1、BRITISH STANDARD BS EN 324-2:1993 Wood-based panels Determination of dimensions of boards Part 2: Determination of squareness and edge straightness The European Standard EN 324-2:1993 has the status of a British StandardBSEN324-2:1993 This British Standard, having been prepared under the directionof
2、 the Technical SectorBoard for Building andCivil Engineering (B/-), waspublished under the authorityof the Standards Boardand comes into effect on 15April1993 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 90/11138 DC ISBN 0
3、580 21039 1 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normali
4、sation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority
5、 of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardi
6、seringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN324-2:1993 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2
7、 Text of EN 324-2 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back coverBSEN324-2:1993 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Technical Sector Board for
8、Building and Civil Engineering and is the English language version of EN 324-2:1993, Wood-based panels Determination of dimensions of boards Part2 Determination of squareness and edge straightness. EN324-2 was produced as a result of international discussion in which the UK took an active part. The
9、principle of this method is technically equivalent to A.2.5 to A.2.8 of BS1142:1989, Specification for fibre building boards, to clauses7.3 and7.4 of BS5669-1:1989, Particleboards Part1 Methods of sampling, conditioning and test; and to clausesA.2.2, A.2.3, A.3, A.4.2, A.4.3, A.5 and A.6 of BS 6566-
10、4:1985, Plywood Part 4 Specification for tolerances on the dimensions of plywood panels, all of which will be withdrawn in due course. 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.
11、Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copy
12、right date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 324-2 February 1993 UDC 674.815:531.74 Descriptors: Wood-based panel, fibreboard, particleboard, plywood, OSB, cement-bon
13、ded particleboard, test method, dimensions of boards, squareness, edge straightness Englishversion Wood-based panels Determination of dimensions of boards Part 2: Determination of squareness and edge straightness Panneaux base de bois Dtermination des dimensions des panneaux Partie2: Dtermination de
14、 lquerrage et de la rectitude des bords Holzwerkstoffe Bestimmung der Plattenmee Teil2: Bestimmung der Rechtwinkligkeit und der Kantengeradheit This European Standard was approved by CEN on 1992-12-15. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the cond
15、itions 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 Central Secretariat or to any CEN member. This European Standard exists in three
16、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Aust
17、ria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: ru
18、e de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 324-2:1993 EEN324-2:1993 BSI 08-1999 2 Foreword This European Standard was prepared by Working Group4 “Common test methods” (Secretariat:United Kingdom) of Technical Committee CEN/TC 112 “Wood-based panels” (Secreta
19、riat:Germany). The text is based on ISO9426-2 which has been elaborated with European participation. This standard is one of a series of standards specifying methods of test for determining dimensions and properties of wood-based panels. No existing European Standard is superseded. This European Sta
20、ndard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August1993, and conflicting national standards shall be withdrawn at the latest by December1994. In accordance with the Common CEN/CENELEC Rules the following countr
21、ies are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3
22、 4 Sampling 3 5 Moisture content at time of measurement 3 6 Conditioning 3 7 Apparatus 3 8 Procedure 3 9 Expression of results 4 10 Test report 4 Annex A (informative) Bibliography 5 Figure 1 Accuracy requirements of mechanicalsquare 3 Figure 2 Use of mechanical square to measureboard squareness 4EN
23、324-2:1993 BSI 08-1999 3 1 Scope This European Standard specifies methods for measuring the squareness and edge straightness of wood-based panels. It applies to whole flat boards. The methods for the determination of thickness, width and length are specified in EN324-1. 2 Normative references This E
24、uropean Standard incorporates by dated or undated reference, provisions 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 publicati
25、ons apply to this European Standard, only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 322, Wood-based panels Determination of moisture content. EN 326-1, Wood-based panels Sampling, cutting and inspection Part
26、 1: Sampling and cutting of test pieces and expression of test results 1) . 3 Principle Squareness and edge straightness of full size boards is determined by measurement of deviation from a mechanical square or straightedge. 4 Sampling Sampling of panels shall be in accordance with EN326-1. 5 Moistu
27、re content at time of measurement Normally boards are measured in the as-received state. If necessary the moisture content of the boards shall be determined in accordance with EN322. 6 Conditioning If required, the boards shall be conditioned to constant mass in an atmosphere with a relative humidit
28、y of (65 5)% and a temperature of(20 2) C. Constant mass is considered to be reached when the results of two successive weighing operations, carried out at an interval of24h, do not differ by more than0,1% of the mass of the board. 7 Apparatus 7.1 Measuring instrument for length and width measuremen
29、t Steel measuring tape, accurate to1mm. 7.2 Mechanical square A mechanical square, having two arms of1000mm1mm for measuring the deviation of the angles of adjacent sides of a board from a right angle. It shall be accurate to0,2mm in1 000mm (seeFigure 1). 7.3 Straightedge A straightedge, of length a
30、t least equal to the length of the board, or wire of constant cross section and flexible enough to be stretched to assure linearity. 7.4 Steel rule, wedge or caliper for deviation measurements A steel rule, wedge or caliper, graduated to at least0,5mm. 8 Procedure 8.1 Determination of squareness of
31、boards 8.1.1 Place one side of the square against one side of the board the squareness of which is to be measured (seeFigure 2). 1) At present at the draft stage. Figure 1 Accuracy requirements of mechanical squareEN324-2:1993 4 BSI 08-1999 8.1.2 At a distance of 1 000mm1mm from the corner of the bo
32、ard, measure the distance 1between the board edge and the side of the other arm of the square by means of one of the measuring devices specified in7.4 (seeFigure 2). 8.1.3 Follow the same procedure for each of the other corners. 8.2 Determination of edge straightness of boards 8.2.1 Place the straig
33、htedge against a board edge, or locate the wire at the corners of the board and stretch it. 8.2.2 Measure the largest deviation between the straightedge (or wire) and the edge of the board using one of the measuring devices specified in7.4 and read the result to the nearest0,5mm. 8.2.3 Follow the sa
34、me procedure for each of the other edges. 9 Expression of results 9.1 Squareness of boards The result is the largest measured value of the deviation of the side of the square and the board edge. It is expressed in mm over1m board edge-length (mm/m) to the nearest0,5mm/m. 9.2 Straightness of board ed
35、ges The result, expressed separately for width and length, in mm/m, is the larger value of the measured deviations divided by the length of the appropriate edge. 10 Test report As described in EN326-1. Figure 2 Use of mechanical square to measure board squarenessEN324-2:1993 BSI 08-1999 5 Annex A (i
36、nformative) Bibliography EN 309, Particleboards Definition and classification. EN 313-1, Plywood Classification and terminology Part 1: Classification. EN 316, Fibreboards Definition, classification and symbols. EN 324-1, Wood-based panels Determination of dimensions of dimensions of boards Part1:De
37、termination of thickness, width and length. EN 633, Cement-bonded particleboards Definition and classification 2) . ISO 9426-2, Wood-based panels Determination of dimensions of boards Determination of squareness and edge straightness 3) . 2) At present at the draft stage. 3) At present at the stage
38、of a draft proposal.6 blankBSEN324-2:1993 BSI 08-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Technical Sector Board for Building and Civil Engineering (B/-) to Technical Committee B/541
39、, upon which the following bodies were represented: American Plywood Association Association of British Plywood and Veneer Manufacturers British Woodworking Federation Chartered Institute of Building Coordinator for Timber and Timber Products Council of the Forest Industries of British Columbia Depa
40、rtment of the Environment (Construction Directorate) Fibre Building Board Organisation (FIDOR) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Association Institution of Structural Engineers National Federation of Roofing Contract
41、ors National Housebuilding Council National Panel Products Association Royal Institute of British Architects Timber Research and Development Association Timber Trade Federation United Kingdom and Ireland Particleboard Association Coopted member National annex NB (informative) Cross-reference Publica
42、tion referred to Corresponding British Standard EN 322 BS EN 322:1993 Wood based panels Method for the determination of moisture contentBS EN 324-2:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStand
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