1、BRITISH STANDARD Wood-based panels Surface soundness Test method The European Standard EN 3 11:2002 has the status of a British Standard ICs 79.060.20 BS EN 3 1 1 :2002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW $ present to the responsible internatio
2、nal/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. - A list of organizations represented on this committee can be obtained on request to its se
3、cretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search”faci1ity ofthe BSI Electronic Catal
4、ogue or ofBritish Stan dards Online. This publication does not purport to include all the necessary provisions of a contract. Users of this publication are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary
5、of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 27 May 2002 ISBN O 580 39783 I EUROPEAN STANDARD NORME E
6、UROPENNE EUROPISCHE NORM EN 311 May 2002 ICs 79.060.20 Supersedes EN 31 1 :I 992 English version Wood-based panels - Surface soundness - Test method Panneaux base de bois - Arrachement de la surface - Mthode dessai Holzwerkstoffe - Abhebefestigkeit der Oberflche - Prfverfahren This European Standard
7、 was approved by CEN on 24 February 2002. CEN members are bound to comply with the CENKENELEC 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 concerning suc
8、h 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 other language made by translation under the responsibility of a CEN member into its own language an
9、d 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, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Sw
10、itzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Re
11、f. No. EN 311:2002 E EN 311:2002 (E) Contents page Foreword 3 1 2 3 4 5 6 6.1 6.2 6.2.1 6.2.2 6.3 7 7.1 7.2 8 9 Scope 4 Normative references 4 Terms and definitions 4 Principle 4 Apparat us . 4 Test pieces 5 Sampling and cutting 5 Preparing the groove in the test piece 5 Unfaced panels . 5 Overlaid
12、panels 5 Procedure . 5 Bonding the steel pad to the surface . 5 Determination of force at fracture 6 Expression of results 6 Test report 6 Conditioning . 5 2 EN 31 1 :2002 (E) Foreword This document EN 31 1 :2002 has been prepared by Technical Committee CEN/TC 112 “Wood-based panels“, the secretaria
13、t of which is held by DIN. 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 November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002. This document supers
14、edes EN 31 1 :I 992. Compared to the version EN 31 1 :I992 the following modifications have been made: a) dry process fibreboards, and cement bonded particleboards. The scope has been extended. The standard is now also applicable to overlaid wood-based panels, to wet and b) The number of test pieces
15、 has been changed from 10 to 8. c) The test procedure for boards thinner than 15 mm has been modified. According to the CENKENELEC Internal Regulations, the national standards organizations of the following coun- tries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
16、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Swe- den, Switzerland and the United Kingdom. 3 EN 311:2002 (E) 1 Scope This European Standard specifies a method of assessing the surface soundness of overlaid wood-based pan
17、els and unfaced particleboards, wet and dry process fibreboards and cement bonded particleboards. NOTE The grid patterned face of wet processed hardboards cannot be tested according to this European Standard. 2 Normative references This European Standard incorporates by dated or undated reference, p
18、rovisions 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
19、 it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 326-1, Wood-based panels - Sampling, cutting and inspection - Part I: Sampling and cutting of test pieces and expression of test results. 3 Terms and definitions
20、For the purposes of this European Standard, the following terms and definitions apply. 3.1 surfacesoundness strength or quality of bonding between the particles or fibres at the surface of a board and the layer below (unfaced panels) or between the coating material and the underlying board (overlaid
21、 panels) 3.2 overlaid panel panel surfaced with one or more overlay sheets or films, for example impregnated paper, plastics, resin film, metal, decorative veneer 4 Principle Measurement of the tensile load required to pull off a defined surface area of overlaid or unfaced panel. 5 Apparatus 5.1 Dev
22、ices to produce a groove as illustrated in Figure 1 within the tolerance specified in 6.2. 5.2 bending during the test. A typical example is shown in Figure 2. Steel mushroom-shaped pad with a diameter of 35,6*0,1 mm and of a sufficient thickness to prevent 5.3 ample of the frame is shown in Figure
23、3. Centring frame with sufficient stiffness, shaped to fit the mushroom-shaped pad shown in Figure 2. An ex- 5.4 an adjustable loading rate. Tensile testing machine with a sufficient loading capacity, having an accuracy of 1 % of the applied load, and 5.5 Steel gimbal as illustrated in Figure 4. 4 E
24、N 31 1 :2002 (E) 6 Test pieces 6.1 Sampling and cutting Carry out the sampling and cutting in accordance with EN 326-1. 8 test pieces, each 50 mm x 50 mm, shall be taken from each board to be tested. 6.2 Preparing the groove in the test piece 6.2.1 Unfaced panels A circular groove shall be cut into
25、the surface of the test pieces (see Figure 1) by means of a milling tool (5.1). On half of the test pieces this groove shall be on one surface of the board and on the other half it shall be on the other surface. The groove shall have an inside diameter of 357 I0,2 mm (enclosing an area of 1 O00 mm)
26、and a depth of (0,3 I0,l) mm. 6.2.2 Overlaid panels A circular groove shall be cut through the coating material so that it just breaks through into the underlying board. The groove shall not penetrate more than 0,3 mm into the board. The groove shall have an inside diameter of 357 I0,2 mm. If the pa
27、nel has the same type of coating on both sides then on half of the test pieces the groove shall be on one surface of the board and on the other half it shall be on the other surface. If the panel has different types of coating on its two surfaces then 8 test pieces for each surface shall be used. 6.
28、3 Conditioning All test pieces shall be conditioned to constant mass in an atmosphere with a percentage relative humidity of (65 15) % and a temperature of (20 12) OC prior to the bonding of the steel mushroom-shaped pad (5.2) to the surface. Constant mass is considered to be reached when the result
29、s of two successive weighing operations, car- ried out at an interval of 24 h, do not differ by more than 0,l % of the mass of the test piece. 7 Procedure 7.1 Bonding the steel pad to the surface NOTE 1 The type of adhesive used, the quantity used, and the manner of application can all affect the me
30、asured strengths. In general use a hot-melt adhesive with a melting point under 150 OC, spread evenly across the face of the heated steel pad. The centring frame is used to position the pad exactly on the test piece. Whilst in the centring frame the hot pad shall be pressed onto the surface of the p
31、iece and held with a light pressure of 0,l N/mm to 0,2 N/mm until the adhesive has cooled and hardened. If there is a weakening effect to the surface soundness from the heating procedure with hot melts (e.g. in the case of dry process fibreboards (MDF) or some kinds of overlaid boards) a cold settin
32、g epoxy adhesive shall be used instead of the hot melt. If the boards to be tested are thinner than 15 mm the test pieces shall be strengthened by bonding a 50 mm x 50 mm steel plate of at least 10 mm thickness to their underside. NOTE 2 can be necessary to prepare the surface by sanding or solvent
33、cleaning. When testing overlaid boards, in order to obtain an efficient bond between the steel pad and the surfacing material it 5 EN 311:2002 (E) 7.2 Determination of force at fracture After the adhesive has cooled and hardened, the test piece shall be placed in the gimbal (5.5). A force shall be a
34、pplied at a constant speed so that failure occurs in (60 130) s. Record the force at failure. For surfaced boards additionally record the failure mode: - within coating; - within glueline; - - within underlying board. If mixed, the percentage of the different fracture mode shall be recorded. between
35、 surface material and underlying board; The results from test pieces that fail within the glueline of the pad shall be rejected, unless the specification value is lower than the test results. 8 Expression of results The surface soundness SS for each test piece in Newtons per square millimetre shall
36、be calculated from the equa- tion SS = FIA where F A is the maximum force in Newtons; is the surface area given in 6.2 (1 O00 mm). Express the result to the nearest 0,Ol Nlmm. 9 Testreport As described in EN 326-1 The results of each surface shall be calculated and reported separately, the set with
37、lower mean giving the value of the board unless its surfaces are clearly marked. In case of overlaid panels report also the failure mode and if relevant the percentage of the different fracture modes. 6 Dimensions in millimetres 35,7.0,2 t- i 50 Figure 1 - Test piece - showing circular groove EN 31
38、1 :2002 (E) Dimensions in millimetres M I 35,6+0,1 N t Figure 2 - Example of a steel mushroom-shaped pad 7 EN 311:2002 (E) Dimensions in millimetres +0,1 “i I r - - -. - -1- - - 1 I I I 50,210,l . O Ln 1 Figure 3 - Example of centring frame Dimensions in millimetres I I 14210.5 I I I II II II i 55 2
39、,Smin. it- I Figure 4 - Gimbal-mounted tensile testing device 8 BS EN 311:2002 B SI 389 Chiswick High Road London w4 4AL BSI -British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the inte
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