1、January 2015 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 83.180!%?DW“2283352www.din.deDDIN EN 16556Determination of the maximum open time for thermoplastic woodadhesives for non-structural applications;English version EN 16556:2014,English translation of DIN EN 16556:2015-01Bestimmung der maximalen offenen Wartezeit bei thermoplastischen Holzklebstoffen
3、frnicht tragende Anwendungen;Englische Fassung EN 16556:2014,Englische bersetzung von DIN EN 16556:2015-01Dtermination du temps ouvert maximal des adhsifs thermoplastiques pour bois pourapplications non structurales;Version anglaise EN 16556:2014,Traduction anglaise de DIN EN 16556:2015-01www.beuth.
4、deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 12 pages 12.14 DIN EN 16556:2015-01 2 A comma is used as the decimal marker. National foreword This document (EN 16556:2014) has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretar
5、iat: AENOR, Spain). The responsible German body involved in its preparation was the DIN-Normenausschuss Holzwirtschaft und Mbel (DIN Standards Committee Timber and Furniture), Working Committee NA 042-04-05 AA Spiegel-ausschuss zu CEN/TC 193/SC 1 Holzklebung. The DIN Standard corresponding to the In
6、ternational Standard referred to in this document is as follows: ISO 6344-2 DIN ISO 6344-2 National Annex NA (informative) Bibliography DIN ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P 12 to P 220 EUROPEAN STANDARD NORME EUROPENNE
7、EUROPISCHE NORM EN 16556 November 2014 ICS 83.180 English Version Determination of the maximum open time for thermoplastic wood adhesives for non-structural applications Dtermination du temps ouvert maximal des adhsifs thermoplastiques pour bois pour applications non structurales Bestimmung der maxi
8、malen offenen Wartezeit bei thermoplastischen Holzklebstoffen fr nicht tragende Anwendungen This European Standard was approved by CEN on 20 September 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
9、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 exists in three official versions (English, French
10、, 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 standards bodies of Austria, Belgium, Bulgaria, C
11、roatia, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey an
12、d United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. N
13、o. EN 16556:2014 E- EN 16556:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Symbols and abbreviations 4 5 Sampling .4 6 Principle 5 7 Apparatus .5 8 Procedure .5 8.1 General 5 8.2 Preparation of test pieces .5 8.3 Number of test pieces .6 8.4 Tens
14、ile shear test.6 9 Expression of results 8 10 Test report 9 Bibliography . 10 DIN EN 16556:2015-01 EN 16556:2014 (E) 3 Foreword This document (EN 16556:2014) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be gi
15、ven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2015 and conflicting national standards shall be withdrawn at the latest by May 2015. Attention is drawn to the possibility that some of the elements of this document may be the
16、subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Safety statement Persons using this document should be familiar with the normal laboratory practice, if applicable. This document cannot address all of the safety problems, if an
17、y, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. Environmental statement It is understood that some of the material permitted in this standard can have negative environmental
18、 impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, it is recommended that the user of the standard take care to carry out an appropriate disposal of the wastes, according to
19、local regulation. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Mace
20、donia, 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. DINEN 16556:2015-01EN 16556:2014 (E) 4 1 Scope This European Standard
21、 defines the test method for the determination of the maximum open time for thermoplastic wood adhesives for non-structural applications by tensile shear strength. It is carried out on standardized test pieces glued with increasing open times. 2 Normative references The following documents, in whole
22、 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 document (including any amendments) applies. EN 923, Adhesives - Terms and definition
23、s EN 1067, Adhesives - Examination and preparation of samples for testing EN ISO 15605, Adhesives - Sampling (ISO 15605) ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification 3 Terms and definitions For the purposes of this doc
24、ument, the terms and definitions given in EN 923 and the following apply. 3.1 maximum open time the longest time within which two wooden adherends, where the adhesive is applied, can remain decoupled ensuring a tensile force value 10 N/mm2and a wood failure 0 % Note 1 to entry: The open time is expr
25、essed in minutes (min). 4 Symbols and abbreviations A bonded test surface, in square millimetres (mm); a thickness of bond-line, in millimetres (mm); angle between growth ring and surfaces to be bonded, in grades ( ); b width of test piece, in millimetres (mm); Fmaxthe applied load at failure, in Ne
26、wton (N); l1length of test piece, in millimetres (mm); l2length of overlap (length of tested surface), in millimetres (mm); s thickness of the panels, in millimetres (mm); shear strength, in Newton (N). 5 Sampling Samples of the adhesive shall be taken according to EN ISO 15605 and prepared for test
27、ing according to EN 1067. DIN EN 16556:2015-01 EN 16556:2014 (E) 5 6 Principle A symmetrical bonded single lap joint between two wooden adherends glued with increasing open times, is strained to rupture by a tensile force parallel to the grain. 7 Apparatus a) Conditioning room capable of ensuring to
28、 the test pieces the temperature at (23 2) C and (50 5) % relative humidity or (20 2) C and (65 5) %. b) Notched trowel suitable to apply on the surface of the boards the required adhesive amount. c) The testing machine shall be a constant-rate-of-traverse machine as described in ISO 5893. The machi
29、ne shall be capable to apply a rate of 50 mm/min. The machine shall apply a force of at least 5 kN 2%. d) The jaws shall grip the test pieces with a wedge action and permit self alignment whilst the test pieces are being pulled. e) Apparatus suitable to obtain individual test pieces from the boards
30、coupled as reported in 8.2, for example a circular saw fitted with blade having a thickness of cut of about 2,5 mm. f) Press suitable to glue two boards (8.1) as indicated in 8.2 with the required pressure. 8 Procedure 8.1 General Cut two panels (see Figure 1) from a thick unsteamed, conditioned, st
31、raight-grained board of beech (Fagus sylvatica L.) with a density of (700 50) kg/m3when the moisture content is (12 1) %. Ensure that the angle between the growth rings and the surface to be bonded is between 30 and 90. Condition the boards for at least 7 days in 7 a) conditions. The adhesive shall
32、be conditioned for at least 24 h. Not more than 24 h before bonding, either lightly plane or lightly sand each surface to be bonded (using an abrasive paper of grain size P100 complying with ISO 6344-2 is recommended). Remove any dust carefully. Do not touch or soil the prepared surfaces. 8.2 Prepar
33、ation of test pieces All the adhesive application procedures shall be carried out in the standard atmosphere (see 7a). Assembly instructions: The adhesive application shall be on one adherend only. The adhesive spread shall be (150 10) g/m2. The distribution of the adhesive shall be uniformly done o
34、ver the whole surface of the board. Immediately after the adhesive application has been completed, the measurement of the open time shall start. The closed assembly time shall be (180 30) s. The pressing pressure shall be (0,8 0,1) N/mm2. DIN EN 16556:2015-01 EN 16556:2014 (E) 6 The pressing time sh
35、all be a minimum of 2 h. Assemble the boards at increasing open times (see note) or according to the manufacturers instructions (range of the maximum open time to be tested and the interval). NOTE e.g. 0-3-6-9-12 min. The glued boards shall be conditioned for 7 days in standard atmosphere (see 7a).
36、Cut five strips of width b = (20 0,2) mm from each bonded assembly along the grain, avoiding areas within 7,5 mm of the outside long edges of the panel as shown in Figure 1. Cut these strips into test pieces of length l1= (150 5) mm as shown in Figure 2. Make flat bottomed cuts of (2,5 0,5) mm wide
37、in the bonded sections across the grain so that an overlap of length l2= (10,0 0,2) mm is defined in the middle section (see Figure 2). The cuts are to separate the wood layers. Take care that the cuts completely cut through the bond line but only penetrate as little as possible into the other part
38、of the joint. For a screening test only (e.g. to determine a rough value of the open time), single lap joint specimens (e.g: see EN 205:2003, Annex A), may be used. 8.3 Number of test pieces Test a sufficient number of test pieces to provide 10 valid results for each of the open times selected. Resu
39、lts from tests in which failure occurred in the wood (100 % of wood failure) at values 10 N/mm2shall be invalid. 8.4 Tensile shear test Test the test pieces shown in Figure 2 in the tensile testing machine (see 7 c). Clamp the ends of the test pieces in the jaws of the tensile testing machine up to
40、a length of 40 mm to 50 mm. Ensure that the force is applied centrally and in the plane of the bond. Load the test piece until rupture. Record the applied maximum force Fmaxin Newton (N). DIN EN 16556:2015-01 EN 16556:2014 (E) 7 Dimensions in mm Key a = (1,0 0,1) mm thickness of bond-line b = (20,0
41、0,2) mm width of test piece l1= (150 5) mm length of test piece s = (5,0 0,1) mm thickness of the panels Figure 1 Example of a bonded panel marked for division into individual test pieces using 2,5 mm saw cuts. DINEN 16556:2015-01EN 16556:2014 (E) 8 Dimensions in mm Key = 30 to 90 (grades) angle bet
42、ween growth ring and surfaces to be bonded b = (20,0 0,2) mm width of test piece (width of tested surface) l1= (150 5) mm total length of test piece l2= (10,0 0,2) mm length of overlap (length of tested surface) s = (5,0 0,1) mm thickness of the panels Figure 2 Lap joint test piece 9 Expression of r
43、esults For each of the test pieces (see Figure 2) the results shall be expressed as follows: The strength in Newton per square millimetre (N/mm2) shall be calculated using formula: max2Flb =(1) where Fmaxis the applied maximum force in Newton (N); l2is the nominal length of the bonded test surface i
44、n millimetres (mm); b is the nominal width of the bonded test surface in millimetres (mm); l2x b= 200 mm2. The adhesive strength for each open time value considered shall be assumed to be the arithmetical mean of the values found on the individual test piece. DINEN 16556:2015-01EN 16556:2014 (E) 9 1
45、0 Test report The test report shall contain the following information: a) a reference to this European Standard; b) the identification elements of the adhesive tested: (e.g. commercial name, etc.); c) the characteristic data relating to the procedure followed to perform the gluing (see 8.2); d) the
46、open time in minutes; e) any deviation from the standard; f) the date of test; g) the reference to the used conditioning atmosphere. DINEN 16556:2015-01EN 16556:2014 (E)10 Bibliography 1 ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220 2 EN 205:2003, Adhesives Wood adhesives for non-structural applications Determination of tensile shear strength of lap joints DINEN 16556:2015-01
