1、BRITISH STANDARD BS EN 14755:2005 Extruded particleboards Specifications The European Standard EN 14755:2005 has the status of a British Standard ICS 79.060.20 Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIBS EN 14755:2005 This British Standard was published un
2、der the authority of the Standards Policy and Strategy Committee on 11 January 2006 BSI 11 January 2006 ISBN 0 580 47532 8 National foreword This British Standard is the official English language version of EN 14755:2005. The UK participation in its preparation was entrusted to Technical Committee B
3、/541, Wood based panels, which has the responsibility to: A list of organizations represented on this committee can 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
4、BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible fo
5、r its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interes
6、ts informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright notice displayed in this docum
7、ent indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN14755 October2005 ICS79.060.20 EnglishVersion Extrudedpart
8、icleboardsSpecifications PanneauxdeparticulesextrudsExigences StrangpressplattenAnforderungen ThisEuropeanStandardwasapprovedbyCENon8July2005. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithouta
9、nyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCEN
10、memberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,
11、Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCE
12、NnationalMembers. Ref.No.EN14755:2005:E Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Terms and definitions.5 4 Symbols and abbreviations5 5 Requirements 5 5.1 General 5 5.2 Gen
13、eral requirements .5 5.3 Mechanical properties 6 6 Supplementary properties7 7 Factory production control 7 8 Marking 8 Annex A (normative) Test methods of bending strength, internal bond and dimensional variations.9 Annex B (informative) Supplementary properties13 Bibliography.14 Licensed Copy: Wan
14、g Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 3 Foreword This European Standard (EN 14755:2005) has been prepared by Technical Committee CEN/TC 112 “Wood based panels”, the secretariat of which is held by DIN. This European Standard shall be given the status of
15、 a national standard, either by publication of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
16、 countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Sw
17、itzerland and United Kingdom. Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 4 1 Scope This European Standard specifies the requirements for non load-bearing extruded particleboards for use in dry conditions. NOTE Dry conditions are defined in
18、terms of service class 1 of EN 1995-1-1 which is characterized by a moisture content in the material corresponding to a temperature of 20C and a relative humidity of the surrounding air only exceeding 65% for a few weeks per year. Boards of this type are only suitable in biological hazard class 1 of
19、 EN 335-3. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 120
20、, Wood-based panels Determination of formaldehyde content Extraction method called the perforator method EN 310, Wood-based panels Determination of modulus of elasticity in bending and of bending strength EN 317, Particleboards and fibreboards Determination of swelling in thickness after immersion i
21、n water EN 319, Particleboards and fibreboards Determination of tensile strength perpendicular to the plane of the board EN 322, Wood-based panels Determination of moisture content EN 323, Wood-based panels Determination of density EN 326-1, Wood-based panels Sampling, cutting and inspection Part 1:
22、 Sampling and cutting of test pieces and expression of test results EN 326-2, Wood-based panels Sampling, cutting and inspection Part 2: Quality control in the factory EN 717-1, Wood-based panels Determination of formaldehyde release Part 1: Formaldehyde emission by the chamber method Licensed Copy:
23、 Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 5 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 solid density density of the board without the tubes 3.2 panel density density of the board 3.
24、3 cheek thickness shortest distance between the edge of a tube and the panel surface 4 Symbols and abbreviations ES: Extruded Solid: Board without tube with a density more or equal to 550 kg/m 3 . ET: Extruded Tubes: Board with tubes with solid density more or equal to 550 kg/m 3and cheek thickness
25、more than or equal to 5 mm. ESL: Extruded Solid Light: Board without tube and with a density less than 550 kg/m 3 . ETL: Extruded Tubes Light: Board with tubes and with a solid density less than 550 kg/m 3or cheek thickness less than 5 mm. 5 Requirements 5.1 General Each board shall comply with the
26、requirements given in Tables 1 and 2. The requirements in Table 2 shall be met by 5 percentile values based on the mean values for individual boards and calculated in accordance with EN 326-1. In the case of all properties they shall be equal to or greater than the values in Table 2. 5.2 General req
27、uirements General requirements are given in Table 1. Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 6 Table 1 General requirements No Property Test method Requirement 1 Moisture content at dispatch EN 322 5 % to 13 % 2 Tolerance on the mean sol
28、id density within a board EN 323 15 % 3 aFormaldehyde potential Class E 1 Perforator value Steady state emission value bEN 120 or EN 717-1 8 mg/100 g oven dry board Release 0,124 mg/m 3air Class E 2 cPerforator value Steady state emission value bEN 120 or EN 717-1 8 mg/100 g oven dry board 30 mg/100
29、 g oven dry board Release 0,124 mg/m 3air aThe perforator values apply to boards with moisture contents H of 6,5 %. In the case of particleboards with different moisture content (in the range of 3 % H 10 %) the perforator value shall be multiplied by a factor F which can be calculated from the follo
30、wing equation: F = 0,133 H + 1,86 bRequired for initial type testing other than for established products where initial type testing may also be done on the basis of existing data with EN 120 or EN 717-1 testing, either from factory production control or from external inspection. cIn certain countrie
31、s only products of class E1 are allowed. 5.3 Mechanical properties For the determination of mechanical properties, apply test methods given in Annex A. Each panel shall respect the minimum values (5 thpercentile values) as given in table 2: Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006,
32、Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 7 Table 2 Minimum values of mechanical properties Board type Thickness range Bending strength perpendicular to fabrication Tensile strength parallel to fabrication (mm) (N/mm 2 ) (N/mm 2 ) ES 16 16 50 4 3 0,17 0,17 ET 30 30 45 45 70 2,5 1,7 1 0,17 0,17 0,1
33、7 ESL ETL All thicknesses 1 1 0,1 0,1 6 Supplementary properties On request, supplementary properties can be given. See Annex B (informative). 7 Factory production control Factory production control shall be carried out according to EN 326-2. The properties listed in the Tables 1 and 2, shall be con
34、trolled using intervals between tests not exceeding the intervals given in Table 3. Sampling shall be carried out at random. Alternative test methods and/or unconditioned test pieces may be used if a valid correlation to the specified test methods can be proven (see EN 326-2). Each requirement relat
35、ing to formaldehyde potential (perforator value) shall be met by the 95 percentile value based on test values of individual boards. The 95 percentile value shall be equal to or less than the respective tabulated values given in Table 1. Table 3 Maximum interval between test Property Maximum interval
36、 between tests Moisture content for each type of board 24 h Formaldehyde potential a Class E 1 Class E 2 24 h per type of board (ES or ESL and ET or ETL) 1 week per type of board Density for each type of board 8 h Internal bond for each type of board 1 month Bending strength for each type of board 1
37、 week aCertain types of particleboards are known to release little or no formaldehyde. In these cases, the test intervals may be increased. However, it remains the responsibility of the manufacturer or inspection agency, if any, to ensure compliance with this European Standard. Licensed Copy: Wang B
38、in, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 8 8 Marking Each panel or package shall be clearly marked by the manufacturer by indelible direct printing with at least the following information in this sequence: a) manufacturers name, trade mark, or identification
39、mark; b) number of this European Standard EN 14755; c) panel type e.g. ET; d) nominal thickness; e) formaldehyde class; f) batch number, or the production week and year. Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 9 Annex A (normative) Test
40、methods of bending strength, internal bond and dimensional variations A.1 Bending strength A.1.1 Principle The bending strength perpendicular to the fabrication of each test piece is calculated by determining the ratio of the bending moment M, at the maximum load F max , to the moment of its full cr
41、oss-section. A.1.2 Sampling and dimensions of test pieces From each test panel, 5 test pieces perpendicular to the fabrication line are taken. Dimensions of the test pieces; thickness 45 mm: b (width) = 50 mm, l 1(length) = 10 thickness of the panel; 45 mm thickness 70 mm; b (width) = 50 mm, l 1(len
42、gth) = 8 thickness; total length of the test pieces l 2= l 1+ 50 mm. A.1.3 Apparatus See EN 310. A.1.4 Procedure See EN 310. The loading head shall be located above a web. A.1.5 Expression of results See EN 310. A.2 Tensile strength A.2.1 Principle The internal bond is determined by submitting a tes
43、t piece to a uniformly distributed tensile force until rupture occurs. The internal bond of the board is determined by the maximum load in relation to the surface area of the test piece. Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSIEN 14755:2005 (E) 10 A.2.2 S
44、ampling and dimensions of test pieces From each test panel, 5 test pieces parallel to the fabrication line are taken. Test pieces width b: ES b = 50 mm ET b = 2 tubes and 3 webs (see Figure A.1) Figure A.1 Test piece for determination of internal bond Test pieces length l: ES l = 120 mm ET l = 200 m
45、m The total length shall be l + (2 length of the grips). If the opening of the grips are shorter than the board thickness, a hardwood block with 50 mm length and 4 mm thickness can be added to each side of the test piece (see Figure A.2). Dimensions in millimetres Key 1 hardwood block b test piece width 2 test piece l test piece length F force t test piece thickness Figure A.2 Internal bond test Licensed Copy: Wang Bin, na, Tue Apr 18 02:17:25 BST 2006, Uncontrolled Copy, (c) BSI
