EN 326-2:2010+A1:2014
(Main)Wood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control
Wood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control
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.
Holzwerkstoffe - Probenahme, Zuschnitt und Überwachung - Teil 2: Erstprüfung des Produktes und werkseigene Produktionskontrolle
Diese Europäische Norm legt Verfahren für die Erstprüfung des Produktes und die werkseigene Produk-tionskontrolle sowie für die Fremdüberwachung der Übereinstimmung von Holzwerkstoffen mit EN 13986 und anderen relevanten Produktnormen fest. Sie ist jedoch auch anwendbar für Holzwerkstoffe, die nicht zur Verwendung im Bauwesen vorgesehen sind, wenn der Hersteller dies vorsieht.
Diese Europäische Norm gilt nicht für die Bewertung der Übereinstimmung mit den Anforderungen bei Platten¬lieferungen. In solchen Fällen gilt EN 326-3.
Für die werkseigene Produktionskontrolle, falls erforderlich, werden Verfahren zur Bewertung der Über-einstimmung bei Chargen und bei der Fertigung über längere Zeiten angegeben.
Für die Fremdüberwachung, falls erforderlich, werden Verfahren zur Erstinspektion eines Werkes und einer Erstprü¬fung des Produktes sowie zur Überwachung der werkseigenen Produktionskontrolle angegeben.
Für die werkseigene Produktionskontrolle werden kleine Prüfköper verwendet. Die statistischen Nachweis-verfahren basieren auf einer Normalverteilung.
Panneaux à base de bois - Echantillonnage, découpe et contrôle - Partie 2 : Essai de type initial et contrôle de la production en usine
La présente Norme Européenne prescrit les méthodes pour les essais internes de type initial (ITT) et pour le contrôle de production interne en usine (CPU) ainsi que le contrôle externe des panneaux à base de bois vis-à-vis des exigences de la norme EN 13986 et des normes d’exigences produits pertinentes concernées. Cependant, la présente norme peut aussi s’appliquer, selon le choix du fabricant, aux panneaux à base de bois qui ne sont pas destinés à la construction.
La présente Norme Européenne ne s’applique pas à l’évaluation de la conformité au regard des spécifications des caractéristiques des panneaux faisant partie de livraisons. Dans ce cas, l’EN 326-3 s’applique.
Pour le contrôle interne de la production en usine, si nécessaire, les méthodes d’évaluation de la conformité des lots et de la production sur de longues périodes sont indiquées.
Pour le contrôle externe, si nécessaire, les méthodes de l’inspection initiale de l’usine et d’essai de type initial d’un produit, ainsi que les méthodes relatives à la surveillance du contrôle de la production en usine sont indiquées.
Pour le contrôle de production en usine, on utilise des petites éprouvettes. Les statistiques d’évaluation sont basées sur une distribution normale.
Lesne plošče - Vzorčenje, razžagovanje in kontrola - 2. del: Začetno preskušanje tipa in kontrola proizvodnje v obratu
Standard EN 326-2+A1 določa metode za notranje začetno preskušanje tipa (ITT) in notranjo kontrolo proizvodnje v obratu (FPC) ter za zunanjo kontrolo lesnih plošč za preverjanje njihove skladnosti s standardom EN 13986 ter drugimi ustreznimi specifikacijami izdelka. Vendar na željo proizvajalca lahko velja tudi za lesne plošče, ki se uporabljajo za negradbene namene. Ta evropski standard se ne uporablja za oceno skladnosti s specifikacijami plošč, zbranih v pošiljkah. V takih primerih se uporablja standard EN 326-3. Po potrebi so za notranjo kontrolo proizvodnje v obratu podane metode za oceno skladnosti serij in proizvodnje v daljšem obdobju. Po potrebi so za zunanjo kontrolo podane metode za začetno kontrolo obrata in začetno preskušanje tipa izdelka ter za nadzor kontrole proizvodnje v obratu. Pri kontroli proizvodnje v obratu se uporabljajo majhni preskusni delčki. Statistika vrednotenja temelji na normalni distribuciji.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzwerkstoffe - Probenahme, Zuschnitt und Überwachung - Teil 2: Erstprüfung des Produktes und werkseigene ProduktionskontrollePanneaux à base de bois - Echantillonnage, découpe et contrôle - Partie 2 : Essai de type initial et contrôle de la production en usineWood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 326-2:2010+A1:2014SIST EN 326-2:2011+A1:2014en,fr,de01-oktober-2014SIST EN 326-2:2011+A1:2014SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 326-2:2010+A1
August 2014 ICS 79.060.01 Supersedes EN 326-2:2010English Version
Wood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory production control
Panneaux à base de bois - Echantillonnage, découpe et contrôle - Partie 2 : Essai de type initial et contrôle de la production en usine
Holzwerkstoffe - Probenahme, Zuschnitt und Überwachung - Teil 2: Erstprüfung 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 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-CENELEC 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-CENELEC 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, 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 United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 Members. Ref. No. EN 326-2:2010+A1:2014 ESIST EN 326-2:2011+A1:2014
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) . 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.4.1 Example for the case that the first sample of one panel fulfils the panel characteristic requirement . 23 SIST EN 326-2:2011+A1:2014
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 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 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 variability . 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 determination 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 Bibliography . 43
5.2.3.1.2 Variability within panels of the ITT sample The mean standard deviation within panels of the ITT sample ITTws,, where "w" is indicating "within" panels, shall be derived from the standard deviation within each panel jws, of the sample [Equation (13)] according to Equation (5): SIST EN 326-2:2011+A1:2014
6.2.4 Sampling and cutting of test pieces The minimum number of test pieces m shall be cut from each panel as given either in EN 326-1 or in the EN for the relevant test method, or otherwise shall be agreed (see NOTE). NOTE This should be done with an inspection body. The principles of sampling and cutting of test pieces are described in EN 326-1. 6.3 Factory production control by variables 6.3.1 Characteristics The following shall be calculated and recorded for each characteristic: — the panel mean jx of the m test values ijx obtained from each single panel according to Equation (12): SIST EN 326-2:2011+A1:2014
the standard deviation within panels wsshall be taken from:
— either the rolling mean standard deviation within panels 30,ws [see Equation (16)];
— or the mean standard deviation within panels of the initial type testing ITTws, [see Equation (5)];
— or the mean standard deviation within the last n representative panels tested according to Equation (19): nssnjjjwnw∑===12,, (19) Only if none of these mean standard deviation within panels wsis available, the standard deviation within the last panel sampled (panel 1) 1,wsshall be used in Equations (17) and (18), respectively, by calculating according to Equation (20): ! 211111,()imiiwxxsm==−=−∑ (20) " The t-values in relation to the number of test pieces m are given in Table 1. SIST EN 326-2:2011+A1:2014
If the number of defectives found in the first sample is greater than the first acceptance number 1Ac in Table 4, but less than the first rejection number 1Re in Table 4, a second sample shall be inspected. If the number of defectives found in the first sample is equal to or greater than the first rejection number 1Re in Table 4, the inspection lot shall be rejected. The number of defectives found in the first and the second samples shall be accumulated. If the accumulated number of defectives is equal to or less than the second acceptance number 2Ac in Table 4, the inspection shall be considered acceptable. If the cumulative number of defectives is equal to or greater than the second rejection number 2Re in Table 4, the inspection lot shall be rejected. 6.4.4 Internal records of an established product 6.4.4.1 Control charts The history of an established product type under inspection shall be given by recording the test results according to 6.3 on a continuous basis by using control charts, e.g. Shewhart control charts as given in ISO 8258. SIST EN 326-2:2011+A1:2014
Example of initial type testing by variables – Evaluation of bending strength of particleboards (see 5.2) A.1 Example This example deals with the initial type testing of bending strength for a 18 mm particleboard of type P4 according to EN 312:2003 with a lower specification limit of L = 15 N/mm2. A.2 Sampling (see 5.1.2) 12 panels (nitt = 12) are sampled, see Table A.1. Table A.1 — Sampling for initial inspection by variables Panel no. Product line Date of production Number of panels 1 2 1 week 1 2 3 4 1 week 2 2 5 6 1 week 3 2 7 8 2 week 1 2 9 10 2 wee
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