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1、BRITISH STANDARD BS EN 12248:1999 Sawn timber used in industrial packaging Permitted deviations and preferential sizes The European Standard EN 12248:1999 has the status of a British Standard ICS 55.160 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy
2、, (c) BSI BS EN 12248:1999 This British Standard, having been 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 October 1999 BSI 02-2000 ISBN 0 580 32671 3 National forewor
3、d This British Standard is the English language version of EN 12248:1999. The UK participation in its preparation was entrusted by Technical Committee B/543, Round and sawn timber, to Subcommitte B/543/3, Timber in pallets and packaging, which has the responsibility to: aid enquirers to understand t
4、he text; present to the responsible European committee 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 subcommittee can
5、 be obtained on request to its secretary. 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 using the
6、“Find” facility of the BSI Standards 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 immunity from l
7、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tab
8、le on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12248:1999 BSI 02-2000i Contents Page National forewordInside front cover Foreword2 Text of EN 12248
9、3 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12248 June 1999 ICS 55
10、.040; 79.040 English version Sawn timber used in industrial packaging Permitted deviations and preferential sizes Bois scis utiliss dans lemballage industriel Ecarts admissibles et dimensions prfrentielles Schnittholz in Industriepackmitteln Zulssige Abweichungen und Vorzugsmae This European Standar
11、d was approved by CEN on 2 May 1999. CEN members are bound to comply with the CEN/CENELEC 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 bibliographical references concerning such na
12、tional 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, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and
13、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, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerla
14、nd 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 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.
15、No. EN 12248:1999 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12248:1999 2 BSI 02-2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 175, Round and sawn timber, the Secretariat of which is held by A
16、FNOR. 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 1999. According to the CEN/CENELEC Internal Reg
17、ulations, 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, Switzerland and the
18、 United Kingdom. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions3 4Measurement3 5Changes in size due to changes in moisture content4 6Permitted deviations4 7Preferential sizes4 7.1General4 7.2Preferential sizes4 Table 1 Dimensions and their permitted deviations4 Tab
19、le 2 Preferential sizes4 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12248:1999 BSI 02-20003 Introduction This standard specifies permitted deviations and preferential sizes for sawn timber used in industrial packaging. A range of cro
20、ss-sections likely to be readily available is given to assist both producers and users. Preferential 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 f
21、or the measurement of moisture content. This reference moisture content of 20 % does not prevent manufacturers 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 thick
22、nesses and widths for sawn timber used in industrial packaging when measured at a defined reference 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 n
23、ormative references are cited at the appropriate places in the text and the publications are listed 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 r
24、eferences the latest edition of the publication referred to applies. EN 336, Structural timber Coniferous and poplar Sizes, permissible deviations. EN 844-4:1997, Round and sawn timber Terminology Part 4: Terms relating to moisture content. EN 844-6:1997, Round and sawn timber Terminology Part 6: Te
25、rms relating to dimensions of sawn timber. EN 1309-1, Round and sawn timber Method of measurement of dimensions Part 1: Sawn timber. prEN 13183-1, Round and sawn timber Method of measurement of moisture content Part 1: Method for determining moisture content of a piece of sawn timber (Oven-dry metho
26、d). prEN 13183-2, Round and sawn timber Method 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 ti
27、mber at the time of measurement EN 844-6:1997 3.2 moisture content mass of moisture in wood expressed as a percentage of its oven-dry mass EN 844-4:1997 3.3 moisture content size deviation difference between an actual size and the corresponding basic size, making allowance for the difference in size
28、 due to difference in moisture content according to this standard 3.4 permitted dimensional deviations the permissible variation of the actual size (length, width and/or thickness) from the referenced basic size resulting from sawing or processing 3.5 Target size, basic size For the purposes of this
29、 standard, basic size and target size are 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 844-6:1997 3.5.2 basic size size by which sawn timber is known or specified at a stated moisture
30、 content EN 844-6:1997 4 Measurement The measurement of the moisture content shall be carried out according to prEN 13183-1 or prEN 13183-2. The reference moisture content for measurement is 20 %. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c)
31、BSI EN 12248:1999 4 BSI 02-2000 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 width 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 e
32、very 1 % of moisture content below 20 %. The above values are typical, regardless of the species. 6 Permitted deviations The permitted deviations on thicknesses and widths at 20 % moisture content are specified in Table 1. Table 1 Dimensions and their permitted deviations 7 Preferential sizes 7.1 Ge
33、neral The sizes are measured according to EN 1309-1. 7.2 Preferential sizes Preferential sizes are given in Table 2. Table 2 Preferential sizes Dimensions mm Permitted deviations Thickness and/or width k 100 +3 1 Thickness and/or width 100 +4 2 Component length +1 3 NOTE 1These permitted deviations
34、are in accordance with class 1 of EN 336. NOTE 2More restrictive permitted deviations can be specified in contracts if necessary. Basic cross-sections Thicknesses mm Widths mm 75100125150175200225250300 16xx 18xxxx 22xxxxx 25xxxxxx 32xxxx 38xxxxxxxxx 50xxxxxxxxx 63xxxxxxx 75xxxxxxxxx 100xxxxxxx NOTE
35、Other dimensions can also be used in national rules. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 15:54:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12248:1999 BSI 389 Ch
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