US film manufacturer Spartech has published a brief description of the comparison of the characteristics of the two main barrier materials. The main points that determine which barrier material to use include oxygen barrier rate, water vapor barrier rate, both, or carbon dioxide rejection.
The most common barrier material in hard packaging is EVOH, which provides high-resistance packaging materials, but has limited effectiveness in high-humidity applications, where PVDC is the most suitable choice.
Advantages of EVOH:
1. Provide high barrier performance in low humidity environment
2. Good barrier effect on chemicals, including most oils, acids and solvents.
3. High transparency: to ensure easy implementation of manipulation
4. Aroma, good feel
5. EVOH can be co-extruded with a variety of polymers
Disadvantages of EVOH:
1. Hygroscopicity, may affect the processing process and the use of end customers
2. Poor performance in high pressure environments
3. Compared with other polymers, the moisture resistance is not good.
Advantages of PVDC
1. High gas resistance and high moisture resistance
2. The air resistance effect is not affected by high humidity environment
3. Performs well during cooking
Disadvantages of PVDC
1. Thermal sensitivity, more difficult to process
2. Bad transparency
3. The number of processors that provide co-agent production in hard packaging is small
4. Environmental protection is not optimistic, especially in Europe
5. Higher price due to complicated processing
Uv Stabilizer,Uv Curable Materials,Uv Light Sterilizer,Uv-Curing Materials
Henan Tianfu Chemical Co.,Ltd , https://www.tianfuchem.com