1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1720:1999 The Europ
2、ean Standard EN 1720:1998 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 dispersabilityBS EN 1720:1999 This British Standard, having been
3、 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 February 1999 BSI 02-1999 ISBN 0 580 30824 3 Amendments issued since publication Amd. No. Date Text affected National foreword T
4、his British Standard is the English language version of EN 1720:1999. 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 responsible European committee any enquiries on
5、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 secretary. Cross-references The British Stan
6、dards 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 Standards Electronic Catalogue. A British Standa
7、rd 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 This document comprises a front cover, a
8、n inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in
9、 any form and by any means reserved worldwide for CEN national Members Ref. No. EN 1720:1998 E EUROPEAN STANDARD EN 1720 NORME EUROPE ENNE EUROPA ISCHE NORM September 1998 ICS 83.180 Descriptors: adhesive, tests, determination, dispersion, procedure English version Adhesives for paper and board, pac
10、kaging and disposable sanitary products Determination of dispersability Adhe sifs pour papier et carton, emballages et produits sanitaires consommables De termination de laptitude a la dispersion Klebstoffe fu r Papier, Verpackung und Hygieneprodukte Bestimmung der Dispergierbarkeit This European St
11、andard was approved by CEN on 4 September 1998. 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 national standard without any alteration. Up-to-date lists and bibliographical references concern
12、ing such national standards may be obtained on application to the Central Secretariat 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 la
13、nguage and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden
14、, Switzerland and United Kingdom.Page 2 EN 1720:1998 BSI 02-1999 Foreword This European Standard 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 o
15、f an identical text or by endorsement, at the latest by March 1999, and conflicting national standards shall be withdrawn at the latest by March 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
16、an Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Principle 3 5 S
17、afety 3 6 Apparatus 3 7 Method 3 8 Expression of results 4 9 Test report 4Page 3 EN 1720:1998 BSI 02-1999 1 Scope This European Standard specifies a method for determining the dispersability of dry adhesive in a dispersing medium. The test can be applied to all types of adhesives covered by this ser
18、ies of standards and includes soluble, dispersion and hot melt systems. The test is intended primarily as a comparative test for investigating the dispersability performance of different adhesives and should not be used to provide accurate data regarding the water resistance of the adhesives in thei
19、r finished bonded state. Test conditions have been left open so that they can be adapted to suit the end use of the adhesive and the possible subsequent recyclability of the substrate/adhesive combination. 2 Normative references This European Standard incorporates, by dated or undated reference, pro
20、visions from other publications. These normative references are cited at the appropriate places in the text and the publications 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
21、 by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 827, Adhesives Determination of conventional solids content and constant mass solids content. EN 923, Adhesives Terms and definitions. EN 1066, Adhesives Sampling. EN 1067, Adhesives Exami
22、nation and preparation of samples for testing. 3 Definition For the purposes of this standard, the definitions in accordance with EN 923 and the following definition apply. 3.1 dispersability the ability of an adhesive film to be broken up into small particles or dissolved when agitated in a liquid
23、4 Principle Dry adhesive is stirred in a dispersing medium (for example water) under defined conditions and the percentages of the dispersed and undispersed adhesive are calculated. 5 Safety Persons using this standard shall be familiar with normal laboratory practice. This standard does not purport
24、 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 and national regulatory conditions. 6 Apparatus 6.1 Magnetic stirrer, with hot plate. 6.2 Suitable container,
25、 for example, 1,5 l beaker. 6.3 Balance, to an accuracy of 0,01 g. 6.4 Release film, for example, untreated polyethylene or silicone release paper. 6.5 Suitable filter NOTE For solubilized systems such as starches, dextrines and polyvinyl alcohols, a filter paper can be suitable. However, for filled
26、 and dispersion systems a fine mesh (for example, 100mm) is recommended. 6.6 Laboratory oven, capable of maintaining a selected temperature to an accuracy of 28C. 7 Method Take a sample of the product to be tested in accordance with EN 1066. Examine and prepare this sample for testing in accordance
27、with EN 1067. Prepare films of adhesive by coating onto the release film so that the final film has a dry coating weight of (500 50) g/m 2 . At least three films shall be prepared. Dry the films at room temperature between 188C and 288C for 24 h. Where water retention of the film is high, further dr
28、ying at 608C approximately to constant weight in a laboratory oven can be required. Remove the adhesive film from the release film, then crumble or cut it. If cut, the size of the pieces shall be 100 mm 2 . Weigh approximately 5 g of the crumbled adhesive (w 1 ) into 1 l of the dispersing medium in
29、the container and stir continuously at the preselected dispersing temperature for 1,5 h with magnetic stirrer. After 1,5 h, immediately pass the liquid through a filter of known weight (w 2 ) and dry the filter together with the retained material at 608C to constant weight (w 3 ) in laboratory oven
30、in accordance with EN 827.Page 4 EN 1720:1998 BSI 02-1999 8 Expression of results Express the results as follows: a) Percentage of dispersed material = 3 100 w 1 2 (w 3 2 w 2 ) w 1 b) Percentage of undispersed material = 3 100 w 3 2 w 2 w 1 9 Test report The following information shall be included i
31、n the test report: a) a reference to this European Standard; b) manufacturers name, grade and batch number or other means of uniquely identifying the adhesive samples; c) drying temperature of adhesive film; d) description of the dispersing medium (that is, chemical type, pH, concentration); e) temp
32、erature of dispersion test; f) type of filter; g) number of tests carried out; h) date of test; i) any other factors which affect the results.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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