BS-3544-1962.pdf
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1、BRITISH STANDARD BS 3544:1962 Incorporating Amendment Nos. 1 and 2 Methods of test for Polyvinyl acetate adhesives for wood Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3544:1962 This British Standard, having been approved by the Adhes
2、ives Industry Standards Committee and endorsed by the Chairman of the Chemical Divisional Council, was published under the authority of the General Council on 28 September 1962 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ADC/6 Draft for comment A
3、B(ADC) 1764 ISBN 0 580 35083 5 Co-operating organizations The Adhesives Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Adhesive Manufacturers
4、Association* Association of British Chemical Manufacturers Association of British Plywood and Veneer Manufacturers* Board of Trade British Carton Association British Furniture Manufacturers Federated Associations* British Gelatine a suitable device is described in Appendix B and illustrated in Figur
5、e 9. 15100 247 -9= Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3544:1962 2 BSI 07-1999 Appendix A Preparation of test pieces for tests for resistance to sustained load A.1 a) Selection of test slips. Prepare the test slips from Europe
6、an beech (Fagus sylvatica) 0.125 0.005 in (3.18 0.13 mm) thick. The growth rings may be at any angle, from 0 to 90 inclusive, relative to the face. Both faces of the slip should be planed. The slips shall be flat and free from splits, knots, whorls and dote; the angle of inclination of the grain acr
7、oss the face of each test slip shall be not greater than 1 in 9, and the grain shall not be obviously inclined to the face. i) Inclination of grain ACROSS the face. The appearance of the “flower” (growth ring figure) on the face of a slip gives little indication of the straightness of grain (see Fig
8、ure 3). The small rays, which are darker in colour than the surrounding wood, afford an easy means of determining grain direction. Figure 3 shows straight-grained slips and Figure 4 illustrates the maximum permissible grain inclination of 1 in 9 across the face. ii) Inclination of grain TO the face.
9、 The inclination of the grain to the face of the slip is viewed on the edges (see Figure 5) and the long lines formed by the junctions of the growth rings afford the best guide. The areas of darker ray tissue shown diagrammatically in Figure 5 should be disregarded. Immediately before the preparatio
10、n of the test piece, lightly sand each slip. NOTEA suitable procedure is to give the appropriate part four double strokes parallel to the direction of the grain with a flat block to which a sheet of suitable abrasive material1) has been firmly attached. Take care to hold the block flat on the slip s
11、o that the surface is uniformly sanded and rounding of the sides of the slip is avoided. b) Moisture content. The moisture content of the slips at the time of gluing shall be 12 2.5 per cent. NOTEThe specified moisture content of 12 2.5 per cent corresponds with the conditions attained by wood durin
12、g storage in a normally heated room in the British Isles. To determine the moisture content, accurately weigh representative samples of the wood and dry them in an oven maintained at a temperature of 105 3 C until their weight is constant. Take care to prevent change in moisture content between the
13、cutting of the sample and the first weighing, or between removal from the oven and the subsequent weighing. where W = weight, in grammes, of sample before treatment and W1 = weight, in grammes, of dried sample. c) Construction of test pieces. i) Test slips. Prepare each test piece from three slips o
14、f beech selected as described above, 4.5 0.01 in (114 0.25 mm) long and 1 0.01 in (25 0.3 mm) wide, joined together with the adhesive under test so as to produce a 0.5 0.01 in (12.5 0.3 mm) overlap joint (see Figure 6). ii) Preparation of the adhesive. Prepare and use the adhesive in accordance with
15、 the instructions provided by the manufacturer. iii) Preparation of the test pieces. Prepare the test pieces under ordinary room conditions, except where otherwise directed by the manufacturer. Apply the adhesive uniformly to one of the two faces forming a joint or as prescribed by the manufacturer.
16、 Place the slips forming a joint in contact without rubbing, immediately the adhesive is applied, or after such period as may be prescribed by the manufacturer. When the test pieces have been prepared, place them immediately in a suitable clamp, a convenient form of which is shown in Figure 7. Apply
17、 sufficient pressure to ensure good contact: normally a load of approximately 50 lb (23 kg), equivalent to a pressure of 100 lbf/in2, is adequate. A convenient jig for locating the clamp and its contents is shown in Figure 8. Allow the test pieces to remain in their clamps, in ordinary room conditio
18、ns, for not less than 8 hours, or as instructed by the manufacturer. 1) Glass paper complying with Grade No. 1 of BS 871, “Abrasive papers and cloths for general purposes”, is recommended. Water, per cent by weight 100 WW1() W1 -= Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:11:12 GMT+0
19、0:00 2006, Uncontrolled Copy, (c) BSI BS 3544:1962 BSI 07-19993 A.2 Conditioning of the test pieces. Release the test pieces from their clamps and place them in a conditioning atmosphere2) of 25 1 C (77 2 F) and 65 2 per cent relative humidity for not less than 7 nor more than 14 days. Leave the tes
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