1、 Reference number ISO 27567:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 27567 First edition 2009-05-01 Laminated veneer lumber Measurement of dimensions and shape Method of test Lamibois Mesurage des dimensions et forme Mthode dessai ISO 27567:2009(E) PDF disclaimer This PDF file may contain embedded
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6、r. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedISO 27567:2009(E) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for St
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11、27567 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 3, Plywood. INTERNATIONAL STANDARD ISO 27567:2009(E) ISO 2009 All rights reserved 1Laminated veneer lumber Measurement of dimensions and shape Method of test 1 Scope This International Standard describes the meth
12、ods for determining the thickness, length, width, spring, bow, twist and section squareness and cupping of test pieces of structural laminated veneer lumber (LVL), as specified in ISO 18776. 2 Normative references The following referenced documents are indispensable for the application of this docum
13、ent. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2074, Plywood Vocabulary ISO 18776, Laminated veneer lumber (LVL) Specifications ISO 16979, Wood-based panels Determination of mois
14、ture content 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2074 apply. 4 Moisture content To meet the requirements of this International Standard, the test pieces shall have a moisture content of (10 4) % as determined in accordance with ISO 16979.
15、 5 Apparatus 5.1 Determination of thickness. 5.1.1 Suitable linear measuring instrument, i.e. a screw micrometer. 5.1.2 Vernier calipers or dial gauge, having flat and parallel measuring surfaces with a contact area of between 30 mm 2and 300 mm 2 , reading to an accuracy of 0,1 mm. 5.2 Determination
16、 of length and width. 5.2.1 Suitable linear measuring instrument, reading to an accuracy of 0,5 mm. ISO 27567:2009(E) 2 ISO 2009 All rights reserved5.3 Determination of spring. 5.3.1 Thumbtacks or drawing pins, at least two, or staple gun and staples. 5.3.2 Blocks, two, with flat surfaces, for which
17、 the difference in thickness does not exceed 0,1 mm. NOTE Blocks of 30 mm 15 mm 20 mm have been found to be suitable. 5.3.3 Wire or cord, strong and thin. 5.3.4 Suitable linear measuring instrument, reading to an accuracy of 0,5 mm. 5.4 Determination of bow. 5.4.1 Surface, nominally flat, near horiz
18、ontal, larger than the piece by at least 25 mm in each direction. 5.4.2 Suitable linear measuring instrument, reading to an accuracy of 0,5 mm. 5.4.3 Masses, totalling (85 5) kg. 5.5 Determination of twist. 5.5.1 Surface, nominally flat, near horizontal, larger than the piece by at least 25 mm in ea
19、ch direction. 5.5.2 Suitable linear measuring instrument, reading to an accuracy of 0,5 mm. 5.6 Determination of squareness of section. 5.6.1 Square, with legs at least 25 mm longer than the width of the test piece to be measured, with the tolerance for out-of-squareness of the legs of the square be
20、ing 1 mm/m. 5.6.2 Suitable linear measuring device, capable of measuring gaps to an accuracy of 0,1 mm. 5.7 Determination of cupping. 5.7.1 Linear measuring device, capable of measuring gaps to an accuracy of 0,1 mm. 5.7.2 Straight edge. 6 Procedure 6.1 General The moisture content of the piece shal
21、l be determined in accordance with Clause 4. 6.2 Determination of thickness The thickness of the piece shall be measured at six places, one approximately in the middle of each long side and approximately 25 mm from the edges, and one at each corner approximately 25 mm in from the edge and 200 mm in
22、from the end (see Figure 1). The measuring instrument (5.1.1) shall be read to the nearest 0,1 mm, and the readings recorded. ISO 27567:2009(E) ISO 2009 All rights reserved 3Dimensions in millimetres Figure 1 Location of measuring points for thickness 6.3 Determination of length and width The length
23、 and width of the piece shall be measured to the nearest 1 mm, along both long sides and both ends, i.e. two measurements each for length and width. The measurements shall then be recorded. 6.4 Determination of spring Lay the piece to be checked on a flat surface. Take the measurement on the concave
24、 edge of the piece (see Figure 2). Attach the wire or cord (5.3.3) to one end of the piece with a thumbtack or staple (5.3.1). Place the blocks (5.3.2) on the edge to be measured and at each end of the piece. Pull the wire or cord around one corner, over both blocks and around the other corner. Atta
25、ch the loose end of the wire or cord to the other end of the piece with a thumbtack or staple, so that the wire or cord is held taut. Measure the perpendicular distance between the wire or cord and the midpoint of the piece at the centre of the edge, to the nearest 0,5 mm. Record the deviation from
26、straightness, i.e. the spring, as the difference between the measurement of the perpendicular distance between the wire or cord and the midpoint of the piece at the centre of the edge, and the average thickness of the blocks. Key 1 block thickness 2 width 3 perpendicular distance between wire and mi
27、dpoint of piece 4 wire or cord Figure 2 Measurement of spring (plan view) ISO 27567:2009(E) 4 ISO 2009 All rights reserved6.5 Measurement of bow Place the piece on the nominally flat, near horizontal surface (5.4.1) with convex face up, as shown in Figure 3. Place the load (5.4.3) of (85 5) kg on th
28、e centre of the piece. Measure the maximum distance, if any, between the nominally flat surface and the underside of the piece. Make allowance, if necessary, in the measurement for the out-of-flatness of the nominally flat surface. Record the measurement to the nearest 0,5 mm. Key 1 thickness 2 cent
29、re of piece 3 bow Figure 3 Measurement of bow 6.6 Measurement of twist Place the piece on the nominally flat, near horizontal surface (5.5.1), with three corners in contact with the surface, as shown in Figure 4. Measure the distance, if any, between the fourth corner of the piece and the nominally
30、flat surface. Make allowance, if necessary, in the measurement for the out-of-flatness of the nominally flat surface. Record the measurement to the nearest 0,5 mm. Key 1 twist Figure 4 Measurement of twist ISO 27567:2009(E) ISO 2009 All rights reserved 56.7 Measurement of squareness of section The s
31、quareness of section shall be measured at three positions along the edge to be checked; one approximately in the middle and the others 200 mm from each end of the piece. Place the square (5.6.1) on the edge to be checked, so that one leg of the square is butted firmly against the edge (see Figure 5)
32、. Measure the gap, if any, between the face at the opposite edge of the piece and the other leg of the square. Record the measurements to the nearest 0,1 mm. Dimensions in millimetres Key 1 centreline 2 gap Figure 5 Measurement of squareness of section 6.8 Measurement of cupping Cupping shall be mea
33、sured at three positions along the surface to be checked; one approximately in the middle and the others 200 mm from each end of the piece. Place a straight edge (5.7.2) across the surface to be checked, at right angles to the long edge of the piece so that it touches both edges of the piece (see Fi
34、gure 6). Measure the gap, if any, between the straight edge and the surface of the test piece on the centreline of the piece. Record the measurement to the nearest 0,1 mm. At the time of measurement the maximum moisture content gradient through the thickness of the test piece shall be 1 %. ISO 27567
35、:2009(E) 6 ISO 2009 All rights reservedKey 1, 2, 3 positions for measurement 4 gap 5 straight edge Figure 6 Measurement of cupping 7 Expression of results The results of each measurement shall be recorded as follows: thickness to the nearest 0,1 mm; length and width to the nearest 1 mm; spring to th
36、e nearest 0,5 mm; bow to the nearest 0,5 mm; twist to the nearest 0,5 mm; squareness to the nearest 0,1 mm; cupping to the nearest 0,1 mm. 8 Test report The test report shall include the following information: a) the maximum, minimum and mean of the results; b) the moisture content of the pieces at the time of measuring; c) a reference to this International Standard, i.e. ISO 27567; d) the date of the test; e) any deviation from this International Standard. ISO 27567:2009(E) ICS 79.060.99 Price based on 6 pages ISO 2009 All rights reserved
