EN 324-1-1993 pdf download.Wood-based panels —Determination of dimensions of boards Part 1: Determination of thickness, width and length.
This EN 324-1 specifies methods for ineasunng the thickness, width and length of wood-based panels.
It applies to whole flat boards.
The methods for the determination of squareness and edge straightness are specified in EN 324-2.
2 Normative references
This European Standard incorporates by dated or 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 when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 322, Wood-based panels — Determination of moisture content.
EN 326-1, Wood-based panels — Sa,nplin.g cutting and inspection — Part 1: Sampling and cutting of test pieces and expression of test results1.
3 Principle
Thickness, length and width of full size boards are determined by linear measurement.
4 Sampling
Sampling of panels shall be in accordance with
EN 326-1.
5 Moisture content at time of measurement
Normally the dimensions of boards are measured in the as-received state.
If necessary the moisture content of the boards shall be determined in accordance with EN 322.
6 Conditioning
If necessary, the boards shall be conditioned to constant mass in an atmosphere with a relative humidity of(65 ± ) % and a temperature of (20 ± 2) °C. Constant mass is considered to be reached when the results of two successive weighing operations, carried out at an interval of 21 h, do not differ by more than 0,1 % of the mass of the board.
7.1 Instrument for thickness measurement Micrometer, or sun liar measuring instrument, having flat and parallel circular measuring surfaces of(16 J 1) mm diameter and an operating force of 4 N ± 1 N. The graduation of the apparatus shall allow a reading to 0,05 mm.
7.2 Measuring instrument for length and width measurement
Steel measuring tape, accurate to 1 mm.
8 Procedure
81 Determination of thickness of boards Measure the thickness approximately 50 mm from the edges, at points located in each corner and in the middle of each side, i.e. at eight points in all (see Figure 1), to an accuracy of 1 % of the thickness but to not less than 0.1 mm.
For measuring the thickness, apply the measuring surfaces of the instrument slowly to the panel surface.
8.2 Determination of length and width of boards
Measure both the length and width of each board along two lines parallel to and at a distance of 100 mm from the edges (see Figure 1), to an accuracy of 0,1 % but not less than 1 mm.
9 Expression of res tilts
9.1 Thickness
For each board tested, the arithmetic mean of the measurements shall be calculated and expressed to the nearest 0,1 mm.
9.2 Length and width.EN 324-1-1993 pdf download.