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BS EN 00326-2-2010 scan

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BS EN 00326-2-2010 scan

BS EN 326-22010 Wood-based panels -Sampli ng, cutting and inspection Part 2 Initial type testing and factory production control II.{ I.J NO COPYING WITHOUT BSI PE RMISSION EXCEPT AS PERM lnED BY COPYRIGHT LAW . raising standards worldwidem . BS EN 326-22010 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 326-22010. It supersedes BS EN 326-22000 which is withdrawn. The UK participation in its preparation was entrusted to Techn ical Committee B/541, Wood based panels. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2010 ISBN 978 0 580 60365 5 ICS 79 .060.01 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Pol icy and Strategy Committee on 31 December 2010. Amendments issued since publication Date Text affected EUROPEAN STANDARD NORME EUROPEENNE EUROpAlSCHE NORM ICS 79.060.01 BS EN 326-22010 EN 326-2 September 2010 Supersedes EN 326-22000 English Version Wood-based panels - Sampling, cutting and inspection - Part 2 Initial type testing and factory production control Panneaux a base de bois - Echantillonnage, decoupe et controle - Partie 2 Essai de type initial et controle de la production en usine Holzwerkstoffe - Probenahme, Zuschnitt und Oberwachung - Teil2 ErstprOfung des Produktes und werkseigene Produktionskontrolle Th is European Standard was approved by CEN on 7 August 2010. CEN members are bound to comply Yvith 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 CEN Management Centre 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, SVJitzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROpAISCHES KOMITEE FOR NORMUNG Management Centre Avenue Marnix 17, B-1 000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved mrldVJide for CEN national Members. Ref. No. EN 326-22010 E BS EN 326-22010 EN 326-22010 E Contents Page Foreword 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Symbols and indices . 7 4.1 Letter symbols see also EN 326-1 1994 . 7 4.2 Indices see also EN 326-1 1994 9 5 Initial type testing ITT . 9 5.1 General 9 5.2 Initial type testing by variables 9 5.2.1 General 9 5.2.2 Sampling of panels . 10 5.2.3 Evaluation 10 5.3 Initial type testing by attributes . 12 5.3.1 Sampling 12 5.3.2 Evaluation 12 6 Factory production control 13 6.1 General . 13 6.2 Sampling 13 6.2.1 General . 13 6.2.2 Dimensional tolerances, squareness and edge straightness 13 6.2.3 Other properties assessed as attributes and not included in 6.2.1 or 6.2.2 . 13 6.2.4 Sampling and cutting of test pieces . 14 6.3 Factory production control by variables 14 6.3.1 Characteristics 14 6.3.2 Product types 14 6.4 Control of production . 15 6.4.1 General . 15 6.4.2 Factory production control by variables for batch production . 15 6.4.3 Factory production control by attributes for batch production . 17 6.4.4 Internal records of an established product 19 6.5 Initial inspection of factory and factory production control FPC 19 6.6 Continuous surveillance, assessment and approval of the factory production contro. 20 Annex A informative Example of initial type testing by variables - Evaluation of bending strength of particleboards see 5.2 21 A.1 Example . 21 A.2 Sampling see 5.1.2 . 21 A.3 Test results, records and evaluation see 5.2.3 and EN 326-1 1994, Clause 7 . 21 Annex B informative Factory production control by variables - Example Batch production see B.1 B.2 B.3 B.4 B.4.1 6.4.2 . 23 General . 23 Sampling 23 Testing . 23 Calculation and recording of test results of the first sample 23 Example for the case that the first sample of one panel fulfils the panel characteristic requirement . 23 B.4.2 Example for the case that the first sample of one panel does not fulfil the panel characteristic requirement. 24 2 BS EN 326-22010 EN 326-22010 E Annex C informative Example of initial type testing attributes - Evaluation of bonding quality of C.l C.2 C.3 C.4 C.4.1 C.4.2 C.4.3 C.5 plywood see 6.4.3.1} . 27 Example 27 Sampling plan 27 Sampling see 5.3 .1 27 Test data and evaluation of bond shear strength and apparent cohesive wood fibre failure percentage . 27 General . 27 First sample . 28 Second sample 29 Single sampling plan . 30 Annex 0 informative Control of factory production control records - Examples of the 0.1 0.1 .1 0.1.2 0.2 0.2.1 0.2.2 0.3 0.3.1 0.3.2 0.3.3 0.4 determination of differences between factory testing and external testing see 6.6 31 General . 31 Use of unconditioned test pieces 31 Paired testing . 31 Example 1 Swelling in thickness tested according to EN 317 32 Sample of example 1 } . 32 Control of variability 32 Example 2 Internal bond tested according to EN 319 34 General . 34 Sample of example 2} . 34 Control of variability 34 Determination of a significant difference between the results from the alternative test procedure and from the standard reference test method . 35 Annex E informative Example of the calculation of a linear correlation see 7.2 . 37 Annex F informative Example of the determination of a significant difference between the results from the alternative test procedure and from the standard reference test method see 6.4.5 in accordance with EN 13986 . 40 F.l General . 40 F.2 Control of variability see Annex D . 41 F.3 Determination of a significant difference see Annex D . 41 Bibliography 42 3 BS EN 326-22010 EN 326-22010 E Foreword This document EN 326-22010 has been prepared by Technical Committee CENfrC 112 “Wood-based panels“, the secretariat of which is held by DIN. 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 March 2011 , and conflicting national standards shall be withdrawn at the latest by March 2011 . Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 326-22000. A revision of EN 326-22000 was necessary in order to adapt this standard to the harmonized European Standard EN 139862004. Compared to EN 326-22000 the following main changes have been made a the procedures of initial type testing as well as of factory production control have been adapted to those specified in EN 13986; b the terminology has been adapted to EN 13986; c the specification requirement of the lower 5 value or the upper 95 value, respectively, is also fulfilled, if all sing le 30 mean values comply with the specification limit; d the procedure of evaluation of linear correlations between test results has been improved. This standard is one of a series of European Standards dealing with sampling, cutting and inspection of wood based panels. The other parts of this series are listed in Clause 2 and in the Bibliography. According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 4 1 Scope BS EN 326-22010 EN 326-22010 E This European Standard specifies methods for internal initial type testing ITT and internal factory production control FPC as well as external control of wood-based panels for their compliance with EN 13986 and other relevant product specifications. However, it may also apply, at the option of the manufacturer, to wood-based panels applied for non-construction purposes. This European Standard is not applicable for the assessment of compliance with specifications of panels comprised in consignments. In such cases, EN 326-3 applies. For internal factory production control, if required, methods for the assessment of conformity of batches and of production over longer periods are given . For external control, if required, methods for the initial inspection of a factory and initial type testing of a product, and for the surveillance of the factory production control, are given. In the factory production control small test pieces are used. The statistics of evaluation is based on normal distribution. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. EN 326-1 1994, Wood-based panels - Sampling, cutting and inspection - Part 1 Sampling and cutting of test pieces and expression of test results EN 13986, Wood-based panels for use in construction - Characteristics, evaluation of conformity and marking ISO 8258, Shawhart control charts 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN 326-1 1994 and the following apply. 3.1 acceptable quality level AQL maximum percentage of non-conforming panels that for the purpose of sampling inspection can be considered satisfactory as a process average 3.2 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 the panel has an equal chance of being selected as a test piece 3.3 attribute qualitative panel characteristic which can be taken for a yes or no decision about the conformity of a panel characteristic with the specification requirements NOTE An example is given in Annex C. 5 BS EN 326-22010 EN 326-22010 E 3.4 batch panels of the same product type produced in a shift 3.5 defective panel which does not meet the required specification limit of the relevant characteristic 3.6 inspection body body which is responsible for external control 3.7 inspection by attributes inspection whereby either the unit of product is classified simply as conforming or non-conforming, or the number of nonconformities in the unit of product is counted, with respect to a given requirement or set of requirements 3.8 inspection by variables inspection whereby the conformity of a panel characteristic can be measured on a continuous scale 3.9 inspection lot for factory control portion of production which is presented for sampling and inspection, consisting of panels of the same type, normally within the same thickness range, coming from the same production line and manufactured under essentially the same conditions 3.10 inspection lot size N number of panels in one inspection lot 3.11 lower specification limit L value required by the EN specification that 95 of the panels should have values greater than or equal to 3.12 panel piece of wood-based sheet material large enough to permit the cutting of test pieces 3.13 percent defective extent of non-conformity of a panel product expressed by percentage defective panels in the total number of panels inspected 3.14 production site single production line 3.15 product type panel type, irrespective of thickness, as defined in the relevant EN specification 3.16 reference population wood-based panels for which the relationship between test values is relevant 6 3.17 quality characteristic BS EN 326-22010 EN 326-22010 E characteristic that is essential for the evaluation of a product or product type in accordance with a relevant EN specification 3.18 sample collection of panels wh ich are drawn from an inspection lot NOTE Unless otherwise agreed. the panels of the sample are drawn at random. 3.19 test piece piece of panel cut to the size required for testing a specific characteristic 3.20 test value Xii single value or measurement of a specific characteristic obtained from a test piece 3.21 thickness range panels with a thickness for which the same specification limits are valid according to the relevant EN specification 3.22 upper specification limit U value required by the EN specification that 95 of the panels should have values lower than or equal to 3.23 variable test value or measurement which can be measured on a continuous scale 4 Symbols and indices 4.1 Letter symbols see also EN 326-11994 Ac Acceptance number A QL Acceptable quality level a Linear correlation constant b Linear correlation factor Ccoov Conversion factor F Statistical factor L Lower specification limit In Number of test pieces cut from each single panel of the sample, in either test direction n Sample size number of panels 7 BS EN 326-22010 EN 326-22010 E N r Re s“ s/ji s6.r Sw . } 2 S - I Xi ,a t 2 S - if xj,re Number of panels in one inspection lot, i.e. inspection lot size Correlation coefficient; coefficient of linear regression Rejection number Estimate of the standard deviation of a characteristic between panel means Xj Estimate of the standard deviation of the relative differences of the panel means liij Standard deviation between panel differences Estimate of the standard deviation of a characteristic within a panel} of the sample Variance of panel means of the alternative testing procedure Variance of panel means of the reference standard test Statistical factor, see Table 1 U Upper specification limit t5 Relative difference tJ. Absolute difference v wJ Coefficient of variation within a panel } of the sample Vi Coefficient of variation between the panel means Xj rp,om Linear conversion function X ij Single test value or measurement X j Mean value of the m test values or measurements obtained from a single panel} x“ Grand mean of n single panel mean values X j.a“ Test value of the population of the alternative test procedure Xj.,,

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