretary.This pub
3、lication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 91481 2ICS 83.180Compliance with a British Standard cannot confer immunity fr
4、omlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedBS EN 12703:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12703 August 2016 ICS 83.180 Supersede
5、s EN 12703:2012English 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 - Dtermination de la flexibilit basse temprature ou
6、 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 6 May 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stip
7、ulate 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 Centre or to any CEN member. This European
8、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 as the official versions. CEN members are the
9、 national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
10、, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any
11、 means reserved worldwide for CEN national Members. Ref. No. EN 12703:2016 EBS EN 12703:2016EN 12703:2016 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Principle . 5 5 Apparatus . 5 6 Test specimens . 6 6.1 Sampling . 6 6.2
12、Dimensions 6 6.3 Preparation of the adhesive film . 6 7 Conditioning 6 8 Procedure. 7 8.1 Pass/fail test . 7 8.2 Determination of cold crack temperature . 7 9 Expression of results 8 9.1 Pass/fail test . 8 9.2 Cold crack temperature 8 10 Test report . 8 BS EN 12703:2016EN 12703:2016 (E) 3 European f
13、oreword This document (EN 12703:2016) 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 Fe
14、bruary 2017, and conflicting national standards shall be withdrawn at the latest by February 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. Th
15、is document supersedes EN 12703:2012. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugos
16、lav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12703:2016EN 12703:2016 (E) 4 Introduction
17、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 establish appropriate safety and health p
18、ractices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the material permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be elimin
19、ated from this standard to the extent possible. At the end of the test, the user of the standard should take care to carry out an appropriate disposal of the wastes, according to local regulation. BS EN 12703:2016EN 12703:2016 (E) 5 1 Scope This European Standard specifies a method to determine whet
20、her a film of adhesive of given dimensions will craze, crack or fracture 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 as a quality control test, or to compare the flexibility of adhesive
21、s at low temperatures. 2 Normative references The following 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 docume
22、nt (including any amendments) applies. EN 923, Adhesives - Terms and definitions EN 1067, Adhesives - Examination and preparation of samples for testing EN ISO 15605, Adhesives - Sampling (ISO 15605:2000) 3 Terms and definitions For the purposes of this document, the terms and definitions given in E
23、N 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 successively low
24、er temperatures until a failure occurs. 5 Apparatus Specimens shall be conditioned for 24 h at 23 C and 50 % RH. 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 12703:2016EN 12703:2016 (E) 6 Key
25、1 stop of identical height to mandrel 2 mandrel 3 mandrel 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 mand
26、rel shall be free to rotate on its pin and the apparatus 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
27、 temperature for most purposes is 40 C to + 20 C. 6 Test 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 specimen
28、s are not critical provided that the test specimen is rectangular 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. 7 Conditioning Condition
29、 the specimens and test apparatus at the temperature at which the test is to be carried out for a minimum period of 4 h. BS EN 12703:2016EN 12703:2016 (E) 7 8 Procedure 8.1 Pass/fail test Open fully the bend test apparatus (5.1) and insert a conditioned specimen under the mandrel so that one end is
30、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 apparatus in use Care should be taken not to affect the temperature of the specimen with the fingers. Tongs conditioned
31、 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 and mandrel while the test is carried out. Carry out a series of five tests using different test specimens conditionin
32、g the mandrel before each test for an appropriate time to restore it to the test temperature. Examine the test specimen for visible signs of crazing, cracking or fracture. If any specimen shows signs of fracture, crazing or cracking, repeat the test. 8.2 Determination of cold crack temperature Carry
33、 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. 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 sho
34、ws signs of crazing, cracking or fracture, repeat the test. BS EN 12703:2016EN 12703:2016 (E) 8 9 Expression of results 9.1 Pass/fail test Express the result as a failure at the specified temperature, if two or more of the test specimens show signs of crazing, cracking or fracture (this includes the
35、 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 cold crack temperature as the highest temperature at which more than one test specimen shows signs of crazing, crac
36、king or fracture. 10 Test report The report shall include: a) a reference to this European Standard; b) identification of the adhesive, giving 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
37、 result of the pass/fail test at the specified temperature or the determined cold crack temperature; f) date of test. This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorp
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