1、STD-BSI BS EN LZZLiA-ENGL 1994 E Lb2Vbb9 0799439 281 BRITISH STANDARD Sawn timber used in industrial packaging - Permitted deviations and preferential sizes The European Standard EN 122481999 has the status of a British Standard ICs 55.160 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COP
2、YRIGHT LAW BS EN 12248: 1999 STD=BSI BS EN L22?4B-ENGL 5977 = lb24bb9 0797440 TT3 BS EN 122481999 direction of the Sector Amd.No. Date Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 National foreword
3、 Comments This British Standard is the English language version of EN 122481999. The UK participation in its preparation was entrusted by Technical Committee B/543, Round and sawn timber, to Subcommitte B/543, limber in pallets and packaging, which has the responsibility to: - aid enquirers to under
4、stand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organizations represented on this subco
5、mmittee can be obtained on request to its secrem. Cross-references 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 us
6、ing the ?Find? facility of the BSI Standascis Electronic Catalogue. 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 immuni
7、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. O BSI 10-1999 ISBN O 680 32671 3 i i STD=BSI BS
8、 EN 12248-ENGL 1777 E Lb24bb7 0777441 73T EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12248 June 1999 ICs 55.040; 79.040 English version Sawn timber used in industrial packaging - Permitted deviations and preferential sizes Bois scis utiliss dans lemballage industriel - Ecarts admissibles e
9、t dimensions prfrentielles Schnittholz in Industriepackmitteln - Zulssige Abweichungen und Vorzugsmae This European Standard was approved by CEN on 2 May 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard t
10、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 Cenal Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German)
11、. 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 oficial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finlan
12、d, 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 fur Normung Central Secretariat: rue de Stassart, 36 B-1050 Bru
13、ssels 8 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12248:1999 E Page 2 EN 12248:1999 Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Defuitions 4 Measurement 5 Changes in size due to changes in moistu
14、re content 6 Permitted deviations 7 Preferential sizes 7.1 General 7.2 Preferential sizes 3 3 3 3 4 4 4 5 5 5 5 Q BSI 1 O- 1999 STD-BSI BS EN L224A-ENGL 1999 LbZYbbS 0777443 702 W Page 3 EN 12248:1999 Foreword This European Standard has been prepared by Technical Committee CENRC 175, Round and sawn
15、timber, the Secretariat of which is held by AFNOR. 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 December 1999, and conflicting national standards shall be withdrawn at the latest by December 19
16、99. According to the CENKENELEC 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, P
17、ortugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction This standard specifies permitted deviations and preferential sizes for sawn timber used in industrial packaging. A range of cross-sections likely to be readily available is given to assist both producers and users. Preferentia
18、l sizes are recommended for the manufacture of industrial packaging. They are considered as basic sizes at a moisture content of 20 %. The standard also stipulates the use of electric moisture meters for the measurement of moisture content. This reference moisture content of 20 % does not prevent ma
19、nufachuers from manufacturing industrial packaging with either dry or green timber. 1 Scope This standard specifies permitted deviations (due to variability in sawing and processing) from target thicknesses and widths for sawn timber used in industrial packaging when measured at a defined reference
20、moisture content. It also gives preferential sizes of this timber. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These nonnative references are cited at the appropriate places in the text and the Publications are listed
21、hereafter. For dated references, subsequent amendments 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 336, Structural timber - Con
22、iferous and poplar - Sizes, permissible deviations. EN 844-4: 1997, Round and sawn timber - Terminology -Pan 4: Terms relating to moisture content. EN 844-6: 1997, Round and sawn timber - Terminology -Part 6: Terms relating to dimensions of sawn timber. EN 1309-1, Round and sawn timber -Method of me
23、asurement of dimensions -Part I: Sawn timber. prEN 13 183-1, Round and sawn timber-Method of measurement of moisture content - Part I: Method for determining moisture content of apiece of sawn timber (Oven-dry method). Q BSI 10-1999 Page 4 EN 12248:1999 prEN i 3 i 83-2, Round and sawn timber - Metho
24、d of measurement of moisture content - Part 2: Method for estimating moisture content of a piece of sawn timber (Electrical method). 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 actual size size of a piece of sawn timber at the time of measurement EN 844-6: 1
25、9971 3.2 moisture content mass of moisture in wood expressed as a percentage of its oven-dry mass EN 844-4: 19971 3.3 moisture content size deviation difference between an actual size and the corresponding basic size, making allowance for the difference in size due to difference in moisture content
26、according to this standard 3.4 permitted dimensional deviations the permissible variation of the actual size (length, width andor thickness) from the referenced basic size resulting from sawing or processing 3.5 target size, basic size for the purposes of this standard, basic size and target size ar
27、e the same 3.5.1 target size size desired after a particular production process (at a specified moisture content) to which the permitted deviations are related EN 844-619973 3.5.2 basic size size by which sawn timber is known or specified at a stated moisture content EN 844-6: 19971 4 Measurement Th
28、e measurement of the moisture content shall be carried out according to prEN 13 183-1 or prEN 13 i 83-2. The reference moisture content for measurement is 20 %. 5 Changes in size due to changes in moisture content Unless there is evidence to the contrary, it shall be assumed that the thickness and w
29、idth of a piece of timber increase by 0,25 % for every 1 % of moisture content from 20 % up to 30 %, and decrease by 0,25 % for every 1 % of moisture content below 20 %. The above values are typical, regardless of the species. 0 BSI 1 O- I999 Page 5 EN 12248:1999 Mmensions 6 Permitted deviations Per
30、mitted deviations The permitted deviations on thicknesses and widths at 20 % moisture content are specified in Table 1. Thickness andior width I 100 Thickness dor width 100 Component length +3 -1 4 -2 +I -3 NOTE 1 These permitted deviations are in accordance with class 1 of EN 336. NOTE 2 More restr
31、ictive permitted deviations can be specified in contracts if necessary. 7 Preferential sizes 7.1 General The sizes are measured according to EN 1309-1 7.2 Preferential sizes Preferential sizes are given in Table 2. Table 2 - Preferential sizes I Basic cross-sections 1 NOTE ther dimensions can also b
32、e used in national rules. Q BSI 10-1999 BS EN 12248:1999 BSI 389 Chiswick High Road London w4 4AIA BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It i
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