1、CEN ENx339 93 = 3404589 0043773 756 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 319 February 1993 UDC 674.03 : 674.815.674.817 : 620.172 Descriptors: Particleboard, fibreboard, cement-bonded particleboard, test method, transverse tensile strength, internal bond English version Particleboard
2、s and fibreboards - Determination of tensile strength perpendicular to the plane of the board Panneaux de particules et panneaux de fibres - Dtermination de la rsistance la traction perpendiculaire aux faces du panneau Spanplatten und Faserplatten - Bestimmung der Zugfestigkeit senkrecht zur Platten
3、bene 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 without any alteration. Up-to-date lists and bibliographical refe
4、rences 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 made by translation under the responsibility of a CEN member i
5、nto 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, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
6、Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 319 : 1993 E CEN ENx319 93 m 3404589 0043794 892 m Pa
7、ge 2 EN 319 : 1993 Foreword This European Standard was prepared by Working Group 1 Particleboards (Secretariat: Germany) and Working Group 3 Fibreboards (Secretariat: Italy) of Technical Committee CEN/TC 112 Wood-based panels (Secretariat: Germany). This standard is one of a series specifying method
8、s of test for determining the properties of particleboards and fibreboards. No existing European Standard is superseded. 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 August 1993, and conflictin
9、g national standards shall be withdrawn at the latest by December 1994. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Net
10、herlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents 1 Scope 2 Normative references 3 Principle 4 Apparatus 6 Test pieces 6 Procedure 7 Expression of results 8 Test report Annex A (informative) Bibliography Page 3 3 3 3 3 5 5 5 6 CEN ENS3L9 93 = 3404589 0043795 729 Page 3
11、 EN 319 : 1993 1 Scope This European Standard specifies a method for determining the resistance to tension perpendicular to the plane of the board (internal bond) of particleboards, fibreboards, and cement-bonded particleboards. 2 Normative references This European Standard incorporates by dated or
12、undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only w
13、hen incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 325 Wood-based panels - Determination of dimensions of test pieces Sampling, cutting and inspection - hot melt, epoxy, PVAC, UF, phenol-resorcinol glues with hardwood
14、 and hardwood-plywood blocks. Certain glues are not suitable for bonding test pieces which have been subjected to a cyclic test in humid conditions or an immersion-in-water test. If the test pieces are bonded to their loading blocks after such a pretreatment they may be lightly sanded top and bottom
15、 to remove any roughness which has occurred during pretreatment. At present at the draft stage. (EN ENS319 93 3404589 004179b bb5 mge 4 EN 319 : 1993 t I 1 Metal testing block t max. I I L 50 4 2 Testing block (metal, hardwood or hardwood plywood) 3 Hardwood plywood testing block (not suitable for t
16、hin boards) 4 Test piece 5 Self-aligning ball-and-socket-joint t = 10 mm minumum for metal testing blocks t = 15 mm minimum for hardwood and hardwood plywood blocks Dimensions in millimetres Figure 1. Examples of apparatus for testing tensile strength perpendicular to the plane of the board CEN EN*3
17、L9 93 m 3404589 0041797 5TL m The tests shall not be carried out until the glue has had sufficient time to cure, so that the rupture does not occur in the glueline, and until the test pieces have regained an equal distribution of moisture. By experience, approximately 24 h are sufficient if hot-melt
18、 or epoxy glues are used, and approximately 72 h, if other glues are used. During this time, the glued assembly shall be stored under controlled conditions of (65 f 5) % relative humidity and a temperature of (20 * 2) OC. %st pieces shall be tested not more than 1 hour after removal from the conditi
19、oning environment. Conditioning is not applicable to test pieces or glued assemblies which have been subjected to a cyclic test in humid conditions or an immersion-in-water test and which are tested in the humid stage. NCVrE. When thin boards ( 800 kg/m3) are tested, it is recommended to use metal b
20、locks, since experience has shown that the results are more variable with wooden blocks in these cases. 6 Procedure 6.1 Application of the load Place the testing assembly in the grips and apply a force until rupture occurs. The load shall be applied at a constant rate of crosshead-movement throughou
21、t the test. The rate of loading shall be adjusted so that the maximum load is reached within (60 f 30) s. 6.2 Measurement of failing load Record the maximum load sustained by the test piece with a precision of 1 %. Reject the results from any test pieces that exhibit partial or total glueline failur
22、e or failure in the testing block. In this case, the test shall be repeated using new test pieces. Page 5 EN 319 : 1993 7 Expression of results 7.1 For a test piece %mile strength perpendicular to the plane of the board of each test piece, Al, expressed in N/mm2 to two decimals, is calculated accord
23、ing to the following formula: Fmax ftl = where: Fma, is the breaking load, in Newtons; a, b is the length and width of the test piece, in millimetres. 7.2 For a board The transverse tensile strength of the board is the mean value of all results obtained from the test pieces from that board, expresse
24、d in N/mm2 to two decimals. 8 Test report According to EN 326- 1. CEN EN*31i9 93 3404589 0043798 438 Page 6 EN 319 : 1993 Annex A (informative) Bibliography EN 309 Wood particleboards Definition and cMfieation EN 316 Wood fibreboards Definition, cMfieation and sgmbols EN 633 Cement-bonded particleboards Definition and cldficationl) ) At present at the draft stage.
