BS EN 635-5-1999 Plywood - Classification by surface appearance - Methods for measuring and expressing characteristics and defects《胶合板 按表观分类 评估和表达特征和缺陷的方法》.pdf

《BS EN 635-5-1999 Plywood - Classification by surface appearance - Methods for measuring and expressing characteristics and defects《胶合板 按表观分类 评估和表达特征和缺陷的方法》.pdf》由会员分享，可在线阅读，更多相关《BS EN 635-5-1999 Plywood - Classification by surface appearance - Methods for measuring and expressing characteristics and defects《胶合板 按表观分类 评估和表达特征和缺陷的方法》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 635-5:1999 The Euro

2、pean Standard EN 635-5:1999 has the status of a British Standard ICS 79.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plywood Classification by surface appearance Part 5: Methods for measuring and expressing characteristics and defectsThis British Standard, having bee

3、n prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 August 1999 BSI 08-1999 ISBN 0 580 32361 7 BS EN 635-5:1999 Amendments issued since publication Amd. No. Date Comments N

4、ational foreword This British Standard is the English language version of EN 635-5:1999. The UK participation in its preparation was entrusted to Technical Committee B/541, Wood-based panels, which has the responsibility to: aid enquirers to understand the text; present to the responsible European c

5、ommittee 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 secretary. Cross-r

6、eferences The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic C

7、atalogue. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document

8、comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed throughout this document indicates when the document was last issued.CEN European Committee for Standardization Comite Europe en de Normalisation

9、 Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 635-5:1999 E EUROPEAN STANDARD EN 635-5 NORME EUROPE ENNE EUROPA ISCHE NORM March 199

10、9 ICS 79.060.10 English version Plywood Classification by surface appearance Part 5: Methods for measuring and expressing characteristics and defects Contreplaque Classification selon laspect des faces Partie 5: Me thodes de mesure et dexpression des caracte ristiques et des de fauts Sperrholz Klass

11、ifizierung nach dem Aussehen der Oberfla che Teil 5: Meverfahren und Angabe der Merkmale und Fehler This European Standard was approved by CEN on 3 March 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard t

12、he 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 official versions (English, French, Germa

13、n). 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 Austria, Belgium, Czech Republic, Denmark, Fin

14、land, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 635-5:1999 BSI 08-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 112, Wood-based panels, the Secretariat of

15、 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 September 1999, and conflicting national standards shall be withdrawn at the latest by September 1999. According to the CEN/C

16、ENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

17、Switzerland and the United Kingdom. This standard is one of a series of standards for the classification of plywood by surface appearance. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Measurements 3 5 Apparatus 4 6 Method for measurement 4 7 Test report 6 Annex A (in

18、formative) Bibliography 6Page 3 EN 635-5:1999 BSI 08-1999 Table 1 Measurements required to classify the characteristics inherent in wood of plywood surfaces Category of characteristics Reference EN 635-2:1995 EN 635-3:1995 Number Size Diameter Length Width Area Pin knots 3.2.1.1 X Sound intergrown k

19、nots 3.2.1.2 XX Unsound or non-adhering knots and knots holes 3.2.1.3 XX Open splits 3.2.1.4XX X Abnormalities due to insects and marine borers 3.2.1.5 XXXX Resin pockets and inbark 3.2.1.6 X Irregularities in the structure of the wood, e.g. roughness 3.2.1.7 X Discolouration which is not wood destr

20、oying 3.2.1.8 X 1 Scope This European Standard specifies the methods for measuring and expressing: some inherent characteristics of wood; and some defects that come from the manufacturing process which are used for the classification of the appearance of plywood surfaces according to EN 635-1, EN 63

21、5-2 and EN 635-3. 2 Normative references This European 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 amen

22、dments 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. EN 313-2, Plywood Classification and terminology Part 2: Terminology. EN 326-1

23、, Wood-based panels Sampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results. EN 635-1, Plywood Classification by surface appearance Part 1: General. EN 635-2, Plywood Classification by surface appearance Part 2: Hardwood. EN 635-3, Plywood Classifi

24、cation by surface appearance Part 3: Softwood. 3 Definitions For the purposes of this standard the definitions of EN 313-2 and EN 635-1 apply. 4 Measurements For the purpose of determining the appearance class of plywood according to EN 635-1, EN 635-2 and EN 635-3, the following characteristics inh

25、erent in wood (see Table 1) and manufacturing defects (see Table 2) shall be measured for each surface classified, according to the methods described in clause 6 of this standard.Page 4 EN 635-5:1999 BSI 08-1999 Table 2 Measurements required to classify the manufacturing defects on plywood surfaces

26、Category of defects Reference EN 635-2:1995 EN 635-3:1995 Number Size Diameter Length Width Area Open joints 3.2.2.1XX Overlaps 3.2.2.2XX Hollows, imprints and bumps 3.2.2.4 X Roughness, other than that due to irregularities in the structure of the wood 3.2.2.5 X Sanding through 3.2.2.6 X Glue penet

27、ration 3.2.2.7 X Repairs 3.2.2.9 X Defects at the edges of the panel due to sanding or sawing 3.2.2.10 X 5 Apparatus For measuring the following apparatus is used: either a metal rule with a graduation of 1 mm; and a transparent or semi-transparent film printed with a rectangular grid; or any optica

28、l system, able to measure the requested quantities, i.e. lengths, widths, diameters and areas. 6 Methods for measurement 6.1 Quantity in number Quantities in number of characteristics and defects shall be related to the full panel surface area (panel length multiplied by panel width) with the only e

29、xceptions of open splits and open joints, for which the number shall be related to the panel width. 6.2 Diameter 6.2.1 The measurement shall be expressed to the nearest millimetre. 6.2.2 The diameter of knots and knot holes shall be measured as the distance between two opposite tangents plotted to t

30、he circumference of the knot (or hole) in a direction parallel to the wood fibre direction of the surface veneer (see Figure 1). a) Length direction of the panel Figure 1 Dimensions to be used to express the diameter (d) of knot holes and similar characteristics 6.3 Length 6.3.1 The measurement shal

31、l be expressed to the nearest millimetre. 6.3.2 The length of open splits shall be measured and expressed as the greatest dimension parallel to that of the wood fibre direction of the surface veneer see Figure 2a). 6.3.3 The length of anomalies due to insects and marine borers and the length of over

32、laps shall be measured and expressed as the maximum dimension, parallel or perpendicular to the wood fibre direction of the surface veneer see Figure 2b).Page 5 EN 635-5:1999 BSI 08-1999 a) Length direction of the panel Figure 3 Dimensions to be used to express the width (w) of characteristics and d

33、efects a) Length direction of the panel Figure 2 Dimensions to be used to express the length (l) of characteristics and defects 6.4 Width 6.4.1 The measurement shall be expressed to the nearest millimetre. 6.4.2 The width of an open split shall be measured at the edge of the panel and expressed as t

34、he dimension between two parallels in line with the length of the panel see Figure 3a). 6.4.3 The width of abnormalities due to insects and marine borers shall be measured and expressed as the minimum dimension either parallel or perpendicular to the wood fibre direction of the surface veneer see Fi

35、gure 3b). 6.4.4 The width of open joints, resin pockets and inbark shall be measured and expressed as the maximum dimension perpendicular to the length of the panel see Figure 3c). 6.4.5 The width of defects at the edges of the panels due to sanding and sawing shall be measured and expressed as the

36、maximum distance between the referred edge and the parallel tangent line to the defect see Figure 3d). 6.5 Area 6.5.1 General The area shall be expressed in square millimetres to the nearest 5 mm 2 . 6.5.2 Indirect measurement The area of the characteristic or defect can be measured indirectly by tr

37、acing its outline onto a transparent or semi-transparent film which is printed with a squared grid (see Figure 4). NOTE The extent of the roughness can be more easily seen and traced if it is first rubbed with a piece of chalk.Page 6 EN 635-5:1999 BSI 08-1999 The area shall be determined either by:

38、6.5.2.1 calculating the area within the trace outline by counting the number of squares enclosed; or 6.5.2.2 scanning the tracing with suitable electronic image identification equipment. 6.5.3 Direct measurement The area of the characteristic or defect can be measured directly using a suitable elect

39、ronic image identification equipment. Figure 4 Tracing of the outline of a characteristic or a defect on a transparent squared grid used to determine the area 7 Test report The test report shall be in accordance with EN 326-1 and shall include the following information: a) the category and type(s) o

40、f characteristic and defect measured; b) their number, length, width or area as appropriate; c) the method used for determination of the area 6.5.2.1, 6.5.2.2 or 6.5.3. Annex A (informative) Bibliography ENV 635-4, Plywood Classification by surface appearance Part 4: Parameters of ability for finish

41、ing Guideline.blankBS EN 635-5:1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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