1、BRITISH STANDARD BS EN 1896:2001 Adhesives for paper and board, packaging and disposable sanitary products Determination of tensile strength and elongation The European Standard EN 1896:2001 has the status of a British Standard ICS 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPY
2、RIGHT LAWBS EN 1896:2001 This British Standard, having been 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 March 2001 BSI 03-2001 ISBN 0 580 37261 8 National foreword This Brit
3、ish Standard is the official English language version of EN 1896:2001. The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. C
4、ross-references The British Standards 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 Electr
5、onic Catalogue. A British Standard 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. aid enquirers to understa
6、nd the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover,
7、an inside front cover, the EN title page, pages 2 to 7, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1896 January 2001 IC
8、S 83.180 English version Adhesives for paper and board, packaging and disposable sanitary products Determination of tensile strength and elongation Adhsifs pour papier et carton, emballage et produits sanitaires jetables Dtermination de la rsistance la traction et de lallongement Klebstoffe fr Papie
9、r, Verpackung und Hygieneprodukte Bestimmung der Zugfestigkeit und der Dehnung This European Standard was approved by CEN on 6 January 2001. 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 nati
10、onal standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any
11、other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,
12、Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CEN All rights o
13、f exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1896:2001 EPage 2 EN 1896:2001 BSI 03-2001 Contents Page Foreword. 3 1 Scope . 4 2 Normative references. 4 3 Terms and definitions 4 4 Safety . 4 5 Apparatus 4 6 Test specimens. 5 7 Test method 6 8 E
14、xpression of results . 7 9 Test report. 7Page 3 EN 1896:2001 BSI 03-2001 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 publi
15、cation of an identical text or by endorsement, at the latest by July 2001, and conflicting national standards shall be withdrawn at the latest by July 2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this
16、European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Page 4 EN 1896:2001 BSI 03-2001 1 Scope This European Standard specifies a method of t
17、est for the determination of tensile strength and elongation of dry films of hot melt or dispersion adhesives when these are stretched to breakage at a constant pulling speed. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications
18、. 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 by amendment or revision. For
19、undated references the latest edition of the publication referred to applies (including amendments). EN 923, Adhesives Terms and definitions. EN 1066, Adhesives Sampling. EN 1067, Adhesives Examination and preparation of samples for testing. ISO 554, Standard atmospheres for conditioning and/or test
20、ing Specifications. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 923 and the following definitions apply. 3.1 film tensile strength maximum force measured during the extension of test specimen, divided by the initial cross-section area of
21、the test specimen. Tensile strength is dependent of pulling speed 3.2 film elongation at break increase in length, measured at the moment of break, reported to the initial length expressed in percent 4 Safety Persons using this standard shall be familiar with normal laboratory practice. This standar
22、d does not purport 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. 5 Apparatus 5.1 Thickness gauge, able to measure 0,01 m
23、m without deforming the film. 5.2 Tensile testing machine, capable of supplying a tensile force with a constant rate of grip separation. The machine shall be equipped with a force-measuring system complete with an indicator and/or a recorder. The indicated force shall not differ from the true applie
24、d force by more than 2 %. The response time of the machine shall be short enough not to affect the accuracy with which the force applied at the time of rupture can be measured. The force of rupture of the specimen shall lie in the range between 20 % and 80 % of the full-scale reading.Page 5 EN 1896:
25、2001 BSI 03-2001 6 Test specimens 6.1 Sampling Take a sample of the adhesive to be tested in accordance with EN 1066. Examine and prepare it for testing in accordance with EN 1067. 6.2 Preparation of the adhesive film The initial length (l o ) shall be marked taking care of not damaging the film. Be
26、fore testing, the thickness of the test specimen shall be measured at, at least, three points between the marks (l o ), the mean value (t o ) being used as a basis for calculating the cross-sectional area. Variations in the thickness of each individual specimen shall not exceed 4 % of the thickness
27、mean. The width of the test specimen can be assumed to be the same as the cutting width of the die. 6.2.1 Hot melt adhesives The adhesive film shall be (3,00 1,00) mm thick and can be prepared by any suitable method, for instance putting the adhesives between the hot plates of a press using a metall
28、ic spacer to keep the plates separated. 6.2.2 Water based adhesives A single draw down of adhesive is allowed to dry until it reaches equilibrium with a standard atmosphere 23/50 according to ISO 554 to obtain a film (0,35 0,05) mm thick. This equilibrium is considered to be attained when the result
29、s of two consecutive weighings of at least 1 h apart do not differ by more than 0,25 % of the total mass of the test specimen. 6.3 Preparation of test specimens Test specimens shall preferably be cut with a die out of an adhesive film and have a shape as shown in Figure 1 and dimensions as indicated
30、 in Table 1. Other shapes and dimensions can be used if specified and agreed upon. Table 1 Dimensions are in millimetres Type l 0 l l 1 h h 0 R R 1 1 20 1 115 2 33 2 25 1 6 4 14 1 25 2 2 10 1 50 1 17 1 8,5 1 4 1 7,5 3 10 5Page 6 EN 1896:2001 BSI 03-2001 Key l Overall length l 1 Length of narrow para
31、llel-sided portion l 0 Initial marked length h 0 Initial width of test specimens h Width at ends R Small radius R 1 Large radius The initial thickness of the test specimen is t 0 . Figure 1 Test specimens shape 7 Test method 7.1 Tensile test procedure The test shall be carried out in standard atmosp
32、here 23/50 according to ISO 554. Insert the test specimen in the jaws of the tensile testing machine (5.2), with the longitudinal axis in line with the direction in which the force is applied. The test specimen shall not be gripped in parts, which are less than “h” wide. Try to avoid the creation of
33、 stress in the samples when clamping it. When negative stress occurs, do not reset the scale. If positive stress occurs, re-clamp. The rate of separation of the jaws shall be 300 mm/min. Other rates between 10 mm/min and 1 000 mm/min can be agreed upon and have to be recorded in the test report. Det
34、ermine the force applied and the elongation of the test specimen until it breaks, preferably by plotting the force/elongation curve.Page 7 EN 1896:2001 BSI 03-2001 Ensure that the force recorded lies in the range between 20 % and 80 % of the full scale. Test specimens where the break occurs outside
35、the marked length l 0shall not be evaluated. Test at least five test specimens, calculate the mean and take this as the result. 8 Expression of results 8.1 Tensile strength Calculate the tensile strength using the following equation: 0 0t h F where: is the tensile strength, in Newtons per square mil
36、limetre F is the maximum force recorded, in Newtons t 0 is the initial thickness of test specimens, in millimetres h 0 is the initial width of test specimen, in millimetres 8.2 Elongation at break Calculate the elongation at break using the following equation: 100 - 0 B 0 l l l where: B is the elong
37、ation at break, as percentage l B is the marked length at break, in millimetres l 0 is the initial marked length, in millimetres 9 Test report The test report shall include the following: a) a reference to this European Standard; b) a complete identification of the product tested; c) the preparation
38、 of the test specimens; d) test atmosphere; e) type and thickness of test specimens; f) separation speed; g) all the individual measured results and the mean of all of them.BS EN 1896:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body
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