1、 Reference number ISO 12466-1:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 12466-1 Second edition 2007-11-15 Plywood Bonding quality Part 1: Test methods Contreplaqu Qualit du collage Partie 1: Mthodes dessai ISO 12466-1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordanc
2、e with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licens
3、ing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing.
4、 Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise spe
5、cified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office
6、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 2007 All rights reservedISO 12466-1:2007(E) ISO 2007 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Test
7、pieces 1 3.1 Sampling 1 3.2 Shape and size 1 4 Apparatus 5 4.1 Pre-treatment. 5 4.2 Shear test. 5 5 Pre-treatment. 5 5.1 Sequence of pre-treatment 5 5.2 Positioning of test pieces 5 6 Procedure 6 6.1 Determination of behaviour of ply bonding by shear test 6 6.2 Determination of percentage of apparen
8、t cohesive wood failure . 6 6.3 Alternative procedure. 6 7 Expression of results . 6 8 Test report . 7 Annex A (normative) Determination of percentage of apparent cohesive wood failure by comparison with reference illustrations. 8 Annex B (normative) Bond testing and evaluation using the chisel/knif
9、e testing procedures (suitable for quality control purposes only) 12 Bibliography . 16 ISO 12466-1:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparin
10、g International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liai
11、son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of t
12、echnical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is d
13、rawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12466-1 was prepared by Technical Committee ISO/TC 89, Wood-based panels, Subcommittee SC 3, Plywood. This seco
14、nd edition cancels and replaces the first edition (ISO 12466-1:1999), which has been technically revised. ISO 12466 consists of the following parts, under the general title Plywood Bonding quality: Part 1: Test methods Part 2: Requirements INTERNATIONAL STANDARD ISO 12466-1:2007(E) ISO 2007 All righ
15、ts reserved 1 Plywood Bonding quality Part 1: Test methods 1 Scope This part of ISO 12466 specifies methods for determining the bonding quality of plywood, blockboard, battenboard, and laminboard, bonded with thermosetting resin, by shear testing. NOTE If it is possible to demonstrate a correlation
16、between the methods defined in this part of ISO 12466 and other methods, these may be used. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editi
17、on of the referenced document (including any amendments) applies. ISO 12466-2, Plywood Bonding quality Part 2: Requirements ISO 16999, Wood-based panels Sampling and cutting of test pieces 3 Test pieces 3.1 Sampling Sampling shall be in accordance with ISO 16999. Test pieces shall be without any vis
18、ible defect in the testing area. 3.2 Shape and size The test pieces shall be prepared as shown in Figures 1, 2 and 3. Each test piece shall be cut so that the grain direction of the layer (ply) between the glue lines under test is perpendicular to the length of the test piece. The test pieces shall
19、be prepared and nicking (saw cuts) made to allow the examination of each glue line of the panel. The saw cuts shall extend inside the layer. Test pieces of full-panel thickness may be used for panels with three to nine layers (plies). For panels of more than nine layers, excess layers shall be remov
20、ed by planing, cutting or sanding. ISO 12466-1:2007(E) 2 ISO 2007 All rights reservedKey b 1= (25 0,5) mm shear width (width of test piece) b 2= 2,5 mm to 4 mm saw cut width l 1= (25 0,5) mm shear length l 2= 50 mm minimum distance between clamps thickness = panel thickness aAlong the grain directio
21、n. Figure 1 Test piece example for a 7-ply veneer plywood ISO 12466-1:2007(E) ISO 2007 All rights reserved 3a) part 1 b) part 2 c) bonding of the faces of the two parts and grooving Key 1 face 2 back face 3 saw cuts throughout the face layers 4 faces of part 1 and part 2 b5 glue-line not subject to
22、the shear test b 1= (25 0,5) mm shear width b 2= 2,5 mm to 4 mm saw cut width l 1= (25 0,5) mm shear length l 2= 50 mm minimum distance between clamps aAlong the grain direction. bThe same set-up shall be made for the back face of part 1 and part 2. Figure 2 Composite test piece for blockboard and l
23、aminboard ISO 12466-1:2007(E) 4 ISO 2007 All rights reserveda) part 1 b) part 2 c) bonding of the faces of the two parts and grooving Key 1 face 2 back face 3 saw cuts throughout the face layers 4 faces of part 1 and part 2 b5 glue-line not subject to the shear test b 1= (25 0,5) mm shear width b 2=
24、 2,5 mm to 4 mm saw cut width l 1= (25 0,5) mm shear length l 2= 50 mm minimum distance between clamps aAlong the grain direction. bThe same set-up shall be made for the back face of part 1 and part 2. Figure 3 Composite test piece for thin-face plywood panel ISO 12466-1:2007(E) ISO 2007 All rights
25、reserved 5 4 Apparatus 4.1 Pre-treatment 4.1.1 Temperature-controlled water bath suitable for immersing test pieces and capable of maintaining a minimum temperature of 17 C. 4.1.2 Boiling tank enabling test pieces to be immersed in boiling water. 4.1.3 Ventilated drying oven capable of maintaining a
26、 temperature of (60 3) C at all points. 4.1.4 Vacuum pressure chamber capable of maintaining in water at room temperature a vacuum of 85 kPa for 30 min followed immediately by application of pressure of 450 kPa to 480 kPa for 30 min. 4.1.5 Autoclave capable of maintaining steam pressure at (200 7) k
27、Pa for 6 h 15 min. 4.2 Shear test Tensile testing machine fitted with serrated wedge action grips, capable of operating continuously and measuring the load to an accuracy: 1 %. 5 Pre-treatment 5.1 Sequence of pre-treatment The choice of pre-treatment, described in 5.1.1 to 5.1.6, for particular plyw
28、ood classes, shall be made in accordance with ISO 12466-2. 5.1.1 24 h Cold soak: immersion for 24 h in water at a temperature not lower than 17 C. NOTE (20 3) C can be considered as a test reference temperature. 5.1.2 6 h Boil: immersion for 6 h in boiling water, followed by cooling in water at less
29、 than 30 C for at least 1 h. 5.1.3 BDB: immersion for 4 h in boiling water, then drying in the ventilated drying oven for 16 h to 20 h at (60 3) C, then immersion in boiling water for 4 h, followed by cooling in water at less than 30 C for at least 1 h. 5.1.4 VP: test specimens are immersed in water
30、 at room temperature and a vacuum of 85 kPa is applied for 30 min followed by the immediate application of a pressure of 450 kPa to 480 kPa for 30min. 5.1.5 72 h Boil: immersion for (72 1) h in boiling water, followed by cooling in water at less than 30 C for at least 1 h. 5.1.6 Steam: specimens are
31、 placed in steam at (200 7) kPa pressure for 6 h 15 min followed by cooling for at least 1 h in water at less than 30 C. 5.2 Positioning of test pieces The test pieces shall be placed, well separated and free to move, in a wire basket. During soaking, each test piece shall remain completely immersed
32、 in water. ISO 12466-1:2007(E) 6 ISO 2007 All rights reserved6 Procedure 6.1 Determination of behaviour of ply bonding by shear test Before the water treatment, measure the length and width of the shear area to an accuracy of 0,1 mm and record. Arrange the shear test pieces in the centre of the clam
33、ping device in such a way that the load can be transmitted from the testing machine, via the ends of the test pieces, to the shear area without any transverse load. If slipping occurs, it shall only be allowed in the initial stage of the loading. Apply the load at a constant speed so that failure oc
34、curs within (30 10) s. Determine and record the load at failure, to an accuracy of 1 %. Calculate the shear strength, in megapascals, in accordance with Clause 7. After the shear test, determine the apparent cohesive wood failure in accordance with 6.2. 6.2 Determination of percentage of apparent co
35、hesive wood failure Allow the test pieces to dry before determination of apparent cohesive wood failure. The percentage of apparent cohesive wood failure shall be determined by comparison with the standard illustrations in Annex A, by 10 % increments from 0 % to 100 %, and recorded. Failure should n
36、ormally occur in the wood or in the glue lines between the saw cuts, i.e. within the shear test area. If failure occurs outside the test area, or by cross-grain breaking within 50 % or more of the surface of a face veneer, reject the result and repeat the test with a shear length of 10 mm. Failures
37、resulting from the presence of strength-reducing defects shall also be excluded, with the exception of test pieces containing tape. Test pieces with such defects should normally be identified and replaced during the cutting operation. If the number of test pieces rejected exceeds 20 %, it is necessa
38、ry to resample. If the re-sampling is also rejected on this basis, then the batch shall be rejected. 6.3 Alternative procedure An alternative procedure for bond testing and evaluation, the knife or chisel test, is provided in Annex B. This procedure is deemed suitable for quality control purposes on
39、ly. 7 Expression of results Calculate the shear strength, , in megapascals, of each test piece, from Equation (1): F lb = (1) where F is the force (load), in newtons, at failure of the test piece; l is the length, in millimetres, of the shear area; b is the width, in millimetres, of the shear area.
40、Calculate the mean shear strength, to the nearest 0,01 MPa, and the standard deviation. Also, determine the average percentage cohesive wood failure, to an accuracy of 10 %. ISO 12466-1:2007(E) ISO 2007 All rights reserved 7 8 Test report The test report shall be in accordance with ISO 16999, and sh
41、all also contain the following information: a) mean shear strength, in megapascals, and the standard deviation; b) average percentage apparent cohesive wood failure; c) details of pre-treatment (see 5.1); d) a reference to this part of ISO 12466. ISO 12466-1:2007(E) 8 ISO 2007 All rights reservedAnn
42、ex A (normative) Determination of percentage of apparent cohesive wood failure by comparison with reference illustrations Determine the percentage of apparent cohesive wood failure of the dried individual specimen to the nearest 10 % by comparison to the reference illustrations (see Figures A.1, A.2
43、, and A3). The determination consists of an area assessment and a determination of the texture of the failure surface. For photo technical reasons, the illustrations are intended for use only with plywood bonded with a brown glue. In the determination of failure texture of both deep and superficial
44、failures in the veneers, the same weighting shall be assigned as to apparent cohesive wood failures. The texture of the broken surfaces shall be determined using the following guidelines: a) sufficient light should be available to appreciate the correct texture of the failure surfaces a magnifying l
45、ens may also be of assistance; b) areas of the broken surfaces lying entirely in the veneer adjacent to the tested glue lines or areas of the tested glue lines covered with opaque bundles of fibres should count as apparent cohesive wood failure; c) a failure surface having a shaggy/downy appearance
46、due to covering of the glue lines with fine fibres should count as apparent cohesive wood failure; d) a thin transparent layer of fibres on the glue line should also be counted as apparent cohesive wood failure, as long as the general appearance shows covering with fibres; e) glue visible through a
47、covering of fine fibres should not be recorded as apparent cohesive wood failure; f) areas of the glue line, where no glue has been present at the time of bonding, should not be counted as apparent cohesive wood failure. The determination of percentage of wood-fibre failure is subjective and is a sk
48、ill not instantly acquired. While trained and experienced operators obtain accurate and reproducible results, differences between operators and laboratories may occur. To minimise this possibility, the above guidelines shall be observed. NOTE Dispersion in interpretation of visual examination result
49、s can exceed 10 % in usual practice. ISO 12466-1:2007(E) ISO 2007 All rights reserved 9Figure A.1 Reference illustrations Wood fibre failure 0 % to 30 % ISO 12466-1:2007(E) 10 ISO 2007 All rights reservedFigure A.2 Reference illustrations Wood fibre failure 40 % to 60 % ISO 12466-1:2007(E) ISO 2007 All rights reserved 11Figure A.3 Reference illustrations Wood fibre failure 70 % to 100 % ISO 12466-1:2007(E) 12 ISO 2007 All rights reserv
