1. Introduction

The permeability tester is used to measure the permeability of sanitary towels, sanitary pads, diapers/tablets and other sanitary products. It is used in sanitary products factories, national quality inspection centers and so on

2. Test principle:

Take to be a test samples, it is natural state down on a large enough known quality filter paper and on diapers permeability tester is down to the bottom of the funnel, the funnel, quickly open the valve with a certain liquid liquid flow freely to the surface of a sample, will absorb liquid sample after removing, weighing in a sample of known quality filter paper, expressed as a poor quality of the osmotic quantity.

G = G1 and G2................................................... (l), where:

G-- infiltration rate, G;

G1-- the mass after paper absorption, g;

G2-- mass before suction of filter paper, g.

Scope of application

This instrument is used to test the permeability of nonwoven materials to specific test fluids.

Technical indicators

1. Inclination Angle of test bench: 10°, 25° and 30°;

2. Chunk: ￠100mm, weight (1.2±0.002)kg(can produce pressure of 1.5kPa);

3. Timing: 0-99.99min

Applicable standards (different standards require different accessories)

QB/T 2493-2000 diapers (including pad)

Nappies (tablets and pads)

Sanitary napkin (including sanitary pad)

3. Main parameters:

1. Standard drain funnel: 250mL;

2. Measuring cylinder: 500mL

3. Inclination Angle of test bench: 10°, 25° and 30°;

4. Chunk: ￠100mm, weight (1.2±0.002)kg(can produce pressure of 1.5kPa);

5. Timing: 0-99.99s.

6. Standard funnel: A: volume 80mL, used for infant diaper/sheet/pad test; B: volume 150mL, used for adult diaper/sheet/pad test; C: volume 60ml, used for sanitary napkin test

4. Operation process

Determination of slip permeability:

1. Install each part to the position shown in the figure. First, put the tester in the horizontal position, adjust the Angle between the upper panel and the lower panel to be (30 earth 2)°, and then adjust the lower opening of the funnel, so that the projection of its central point is (200±2)mm from the lower edge of the inclined plane plate of the tester, and the opening of the lower opening of the funnel faces the operator. Pour the appropriate amount of test solution into the funnel, moisten the funnel, wash the funnel with test solution twice, and set aside for use.

2. Apply for a test sample, it is on both sides of the elastic (including solid edge) after cut off, then the sample evenly on the slant board tester, use up, sample back above the incline plate, separately from the center of the specimen built-in absorption layer on each side measuring l00mm as test surface, will produce the part respectively to the top and bottom of the slope plate rebound, with four stainless steel clamp fixed sample, steel clamp shall not interfere with the flow of the solution. Adjust the height of the funnel so that the lower end of its lower mouth is 5-10mm away from the surface of the sample. Then put a beaker under the tester to collect the solution flowing down from the sample after infiltration. \

3. Measure the test solution accurately with a measuring cylinder, take 50mL of baby diapers/pad and 60mL of baby diapers/pad, and pour them into the adjusted standard drain funnel of baby diapers and diapers/pad; Take 150mL of adult diapers and diapers/pads and pour it into the adjusted standard drain funnel for adult diapers and diapers/pads. Then quickly open the funnel node to large, so that the solution flows freely to the surface of the sample and flows along the inclined plane into the beaker. After the solution is drained, close the funnel joint and wipe the lower entrance of the funnel so that there is no solution. Use a measuring cylinder to measure the solution in a beaker (accurate to 1mL) as the test result. If the test solution flows away from the side of the sample, the sample becomes invalid and another sample is taken for retesting.

4. Calculation of experimental results: the amount of slip permeability was expressed as the capacity (ml) of the unabsorbed test solution of the sample. 7 pieces were measured for each sample. Note: if less than 2 of the 7 samples (excluding 2 samples) have side flow, the results can be retained, but should be noted in the test report.

Determination of backpermeability:

1. Pour appropriate amount of test solution into the funnel, moisten the funnel, wash the funnel twice with the solution, remove the solution from the funnel, fix it on the bracket for use, and open the lower opening of the funnel to the operator. Take a sample to be tested and place it in a natural state on a filter paper with a sufficient mass known and put it under the funnel, so that the vertical distance between the projection of the center point of the bottom mouth of the funnel and the center point of the built-in absorption layer of the sample is 5mm -- lOmm. Measure the test solution accurately with a measuring cylinder. Measure 40mL of baby diapers of type S (including type S), 60ml of type M, and 80ml of type L (including type L). Take 150mL of adult diapers and pour it into the adjusted adult diapers, diapers/pads special standard drain funnel.

2. Open the power supply, and open the door to big funnel section, quickly make the solution to flow freely onto the surface of the specimen, and at the same time according to the "priming time" at the bottom of the "start" button to start the time, stay 5 min the buzzer ringing (press the reset button can stop the noise), "the second liquid injection time" stopwatch timing starts automatically the next five minutes, again with the funnel into the test solution, fluid volume with the former, the second five minutes when a buzzer rang (press the reset button can stop the noise), quick to phi 110 mm quality known several layers of filter paper (or more layers of filter paper without absorbing liquid) on the surface of the liquid sample, Meanwhile, the standard gauge with a diameter of 100mm,1.20kg was pressed on the filter paper, press the "start" button under the "pressure time" to start the timing, the standard gauge was removed when the pressure was 1min, weighing the quality of the filter paper with a balance. Press the reset key to reset the "pressure time". Close the tested funnel joint and erase the remaining solution at the bottom of the funnel.