Non-woven fabric moisture permeability testing program

Abstract: Non-woven fabric is a new generation of environmentally friendly materials. It is moisture-proof, breathable, flexible, light, non-combustible, and recyclable. In this paper, the Labthink Blue Light W3/031 Water Vapor Transmission Rate Tester is used to test the barrier properties of non-woven fabrics to external water vapor. The basic process of the test and the applicable scope and equipment parameters of the test equipment are introduced. Performance test equipment and test methods can be referred to.

Key words: non-woven fabric, moisture permeability, moisture resistance, weighing method, water vapor transmission rate, water vapor transmission rate tester

1, meaning

Non-woven fabric, also known as non-woven fabric, is made of oriented or random fibers and is suitable for use in agricultural film, medical, decorative, chemical, printing, automotive, building materials, furniture, clothing, tanning and packaging industries due to its appearance. Shaped like a pearl, also known as a pearl canvas. The moisture permeability of the non-woven fabric directly affects the effect of the non-woven fabric. If the water vapor transmission rate of the non-woven fabric is large, the waterproofing of the house or the leakage prevention of the baby diaper cannot be achieved. Therefore, the non-woven fabric should have high waterproof performance, and all production enterprises should strengthen the regular inspection of the water vapor transmission rate of the non-woven fabric.

Figure 1 Non-woven fabric

2, reference standard

At present, the test methods for the water vapor transmission rate of non-woven fabrics include weighing method (cup method), electrolysis method, humidity sensor method and infrared sensor method. The standard methods can be referred to as GB/T 1037-1988. Test method for water vapor permeability of films and sheets, Cup method, GB/T 21529-2008 "Determination of water vapor transmission rate of plastic film and sheet - Electrolytic sensor method", GB/T 30412-2013 "Plastic film and sheet Measurement of Water Vapor Transmission Rate Humidity Sensor Method, GB/T 26253-2010 "Infrared Detector Method for Measuring Water Vapor Transmission Rate of Plastic Films and Sheets". The standard referenced in this paper is GB/T 1037-1988.

3, test samples

Non-woven fabrics provided by a company.

4, testing equipment

The testing equipment used in this paper is the Labthink W3/031 water vapor transmission rate tester.

Figure 2 W3/031 water vapor transmission rate tester

4.1 Principle of the test

This equipment adopts the weighing method test principle. During the test, the sample is clamped in the moisture permeable cup, and a certain humidity difference is formed on both sides of the sample. The water vapor will pass through the high humidity side under the action of the humidity difference. The sample is infiltrated into the low-humidity side, and by measuring the change in the weight of the moisture-permeable cup over time, the parameters such as the water vapor transmission rate of the sample can be obtained.

4.2 Scope of application

(1) This equipment is suitable for testing the water vapor transmission rate of films, sheets, paper, cardboard, textiles, non-woven fabrics and other materials.

Film type: various plastic film, non-woven fabric, plastic composite film, paper-plastic composite film, geomembrane, co-extruded film, aluminized film, aluminum foil, aluminum-plastic composite film and other film-like materials.

Sheets: sheet materials such as PP, PVC sheet, PVDC sheet, nylon sheet, etc.

(2) This equipment can also be extended to the test of the cupping method of the sample and the water vapor transmission rate test of the liquid crystal display film, the solar backing plate, the sterile protective film, the cosmetic mask and the like.

(3) This equipment meets many national and international standards, such as GB/T 1037, GB/T 16928, ISO 2528, ASTM E96, ASTM D1653, TAPPI T464, DIN 53122-1, JIS Z0208, YBB00092003, etc.

4.3 Equipment parameters

l The test range of the device is 0.1 ~ 10000 g / m2 · 24h, and the resolution is 0.01 g / m2 · 24h.

l The temperature control range of the equipment is 15 °C ~ 55 °C, the temperature control accuracy is ±0.1 °C, the humidity control range is 10% RH ~ 98% RH, and the humidity control accuracy is ±1% RH.

l The equipment is equipped with three moisture permeable cups, and the three moisture permeable cups can be tested independently.

l The system adopts the intermittent weighing method that meets the standard requirements, and ensures the constant humidity difference inside and outside the moisture permeable cup through the standard purge wind speed.

l The device provides two kinds of quick calibration methods, standard film and standard weight, to ensure the accuracy and versatility of the test data.

l The equipment supports the test results comparison. The user sets the standard value and error range before the test starts. After the test is completed, the system automatically judges whether the test results are within the standard error range and intuitively informs the user.

l Supports the LystemTM laboratory data sharing system. The test data and device information can be reported simply by setting and operating, and the centralized and systematic management of laboratory test data can be easily realized.

5, the test process

(1) Cut 3 pieces of sample with a diameter of 74 mm from the surface of the sample.

(2) The specimens are respectively clamped in three moisture permeable cups, and then placed on the moisture permeable cup holder inside the device to close the test chamber door.

(3) Set the sample name, sample thickness, test temperature, test humidity and other parameters, click the "Start Test" option.

(4) After the test is over, the instrument automatically calculates and displays the test results.

6, test results

The water vapor transmission rates tested in this paper were: 18.3977 g/(m2·24h), 19.0226 g/(m2·24h), and 19.1384 g/(m2·24h).

7. Conclusion

W3/031 Water Vapor Transmission Rate Tester is a water vapor transmission rate tester specially designed for non-woven fabric testing. It has simple operation, high test accuracy and good repeatability. It can truly reflect non-woven materials. Moisture permeability. As a leader in R&D and manufacturing of packaging inspection equipment, Labthink is committed to providing professional testing services and equipment to customers around the world. For related testing equipment and testing services, you can log on to Jinan Languang website or consult. . The more you understand, the more trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.