Test method of moisture-proof performance of bubble bag Jinan Languang

Abstract: Moisture-proof performance is one of the basic properties of bubble bags. There are certain differences in the moisture-proof performance of different types of bubble bags. This paper uses the Labthink W3 / 030 water vapor transmission rate tester to test the water vapor transmission rate of the bubble bag sample to evaluate its moisture resistance, and through the test process, test principle, equipment parameters and scope of application, etc. The introduction of the paper provides a reference for the enterprise to detect the moisture resistance of the bubble bag.

Keywords: bubble bag, moisture resistance, water vapor transmission rate, water vapor transmission rate tester, cup method, weighing method

1. Significance

Most bubble bags are made of low-density polyethylene as raw materials. There are many small bubbles on the surface. Each bubble contains a certain amount of gas. When impacted or squeezed by an external force, these gases will play a buffering role. Therefore, the bubble bag has Shockproof, wear-resistant, soundproof, etc., commonly used in shock-absorbing cushioning and protection packaging for electronics, precision instruments, ceramics, handicrafts, household appliances, self-driving cars, kitchens, furniture, hardware tools, glass products, etc.

Precision products such as electronic products, instruments and meters are more sensitive to water vapor. Exposure to more water vapor will cause the product to get wet and cause performance degradation, or even scrapped. The bubble bag is used as the protective packaging of the above product, and its moisture resistance is affected by the product. The important factor of water vapor content in the environment. The water vapor transmission rate is an index to evaluate the moisture resistance of the bubble bag. This paper specifically tests the water vapor transmission rate of the bubble bag sample.

Figure 1 Common bubble bags

2. Test basis

At present, there are four main methods for measuring the water vapor transmission rate of plastic materials, namely cup method, electrolytic sensor method, infrared sensor method, and humidity sensor method. In order to prevent the bubbles in the sample from being crushed and damaged, try to keep the bubble bag The original appearance of this article uses the cup method to test the water vapor transmission rate of the sample. The test is based on the standard GB 1037-1988 "Test Method for Water Vapor Permeability of Plastic Films and Sheets".

3. Test samples

This test uses a white transparent bubble bag as the test sample to test its moisture resistance.

4. Test equipment

The test equipment used in this article is W3 / 030 water vapor transmission rate tester, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.

Figure 2 W3 / 030 water vapor transmission rate tester

4.1 Test principle

The cup method is also called the weighing method, which is to obtain the water vapor transmission rate of the sample by testing the change of the weight of the moisture-permeable cup. During the test, the sample is clamped in the moisture-permeable cup. By controlling the humidity inside and outside the moisture-permeable cup to cause a certain humidity difference, water vapor will penetrate through the sample from the high-humidity side to the low-humidity side. The weight changes. When the moisture-permeable cup is in a high-humidity environment, calculate the water vapor transmission rate of the sample by testing the weight increase of the moisture-permeable cup over time; when the humidity of the moisture-permeable cup is low, pass the test for the weight of the moisture-permeable cup over time Calculate the water vapor transmission rate of the sample.

4.2 Scope of application

(1) This equipment is suitable for testing the water vapor transmission rate of packaging materials and products such as films, sheets, paper and cardboard, textiles and non-woven fabrics. Among them, the film category includes various plastic films, paper-plastic composite films, geomembrane, coextruded films, waterproof and breathable films, aluminized films, aluminum foil, aluminum-plastic composite films and other film-like materials; sheet materials include various engineering plastics, Rubber, building materials (waterproof materials for construction), thermal insulation materials, such as PP, PVC, PVDC, nylon and other sheets.

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

4.3 Device parameters

Test range is 0.1 ~ 10000g / m2 · 24h, test accuracy is 0.01g / m2 · 24h; single test can test three samples at the same time; temperature range is 15 ~ 55 ℃, temperature control accuracy is ± 0.1 ℃, humidity range 10% RH ~ 98% RH, humidity control accuracy is ± 1% RH, temperature and humidity can be automatically controlled, wide range, high precision, can meet the test under various test conditions; standard purge air speed, effectively prevent moisture penetration The formation of a humidity gradient above the cup, the lifting and weighing of the moisture-permeable cup is controlled by the air cylinder, to ensure the accuracy and reliability of the test results; can provide dual rapid calibration mode of standard mold and standard weight to ensure the accuracy and versatility of the test data; Automatically clear before each weighing to ensure the uniformity and accuracy of the test data; support LystemTM laboratory data sharing system, unified management of test results and test reports.

5. Test process

Cut 3 pieces with a diameter of 74 mm from the surface of the sample, and clamp them in 3 permeable cups that have been poured into an appropriate amount of distilled water;

Place the moisture-permeable on the moisture-permeable cup holder of the equipment and close the test chamber door;

Set the sample name, test temperature, test humidity, test mode and other parameter information, click the test option, the device performs the test according to the set parameters, and automatically displays the test value of the sample's water vapor transmission rate after the test.

6. Test results

The average value of the water vapor transmission rate of the bubble bag sample tested this time was 13.913 g / (m2 · 24h).

7. Conclusion

The bubble bag is used as a protective packaging for the product. Its good moisture-proof performance can keep the product in a low humidity environment and effectively prevent the product from being damp. This article is based on the cup method principle equipment-W3 / 030 water vapor transmission rate tester to detect the water vapor transmission rate of the bubble bag sample. The test steps are simple, the device is easy to operate, the intelligence is high, and it can accurately reflect the bubbles The moisture resistance of the bag.

Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R & D and production of packaging testing equipment. Existing testing equipment can test the oxygen permeability, water vapor permeability, nitrogen permeability and carbon dioxide permeability of packaging materials Over-rate, tensile properties, heat seal strength, puncture resistance, tear performance, friction coefficient and other comprehensive performance indicators, to understand related testing equipment and testing services, you can log in to view. The more you understand, the more you trust! Labthink looks forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.

Plastic Food Tray

Plastic Food Tray,Plastic Catering Trays,Plastic Food Serving Trays,Plastic Container Tray

EVER GREEN(ZHEJIANG)NEW MATERIAL CO., LTD / KUNSHAN GREENPACK CO.,LTD , https://www.zjchangjingpack.com