1、BRITISH STANDARD BS EN 326-1:1994 Wood-based panels Sampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results The European Standard EN 326-1:1994 has the status of a British Standard UDC 674.03:674.815:620.113BSEN 326-1:1994 This British Standard, ha
2、ving been prepared under the directionof the Technical Sector Boardfor Building and Civil Engineering, was published underthe authority of the Standards Board and comes intoeffect on 15 June 1994 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference B/541
3、Draft for comment 90/15999 DC ISBN 0 580 21844 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinsti
4、tut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland
5、 Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normali
6、zacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 326-1:1994 BSI 08-1999 i Contents Page Cooperating organizations Inside front
7、 cover National foreword ii Foreword 2 Text of EN 326-1 3 National annex NA (informative) Committees responsible Inside back coverBSEN 326-1:1994 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Technical Sector Board for Building and Civil Engineer
8、ing and is the English language version of EN326-1:1993, Wood-based panels Sampling, cutting and inspection Part1: Sampling and cutting of test pieces and expression of test results. It is one of three standards dealing with sampling, cutting and inspection; the remaining two are: EN 326-2, Wood-bas
9、ed panels Sampling, cutting and inspection Part 2: Quality control in the factory; and EN 326-3, Wood-based panels Sampling, cutting and inspection Part 3: Inspection of a consignment of panels. These three standards provide sampling plans and statistical procedures for verifying compliance with all
10、 the EN specifications for wood-based panels, under the chosen method of assessment given in the title of the separate Part standards. These Part standards, fulfil the same function to this group of ENs as BS6566-3 and the relevant clauses of BS1142 and BS5669-1 to BS5669-4. However the procedures a
11、re fundamentally different and cannot be used as alternatives to the existing British Standards. This standard, together with a number of other ENs, will form a series of BSENs in the field of wood-based panels, superseding BS1142, BS5669 and BS6566. A British Standard does not purport to include al
12、l 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 comprises a front cover, an inside front cover, pages i and
13、 ii, theEN title page, pages 2 to 10, an inside back cover 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 table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 326-
14、1 February 1994 UDC 674.03:674.815:620.113 Descriptors: Wooden boards, sampling, test specimens, cutting, test results English version Wood-based panels Sampling, cutting and inspection Part1: Sampling and cutting of test pieces and expressionof test results Panneaux base de bois Echantillonnage, dc
15、oupe et contrle Partie1: Echantillonnage et dcoupe des prouvettes expression des rsultats dessai Holzwerkstoffe Probenahme, Zuschnitt und berwachung Teil1: Probenahme und Zuschnitt der Prfkrper sowie Angabe der Prfergebnisse This European Standard was approved by CEN on1994-02-07. CEN members are bo
16、und 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 national standards may be obtained on application to the
17、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 notified to the Central Secretariat has the same status
18、 as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit
19、 Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 326-1:1994 EEN 326-1:1994 BSI 08-1999 2 Foreword This European Standard has been prepared by CEN/TC112, Woodbased panels, the secretari
20、at of which is held by DIN. It was submitted to Formal Vote and the result was positive. 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 August1994, and conflicting national standards shall be wit
21、hdrawn at the latest by December1994. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swed
22、en, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Symbols 3 4 Definitions 3 5 Sampling 4 6 Test pieces 4 7 Expression of test results 5 8 Test report 7 Annex A (informative) Example for a cutting plan for plywood bonding quality tests 8 Annex B (inform
23、ative) Bibliography 9 Figure 1 Example of a cutting plan for small test pieces for determination of certain properties (thickness of the panel about 20 mm) 6 Table 1 Minimum number m of small test pieces cut from each single panel 4 Table 2 Single-sided t-values in relation to the sample size n 7EN
24、326-1:1994 BSI 08-1999 3 1 Scope This European Standard specifies certain rules for the sampling and cutting of test pieces and the expression and presentation of test results, in orderto obtain information on the properties of wood-based panels. NOTEThis standard does not cover the sampling and cut
25、ting of test pieces for the derivation of characteristic values for structural design. These tests have to be carried out on medium-sized test pieces according to the rules given in EN789 using the minimum number of panels to be sampled according to EN384. 2 Normative references This European Standa
26、rd 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 amendments to or revisions of any of these publications apply to t
27、his European Standard, only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 322, Wood-based panels Determination of moisture content. EN 323, Wood-based panels Determination of density. 3 Symbols 3.1 Letter symbol
28、s 3.2 Indices 4 Definitions For the purpose of this standard, the following definitions apply: drawn at random sampling of panels in such a way that each panel of the inspection lot has an equal chance of being selected, and cutting of test pieces from a single panel in such a way that each part of
29、the panel has an equal chance of being selected as a test piece inspection lot a proportion of production, which is presented at a given time for sampling and inspection, consisting of panels of the same type within the same thickness range and coming from the same production line inspection lot siz
30、e number of panels in one inspection lot quality characteristic a property that is essential for the judgement of a product in accordance with a relevant EN specification sample a collection of panels which are drawn from an inspection lot. Unless otherwise agreed, the panels of the sample are drawn
31、 at random m Number of test pieces cut from each single panel of the sample, in each direction n Number of panels taken as sample = size of the sample N Number of panels in one inspection lot = inspection lot size L q 5%, U q 5% Lower and upper 5 % quantile values of the sample, respectively s Estim
32、ate of the standard deviation calculated from test values or measurements s 2 Estimate of the variance calculated from test values or measurements s w , j 2 Estimate of the variance within a panel j of the sample Estimate of the standard deviation between panel means Estimate of the variance between
33、 panel means Estimate of the mean variance within panels s x s x 2 s w 2 t n Single-sided 5 %-t-value of a normally distributed sample of n panels x ij , x ijkl Single test value or measurement Mean value (arithmetic mean) of the m single test values (or measurements) or of a group k and/or l of tes
34、t values (or measurements), obtained from a single panel j Grand mean; mean value (arithmetic mean) of all mn test values (or measurements) or of a group k and/or l of test values (or measurements), obtained from a sample i Serial test piece number within a panel (i = 1, 2, ., m) j Test panel identi
35、fication number within a sample (j = 1, 2, ., n) k, l Marks identifying the grouping of test pieces with regard to the direction in the plane of the panel and to their surfaces, respectively w Property within a panel L Lower specification limit U Upper specification limit x j , x jkl = x , = x kl EN
36、 326-1:1994 4 BSI 08-1999 measurement the value of a specific quality characteristic obtained either from a test piece or from a direct measurement test piece a piece of panel cut to the size required for testing a specific property test value the value of a specific quality characteristic obtained
37、from a test piece variable a test value or measurement which can be measured on a continuous scale 5 Sampling 5.1 Sampling of panels The size of the sample n depends on the purpose of the determination of panel properties. Detailed information on the size of the sample for quality control in the fac
38、tory is given in EN326-2, and for the inspection of the performance of a consignment of panels in EN326-3. Alternatively, the sample size may be specified in the relevant EN specification. 5.2 Sampling of test pieces Due to the variability both within and between panels, it is necessary to test a ce
39、rtain number of panels n as well as a certain number of test piecesm, cut from a single panel, in order to obtain reliable results. Examples of the minimum number of test pieces m are given inTable 1, for other panel properties m shall be as laid down in the relevant EN for the respective test metho
40、d. Table 1 Minimum number m of small test pieces cut from each single panel For the determination of those properties which differ in the two principal directions of the plane of the panel, two groups of m test pieces shall be cut from each panel. One group shall have its longitudinal axis parallel
41、to the direction of the production (or the length of the panel), the other shall have its longitudinal axis perpendicular to this direction. In testing the bonding quality of plywood, m relates to a pair of glue lines and to each pretreatment (seeAnnex A). 6 Test pieces 6.1 The test pieces shall be
42、cut from the individual panels to the dimensions specified in the relevant standards of test methods, using a suitable method to ensure unbiased selection. At least one test piece of each group of test pieces shall be cut from the edge of the trimmed panel after any edge profiling and/or protective
43、treatment has been removed. 6.2 An example of a cutting plan for small is test pieces given in Figure 1. Except for plywood bonding quality tests, for which a cutting plan is given in Annex A, the minimum distance between two test pieces for the same test shall be100mm. This requirement may be waive
44、d if replacement test pieces are required. 6.3 All test pieces cut from a panel shall be marked on the same surface with: the test panel identification number; the test piece serial number; and if possible, the original length direction and the original upper or lower surface of the panel. 6.4 For p
45、anels which are asymmetric about the centre of their thickness, so that the test result is influenced by which surface is uppermost when tested (e.gbending strength), half of the total number of test pieces m (i.e.m/2) shall be tested in each surface orientation. In all other cases where the orienta
46、tion of the surface of the panel is of minor influence on the property tested, the position of the upper or lower surface during the test shall be chosen at random. 6.5 Cutting of test pieces shall be carried out in such a way that their edges are clean, without burns, and perpendicular to the plane
47、 of the panel. Panel property EN standard m Moisture content EN 322 4 Dimensional movement EN 318 Density EN 323 6 Modulus of elasticity in bending and bending strength EN 310 Internal bond EN 319 8 Swelling in thickness after immersion in water EN 317 Surface soundness EN 311 Plywood bonding qualit
48、y EN 314-2 10EN 326-1:1994 BSI 08-1999 5 7 Expression of test results 7.1 Each specific property of each panel of the sample shall be determined as specified in the relevant EN using either test pieces or measurements taken from whole panels. 7.2 The test results of each individual test piece, from
49、each panel of the sample, shall be reported. 7.3 With the exception of testing the bonding quality of plywood 1) , further evaluation of the test results of the sample (either for inspection procedures or for internal as well as external production control) shall be made using the following calculations: 7.3.1 Mean value of each individual panel (panel mean) For each group of test pieces (or measurements, respectively) calculate the mean value of each individual panel ac
