1、BRITISH STANDARD CEN EN*635-L 94 D 3404589 0096822 634 Plywood - Classification by surface appearance Part 1. General The European Standard EN 635-1 : 1994 has the status of a British Standard BS EN 635-1 : 1995 BS EN 6351 : 1995 authority of the Standards Board and comes into effect on 15June1995 0
2、 BSI 1995 Amd. No. Committees responsible for this British Standard Date Iext affected The United Kingdom participation in the preparation of this European Standard was entrusted to Ichnical Committee B/541, Wood-based panels, upon which the following bodies were represented: APAiEngineered Wood Ass
3、ociation Association of British Plywood and Veneer Manufacturers British Woodworking Federation Council of the Forest Industries of British Columbia Department of the Environment (Building Research Establishment) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commissi
4、on Furniture Industry Research Association Institution of Structural Engineers Local Authority Organizations Mineral Bonded Board Products Federation National Federation of Roofing Contractors National House-budding Council National Panel Products Association Royal Institute of British Architects St
5、ructural Board Association Timber Research and Development Association Timber Trade Federation Wood Panel Products Federation Zurich Insurance Company The following BSI references relate to the work on this standard: Committee reference Bi541 Draft for comment 92/11486 DC ISBN O 580 24504 7 CEN EN*b
6、35-L 74 I 3404587 009b24 407 I BS EN 635-1 : 1995 Contents Committees responsible fige Inside front cover National foreword ii Foreword 2 Qxt Of EN 635-1 3 i CEN EN*b35-L 94 a 3404589 009b825 343 BS EN 6351 : 1995 National foreword This British Standard has been prepared under the direction of the S
7、ector Board for Building and Civil Engineering and is the English language version of EN 635-1 : 1994 Plywood - Clmsfkation by suyjizce appearance - Part 1: General, published by the European Committee for Standardization (CEN). It is one of three Parts dealing with the classification of plywood by
8、surface appearance. The other two are: BS EN 635-2 BS EN 635-3 Plywood - Culssa$%mtwn by su?$me appearance - Part 2: Hardwood Plywood - Clusfication by suqme appearance - Part 3: Softwood BS EN 635-1, BS EN 635-2 and BS EN 635-3 together supersede BS 6566 : Part 6 : 1985, which wili be withdrawn on
9、publication of the other two parts of BS EN 635. The method of classification used in BS EN 635-2 and BS EN 635-3 is similar to that of BS 6566 : Part 6 : 1985. But, although the appearance classes in BS EN 635-2 and BS EN 635-3 are identified as E, I, II, III and IV, these classes do not correspond
10、 exactly to the appearance classes (grades) E, I, II, III and IVof BS 6566 : Part 6. The BS EN 635 standards are thus not technically equivalent to BS 6566 : Part 6. Cross-references Publication referred to Corresponding British Standard BS EN 635 Plywood - Classification by suflme amearame Part 2 :
11、 1995 Hardwood1) Part 3 : 1995 Soflwoodl) EN 635-2 EN 635-3 Compliance with a British Standard does not of itself confer immunity from legal obligations. 1 In preparation. ii CEN EN+635-L 94 3404589 O096826 28T = EUROPEAN STANDARD NORMEEUROPENNE EUROPISCHE NORM EN 635-1 December 1994 ICs 79.060.10 D
12、escriptors: wooden boards, plywood, classifications, appearance, defects English version Plywood - Classification by surface appearance - Part 1: General Contreplaqu - Classification selon 1 aspect des faces - Partie 1: Gnralits Sperrholz - Klassifizierung nach dem Aussehen der Oberflche - %il 1: Al
13、lgemeines This European Standard was approved by CEN on 1994-12-05. CEN members are bound to comply with the CENICENELEC 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 bibliographica
14、l references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. “his 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 me
15、mber 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 Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sw
16、eden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to CEN members Ref. No. EN 635-1 : 1994 E Page 2 EN 6351 : 1994 Foreword T
17、his European Standard was prepared by Working Group 2, Plywood, (Secretariat: France) of Echnical Committee CEN/TC 112, Wood-based panels, (Secretariat: 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
18、 listed in clause 2 and annex A. The text is based on IS0 2426, which has been elaborated with European participation. , No existing European Standard is superseded. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
19、 at the latest by June 1995, and conflicting national standards shall be withdrawn at the latest by June 1995. In accordance with the common CENKENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland,
20、Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents page Foreword 2 1 Scope 3 2 Normative references 3 3 Classification by surface appearance 3 4 Rules for classification 4 Annex A (informative) Bibliography 6 CEN EN*635-L 94 E 3404589 O096
21、828 052 3.2.1.2 Sound intergrown knots 3.2.1.3 a) Unsound knots b) Non-adhering and partially adhering knots c) Holes, except those due to insects, marine borers and parasitic plants 3.2.1.4 a) Splits b) Checks Abnormalities due to insects, marine borers and parasitic plants 3.2.1.5 3.2.1.6 a) Resin
22、 pockets b) Resin streaks c) Inbark Irregularities in the structure of the wood1) 3.2.1.7 3.2.1.8 Discoloration which is not wood-destroying 3.2.1.9 3.2. I. 10 Other characteristics )When irregularities of grain result in roughness, these shall be Fungal decay which is wood-destroying 1 Scope This p
23、art of EN 635 establishes general rules for the classification of plywood by its surface appearance. It does not apply to overlaid plywood. I 1) Dog holes 2) Knot holes 1) Open 2) Closed 1) Small worm holes 2) Large worm holes 3) Marine borer holes 4) Marks from parasitic plants 1) Anglegrain 2) Cur
24、ly grain 3) Interlocked grain 4) Spiral grain 1) 2) Coloured sapstain 3) False heartwood 4) Rot RI be considered under the category which they most closely resemble Blue stain, mould and fungal discoloration Other discoloration such as chemical stain and colour streaks considered as one category of
25、characteristics. 2 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 amend
26、ments to or revisions 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. 3.2.1 Characteristics inherent in wood Page 3 EN 6351 : 1994 EN 635-2 Plywood -
27、 Classcation by sqfizce appearance Part 2: Hardwood EN 635-3 Plywood - Clussification by suvfce 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 characteris
28、tics of wood and the defects that come from the manufacturing process. Five appearance 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 pan
29、el surfaces, shall take into account the categories of characteristics given in 3.2.1 and defects given in 3.2.2. Category 1 Type 3.2.1.1 Pin knots CEN EN*b35-L 94 3404589 0076829 T77 3.2.2.9 Repairs 3.2.2.10 Defects at the edges of the panel 3.2.2.11 Other defects Page 4 EN 635-1 : 1994 1) Patches
30、2) shims 3) Synthetic fillers 1) Sanding defects 2) Sawing defects 3) Missing wood “0 be considered under the category which they most closely resemble 3.2.2 Manqfacturing defects category . 1- 3.2.2.1 Open joints I 3.2.2.2 Overlaps 3.2.2.3 Blisters 3.2.2.4 a) Hollows b) Imprints c) Bumps Roughness,
31、 other than that due to irregulanties in the structure of the wood 3.2.2.6 Sanding through 3.2.2.5 3.2.2.7 Glue penetration I 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
32、 the face followed by the class of the back. 4 Rules for classification 4.1 Classification for hardwood and softwood The permissible characteristics and defects for each of these appearance classes of this European Standard are specified in Part 2 for hardwood and in part 3 for softwood. 4.2 Conditi
33、ons of admissibility for inherent characteristics of wood, and manufacturing defects 4.2.1 General Characteristics and defects 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
34、 panel, with the exception of checks, splits and open joints which are related to one metre of panel width. The number and 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 diameter
35、s expressed per square metre of panel surface. N(Y.iE. The diameter of a knot or hole is conventionally defined as the diameter across the general direction of the grain of the veneer. 1) individual length; 2) individual width; 3) number per metre of panel width. b) For checks, splits and open joint
36、s: 4.2.2 Joints In appearance class I to IV, the number and the width of veneers which form the outer plies of a panel is not restricted, provided the joints are well made. The veneers forming the outer plies of class I shall be well matched for colour and have similar grain. The outer plies shall b
37、e 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 joint is well made, approximately at the centre of the panel, approximately parallel to the edges of the panel and that the veneer
38、s are well matched for colour and of similar grain. CEN ENxb35-1 94 3404589 0096830 700 Page 5 EN 6351 : 1994 4.2.3 Inclusions The inclusion of foreign particles iikely to damage the machining equipment is not permitted. 4.2.4 Repairs Patches and shims used for the repairs shali fit and be properly
39、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. Page 6 EN 6351 : 1994 Annex A (informative) Bibliography EN 313-2 Plywood - Chykation and minology r
40、n 2: minology ENV 635-4 Plywood - Ct?uscation by sulrface appearance Frt 4: firamters of abilitg for finishing, Guidelid) 2, At present at the draft stage. - _ CEN EN*b35-1 94 m 3404589 0076832 583 = BS EN 351 : 1995 List of references See national foreword. CEN ENxb35-1 94 m 3404589 009b833 4LT m B
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