1、UDC 674.81 5 : 620.1 68.334 DEUTSCHE NORM August 1993 Wood-based panels Determination of moisture content English version of DIN EN 322 I EN322 Holzwerkstoffe; Bestimmung des Feuchtegehaltes Intended to supersede DIN 52375, August 1977 edition, and parts of DIN 52 351, September 1956 edition, and DI
2、N 52361, April 1965 edition. Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen) 03.94 DIN EN 322 Engl. Price group 4 Sales No. 11 O4 European Standard EN 322 : 1993 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword Th
3、is standard has been prepared by CEN/TC 112. The responsible German body involved in the preparation of this standard was the Normenausschu Holzwirtschaft und Mbel (Timber and Furniture Standards Committee), Technical Committee 2.15. This European Standard is part of a series of standards dealing wi
4、th wood-based panel products within the scope of the EC Directive on the approximation of the laws, regulations and administrative provisions of the Member States relating to construction products (89/106/EEC) and also serving to implement Eurocode No. 5 Design of timber products. Part 1-1: General
5、rules and rules for buildings. It is to be noted that not all of the DIN Standards dealing with requirements and methods of test for wood-based panel products need yet be withdrawn. This is in keeping with resolution 22/93 taken by CEN/BT, which states that where ?packages? of EN Standards are conce
6、rned, it shall be permitted for the relevant national standards to be valid for longer periods of time than usual, specifically, until the EN ?package? has been published in its entirety. In the case at hand, all of the relevant EN Standards have not yet been published, but the foreseen deadline for
7、 submitting them to Formal Vote has been set for 30 June 1994. CEN/TC 112 has therefore decided to extend the period of validity for relevant national standards until the end of 1994. Standards referred to See Normative references and Annex A. Previous editions DIN 52350: 10.43; DIN 52351: 09.53, 09
8、.56; DIN 52361: 01.55, 04.65; DIN 52375: 08.77 Amendments The specifications regarding the determination of moisture content as given in DIN 52351, September 1956 edition, DIN 52361, April 1965 edition, and DIN 52375, August 1977 edition, have been superseded by the specifications of EN 322. Interna
9、tional Patent Classification B 27 N 3/00 G O1 N 33/46 EN comprises 3 pages. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesCOPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesEUROPEAN STANDARD NORME EU
10、ROPENNE EUROPAISCHE NORM EN 322 February 1993 UDC 674.815 : 620.168.334 Descriptors: Wood-based panel, fibreboard, particleboard, plywood, OSB, cement-bonded particleboard, test method, moisture content. English version Wood-based panels Determination of moisture content Panneaux base de bois; dterm
11、ination de lhumidit Feuchtegehaltes Holzwerkstoffe; Bestimmung des This European Standard was approved by CEN on 1992-12-15. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard wit
12、hout any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language
13、made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Ita
14、ly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1993. Copyright reserved to all CEN member
15、s. Ref. No. EN 322 : 1993 E COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 2 EN 322: 1993 Contents Page 1 Scope . 2 2 Normative references . 2 3 Principle . 2 4 Apparatus 2 6 Procedure . 2 7 Expression of results 3 8 Estimation of board moistu
16、re content . 3 5 Test pieces . 2 9 Test report 3 Annex A (informative) Bibliography . 3 Foreword This European Standard was prepared by Working Group 4 Common test methods (Secretariat: BSI) of Technical Com- mittee CEN/TC 112 Wood-based panels, the Secretariat of which is held by DIN. The text is b
17、ased on International Standard IS0 9425 : 1989 which has been developed with European participation. This standard is one of a series of standards specifying methods of test for determining dimensions and properties of wood- based panels. No existing European Standard is superseded. This European St
18、andard shall be given the status of a national standard, either by publication of an identical text or by endorsement, by August 1993 at the latest, and conflicting national standards withdrawn, by December 1994 at the latest. In accordance with the CENKENELEC Internal Regulations, the following cou
19、ntries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. 1 Scope This European Standard specifies a method for deter- mining th
20、e moisture content of test pieces of wood-based panels. Such result may be used to estimate the moisture content of wood-based panels according to EN 326-1. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These nor- mativ
21、e references are cited at the appropriate places in the text and the publications are listed hereafter. For dated ref- erences, subsequent amendments to or revisions of any of these publications apply to this European Standard, only when incorporated in it by amendment or revision. For un- dated ref
22、erences, the latest edition of the publication re- ferred to applies. EN 326-1 Wood-based panels; sampling, cutting and in- spection. Part 1 : Sampling and cutting of test pieces and expression of test results) 3 Principle Determination, by weighing, of the loss of mass of each test piece between it
23、s state at the time of sampling and its state after drying to constant mass at (1 03 * 2) “C, and calcula- tion of this loss of mass as a percentage of the mass of the test piece after drying; these results are used to estimate the moisture content of whole boards. 4 Apparatus 4.1 Balance Balance, s
24、cale interval 0,Ol g. 4.2 Drying oven Ventilated drying oven, capable of being controlled at (1 03 2 2) OC. 4.3 Desiccator Silica gel containing a desiccant, to maintain the air as close as possible to the absolutely dry condition. 5 Test pieces 5.1 Sampling and cutting Sampling and cutting of the t
25、est pieces shall be carried out in accordance with EN 326-1. Test pieces shall cover the full thickness of the board. 5.2 Dimensions The test pieces shall have a minimum initial mass of 20 g: shape and size are unimportant. The test pieces shall be free from loose splinters and sawdust. 6 Procedure
26、6.1 Weighing before drying Weigh each test piece in the as-sampled state to an accu- racy of 0,Ol g. l) At present at the draft stage. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 3 EN 322 : 1993 This initial weighing shall be carried out im
27、mediately after sampling or, where this is impossible, precautions shall be taken to avoid changes in the moisture content of the test piece after sampling. 6.2 Drying Place the test pieces in the drying oven (4.2) at a tempera- ture of (103 * 2) “C until constant mass has been reached. Constant mas
28、s is considered to be reached when the re- sults of two successive weighing operations, carried out at an interval of 6 h, do not differ by more than 0,l % of the mass of the test piece. 6.3 Weighing after drying After the test pieces have been cooled to approximately room temperature in the desicca
29、tor (4.3), weigh each test piece to an accuracy of 0,Ol g, rapidly enough to avoid an increase in moisture content greater than 0,l %. 7 Expression of results Calculate the moisture content, H, of each test piece, as a percentage by mass, to the nearest 0,l %, in accordance with the following formul
30、a: m -m mo 100 H = HA where mH is the initial mass of the test piece, in g; mo is the mass of the test piece after drying, in g. 8 Estimation of board moisture content The moisture content of a board shall be obtained by calcu- lating the arithmetic mean of the moisture contents of all the test piec
31、es taken from the same board, and shall be ex- pressed as a percentage, to one decimal place. 9 Test report As described in EN 326-1. Annex A (informative) Bibliography EN 309 Particleboards; definition and classification EN 313-1 Plywood; classification and Terminology. Part 1 : Classification EN 3
32、16 Wood fibreboards; definitions, classification and symbols EN 633 Cement-bonded particleboards; definition and classification) IS0 9425 : 1989 Wood-based panels; determination of moisture content For ), see page 2. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling Services
