EN 322-1993 pdf download.Wood-based panels – Determination of moisture content.
This EN 322 specifies a method for determining the moistur, content of test pieces of ‘cod-based panels. Such result may be used to .stimat. the moisture Content of wood-based panels according to EN 326-1
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2 NormatIve references
This European Standard incorporates by dated or undated reference, provisions from other pl4cat4vns. maze normative rferences arm cited at the app4opri.t. places in the text and the pl4cations are list.d hereafter. For dated references. ,s.qunt amendments to or revisions of any of these pl 4cations apply to this European Standard, only an incorporated In it by amendment or revision. For undated references the latest edition of the publication referred to applies.
EN 326-1 Wood-based panels – Sl4ng, cutting and inspection – Part 1: Sampling end cutting of test pieces and expression of test results ‘)
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3 PrincIple
D.tersin*tion. by .eighing, of the loss of mass of each test plac. bet_an Its stat. at th. time of spllng and its stat, after drying to constant mass at (103 * 2) C and calculation of this loss of mess is a per— c.antag of the mass of the test piec. after drying3 these results are used to estimate the moisture content of whole boards.
4 Apparatus
4.1 S.l.nc.
S.lanc., scala interval O01 9.
4.2 DryIng n
Ventilated drying ov.n capable of bing controlled at (103 a 2) C. •
4.3 Desiccator
Silica gel containing a desiccant, to maintain the air as close as possible to th. absolutely dry condition.
5 Test places
S.l Sal4ng and cutting
Sampling end cutting of the test pieces shall be carried out in .cccrdanc• with EN 326—1. Teit pl.c.s sisall cover the full th1ckr*ss of the board.
5.2 Dimensions
Th. test piece shall have a ainiwu. initial mass of 20 Q: shape and size re .mi.portant. The test pieces shall be free fr loose splinters and sawdust.
6 Procedure
6.1 Weighing before di-ying
Wigh each test piece in the .5-sampled state to an accuracy of 0,01 g..
This initial ighing shall be carried out l.dlet.ly at te, simpling or ere thu is impossible, pr.cautions shall be taken to avoid changes in the .oisttre contint of the test piece after sling.
6.2 Drying
Place the test pi.c.s in th. drying oven (4.2) at a tper•tur. of (103 t 2) •C until constant ss ha. been reached.
Constant mass is considered to be reached idsen the results of ti succ.ssive weighing operations, carried out at an 1nteval of 6 h, do not differ by more than 0,1 * of the .aas of the test piece.
1.3 W.ing miter drying
After th. teat Pieces have been cooled to approximately room temperatur. In the deslcctot (4.)), weIgh
..ch test plec• to an accuracy of 0,01 g, rapidly enough to avoid en increas. in moisture content greater than 0.1 *.
7 ExpressIon of results
Calculate the moisture content Ii of each test piece. s a percentag. by mass to the nearest 0.1 *. In
Annex A (inforsatly) Sibi fogrephy
EN 309 Particlbomrds – Definitfon and classification
EN 313-1 Plywood — Claisific.tton and Terminology – Part ii Classification
EN 316 Wood fibreboards — Definitions, classification and sols
EN 633 Ca*ntbondd paiticleboards – Definition and clsslfication 1)
ISO 9425 Wood-based panels — Determination of .oistur content
1) At present at tte draft stag.EN 322-1993 pdf download.