EN 322-1993 en Wood-Based Panels - Determination of Moisture Content《木质板料 含湿度测定》.pdf

1、CEN EN*322 93 = 3404587 0043833 574 = EUROPEAN STANDARD NORME EUROPEENNE EUROPISCHE NORM February 1993 UDC 674.815:620.168.334 Descnptors: Wd-basd panel, fibreboard, particleboard, plywood. OSE. cement-bonded particleboard, test method. moisture content 1 EN 322:1993 English venion Wood-based panels

2、 - Determination of moisture content Panneaux base de bois - DCteniMtion de 1humiditC Holrwrkstoffe - Bestirwig des Feuchtegeholtes . This European Standard was approved by LEN on 1992-12-1s. CEN mbcrs are bound to comply with the CEWCENELEC Internal Regulations hich stipulate the ditions for giving

3、 this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographiul references concerning such MtiOMl standards nay be obtained on application to the Central Secretariat or to any CEN mbcr. The European Standards exist in three Official versions (Eng

4、lish, French, German). A version in any other language rade by translation under the responsibility of a CEN mkr into its ovn language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of atria, Belgium, Denmark, Finla

5、nd, France, Germany, Greece, Iceland, Ireland, Italy, Luxclbwrg, Netherlands, Norway, Portugal, Spain, Sweden, SuitrerLand and United Kingdom. European Committee for Standardization mit Europen de Normalisation Europisches Komitee fr Norung e 1993 Copyright reserved to CEN mbcrs Ref. No. EN 322:1993

6、 E . CEN ENlr322 93 m 3904589 004L8L4 q00 m Page 2 EN 322:1993 Conrwrtr &t PW *op8 . 4 Norutive references 1 Principle . 4 App8r8tUS . 4 Tat p$cCS . 5 Procedure . 5 Expresston of results 5 Estimrtion of board moisture Content 1 Test report . 5 Annex A (inforutive) Bibliography 6 . 9 CEN ENS322 93 34

7、04589 004l1815 347 Page 3 EN 322:1993 Foreword This European Standard was prepared by Working Group 4 “Common test methods* (Secretariat: United Kingdom) of Tachnical Committee CEN/TC 112, Wood-based panels (Secretariat: Germanv). The text is based on IS0 9425:1989 which has been elaborated with Eur

8、opean participation. Thisstandard 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 ._ No existing European Standard is superseded.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 Standard shall be given the status of a natonaI standard, either by publication

9、of an identical text or by endorsement, at the latest y August 1993. and conflicting 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.

10、Denmark. Finland. France. Germany. Greece. Iceland. keland. Italy. Luxemburg, Netherlands, Norway, Portugal. Spain. Sweden, Switzerland. United Kingdom. Page 4 EN 322:1993 .* . . -1 2 Norutive references This European Standard 1ntorporat.r by dated or undated reference. provirions from other publica

11、tionr. niare normative references an cited at the appropriate plues in te text ind the publications are listed hcca- after. For dated references, suesequant WndYnts to or reviriam of any of these piblie8tlms apply to this uropaan Standard, only when incorporated in it by .iaribit or revision. For un

12、dated references the latest edition of the publication referre to applies. EN 326-1 wood-basad panels - Swpiing. cutting 8nd inspaction - Part 1: Supling and cutting of test pieces and expression of test results *) 3 Principle et.riliMtiOfb by Ciaighing, of the loss of u of euh Zart piece ktcmn its

13、state 8t the time of supling cent- of te mass of the test piece after drying8 these results are used to estimate the misture content of whole boards. uid its State 8ftU drying t0 toriStUlt USS 8t (103 t 2) *C. md C81CUhtioci Of this 1OSS Of MSS 8S 8 per- 88lance, scale Interval 0.01 g. 4.2 Wylng wen

14、 Ventllited drying oven, capable of being controlled at (10s t 2) *C. 4.3 o.ricc8toc Stlie8 gel mtiining a desiccant. to uintair the air u clou 8s possible to the absolutoly dry coriditlon. CEN ENS322 93 = 3404587 0043837 LIT Page 5 EN 322:1993 5 Test pieces 1.1 -1iw and Cutting Saapling 8nd cutting

15、 of the test pieces shall be c8rried out in ucordance with E)I 3261. Test pieces shall cover the full thickness of the Ward. S.2 iaensions lhe test piece shall haw 8 ainiatm inithi 111s of 20 g: sh8pe 8nd size are uniaportuit. lhe tart piees shall be free from loose splinters and sawdust. 6 Procedur

16、e 6.1 Waighing mfora drying beigh each test piece in the as-rampled state to (in accuracy of 0.01 g. This initial weighing shall be c8rried out iMedi8tety after mapling oc where this ir impossible, prr cautions shall e taken to avoid changes in the iolsture content of the test piCu after rmpling. 6.

17、2 Drying reached. Constant mass is consided to 8e redd when the results of two successive weighing operatiom, carried out at an interval of 6 h, do not differ by #ca thin 0,l %of the IU of the test piece. Pl- th test pi- in tht drying OVOt (4.2) 8t 8 tari9cr.t- Of (103 f 2) *C Wtil COMtUlt US$ h8 be

18、en 6.3 oighing after drying After th. tart piecm haw been cooled to .pprowiutely coo. tywr8tun in the desiccator (4.31, aeigh each test piece to an 8ctw.y of 0.01 g, rapidly .nough to avoid an 4ncre.u In mittun tontent greater than 0.1 t. 7 Expnrrion of iwultr C8lculatc the moisture content H of euh

19、 test piece, as 8 pertantage by mass to the nearest 0.1 %, in ucordam with the following fOiw18: w-w % Hr- x 100 where q is the initial mr of the test piece, in grms ao is the nass of the test piece after drying, in grm 8 EStiMtiai, of board moist- content The moisture! content of 8 board shall be o

20、btained by C81CUlitng the arithm tents of a11 the test pieces taken from the sae bard and shall e expresse place. 9 test report As described in EN 326-1. Page 6 EN 322:1993 Annex A (informativ) Bibliography CEN EN*322 93 3404589 004318318 O56 EN 309 EN 313-1 EN 316 Particloboards - Definition and classification Plywood - Classification and Terminology - Part Ir Classification wood fibmb08rds - efinitioris, Cl8ssifiCatiOn and $*IS EN 633 Ccrant-bondad particleboards - Definition and clsrification a) ISO 9425 wood-based panels - Detenin.tion of moisture content I .- ./ , ,. ., V“ , . .:, ,