SANS 5973-2009 Average adhesive bond quality of plywood and composite boards (knife test)《胶合板及复合板的平均粘结质量(刀齿试验)》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22038-9 SANS 5973:2009 Edition 1.1 Any reference to SABS Method 973 is deemed to be a reference to this standard (Government Notice No. 13

4、73 of 8 November 2002)SOUTH AFRICAN NATIONAL STANDARD Average adhesive bond quality of plywood and composite boards (knife test) Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standar

5、d may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 Table of changes Change No. Date Scope Amdt 1 2009 Amended to change the designation of SABS standards to SANS standards. Foreword This South African standard was approved by Nation

6、al Committee SABS SC 1008B, Wood and associated products Reconstituted timber, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in February 2009. This document supersedes SABS SM 973:1986 (first (first edit

7、ion). This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 1 Contents Page Foreword 1 Scope 3 2 Principle 3 3 Apparatus 3 4 Preparation of test specimens 3 5 Procedure 4 6 Calculations. 5 7 Report. 5 This standard may only

8、 be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 2 This page is internationally left blank This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 3 Average adhesive

9、 bond quality of plywood and composite boards (knife test) 1 Scope This method covers the knife test for determining bond quality between the plies of plywood, and veneered composite board products. NOTE 1 In this method reference is made to the latest issues of SANS 10183 (SABS 0183) Terminology an

10、d classification of adhesives for wood, and SANS 6016 and SANS 6032 (SABS SM 1016 and SABS SM 1032). NOTE 2 This method is an alternative to the internal bond test as given In SANS 6016. The assessment of the quality of bonding is based on the traditional belief that a well-made joint should break u

11、nder test in the wood rather than in the glue line. The highest bond quality is reflected when the separation occurs only in the wood, and the glue line is covered entirely by adhering fibre. When total delamination occurs, there is no bonding between the veneers. Between these extremes is an Infini

12、te number of gradations ranging from extensive wood breakage with occasional areas of glue line to a separation in which the glue line shows only isolated patches of fibre. 2 Principle Test specimens can be so selected from a large number of sample boards that, when arranged in order from low to hig

13、h bond quality, they present a visual linear scale similar to that shown in plates 1 to 6 and numbered in steps from 0 (the lowest bond quality) to 10 (the highest bond quality). 3 Apparatus 3.1 Knife (see Figure. 1). 3.2 Firm workbench A workbench of convenient height with a stopping block on the s

14、urface, against which the test specimen is laid. 4 Preparation of test specimens 4.1 From each sample board cut four test specimens of size approximately 150 mm 150 mm. 4.2 Condition each test specimen (of the exposure class given in column 1 of table 1) in accordance with the applicable treatment n

15、umber given in SANS 10183. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 4 Table 1 Conditioning required before knife testing specimens of a particular exposure class 1 2 Exposure class Treatment No. (see SANS 6032)

16、 1. Exterior 4 2. Semi-exterior 3 3. Wet interior 1 4. Dry interior 1 4.3 Immerse the test specimens from treatments 3 and 4 (see column 2 of table 1) in tap water for ease of handling before testing. 4.4 Test all specimens as soon as possible after conditioning, and keep submerged in tap water unti

17、l testing Is undertaken, 5 Procedure 5.1 Aggregates Place the test specimen flat on the workbench and secure the specimen while the test is being carried out. Apply the knife (see figure 2) cutting edge parallel to the grain of the face veneer under test. Push the knife edge down into the face venee

18、r until the tip reaches the glue line. Then push It horizontally along the glue line for a distance of approximately 25 mm to 50 mm, and finally prize off the veneer by pressing downward on the knife handle. Working across the test specimen and commencing each time on an undamaged area of the surfac

19、e, repeat this operation until the veneer has been fully removed. NOTE In order to achieve systematic and speedy removal of the tested veneer over the entire sample area, the following procedure is recommended (see Figure. 2): a) Start the first cut near the left edge of the test specimen about 20 m

20、m from the edge facing you. b) If some veneer still remains to the left of the first cut, perform the next cuts on that side until the veneer has been fully removed to the left edge. c) Perform the following cuts to the right of the first cut in 25 mm to 50 mm strips, until all the veneer has been r

21、emoved over the entire sample width from left to right (or vice versa, if that is preferred). d) Repeat the procedure, always starting at the undamaged edge of the remaining veneer. In this way, the veneer is removed strip by strip until the sample edge resting against the backstop is reached. e) Tu

22、rn the test specimen through 180, so that the untested edge is now against the backstop. Remove the remaining veneer. f) It happens frequently that it is very difficult to achieve the veneer separation at the tested glue line, and that the next veneer layer readily peels off. In such a case, another

23、 starting point must be tried, or the sample must be rotated through 180, and the procedure then started from the other end. The use of shorter cuts with the blade may also improve veneer separation. This standard may only be used and printed by approved subscription and freemailing clients of the S

24、ABS.SANS 5973:2009 Edition 1.1 5 g) It may also happen that the veneer removed in a cut may be substantially wider then the knife width. In extreme cases, the entire width of unbroken veneer is removed by a few successive cuts. These larger pieces must be retained and used In assessing the bond qual

25、ity of the particular glue line, by evaluating both separated surfaces and allocating a single bond quality value for that glue line, 5.2 Examine the tested glue line of the test specimen and by comparison with the visual linear scale given in plates 1 to 6, award the test specimen a rating for bond

26、 quality. NOTE The master scale itself has steps of 2, but interpolations to the nearest whole number can be made. Take as the bond quality of the glue line the average of the results from each of the four test specimens, rounded off to the nearest whole number. In the case where a large piece of ve

27、neer was peeled off, use both surfaces to determine a single bond quality value, 5.3 After assessing the bond quality of the first glue line, turn the test specimen over and, using the same procedure, remove the back veneer and record the bond quality. 5.4 Repeat for all glue lines by continually tu

28、rning the test sample over, cutting, and recording the bond quality per glue line. NOTE It is important that the individual bond ratings are recorded in such a manner that the ratings of a particular glue line from all the tested specimens can be easily grouped and averaged (see table 2), 6 Calculat

29、ions 6.1 Calculate the average bond quality of the board by taking the arithmetic mean of the average bond quality of the glue lines for each test specimen (see 4.2), rounded off to the nearest whole number, NOTE For example, if the results from four test specimens were 6, 8, 10 and 5, the average b

30、ond quality of the board would be 7, 25 which is recorded an 7. 7 Report 7.1 Include the following minimum information in the test report: a) The name of the test laboratory, when relevant, and the date of the test, b) Reference to this standard method, c) Identification of the test specimens, d) th

31、e tabulated bond quality values (a typical format is shown in table 2), e) discussion, when relevant; and f) conclusion, when relevant 7.2 Results may be tabulated as follows: This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Editi

32、on 1.1 6 Table 2 Bond quality results 1 2 3 4 5 6 7 Bond quality per sample number Glue line number 1 2 3 4 Totals Average per glue line 1 2 - 6 Grand total - - Average board bond quality - NOTE This table depicts results on a 7-ply plywood with 6 glue lines. Figure 1 Knife for bond quality test of

33、plywood and composite board This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 7 Figure 2 Recommended procedure for doing knife test This standard may only be used and printed by approved subscription and freemailing cli

34、ents of the SABS.SANS 5973:2009 Edition 1.1 8 Plate 1. Bond quality No. 0 in the visual linear scale for assessing bond quality in plywood by knife test This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 9 Plate 2. Bond

35、quality No. 2 in the visual linear scale for assessing bond quality in plywood by knife test This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 10 Plate 3. Bond quality No. 4 in the visual linear scale for assessing bond

36、 quality in plywood by knife test This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 11 Plate 4. Bond quality No. 6 in the visual linear scale for assessing bond quality in plywood by knife test This standard may only be

37、 used and printed by approved subscription and freemailing clients of the SABS.SANS 5973:2009 Edition 1.1 12 Plate 5. Bond quality No. 8 in the visual linear scale for assessing bond quality in plywood by knife test This standard may only be used and printed by approved subscription and freemailing

38、clients of the SABS.SANS 5973:2009 Edition 1.1 13 Plate 6. Bond quality No. 10 in the visual linear scale for assessing bond quality in plywood by knife test SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS. This page has been left blank in

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