The cup method moisture permeability meter detects the water vapor transmittance of the waterproof and breathable film material of the diaper

Abstract: The water vapor permeability of the waterproof breathable film is an important factor
affecting the comfort of diapers.
This paper uses the cup method principle to test the water vapor transmittance of the waterproof breathable film sample for diapers, and introduces the test principle, the relevant equipment test parameters, the scope of application and the test process, etc.
, to provide a reference
for the test of the moisture permeability of the relevant waterproof and breathable film materials 。 Keywords: water vapor permeability performance, water vapor transmittance, cup method, weighing method, water vapor transmittance tester, waterproof breathable film, diaper 1, the basic technical requirements of the waterproof breathable film are good waterproof performance and high water vapor permeability, which can be used in building structures and hygiene products on the basis of avoiding water leakage, and is widely used in building structures and hygiene products
。 For example, most of the waterproof breathable membrane used in diapers is made of polyethylene material with a certain amount of calcium carbonate after casting, blow molding or stretching and other different production processes, the amount of calcium carbonate added, the processing method and process parameters of the waterproof breathable film, thickness and other factors will affect the permeability of the waterproof breathable membrane to the water vapor, and the level of the performance directly affects the dryness, breathability and comfort of the diaper
.
In general, the higher the water vapor transmittance, the better the penetration performance of water vapor in the waterproof breathable film, the faster the water vapor can be discharged, and the baby feels comfortable
.
Therefore, monitoring and testing the water vapor transmittance of waterproof and breathable membranes is an important measure
to improve the quality of diapers.
2.
Test sampleThis paper takes the waterproof breathable membrane used in a brand of diapers as the test sample to test its water vapor transmittance
.
3, the test according to the material water vapor transmittance test methods include cup method, infrared sensor method, electrolytic sensor method, humidity sensor method, etc.
, in view of the high water vapor transmittance of the samples tested in this test, so the cup method principle is used for testing, the standard based on GB 1037-1988 "plastic film and sheet permeable vapor test method Cup method"
.
4.
Test equipment This test uses W3/031 water vapor transmittance tester to test the sample, the equipment is independently developed and produced
by Jinan Languang Electromechanical Technology Co.
, Ltd.
W3/031 Water Vapor Transmittance Tester 4.
1 Test Principle Cup Method Principle is to obtain the water vapor transmittance of the specimen by testing the change of the quality of
the wet cup with the permeation time.
During the test, the wet cup is filled with a certain amount of distilled water, the specimen is clamped on the wet cup, and the outside of the wet cup is in a low humidity environment by controlling the test conditions, so that the environment on both sides of the specimen has a certain humidity difference, and the water vapor will penetrate the specimen from the high humidity side into the low humidity side, causing the quality of the wet cup to be reduced
.
When the osmotic equilibrium is reached, the water vapor permeability and related parameters
of the specimen are calculated by testing the change of the quality of the permeable cup over time.
4.
2 Scope of application (1) Applicable to all kinds of plastic films, paper-plastic composite films, geomembranes, co-extruded films, aluminum-coated films, aluminum foils, aluminum foil composite films, waterproof and breathable membranes and other film-like materials, a variety of engineering plastics, rubber, building materials (waterproof materials for construction), insulation materials and other sheet materials, such as PP sheets, PVC sheets, PVDC sheets, nylon sheets, etc.
, paper, cardboard and in textiles, non-woven fabrics and other materials of water vapor transmittance test
.
(2) It can also be extended to the test
of water vapor transmittance of liquid crystal screen film, solar backplane, sterile invasive protection film, beauty mask, protective clothing material, etc.
(3) Meet a number of national and international standards, such as GB 1037, GB/T 16928, ASTM E96, ASTM D1653, TAPPI T464, ISO2528, DIN53122-1, JIS Z0208, YBB00092003
。 4.
3 Equipment parameters The test range of this equipment is 0.
1 ~ 10,000 g/(m2·24h), and the test accuracy is 0.
01 g/(m2·24h); The simultaneous testing of 3 specimens can be realized, that is, the test results of 3 specimens can be obtained from one test; The test temperature range is 15 ~ 55 °C, the temperature control accuracy is ±0.
1 °C, the test humidity is 10%RH ~ 98%RH, and the humidity control accuracy is ±1%RH; Standard purge wind speed can ensure that the humidity difference between the inside and outside of the permeable cup is constant; Provide two fast calibration methods of standard film and standard weight to ensure the accuracy and versatility of test data; The weighing method of the permeable cup designed by the mechanical structure effectively ensures the accuracy and stability of the data; Support LystemTM laboratory data sharing system, easy to realize the centralized and systematic management of laboratory test data; The calibration data recovery function effectively solves the adverse effects caused by misoperation, ensures the safety of the system work to the greatest extent, and the system can repair the key information data in accordance with the way set by the user, such as the calibration data recovery operation
of each sensor.
5.
Test process (1) Use the sampler to cut 3 specimens with a diameter of 74 mm from the surface of the waterproof breathable film sample
.
(2) Fill a certain amount of distilled water into the wet cup and place the cut specimens in
3 wet cups.
Prevent water from splashing on
the specimen during clamping.
(3) Put the moisture cup with the clamped specimen into the wet cup holder in the test chamber of the equipment and close the test chamber door
.
(4) Set the parameter information such as specimen name, test temperature, humidity, test mode and so on the equipment control software, click the test option, and the test begins
.
The equipment automatically performs intermittent weighing according to the set parameters and calculates the water vapor transmittance
of the displayed specimen according to the weighing results.
6.
Test resultsThe test results of the three specimens measured in this test are 1829.
11 g/(m2·24h), 1883.
67 g/(m2·24h), 1845.
29 g/(m2·24h), and the water vapor transmittance of the waterproof breathable film sample used in the diaper is 1852.
69 g/(m2·24h).

7.
Conclusion Waterproof breathable film is an important part of diapers, which has the characteristics of preventing urine leakage and can quickly discharge water vapor, which has an important impact on
the comfort of diapers.
In this paper, the water vapor permeability of the waterproof breathable film sample is tested to verify the water vapor permeability of
the sample.
The test process is simple, the equipment is easy to operate, the degree of intelligence is high, and the tedious human weighing process and its interference with the penetration process and test results are avoided, and the test results are accurate and reliable
。 Jinan Languang Electromechanical Technology Co.
, Ltd.
is a professional engaged in packaging testing equipment R & D and production and packaging testing services technology enterprises, the existing equipment also includes intelligent electronic tensile testing machine, thickness gauge, sealer, oxygen transmittance tester, coefficient of friction meter, tear tester, heat seal tester, impact tester, carton pressure machine and other testing equipment, related equipment information You can log on to Jinan Languang company website to view specific information or call for consultation
.
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