1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12704:2012Adhesives for paper and board, packaging and disposable sanitary products Determination of foam formation for aqueous adhesivesBS EN 12704:2012 BRITISH STANDARDNa
2、tional forewordThis British Standard is the UK implementation of EN 12704:2012.It supersedes BS EN 12704:2000 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained on req
3、uest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 75587 3 ICS 83.180 Compliance with a British
4、 Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 12704:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NO
5、RM EN 12704 March 2012 ICS 83.180 Supersedes EN 12704:1999English 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 form
6、ation de mousse des adhsifs aqueux Klebstoffe fr Papier, Verpackung und Hygieneprodukte - Bestimmung der Schaumbildung von wssrigen KlebstoffenThis European Standard was approved by CEN on 5 February 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
7、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 Standard e
8、xists 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 national
9、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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
10、 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 reserved worldwide for CEN national Members. Ref. No.
11、 EN 12704:2012: EBS EN 12704:2012EN 12704:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Apparatus .46 Procedure .57 Expression of results 68 Test report 6BS EN 12704:2012EN 12704:2012 (E) 3 Foreword This document (EN 12704:2012) has been
12、 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 conflicting national standar
13、ds 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 document supersedes EN 127
14、04:1999. 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 establish appropriate safety and
15、 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 alternatives for these materials, t
16、hey 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 Regulations, the national standa
17、rds 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, Malta, Netherlands, Norway, Po
18、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12704:2012EN 12704:2012 (E) 4 1 Scope This European Standard specifies a test method to determine the foam formation, or air entrainment during rapid stirring of aqueous adhesives with a max
19、imum viscosity of 10 000 MPa s 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 and are indispensable for its application. For dated references, only the edition cited applies.
20、 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 samples for testing EN 12092, Adhesives Determination of viscosity EN ISO 15605, Adhesives Sampling (IS
21、O 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 given in EN 923 apply. 4 Principle The adhesive is stirred under defined conditions and the foam formation determined from the di
22、fferences between the initial and final volumes of the adhesive. 5 Apparatus 5.1 Stirrer motor, capable of driving the stirrer at an adjustable rotary speed up to 3 000 min-1. 5.2 Stirrer, with dimensions as shown in Figure 1. 5.3 Beaker, 2 l, of transparent material of approximately dimensions, h =
23、 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 12704:2012EN 12704:2012 (E) 5 Dimensions in millimetres Figure 1 Stirrer 6 Procedure 6.1 Take the sample in accordance with EN ISO 15605
24、 and prepare the sample in accordance with EN 1067. Weigh (400 10) g directly into the clean beaker (5.3). 6.2 Condition the sample at temperature of (23 2) C and (50 5) % relative humidity in accordance with ISO 554. 6.3 Position the stirrer (5.2) in the beaker so that it is approximately 1 mm from
25、 the bottom and the shaft of the stirrer is in the centre of the beaker, ( 1,00 mm). 6.4 Measure the initial height hi(in millimetres) of the adhesive in the beaker. 6.5 Begin stirring slowly and increase to 2 500 min-1over 10 s. 6.6 Start the timer (5.6) and continue stirring for 5 min. 6.7 Stop st
26、irring and immediately measure the final max height hf(in millimetres) of the adhesive in the beaker. 6.8 Measure the height of the adhesive also after 1 min and 5 min. 6.9 Carry out a minimum of 3 tests, each test consisting of three measurements of adhesive height after stirring (immediately, 1 mi
27、n and 5 min), as described in 6.7 and 6.8. NOTE Comparison of the values of adhesive height taken immediately after stirring, after 1 min after 5 min are an indication of foam stability. Faster decrease in foam height with time means worse foam stability. BS EN 12704:2012EN 12704:2012 (E) 6 7 Expres
28、sion of results Calculate the Foam Formation, f, as a percentage, calculated from the difference in height of the adhesive before and after stirring, using the following formula (1): 100x(%)iifhhhf= (1) where hfis the final height of adhesive after stirring, in millimetres; hiis the initial height o
29、f adhesive before stirring, in millimetres; f (%) is the foam formation, as %. In each test, calculate 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 the final value of
30、 Foam Formation obtained in the last three tests. 8 Test report Test report shall include, at least, the following: a) a reference to this European Standard, i.e. EN 12704:2012; b) identification of the adhesive, giving all information for the sample; c) description of the adhesive (i.e. chemical ty
31、pe, pH, viscosity); d) number of tests carried out; e) foam formation; f) date of test. This page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services. It presents the UK view on sta
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