1、BS EN 12704:2016Adhesives for paper andboard, packaging anddisposable sanitary products Determination of foamformation for aqueousadhesivesBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12704:2016 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of EN 12704:2016. Itsupersedes BS EN 12704:2012 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can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 publication does not
3、 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 91482 9ICS 83.180Compliance with a British Standard cannot confer immunity fromlegal obligatio
4、ns.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 12704:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12704 August 2016 ICS 83.180 Supersedes EN 12704:2012En
5、glish Version Adhesives for paper and board, packaging and disposable sanitary products - Determination of foam formation for aqueous adhesives Adhsifs pour papier, carton, emballage et produits sanitaires jetables - Dtermination de la formation de mousse des adhsifs aqueux Klebstoffe fr Papier, Ver
6、packung und Hygieneprodukte - Bestimmung der Schaumbildung von wssrigen Klebstoffen This European Standard was approved by CEN on 6 May 2016. 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 nat
7、ional 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 Standard exists in three official versions (English, French, German). A ve
8、rsion 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 national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus,
9、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdo
10、m. 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 means reserved worldwide for CEN national Members. Ref. No. EN 12704:201
11、6 EBS EN 12704:2016EN 12704:2016 (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 Procedure. 6 7 Expression of results 7 8 Test report . 7 Bibliography 8 BS EN 12704:2016EN 12704:2016 (E) 3 Europ
12、ean foreword This document (EN 12704:2016) 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
13、by February 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 right
14、s. This document supersedes EN 12704:2012. 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
15、Yugoslav 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 12704:2016EN 12704:2016 (E) 4 Introduc
16、tion 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 hea
17、lth practices 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 e
18、liminated 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 12704:2016EN 12704:2016 (E) 5 1 Scope This European Standard specifies a test method to dete
19、rmine the foam formation, or air entrainment during rapid stirring of aqueous adhesives with a maximum viscosity of 10 000 MPas at room temperature determined in accordance with EN 12092. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document
20、 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 - Terms and definitions EN 1067, Adhesives - Examination and preparation of sa
21、mples for testing EN ISO 15605, Adhesives - Sampling (ISO 15605) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923 apply. 4 Principle The adhesive is stirred under defined conditions and the foam formation determined from the differences between the
22、 initial and final volumes of the adhesive. 5 Apparatus Specimens shall be conditioned for 24 h at 23 C and 50 % RH. 5.1 Stirrer motor, capable of driving the stirrer at an adjustable rotary speed up to 3 000 min1. 5.2 Stirrer, with dimensions as shown in Figure 1. 5.3 Beaker, 2 l, of transparent ma
23、terial of approximately dimensions, h = 230 mm, d = 105 mm. 5.4 Balance, accuracy 1,0 g. 5.5 Mechanical system, to secure the stirrer and beaker. 5.6 Timer, accuracy 1 s. 5.7 Ruler, accuracy 1 mm. BS EN 12704:2016EN 12704:2016 (E) 6 Dimensions in millimetres Figure 1 Stirrer 6 Procedure 6.1 Take the
24、 sample in accordance with EN ISO 15605 and prepare the sample in accordance with EN 1067. Weigh (400 10) g directly into the clean beaker (5.3). 6.2 Position the stirrer (5.2) in the beaker so that it is approximately 1 mm from the bottom and the shaft of the stirrer is in the centre of the beaker,
25、 (1,00 mm). 6.3 Measure the initial height hi(in millimetres) of the adhesive in the beaker. 6.4 Begin stirring slowly and increase to 2 500 min1over 10 s. 6.5 Start the timer (5.6) and continue stirring for 5 min. 6.6 Stop stirring and immediately measure the final max height hf(in millimetres) of
26、the adhesive in the beaker. 6.7 Measure the height of the adhesive also after 1 min and 5 min. 6.8 Carry on minimum of 3 tests, each test consisting of three measurements of adhesive height after stirring (immediately, 1 min and 5 min), as described in 6.6 and 6.7. NOTE Comparison of the values of a
27、dhesive height taken immediately after stirring, after 1 min and after 5 min are an indication of foam stability. Faster decrease in foam height with time means worse foam stability. BS EN 12704:2016EN 12704:2016 (E) 7 7 Expression of results Calculate the Foam Formation, f, as a percentage, calcula
28、ted from the difference in height of the adhesive before and after stirring, using the following equation: = fii00(%) 1hhfh(1) where hffinal height of adhesive after stirring, in millimetres; hiinitial height of adhesive before stirring, in millimetres; f (%) foam formation (as %). In each test, cal
29、culate the foam formation as the arithmetic mean of the results of the three measurements of adhesive height carried out immediately after stirring, after 1 min and after 5 min. Express final value of Foam Formation obtained in the last three tests. 8 Test report Test report shall include: a) a refe
30、rence to this European Standard; b) identification of the adhesive, giving all information for the sample; c) description of the adhesive (i.e. chemical type, pH, viscosity); d) number of tests carried out; e) foam formation; f) date of test. BS EN 12704:2016EN 12704:2016 (E) 8 Bibliography EN 12092
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