1、DRAFT FOR DEVELOPMENTDD CEN/TS 635-4:2007Plywood Classification by surface appearance Part 4: Parameters of ability for finishing, guidelineICS 79.060.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g
2、40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD CEN/TS 635-4:2007This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007 BSI 2007ISBN 978 0 580 58040 6National forewordThis Draft for Development is the UK implementation
3、of CEN/TS 635-4:2007. It supersedes DD ENV 635-4:1997 which is withdrawn. This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that inform
4、ation and experience of its practical application can be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European standard. A review of this publication will be i
5、nitiated not later than 3 years after its publication by the European organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.According to the replies received by the end o
6、f the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards Hou
7、se, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee B/541, Wood-based panels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the neces
8、sary provisions of a contract. Users are responsible for its correct application.Amendments issued since publicationAmd. No. Date CommentsTECHNICAL SPECIFICATIONSPCIFICATION TECHNIQUETECHNISCHE SPEZIFIKATIONCEN/TS 635-4August 2007ICS 79.060.10 Supersedes ENV 635-4:1996 English VersionPlywood - Class
9、ification by surface appearance - Part 4:Parameters of ability for finishing, guidelineContreplaqu - Classification selon laspect des faces -Partie 4: Paramtres daptitude la finition, guideSperrholz - Klassifizierung nach dem Aussehen derOberflche - Teil 4: Einflussgren auf die Eignung zurOberflchen
10、behandlung, LeitfadenThis Technical Specification (CEN/TS) was approved by CEN on 14 July 2007 for provisional application.The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit theircomments, particularly on the ques
11、tion whether the CEN/TS can be converted into a European Standard.CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS availablepromptly at national level in an appropriate form. It is permissible to keep conflicting national standards
12、 in force (in parallel to the CEN/TS)until the final decision about the possible conversion of the CEN/TS into an EN is reached.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ir
13、eland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 3
14、6 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. CEN/TS 635-4:2007: E2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 General5 4 Terms and definitions .5 5 Selection of plywood.7 CEN/T
15、S 635-4:20073 Foreword This document (CEN/TS 635-4:2007) has been prepared by Technical Committee CEN/TC 112 “Wood-based panels”, the secretariat of which is held by DIN. This document is one of a series for the classification of plywood by surface appearance. The other parts of this series are list
16、ed in Clause 2. This document supersedes ENV 635-4:1996. Compared to ENV 635-4:1996 the following changes have been made: the deliverability has been changed from ENV to CEN/TS. No technical changes have been made. According to the CEN/CENELEC Internal Regulations, the national standards organizatio
17、ns of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Rom
18、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TS 635-4:20074 Introduction Properties specific to plywood can affect the quality of surface finishes and should be taken into account for determining the surface appearance and integrity in both the long and short term
19、 together with the required durability. The information is presented only as a guide for the end user aimed at maximising the lifespan of plywood panels. As this document covers only general situations, the end user is advised to refer to additional documentation for specific products and/or specifi
20、c situations. CEN/TS 635-4:20075 1 Scope This document gives guidance for the end user on the selection of plywood for application of various finishes for use in dry, humid, or exterior end-use conditions. 2 Normative references The following referenced documents are indispensable for the applicatio
21、n of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 314-2, Plywood Bonding quality Part 2: Requirements EN 635-1, Plywood Classification by surface appearance Part 1: Ge
22、neral EN 635-2, Plywood Classification by surface appearance Part 2: Hardwood EN 635-3, Plywood Classification by surface appearance Part 3: Softwood EN 636, Plywood Specifications 3 General The following criteria should be considered in applying a finishing to plywood to achieve a panel of the desi
23、red appearance and durability: the intended end-use and service condition (dry, humid or exterior); the wood species and appearance class(es) of the surface(s); the lay-up of the panel, and the quality of the first inner ply, which could affect the quality of the finish; the type of finishing, e.g.
24、varnish, paint, wood stain, or an overlay. In some situations different criteria can apply. Indications given in Tables 1, 2 and 3 should be considered as minimum requirements. 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 finish chemical f
25、ormulation applied to a surface in one or more coats which turn into a solid film, either by solvent evaporation or chemical reaction NOTE Three groups are generally considered which differ by their formulation and properties. 4.1.1 varnish product which, when applied to a substrate, forms a solid t
26、ransparent film having protective, decorative or other specific technical properties NOTE Its appearance can be glossy, satin or matt. CEN/TS 635-4:20076 4.1.2 paint product which, when applied to a substrate, forms an opaque film having protective, decorative or other specific technical properties
27、NOTE Its appearance can be glossy, satin or matt. 4.1.3 wood-stain liquid product, transparent or semi-transparent for decoration of the wood surface, and optionally for protection against weathering and attack by mould and fungi NOTE In some countries, the term opaque woodstain is also used for a p
28、aint applied at a thickness such that the wood surface structure remains visible. 4.2 finishing process of applying a finish to a substrate 4.3 overlaying process of applying one or several overlay sheets, or one or several films such as: impregnated paper; plastics; resin film; metal; decorative ve
29、neer CEN/TS 635-4:20077 5 Selection of plywood Table 1 Surface finishing Guide to the selection of plywood for use in dry conditions according to EN 636 (EN 636-1) Reference code K L M N O Suitable for all finishes including varnish Suitable for overlaying Suitable for stain or semi transparent fini
30、sh Suitable for paint No special requirement Surface Sanded or textured Sanded or smooth Sanded or textured Sanded or smooth No requirement Minimum appearance class aI III repaired II III IV Maximum thickness of face veneer 3,0 mm 3,0 mm 3,0 mm 3,0 mm No requirement Defects in first inner play No op
31、en defects or overlaps see Clause 3 see Clause 3 see Clause 3 No requirement Bonding class b1 1 1 1 1 aAccording to EN 635-1, EN 635-2 and EN 635-3. bAccording to EN 314-2. CEN/TS 635-4:20078 Table 2 Surface finishing Guide to the selection of plywood for use in humid conditions according to EN 636
32、(EN 636-2) Reference code F G H I J Suitable for all finishes including varnish Suitable for overlaying Suitable for stain or semi transparent finish Suitable for paint No special requirement Surface Sanded or textured Sanded or smooth Sanded or textured Sanded or smooth No requirement Minimum appea
33、rance class aI III repaired II III IV Thickness of face veneer min. 0,4 mm 0,4 mm 0,4 mm 0,4 mm 0,4 mm Thickness of face veneer max. 3,0 mm 3,0 mm 3,0 mm 3,0 mm No requirement Thickness of inner plies max. 5,0 mm 5,0 mm 5,0 mm 5,0 mm 5,0 mm Defects in first inner ply No open defects or overlaps see
34、Clause 3 see Clause 3 see Clause 3 No requirement Bonding class b2 2 2 2 2 aAccording to EN 635-1, EN 635-2 and EN 635-3. bAccording to EN 314-2. CEN/TS 635-4:20079 Table 3 Surface finishing Guide to the selection of plywood for use in exterior conditions according to EN 636 (EN 636-3) Reference cod
35、e A B C D E Suitable for all finishes including varnish Suitable for overlaying Suitable for stain or semi transparent finish Suitable for paint No special requirement Surface Sanded or textured Sanded or smooth Sanded or textured Sanded or smooth No requirement Minimum appearance class aI III repai
36、red II III IV Thickness of face veneer min. 0,6 mm 0,6 mm 0,6 mm 0,6 mm 0,6 mm Thickness of face veneer max. 3,0 mm 3,0 mm 3,0 mm 3,0 mm No requirement Thickness of inner plies max. 5,0 mm 5,0 mm 5,0 mm 5,0 mm 5,0 mm Defects in first inner ply No open defects or overlaps see Clause 3 see Clause 3 se
37、e Clause 3 No requirement Bonding class b3 3 3 3 3 aAccording to EN 635-1, EN 635-2 and EN 635-3. bAccording to EN 314-2. CEN/TS 635-4:2007DD CEN/TS 635-4:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British
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