1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 326-2:2010Wood-based panels Sampling, cutting andinspectionPart 2: Initial type testing and factoryproduction controlLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS,
2、25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 326-2:2010. Itsupersedes BS EN 326-2:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/541, Wood base
3、d panels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 60365 5ICS 79.060.01Compliance wi
4、th a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/
5、03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 326-2 September 2010 ICS 79.060.01 Supersedes EN 326-2:2000English Version Wood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control
6、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: Erstprfung des Produktes und werkseigene Produktionskontrolle This European Standard was approved by CEN
7、on 7 August 2010. CEN members are bound 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 ma
8、y 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 C
9、EN 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,
10、 Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploit
11、ation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 326-2:2010: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010EN 326-2:2010 (E) 2 Contents Page Foreword 41 Scope 52 Normative references 53 T
12、erms and definitions .54 Symbols and indices .74.1 Letter symbols (see also EN 326-1:1994) .74.2 Indices (see also EN 326-1:1994) 95 Initial type testing (ITT) .95.1 General 95.2 Initial type testing by variables 95.2.1 General 95.2.2 Sampling of panels . 105.2.3 Evaluation 105.3 Initial type testin
13、g by attributes . 125.3.1 Sampling 125.3.2 Evaluation 126 Factory production control 136.1 General . 136.2 Sampling 136.2.1 General . 136.2.2 Dimensional tolerances, squareness and edge straightness 136.2.3 Other properties assessed as attributes and not included in 6.2.1 or 6.2.2 . 136.2.4 Sampling
14、 and cutting of test pieces . 146.3 Factory production control by variables 146.3.1 Characteristics 146.3.2 Product types 146.4 Control of production . 156.4.1 General . 156.4.2 Factory production control by variables for batch production . 156.4.3 Factory production control by attributes for batch
15、production . 176.4.4 Internal records of an established product 196.5 Initial inspection of factory and factory production control (FPC) 196.6 Continuous surveillance, assessment and approval of the factory production control . 20Annex A (informative) Example of initial type testing by variables Eva
16、luation of bending strength of particleboards (see 5.2) 21A.1 Example . 21A.2 Sampling (see 5.1.2) . 21A.3 Test results, records and evaluation (see 5.2.3 and EN 326-1:1994, Clause 7) . 21Annex B (informative) Factory production control by variables Example: Batch production (see 6.4.2) . 23B.1 Gene
17、ral . 23B.2 Sampling 23B.3 Testing . 23B.4 Calculation and recording of test results of the first sample 23B.4.1 Example for the case that the first sample of one panel fulfils the panel characteristic requirement . 23B.4.2 Example for the case that the first sample of one panel does not fulfil the
18、panel characteristic requirement . 24Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010EN 326-2:2010 (E) 3 Annex C (informative) Example of initial type testing attributes - Evaluation of bonding quality of plywood (see 6.4.3.1) . 27C.
19、1 Example 27C.2 Sampling plan 27C.3 Sampling (see 5.3.1) 27C.4 Test data and evaluation of bond shear strength and apparent cohesive wood fibre failure percentage . 27C.4.1 General . 27C.4.2 First sample . 28C.4.3 Second sample 29C.5 Single sampling plan . 30Annex D (informative) Control of factory
20、production control records - Examples of the determination of differences between factory testing and external testing (see 6.6) 31D.1 General . 31D.1.1 Use of unconditioned test pieces 31D.1.2 Paired testing . 31D.2 Example (1): Swelling in thickness tested according to EN 317 32D.2.1 Sample of exa
21、mple (1) . 32D.2.2 Control of variability 32D.3 Example (2): Internal bond tested according to EN 319 34D.3.1 General . 34D.3.2 Sample of example (2) . 34D.3.3 Control of variability 34D.4 Determination of a significant difference between the results from the alternative test procedure and from the
22、standard reference test method . 35Annex E (informative) Example of the calculation of a linear correlation (see 7.2) . 37Annex 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
23、 (see 6.4.5) in accordance with EN 13986 . 40F.1 General . 40F.2 Control of variability (see Annex D) . 41F.3 Determination of a significant difference (see Annex D) . 41Bibliography 42Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010
24、EN 326-2:2010 (E) 4 Foreword This document (EN 326-2:2010) 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, either by publication of an identical text or by endor
25、sement, 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 identifyi
26、ng any or all such patent rights. This document supersedes EN 326-2:2000. 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 main changes have been made: a) the procedures of initial typ
27、e 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 single 30 mean values comply
28、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
29、 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 Republic, Denmark, Estonia, Finland, France, Germany, Greece,
30、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326
31、-2:2010EN 326-2:2010 (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 specifications. However, it
32、 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 pro
33、duction 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 product
34、ion 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
35、 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 i
36、n 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 apply. 3.1 acceptable quality level AQL maximum percentage of non-confor
37、ming 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 ea
38、ch 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. Licensed Copy:
39、 Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010EN 326-2:2010 (E) 6 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 inspectio
40、n 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 req
41、uirements 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 withi
42、n 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
43、 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 pr
44、oduction 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 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrol
45、led Copy, (c) BSIBS EN 326-2:2010EN 326-2:2010 (E) 7 3.17 quality characteristic 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 which are drawn from an inspection lot NOTE Unless otherwi
46、se 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 xijsingle value or measurement of a specific characteristic obtained from a test piece 3.21 thickness range panels with a thickness f
47、or 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 con
48、tinuous scale 4 Symbols and indices 4.1 Letter symbols (see also EN 326-1:1994) Ac Acceptance number 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 si
49、ngle panel of the sample, in either test direction n Sample size (number of panels) Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 25/03/2011 02:49, Uncontrolled Copy, (c) BSIBS EN 326-2:2010EN 326-2:2010 (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 betw
