BS 1088-2-2003 Marine plywood Determination of bonding quality using the knife test《船用胶合板 用刀齿试验测定粘结质量》.pdf

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1、BRITISH STANDARD BS 1088-2:2003 Marine plywood Part 2: Determination of bonding quality using the knife test ICS 79.060.10 BS 1088-2:2003 This British Standard was published under the authority of Standards Policy and Strategy Committee on 9 June 2003 BSI 9 July 2003 First published as BS 1088 Part

2、2: Determination of bonding quality using the knife test. This method of determining bonding quality was used to demonstrate conformity to the bonding quality requirements of BS 1088:1966. It has been shown over many years to produce reasonably consistent results; it is quick and simple to perform a

3、nd requires no expensive apparatus. Its main limitations are that some physical strength is required and that operators need training and experience before they are able to make consistent visual assessments. Since verification of conformity to BS 1088-1 may be made by any competent testing body whi

4、ch applies the tests specified in the standard, it was decided to make the shear test of BS EN 314-2 the method of verification of bonding quality. The knife test is, however, still widely used by manufacturers and has, therefore, been retained as a quality control test. BS 1088-1 specifies that whe

5、re this test is used for that purpose, the manufacturer is required to prove that the bonding quality value required by internal controls ensures that the material will pass the shear test. It has been assumed in the drafting of this standard that execution of its provisions will be entrusted to sui

6、tably qualified and experienced people, for whose use it has been prepared. WARNING This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user fro

7、m legal obligations relating to health and safety at any stage. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Su

8、mmary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 1088-2:2003 BSI 9 July 2003 1 1 Scope This standard describes a method of as

9、sessing the bonding quality of marine plywood using two groups of test specimens, one of which has been immersed in cold water and the other of which has been immersed in boiling water or subjected to steam. It is intended for use as a manufacturing quality control test and not for demonstrating ver

10、ification of conformity to a plywood specification. 2 Normative references The following referenced document is indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a

11、ny amendments) applies. BS 1088-1, Marine plywood Part 1: Requirements. 3 Principle Test pieces are cut from the marine plywood to be assessed and subjected to immersion in cold water. In addition, a separate set of test pieces is either immersed in boiling water or subjected to steam. Following thi

12、s treatment the plies of the test pieces are forcibly separated using a cranked chisel. The amount of adherent wood fibre is then assessed visually, compared to a master scale comprising a series of standard photographs and allocated a bonding quality number between 1 and 10. 4 Apparatus 4.1 Cranked

13、 chisel. NOTE 1 The cranked chisel may be made from a 200 mm 25 mm flat file. An example is shown in Figure 1. NOTE 2 The cranked chisel should be kept sharp. Figure 1 Cranked chisel for the knife testing of marine plywoodBS 1088-2:2003 2 BSI 9 July 2003 4.2 Bench, between 0.8 m and 1.0 m in height

14、and 0.5 m wide. The bench shall be firm, strong and fitted with a strong backstop to prevent the test pieces from sliding. NOTE The face of the backstop can become damaged in use and should be easily renewable or replaceable. 4.3 Rack, capable of holding test pieces with their faces vertical and sep

15、arated from each other by not less than 10 mm. 4.4 Thermostatic water bath, capable of maintaining a temperature of (15 5) C and with a means of maintaining a constant water level to ensure that the test pieces are immersed to the correct depth throughout the specified immersion period. 4.5 Boiling

16、tank, capable of enabling the test pieces to be immersed in boiling water. NOTE Loss by evaporation can be reduced if the tank has a tight-fitting lid and a condenser allowing the water vapour to reflux. 4.6 Autoclave 1) , heated by live steam and capable of maintaining an internal pressure of eithe

17、r 100 kPa or 200 kPa throughout the specified steaming period. WARNING Autoclaves are pressurized vessels heated by live steam and care needs to be taken in their use. Attention is drawn to The Pressure Systems Safety Regulations 2000, the Pressure Equipment Regulations 1999 and Guidance Note PM73 f

18、rom the Health and Safety Executive, Safety at Autoclaves. 5 Selection and preparation of test pieces Test pieces shall be either (150 5) mm (150 5) mm or (200 5) mm (100 5) mm. Their thickness shall be equal to the panel thickness, and they shall be square edged and cleanly sawn. 200 mm 100 mm test

19、 pieces shall be cut so that the grain direction of the face plies is along the 200 mm axis. 6 Procedure 6.1 Cold water immersion Fill the water bath (4.4) and set the temperature to maintain (15 5) C. Place the test pieces in the rack (4.3) and place the rack in the water bath. Ensure that there is

20、 at least 10 mm clearance between the edges of the test pieces and the inside of the water bath and that the test pieces are covered by not less than 50 mm depth of water throughout the period of the test. Remove the test pieces from the water after a period of (20 4) h and apply the knife test in a

21、ccordance with 6.3. 6.2 Boiling water or steam treatment 6.2.1 Boiling water treatment Heat the water in the boiling tank (4.5) to atmospheric boiling point. Place the test pieces in the rack and immerse the rack in the boiling water. Ensure that there is at least 10 mm clearance between the edges o

22、f the test pieces and the inside of the water bath and that the test pieces are covered by not less than 50 mm depth of water throughout the period of the test. Ensure that the water continues to boil throughout the test period. Remove the test pieces from the boiling tank after (72 1) h and cool th

23、em immediately to (20 3) C by quenching in cold running water. Ensure that the test pieces remain in cold running water until the knife test is applied in accordance with 6.3. 1) Required only for testing in accordance with 6.2.2.BS 1088-2:2003 BSI 9 July 2003 3 6.2.2 Steam treatment NOTE This treat

24、ment may be used as an alternative to the (72 1) h boiling treatment described in 6.2.1. Place the test pieces in the rack as described in 6.1 and transfer them to the autoclave (4.6). Apply one of the following sets of conditions. a) Raise the steam pressure in the autoclave to 100 kPa and maintain

25、 this pressure for (24 1) h. b) Raise the steam pressure in the autoclave to 200 kPa and maintain this pressure for (12 0.5) h. At the end of this time, reduce the pressure in the autoclave to atmospheric pressure, remove test pieces from the rack and cool them immediately to (20 3) C by quenching i

26、n cold running water. Ensure that the test pieces remain in cold running water until the knife test is applied in accordance with 6.3. 6.3 Knife test Remove excess water from the surface of the test pieces by shaking them or wiping them with a cloth. Place each test piece flat on the bench with one

27、edge against the backstop so that the grain of the face ply is parallel to it. Apply the knife to the face ply and push firmly until it reaches the underlying glue line. Push the knife horizontally so that the veneer is prised upward. When 3050 mm of veneer has been prised off it should be torn off

28、by hand and discarded. Repeat this step until the whole veneer has been stripped off. Do not reapply the knife to cleaved areas or to glue lines already exposed. NOTE 1 The knife can be more readily inserted and moved forward if the handle is oscillated from side to side. Compare the appearance of t

29、he cleaved glue line with the master scale given in Annex A. Assess the bonding quality on a scale of 0 to 10 and note the result. NOTE 2 If the appearance is judged to fall between two examples, an intermediate value, e.g. 5.5, may be assigned. Turn the test pieces through 90 and repeat the above s

30、teps to assess the bonding quality of the next glue line. Repeat for all remaining glue lines. Always apply the knife in a direction 90 to the grain direction of the exposed veneer. 7 Calculation of bonding quality of test pieces The bonding quality of each test piece shall be the arithmetic mean of

31、 the bonding qualities of each of its glue lines and shall be expressed to the nearest whole number. 8 Test report The report shall contain the following information: a) the production date, time or batch number of the material tested; b) the date of the test; c) details of the pretreatments used as

32、 given in Clause 6; d) the number of specimens tested and the bonding quality, calculated in accordance with Clause 7.BS 1088-2:2003 4 BSI 9 July 2003 Annex A (normative) Master scale for assessing bonding quality in marine plywood by the knife test Figure A.1 to Figure A.6 provide a master scale ag

33、ainst which to compare the appearance of cleaved glue lines. Figure A.1 Bonding quality number 0 BS 1088-2:2003 BSI 9 July 2003 5 Figure A.2 Bonding quality number 2BS 1088-2:2003 6 BSI 9 July 2003 Figure A.3 Bonding quality number 4BS 1088-2:2003 BSI 9 July 2003 7 Figure A.4 Bonding quality number

34、6BS 1088-2:2003 8 BSI 9 July 2003 Figure A.5 Bonding quality number 8BS 1088-2:2003 BSI 9 July 2003 9 Figure A.6 Bonding quality number 1010 blankBS 1088-2:2003 BSI 9 July 2003 11 Bibliography BS EN 314-2, Plywood Bonding quality Part 2: Requirements. UNITED KINGDOM. The Pressure Systems Safety Regu

35、lations 2000. London: The Stationery Office. UNITED KINGDOM. The Pressure Equipment Regulations 1999. London: The Stationery Office. UNITED KINGDOM. The Health and Safety Executive. Safety at Autoclaves. Guidance Note PM73. London: HSE Books, 1998.BS 1088-2:2003 BSI 389 Chiswick High Road London W4

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