ISO 9073-11 pdf download – Textiles 一Test methods for nonwovens 一 Part 11: Run-off

ISO 9073-11 pdf download – Textiles 一Test methods for nonwovens 一 Part 11: Run-off.
3.1
run-off
quantity of excess liquid, in grams, that runs from the test piece
3.2
percent run-off
mass of the run-off liquid, expressed as a percentage of the iriginaI ms of liquid delivered
4 Test I — Basic method for testing hydrophilic nonwovens
4.1 Principle
A specified quantity of simulated unne is discharged at a prescribed rate unbar specified conaiuons on to a test piece of nonwoven that Is supenmposed on a standard absorbent media and placed on an inclined table. Any excess liquid that runs down the test piece Is collected by a standard receiver pad placed below the lower end of the nonwoven test piece.
The run-off measures the mass of liquid collected by the standard receiver pad.
4.2 Apparatus
4.2.1 Run-off table, of acrylic glass or similar material as shown in Figure 1. the plane of which can be adjusted to the required angle.
The table is inclined at 25 and marked with two reference black lines at 250,0 mm ± 0.2 mm distance (see FIgure 2).
The lower line (3,0 mm ± 0.2 mm from the lower end of the table) defines the position of the lower end of the absorbent medium; the upper line (approximately 25 mm from the upper end of the test piece) defines the position of the discharge tube axis.
4.2.2 Clip, or similar with symmetrical reference marks at 140,0 mm ± 0,2 mm (to adjust the axial position of the test pieces).
4.2.3 Spirit level, to ensure axial discharge of the tube.
4.2.4 Support, for placing the standard receiver pad below the lower end of the test piece.
4.2.5 Standard absorbent medIum, having the characteristics given below and consisting of two layers of reference fitter paper each (140 ± 1) mm (275± 1) mm with the longer side in the machined direction (MD)
5.4.2 The test pieces shall be conditioned as specified in ISO 139.
5.5 Procedure
5.5.1 Adjust the angle of the table inclination to (25° ± 10’).
5.5.2 Use the spirit level (4.2.3) to ensure the top edge of the table is horizontal.
5.5.3 Set the dosing equipment for a discharge of (25,0 ± 0,5)9 in (4.0 ± 0,1) s.
Verify regularty that the specified mass of liquid is being delivered by performing the following test
Hold a dean dry pre-weighed cylinder capable of containing (25.0 ± 0.5) g of liquid under the glass tube (42.8). Activate the timer (4.2.11), collect and weigh the test liquid dispensed. If the mass dispensed is outside the lwnit (25,0 t 0.5) g. adjust the flow by modifying the speed of the motor using the pump control box (see 4.2.10) and repeat the test. Continue testing and adjusting uintil at least three successive collections are within the specified limits.
5.5.4 PositIon the ring stand (42.9) and the glass tube vertically with the outlet about 27 mm above the table, at the centre of the upper relerence line.
5.5.5 Prepare the 3 sets of standard absorbent medium (4.2.5) on a desk besides the table (4.2.1).
5.5.6 Place the standard absorbent medium on the table with the filter papers’ test sides up, just covering the lower reference line,
5.5.7 Pick up the test piece from the corners in order to avoid the contamination of the test area.
5.5.8 Place the nonwoven test piece, test side up. on the absorbent media so that the nonwoven is (5 ± 1) mm longer than the filter paper in the lower end.
5.5.9 Fix the absorbent medium and nonwoven with the clip (4.2.2) centered between axial position marks (see
4.2.1).
5.5.10 Adjust the vertical distance between the glass tube (4.2.8) and the test piece to (25 1) mm,
5.5.11 Weigh the standard receiver pad (4.2.6) to an accuracy of 0.01 g and record the mass
5.5.12 Place the receiver pact on its support (4.2.4).
5.5.13 Start the discharge of test liquid (4.2.7).
5.5.14 Wait for 5s after the discharge is completed.
5.5.15 WeIgh the standard receiver pad with the collected run-off liquid and record the mass (m2) to an accuracy of 0.019.
5.5.16 Wait for 4 mm to have elapsed between step 5.5.13 and step 5.5.17.
5.5.17 Remove the nonwoven test piece and place it on a fresh absorbent medium afready prepared.
5.5.18 Remove the wet standard absorbent medium.
5.5.19 Make sure the run-off table is completely dry before each test.