1、BRITISH STANDARD BS EN 635-1:1995 Plywood Classification by surface appearance Part 1: General The European Standard EN635-1:1994has the status of a British StandardBSEN 635-1:1995 This British Standard, having been prepared under the directionof the Sector Board forBuilding and Civil Engineering, w
2、as published underthe authority of the Standards Board and comes intoeffect on 15 June 1995 BSI03-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 92/11486DC ISBN 0 580 24504 7 Committees responsible for this British Standard The Unit
3、ed Kingdom participation in the preparation of this European Standard was entrusted to Technical Committee B/541, Wood-based panels, upon which the following bodies were represented: APA/Engineered Wood Association Association of British Plywood and Veneer Manufacturers British Woodworking Federatio
4、n Council of the Forest Industries of British Columbia Department of the Environment (Building Research Establishment) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Association Institution of Structural Engineers Local Authority
5、 Organizations Mineral Bonded Board Products Federation National Federation of Roofing Contractors National House-building Council National Panel Products Association Royal Institute of British Architects Structural Board Association Timber Research and Development Association Timber Trade Federatio
6、n Wood Panel Products Federation Zurich Insurance Company Amendments issued since publication Amd. No. Date CommentsBS EN 635-1:1995 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN635-1 3 List of references Inside back coverBSEN 635-1:
7、1995 ii BSI 03-1999 National foreword This British Standard has been prepared under the direction of the Sector Board for Building and Civil Engineering and is the English language version of EN635-1:1994Plywood Classification by surface appearance Part 1: General, published by the European Committe
8、e for Standardization (CEN). It is one of three Parts dealing with the classification of plywood by surface appearance. The other two are: BS EN635-2, Plywood Classification by surface appearance Part2:Hardwood. BS EN635-3, Plywood Classification by surface appearance Part3:Softwood. BS EN635-1, BS
9、EN635-2 and BS EN635-3together supersede BS6566-6:1985, which will be withdrawn on publication of the other two parts of BS EN635. The method of classification used in BS EN635-2and BS EN635-3is similar to that of BS6566-6:1985. But, although the appearance classes in BS EN635-2and BS EN635-3are ide
10、ntified as E,I,II,III andIV, these classes do not correspond exactly to the appearance classes (grades) E,I,II,III andIV of BS6566-6. The BS EN635standards are thus not technically equivalent to BS6566-6. A British Standard does not purport to include all the necessary provisions of a contract. User
11、s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard BS EN635Plywood Classification by surface appearance EN635-2 Par
12、t 2:1995Hardwood a EN635-3 Part 3:1995Softwood a a In preparation. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had am
13、endments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN635-1 December1994 ICS79.060.10 Descriptors: Wooden boards, plywood, classifications, appearance, defects English version Plywood Classification by surfac
14、e appearance Part1:General Contreplaqu Classification selon laspect des faces Partie1: Gnralits Sperrholz Klassifizierung nach dem Aussehen der Oberflche Teil1: Allgemeines This European Standard was approved by CEN on1994-12-05. CEN members are bound to comply with the CEN/CENELEC Internal Regulati
15、ons 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 such national standards may be obtained on application to the Central Secretariat or to any CEN member. This Europ
16、ean 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 and notified to the Central Secretariat has the same status as the official versions. CEN members are the natio
17、nal standards bodies of Austria, 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 Nor
18、mung Central Secretariat: rue de Stassart36, B-1050Brussels 1994Copyright reserved to CEN members Ref. No. EN635-1:1994EEN635-1:1994 BSI 03-1999 2 Foreword This European Standard was prepared by Working Group2, Plywood, (Secretariat: France) of Technical Committee CEN/TC112, Wood-based panels, (Secr
19、etariat: Germany). This standard is one of a series of standards for the classification of plywood by surface appearance. The other parts of this series are listed in clause2 and Annex A. The text is based on ISO2426, which has been elaborated with European participation. No existing European Standa
20、rd is superseded. 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 June1995, and conflicting national standards shall be withdrawn at the latest by June1995. In accordance with the common CEN/CENEL
21、EC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative
22、 references 3 3 Classification by surface appearance 3 4 Rules for classification 4 Annex A (informative) Bibliography 6EN635-1:1994 BSI 03-1999 3 1 Scope This part of EN635establishes general rules for the classification of plywood by its surface appearance. It does not apply to overlaid plywood. 2
23、 Normative references This European Standard incorporates by dated or undated references, 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 revisi
24、ons of any of these publications 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. EN635-2, Plywood Classification by surface appearance Part 2: Hardwood. EN635-3, Plywood Classifi
25、cation by surface appearance Part 3: Softwood. 3 Classification by surface appearance 3.1 Classes Classification of plywood by surface appearance is made according to the number and the extent of certain natural characteristics of wood and the defects that come from the manufacturing process. Five a
26、ppearance classes are distinguished, identified with the following codes: E,I,II,III,IV. 3.2 Characteristics and defects taken into consideration Determination of the appearance class, based on the appearance of the panel surfaces, shall take into account the categories of characteristics given in3.
27、2.1 and defects given in3.2.2. 3.2.1 Characteristics inherent in wood Category Type 3.2.1.1 Pin knots 3.2.1.2 Sound intergrown knots 3.2.1.3 a) Unsound knots 1) Dog holes 2) Knot holes b) Non-adhering and partially adhering knots c) Holes, except those due to insects, marine borers and parasitic pla
28、nts 3.2.1.4 a) Splits 1) Open 2) Closed b) Checks 3.2.1.5 Abnormalities due to insects, marine borers and parasitic plants 1) Small worm holes 2) Large worm holes 3) Marine borer holes 4) Marks from parasitic plants 3.2.1.6 a) Resin pockets b) Resin streaks c) Inbark 3.2.1.7 Irregularities in the st
29、ructure of the wood a 1) Angle grain 2) Curly grain 3) Interlocked grain 4) Spiral grain 3.2.1.8 Discoloration which is not wood-destroying 1) Blue stain, mould and fungal discoloration 2) Coloured sapstain 3) False heartwood 4) Other discoloration such as chemical stain and colour streaks 3.2.1.9 F
30、ungal decay which is wood-destroying Rot 3.2.1.10 Other characteristics To be considered under the category which they most closely resemble a When irregularities of grain result in roughness, these shall be considered as one category of characteristics.EN635-1:1994 4 BSI 03-1999 3.2.2 Manufacturing
31、 defects 3.3 Classification by appearance of panels The appearance class of plywood is determined by the classes of its surfaces. The class of the plywood first describes the class of the face followed by the class of the back. 4 Rules for classification 4.1 Classification for hardwood and softwood
32、The permissible characteristics and defects for each of these appearance classes of this European Standard are specified in Part2for hardwood and in Part3for softwood. 4.2 Conditions of admissibility for inherent characteristics of wood, and manufacturing defects 4.2.1 General Characteristics and de
33、fects which are limited in number, size, or extent, are either enumerated, or evaluated over the total surface of the panel. This number or extent is expressed per square metre of panel, with the exception of checks, splits and open joints which are related to one metre of panel width. The number an
34、d the extent of characteristics and defects shall be defined as follows and rounded off to the nearest unit. a) For knots and holes: 1) individual diameter; 2) cumulative diameters expressed per square metre of panel surface. NOTEThe diameter of a knot or hole is conventionally defined as the diamet
35、er across the general direction of the grain of the veneer. b) For checks, splits and open joints: 1) individual length; 2) individual width; 3) number per metre of panel width. Category Type 3.2.2.1 Open joints 3.2.2.2 Overlaps 3.2.2.3 Blisters 3.2.2.4 a) Hollows b) Imprints c) Bumps 3.2.2.5 Roughn
36、ess, other than that due to irregularities in the structure of the wood 3.2.2.6 Sanding through 3.2.2.7 Glue penetration 3.2.2.8 Foreign particles Metal, mineral, . 3.2.2.9 Repairs 1) Patches 2) Shims 3) Synthetic fillers 3.2.2.10 Defects at the edges of the panel 1) Sanding defects 2) Sawing defect
37、s 3) Missing wood 3.2.2.11 Other defects To be considered under the category which they most closely resembleEN635-1:1994 BSI 03-1999 5 4.2.2 Joints In appearance classI toIV, the number and the width of veneers which form the outer plies of a panel is not restricted, provided the joints are well ma
38、de. The veneers forming the outer plies of classI shall be well matched for colour and have similar grain. The outer plies shall be laid with the joints approximately parallel to the edges of the panel. In class E, the outer ply using rotary cut veneer may be of one or two veneers provided that the
39、joint is well made, approximately at the centre of the panel, approximately parallel to the edges of the panel and that the veneers are well matched for colour and of similar grain. 4.2.3 Inclusions The inclusion of foreign particles likely to damage the machining equipment is not permitted. 4.2.4 R
40、epairs Patches and shims used for the repairs shall fit and be properly fixed. The matching for colour and grain shall be in accordance with the requirements for the appropriate appearance class. Synthetic filling is permitted subject to the appearance class requirement.EN635-1:1994 6 BSI 03-1999 An
41、nex A (informative) Bibliography EN313-2, Plywood Classification and terminology Part 2: Terminology. ENV635-4, Plywood Classification by surface appearance Part 4: Parameters of ability for finishing, Guideline 1) . 1) At present at the draft stage.BSEN635-1:1995 BSI 03-1999 List of references See
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