Adaptability of high barrier film
DATE：2019/9/25 8:40:41 / READ： / SOURCE：This station
Adaptability of high barrier film
As a functional plastic film, high barrier film pursues high barrier properties against gases and water vapor. However, as the end use of the product, it is mainly the soft packaging material of food and medicine, which also meets the technical requirements of product packaging and packaging operations. Therefore, the performance of the high barrier film is highly adaptable.
Different barrier resins have different gas permeability and water vapor transmission rate. Some high-barrier resins such as EVOH and PA, although the gas permeability is small, are easy to absorb air moisture, and have a large water vapor transmission rate; although the general polyolefin resin has a large gas permeability, it has good moisture resistance. , the water vapor transmission rate is small. Therefore, the barrier film having better barrier properties is not made of a single resin, but a multilayer film of a plurality of resin composites.
The barrier film should meet the requirements of product packaging and packaging operations, and should also have high heat seal strength, easy molding process, easy to seal and easy to expose, no leakage, easy to print and other properties. Therefore, even for a multilayer barrier film having the same barrier properties, the layer structure may have different combinations depending on the application.
In order to improve the market competitiveness of barrier films, the cost of barrier films should be controlled. Because some barrier resins are expensive (such as the price of PVDC resin, which is 2-4 times the price of general-purpose resin), the thickness of the barrier layer of the film increases, although the barrier property can be improved, but the barrier will be high due to the high cost. The range of applications of the membrane is limited. Therefore, the multilayer barrier film should also control the total thickness of the film and the thickness of each layer during production.
As a functional plastic film, high barrier film pursues high barrier properties against gases and water vapor. However, as the end use of the product, it is mainly the soft packaging material of food and medicine, which also meets the technical requirements of product packaging and packaging operations. Therefore, the performance of the high barrier film is highly adaptable.
Different barrier resins have different gas permeability and water vapor transmission rate. Some high-barrier resins such as EVOH and PA, although the gas permeability is small, are easy to absorb air moisture, and have a large water vapor transmission rate; although the general polyolefin resin has a large gas permeability, it has good moisture resistance. , the water vapor transmission rate is small. Therefore, the barrier film having better barrier properties is not made of a single resin, but a multilayer film of a plurality of resin composites.
The barrier film should meet the requirements of product packaging and packaging operations, and should also have high heat seal strength, easy molding process, easy to seal and easy to expose, no leakage, easy to print and other properties. Therefore, even for a multilayer barrier film having the same barrier properties, the layer structure may have different combinations depending on the application.
In order to improve the market competitiveness of barrier films, the cost of barrier films should be controlled. Because some barrier resins are expensive (such as the price of PVDC resin, which is 2-4 times the price of general-purpose resin), the thickness of the barrier layer of the film increases, although the barrier property can be improved, but the barrier will be high due to the high cost. The range of applications of the membrane is limited. Therefore, the multilayer barrier film should also control the total thickness of the film and the thickness of each layer during production.
Author：admin