Introduction
In the modern packaging industry, the performance of materials plays a vital role in the shelf life and quality of products. Among them, water vapor transmission rate (WVTR) is an important indicator for measuring the moisture-proof performance of packaging materials. As a precision testing equipment, water vapor transmission rate meter is widely used in the performance evaluation of various packaging materials. This article will explore the working principle, application field and importance of water vapor transmission rate meter in the packaging industry.
Definition of water vapor transmission rate
Water vapor transmission rate refers to the amount of water vapor passing through a unit area of ??material per unit time, usually in g/(m²·24h). It reflects the barrier ability of the material to water vapor under certain temperature and humidity conditions. For packaging materials, lower water vapor transmission rate means better moisture-proof performance and can more effectively protect the contents from moisture.
Working principle of water vapor transmission rate meter
The water vapor transmission rate meter measures the water vapor transmission rate of packaging materials by simulating the humidity and temperature conditions in the actual use environment. Its basic working principle includes the following steps:
1. Sample preparation: Cut the packaging material to be tested into samples of specified size.
2. Fix the sample: Fix the sample in the test chamber to ensure that it forms a seal with the humidity source and the detection sensor.
3. Control humidity: Maintain constant humidity conditions (usually 100% relative humidity) on one side of the test chamber and low humidity conditions on the other side.
4. Measure the permeability: By detecting the humidity changes on both sides of the material, calculate the amount of water vapor transmitted per unit time, and thus obtain the water vapor permeability.
Application field
Packaging industry
In the fields of food, medicine, cosmetics, etc., the moisture resistance of packaging materials directly affects the shelf life and quality of products. Water vapor transmission rate meter can help companies choose suitable packaging materials and improve the preservation effect of products. For example, in food packaging, low moisture permeability materials can effectively prevent food from getting damp and deteriorating, thereby extending the shelf life.
Electronic products
For electronic components and equipment, moisture resistance is an important factor to ensure their normal operation. Water vapor transmission rate meter can help evaluate the moisture resistance of electronic product packaging materials and ensure the stability and reliability of products in humid environments.
Medical devices
The packaging requirements of medical devices are strict and need to prevent the intrusion of moisture and other contaminants. Through the test of water vapor transmission rate meter, it can be ensured that medical devices remain sterile and safe during storage and transportation.
Advantages of water vapor transmission rate meter
High precision
Modern water vapor transmission rate meter adopts advanced sensing technology and automatic control system, which can provide high-precision and high-repeatability test results.
Easy operation
The water vapor transmission rate meter is humanized in design, simple to operate, and the test process is highly automated, which greatly reduces the possibility of human error.
Diversified test conditions
The instrument can simulate the humidity and temperature conditions of a variety of actual use environments to meet the testing needs of different materials and application scenarios.
Conclusion
As an important test equipment, water vapor transmission rate meter plays a key role in the performance evaluation of packaging materials. By accurately measuring the water vapor transmission rate of packaging materials, enterprises can select suitable materials, optimize packaging design, and ensure the quality and safety of products during storage and transportation. With the continuous advancement of technology, water vapor transmission rate meters will continue to be widely used in various industries, providing strong support for improving product quality and extending product shelf life.
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