Three mainstream high barrier packaging materials
EVOH (ethylene and vinyl alcohol copolymers) as an excellent high barrier packaging material, has been widely used in food packaging for multi-layer film, cup, plate, bottle and other containers in Europe, the United States, Japan and other advanced countries. In recent years, EVOH has also received extensive attention in China. With the advancement of molding processing technology, EVOH can now complete casting, inflation, blow molding, injection molding, and coating and other molding processes in a co-extrusion manner, especially in high-barrier pesticide bottles. BottleNet reporters would especially recommend the first company in China to introduce and sell EVOH, Kunshan Huayi Plastics Co., Ltd. They are currently at the leading position in EVOH business and R&D, and can provide customers with one-stop solutions.
PA, commonly known as nylon, known as polyamide, is a linear thermoplastic polymer and is a medium barrier material. PA has good puncture resistance and can be used for the packaging of irregular, hard foods. PA also has excellent high temperature resistance and low temperature resistance, and can adapt to various packaging environments and transportation environments.
PVDC has good oxygen barrier and water resistance. However, since PVDC is easily crystallized, the processability of PVDC is poor. If other materials are added to improve processability, the barrier properties of PVDC will be reduced.
As can be seen from the following table (Table 1), EVOH and PA are environmentally friendly materials, and PVDC can cause pollution if it is not properly treated; the barrier property of EVOH will change greatly with the change of humidity, PVDC It will not be influenced by the outside world and belongs to the all-weather high barrier packaging material; PA is a medium barrier packaging material, but has been widely used due to its excellent puncture resistance and high temperature resistance.
Barrier contrast
In the field of plastic packaging, our commonly used barrier packaging materials are PVDC, EVOH and PA. We can make a comprehensive comparative analysis of their oxygen barrier and water resistance.
The oxygen barrier of EVOH is significantly higher than that of any other material, about 10,000 times that of polyethylene, but it will change with the change in relative humidity. EVOH also has excellent barrier properties to carbon dioxide, nitrogen, helium, and other gases. EVOH not only excels in the barrier properties of the aroma components, but also the adsorption of the aroma components on the surface is small. The performance of PA is the same as that of EVOH. As the humidity increases, the oxygen barrier performance rapidly decreases. In 100% humidity, the oxygen barrier of PA is 1/4 when the humidity is 30%. In addition, PA will undergo dimensional changes when it encounters water, so we rarely see high-moisture products directly packaged with PA. PVDC materials, due to their symmetrical molecular structure and presence of hydrophobic chlorine, ensure that the oxygen permeability does not change with humidity. Experiments have shown that EVOH (38%) has better oxygen barrier performance than PVDC when humidity is 0% to 70%, and PVDC has better oxygen barrier performance than EVOH under humidity conditions exceeding 80%.
Domestic EVOH large supplier recommended
Kunshan Huayi Plastic Co., Ltd.
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Contact person: Mr. Chen
Contact address: Zhangpu Town, Kunshan City, Jiangsu Province
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