1、BRITISH STANDARDBS EN 14755:2005Extruded particleboards SpecificationsThe European Standard EN 14755:2005 has the status of a British StandardICS 79.060.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g5
2、5g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14755:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 11 January 2006 BSI 11 January 2006ISBN 0 580 47532 8National forewordThis British Standard is the official English languag
3、e version of EN 14755:2005.The UK participation in its preparation was entrusted to Technical Committee B/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-referencesThe British Standards w
4、hich implement international or European publications referred to in this document may be found in the 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 public
5、ation does not purport to include all the necessary provisions of a contract. Users are responsible for 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 internationa
6、l/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pa
7、ges 2 to 14, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14755October 2005ICS 79.060.20English VersionE
8、xtruded particleboards - SpecificationsPanneaux de particules extruds - Exigences Strangpressplatten - AnforderungenThis European Standard was approved by CEN on 8 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europ
9、eanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, Fr
10、ench, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republ
11、ic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONE
12、UROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14755:2005: EEN 14755:2005 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3
13、 Terms and definitions.5 4 Symbols and abbreviations5 5 Requirements 5 5.1 General 5 5.2 General 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 vari
14、ations.9 Annex B (informative) Supplementary properties13 Bibliography.14 EN 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 st
15、atus of 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 fo
16、llowing 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, Swe
17、den, Switzerland and United Kingdom. EN 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 terms of service class 1 of EN 1995-1-1 which is characterized by a moisture c
18、ontent 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 EN 335-3. 2 Normative references The following referenced documents are indis
19、pensable 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, Wood-based panels Determination of formaldehyde content Extraction method ca
20、lled 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 in water EN 319, Particleboards and fibreboards Determination of tensile streng
21、th 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: Sampling and cutting of test pieces and expression of test results EN 326-2,
22、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 EN 14755:2005 (E) 5 3 Terms and definitions For the purposes of this European Standard, the
23、following terms and definitions apply. 3.1 solid density density of the board without the tubes 3.2 panel density density of the board 3.3 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 dens
24、ity more or equal to 550 kg/m3. ET: Extruded Tubes: Board with tubes with solid density more or equal to 550 kg/m3and cheek thickness more than or equal to 5 mm. ESL: Extruded Solid Light: Board without tube and with a density less than 550 kg/m3. ETL: Extruded Tubes Light: Board with tubes and with
25、 a solid density less than 550 kg/m3or cheek thickness less than 5 mm. 5 Requirements 5.1 General Each board shall comply with the 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 ac
26、cordance 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 requirements General requirements are given in Table 1. EN 14755:2005 (E) 6 Table 1 General requirements No Property Test method Requirement 1 Moisture content at dispatch
27、EN 322 5 % to 13 % 2 Tolerance on the mean solid density within a board EN 323 15 % 3aFormaldehyde potential Class E 1 Perforator value Steady state emission valuebEN 120 or EN 717-1 8 mg/100 g oven dry board Release 0,124 mg/m3air Class E 2cPerforator value Steady state emission valuebEN 120 or EN
28、717-1 8 mg/100 g oven dry board 30 mg/100 g oven dry board Release 0,124 mg/m3airaThe 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
29、 which can be calculated from the following 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 ex
30、ternal inspection. cIn certain countries 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 (5thpercentile values) as given in table 2: EN 14755:2005 (E) 7 T
31、able 2 Minimum values of mechanical properties Board type Thickness range Bending strength perpendicular to fabrication Tensile strength parallel to fabrication (mm) (N/mm2) (N/mm2) 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 0,17 ESL ETL All thicknesses 1 1 0,1 0,1 6 Supplementa
32、ry 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 controlled using intervals between tests not exceeding
33、 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 relating to formaldehyde potential (perforator value) sh
34、all 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 between tests Moisture content for each type of bo
35、ard 24 h Formaldehyde potentiala 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 week aCertain types of particleboards are known to
36、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. EN 14755:2005 (E) 8 8 Marking Each panel or package shall be clearly mark
37、ed by the manufacturer by indelible direct printing with at least the following information in this sequence: a) manufacturers name, trade mark, or identification mark; b) number of this European Standard EN 14755; c) panel type e.g. ET; d) nominal thickness; e) formaldehyde class; f) batch number,
38、or the production week and year. EN 14755:2005 (E) 9 Annex A (normative) Test 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
39、the bending moment M, at the maximum load Fmax, to the moment of its full cross-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, l1(length) = 1
40、0 thickness of the panel; 45 mm thickness 70 mm; b (width) = 50 mm, l1(length) = 8 thickness; total length of the test pieces l2= l1+ 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 stre
41、ngth A.2.1 Principle The internal bond is determined by submitting a test 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. EN 14755:2005 (E) 10 A.2.2 Sampling and d
42、imensions 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 mm The total l
43、ength 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 p
44、iece l test piece length F force t test piece thickness Figure A.2 Internal bond test EN 14755:2005 (E) 11 A.2.3 Apparatus See EN 319. A.2.4 Procedure See EN 319. A.2.5 Expression of results See EN 319. The surface of the test piece is the cross section minus the area of the tubes. A.3 Dimensional v
45、ariations A.3.1 Principle The dimensional variations of the board are determined by submitting the test pieces to two hours swelling in cold water. A.3.2 Sampling Take 3 test pieces of 100 mm x 100 mm perpendicular to the production line. One in the centre and two from the edges. A.3.3 Apparatus See
46、 EN 317. A.3.4 Procedure Measure the test pieces dimensions in the fabrication direction to an accuracy of 0,1 mm. Immerse the test pieces with their faces vertically and in the fabrication direction in clean still water having a pH (7 1) and a temperature of (20 1) C. The upper edges of the test pi
47、eces shall be covered by (25 5) mm of water throughout the test. After immersion, take the test pieces out the water, remove excess water and measure the test pieces dimensions in the fabrication direction. A.3.5 Expression of results A.3.5.1 For each test piece The dimensional variations of each te
48、st piece Vtexpressed as a percentage of original dimension shall be calculated according to the following equation: 100)- (001t=lllV (A.1) where l1is the dimension after immersion in millimetres, l0is the dimension before immersion in millimetres. EN 14755:2005 (E) 12 A.3.5.2 For board The dimension
49、al variations of board is the arithmetic mean of the results of all test pieces taken from the board and shall be expressed in percent, to one decimal. EN 14755:2005 (E) 13 Annex B (informative) Supplementary properties According to the customer request, the following properties can be determined: thickness of the extruded board (EN 324-1); squareness of the extruded board (EN 324-2); Dimensional variations in swelling. EN 14755:2005 (E) 14 Bibliography 1 EN 324-1, Wood-based panels
