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1、INTERNATIONAL STANDARD IS0 9073-8 First edition 1995-l 2-l 5 Textiles - Test methods for nonwovens - Part 8: Determination of liquid strike-through time (simulated urine) Textiles - M EDANA, 157 av. Eugene Plasky, B-1040 Brussels. -,-,- IS0 9073=8:1995(E) 0 IS0 5.2 Simulated urine, consisting of a 9
2、 g/l solution of sodium chloride in grade 3 water conforming to IS0 3696, with a surface tension of (70 + 2) mN/m. NOTES 3 Surface tension should be checked before each series of tests, as surface tension can alter during storage. 4 The surface tension of adult human urine is published as 69 mN/m to
3、 70 mN/m. There is a suggestion that some babies urine could have a lower surface tension (e.g. 45 mN/m). The surface tension of the simulated urine used may be adjusted by the addition of a surfactant. Such ad- dition should be reported as a deviation from standard pro- cedure and the surface tensi
4、on should be stated in the test report. 6 Apparatus 6.1 Burette, of 50 ml capacity, with a supporting stand. 6.2 Funnel, fitted with a magnetic valve, giving a rate of discharge of 25 ml in (3,5 $- 0,25) s. 6.3 Ring stand, to support the funnel. 6.4 Strike-through plate (see figures 1 and 2), constr
5、ucted of transparent acrylic sheet, of total mass 500 g, fitted with corrosion-resistant electrodes consisting of I,6 mm diameter platinum or stainless steel wire set in grooves of cross-section 4,0 mm x 7,0 mm cut in the base of the plate and fixed in place with quick-setting epoxy resin. The elect
6、rodes shall be positioned as shown in figure 2. 6.5 Baseplate, of transparent acrylic sheet, approxi- mately 125 mm x 125 mm square and 5 mm thick. 6.6 Electronic timer, which can be read to the nearest 0,Ol s. NOTE 5 The sensitivity of the timing mechanism is such that different apparatus could giv
7、e results slightly lower or higher than the specification for the standard absorbent pad alone. Users of the method are therefore advised to validate their equipment against results provided by the producer of the filter paper. 7 Sampling Carry out sampling in accordance with IS0 186, en- suring tha
8、t the areas from which the samples are taken have no visible flaws and are not creased. 8 Preparation and conditioning of test pieces 8.1 Cut 10 test pieces measuring 125 mm x 125 mm. 8.2 Condition the test pieces and filter papers in one of the atmospheres specified in IS0 139. 9 Procedure 9.1 Set
9、up the ring stand (6.3) holding the funnel (6.2) and position the burette (6.1) with the tip inside the funnel. 9.2 Place one nonwoven test piece on top of one set of five reference filter papers (5.1) on the baseplate (6.5). Place the nonwoven on the filter pa- per in such a way that the side of th
10、e nonwoven which is intended to be in contact with the users skin is uppermost. Ensure that the electrodes in the strike-through plate are clean. Place the strike-through plate (6.4) on top of the non- woven, with the centre of the plate over the centre of the test piece. Centre the burette and the
11、funnel over the plate. 9.3 Adjust the height of the funnel so that it is (5 + 0,s) mm above the top of the cavity in the plate (i.e. 30 mm above the test piece). 9.4 Ensure the electrodes are connected to the timer (6.6). Activate the timer and set the clock to zero. 9.5 Fill the burette with simula
12、ted urine (5.2). Keep the discharge valve of the funnel closed and run 5,0 ml of liquid from the burette into the funnel. IS0 9073-8: 1995(E) Dimensions in millimetres -T- B Optional weighting strips Strike-through plate r- (transparent acrylic sheet) i A-A -_- - -Electrodes I,6 mm (see subclause 6.
13、4) Figure 1 - Strike-through plate 3 IS0 9073-8: 1995(E) Figure 2 - Section across strike-through plate on centreline of 25 mm diameter cavity 9.6 Open the magnetic discharge valve of the fun- nel to discharge 5,0 ml of liquid. The initial flow of liquid will complete the electrical circuit and star
14、t the timer. It will stop when all the liquid has penetrated into the nonwoven and fallen below the level of the electrodes in the strike-through plate. 9.7 Record the time indicated on the electronic timer. 9.8 Repeat for the required number of test pieces. NOTE 6 A minimum of IO tests on test piec
15、es from each sample is recommended. 10 Expression of results For each sample, calculate the mean strike-through time, in seconds, and the coefficient of variation. 11 Test report The test report shall include the following information: a) a reference to this part of IS0 9073; b) all details necessar
16、y for complete identification of the nonwoven material; c) the conditioning atmosphere used; d) if required, surfactant added and surface tension of simulated urine; e) the individual strike-through times of the tests, in seconds; f) the mean strike-through time, in seconds; g) the coefficient of va
17、riation; h) any unusual features noted during the testing, or deviations from the procedure specified in this part of IS0 9073. -,-,- This page intentionally left blank -,-,- IS0 9073-8: 1995(E) ICS 59.080.30 Descriptors: textiles, fabrics, non-woven fabrics, tests, water absorption tests, determination, capacity. Price based on 4 pages -,-,-