1、BSI Standards PublicationWood-based panels Sampling, cutting andinspectionPart 2: Initial type testing and factoryproduction controlBS EN 326-2:2010+A1:2014BS EN 326-2:2010+A1:2014National forewordThis British Standard is the UK implementation of EN 326-2:2010+A1:2014. It supersedes BS EN 326-2:2010
2、, which is withdrawn.The start and finish of text introduced or altered by amendment is in-dicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“.The UK participation in its preparation
3、was entrusted to Technical 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.T
4、he British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 84514 7ICS 79.060.01Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3
5、1 December 2010.Amendments/corrigenda issued since publicationDate Text affected31 August 2014 Implementation of CEN amendment A1:2014BRITISH STANDARDEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 326-2:2010+A1 August 2014 ICS 79.060.01 Supersedes EN 326-2:2010English Version Wood-based panels
6、 - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control Panneaux base de bois - Echantillonnage, dcoupe et contrle - Partie 2 : Essai de type initial et contrle de la production en usine Holzwerkstoffe - Probenahme, Zuschnitt und berwachung - Teil 2: Erstprf
7、ung des Produktes und werkseigene Produktionskontrolle This European Standard was approved by CEN on 7 August 2010 and includes Amendment 1 approved by CEN on 17 July 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe
8、an 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions
9、(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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belg
10、ium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switze
11、rland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
12、 Members. Ref. No. EN 326-2:2010+A1:2014 EBS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 2 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) .8 5 Initia
13、l 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 9 5.2.3 Evaluation 10 5.3 Initial type testing by attributes . 11 5.3.1 Sampling 11 5.3.2 Evaluation 12 6 Factory production control 12 6.1 General . 12 6.2 Sampling 13 6.2.1 Genera
14、l . 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 . 13 6.3 Factory production control by variables 13 6.3.1 Characteristics 13 6.3.2 Product types 14
15、 6.4 Control of production . 14 6.4.1 General . 14 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 18 6.5 Initial inspection of factory and factory produc
16、tion control (FPC) 19 6.6 Continuous surveillance, assessment and approval of the factory production control . 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 r
17、esults, records and evaluation (see 5.2.3 and EN 326-1:1994, Clause 7) 22 Annex B (informative) Factory production control by variables Example: Batch production (see 6.4.2) . 23 B.1 General . 23 B.2 Sampling 23 B.3 Testing . 23 B.4 Calculation and recording of test results of the first sample 23 B.
18、4.1 Example for the case that the first sample of one panel fulfils the panel characteristic requirement . 23 BS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 3 B.4.2 Example for the case that the first sample of one panel does not fulfil the panel characteristic requirement . 24 Annex C (informati
19、ve) Example of initial type testing attributes - Evaluation of bonding quality of plywood (see 6.4.3.1) . 27 C.1 Example 27 C.2 Sampling plan 27 C.3 Sampling (see 5.3.1) 27 C.4 Test data and evaluation of bond shear strength and apparent cohesive wood fibre failure percentage . 27 C.4.1 General . 27
20、 C.4.2 First sample . 27 C.4.3 Second sample 29 C.5 Single sampling plan . 29 Annex D (informative) Control of factory production control records - Examples of the determination of differences between factory testing and external testing (see 6.6) 30 D.1 General . 30 D.1.1 Use of unconditioned test
21、pieces 30 D.1.2 Paired testing . 30 D.2 Example (1): Swelling in thickness tested according to EN 317 31 D.2.1 Sample of example (1) . 31 D.2.2 Control of variability 31 D.3 Example (2): Internal bond tested according to EN 319 33 D.3.1 General . 33 D.3.2 Sample of Example (2) 33 D.3.3 Control of va
22、riability 33 D.4 Determination of a significant difference between the results from the alternative test procedure and from the standard reference test method . 34 Annex E (informative) Example of the calculation of a linear correlation (see 6.6) . 36 Annex F (informative) Example of the determinati
23、on of a significant difference between the results from the alternative test procedure and from the standard reference test method (see 6.6) in accordance with EN 13986 40 F.1 General . 40 F.2 Control of variability (see Annex D) 41 F.3 Determination of a significant difference (see Annex D) 42 Bibl
24、iography 43 BS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 4 Foreword This document (EN 326-2:2010+A1:2014) 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 a national standard, ei
25、ther by publication of an identical text or by endorsement, at the latest by February 2015, and conflicting national standards shall be withdrawn at the latest by February 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN
26、and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1 approved by CEN on 17 July 2014. This document supersedes !EN 326-2:2010“. The start and finish of text introduced or altered by amendment is indicated in the text by tags !
27、“. !This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association.“ A revision of EN 326-2:2000 was necessary in order to adapt this standard to the harmonized European Standard EN 13986:2004. Compared to EN 326-2:2000 the following m
28、ain 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, respectiv
29、ely, is also fulfilled, if all single 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 p
30、anels. The other parts of this series are listed in Clause 2 and in the Bibliography. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech R
31、epublic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. B
32、S EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 5 1 Scope 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 spe
33、cifications. 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.
34、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 surveillanc
35、e 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 documents, in whole or in part, are normatively referenced in this document and are indisp
36、ensable for its application. 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
37、and expression of test results EN 13986, Wood-based panels for use in construction Characteristics, evaluation of conformity and marking ISO 8258, Shewhart 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 appl
38、y. 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,
39、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 specificat
40、ion requirements BS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 6 NOTE An example is given in Annex C. 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 whi
41、ch 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 i
42、nspection 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 thic
43、kness 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 o
44、r 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
45、.15 product type panel type, irrespective of thickness, as defined in the relevant EN specification BS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 7 3.16 reference population wood-based panels for which the relationship between test values is relevant 3.17 quality characteristic characteristic th
46、at is essential for the evaluation of a product or product type in accordance with a relevant EN specification 3.18 sample collection of panels which 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
47、 size required for testing a specific characteristic 3.20 test value xijsingle 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 u
48、pper 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 326-1:1994) Ac Acceptance numb
49、er AQL Acceptable quality level a Linear correlation constant b Linear correlation factor cconvConversion factor F Statistical factor L Lower specification limit m Number of test pieces cut from each single panel of the sample, in either test direction n Sample size (number of panels) BS EN 326-2:2010+A1:2014EN 326-2:2010+A1:2014 (E) 8 N Number of panels in one inspection lot, i.e. inspection lot size r Correlation coefficient; coefficient of linear regression Re Rejection number xs Estimate of the standard deviation of a characteristic between panel means jx xsEst
