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Before we delve into the low haze characteristics of transparent EVOH sealing film, we first need to understand the concept of "haze". Haze, as an important indicator to measure the light transmittance of transparent materials, intuitively reflects the degree of scattering of light when passing through the material. Simply put, when a beam of light is irradiated on a transparent material, part of the light will pass through the material in a straight line, while another part of the light may be scattered due to tiny defects, impurities or uneven molecular structure inside the material, forming diffuse reflection light. These scattered rays will make the image through the material blurry, reduce the transparency of the material, and increase the haze value.
For packaging materials, low haze means that light can maintain a high straight-line propagation efficiency when passing through the film material, reduce scattering and blurring, and thus ensure that the product color in the package is true and the details are clear. This feature is particularly important in display packaging because it is directly related to the formation of consumers' first impression of the product.
The reason why transparent EVOH sealing film can achieve low haze is due to its unique molecular structure and sophisticated production process. As a high-performance barrier material, EVOH (ethylene-vinyl alcohol copolymer) has excellent transparency and barrier properties. However, to achieve low haze, strict control is required in multiple links such as raw material selection, formula design, extrusion process and subsequent processing.
In terms of raw material selection, transparent EVOH sealing film uses high-purity EVOH resin as the basic raw material to ensure that there are no impurities inside the film and the molecular structure is uniform. By adding appropriate amounts of modifiers and additives, the optical properties and processing properties of the film are further optimized. In the formula design link, researchers need to accurately calculate the ratio of various raw materials to achieve the best haze control effect.
Extrusion process is a key link in the production of transparent EVOH sealing film. In this step, the raw materials are melted and extruded into film under high temperature and pressure. Parameters such as extrusion temperature, screw speed, and die design will directly affect the haze value of the film. In order to obtain low-haze film materials, manufacturers need to use advanced extrusion equipment and precise control systems to ensure the stability and uniformity of the extrusion process.
Subsequent steps such as cooling, shaping, stretching and surface modification will also affect the haze of the transparent EVOH sealing film. By optimizing these process parameters, the haze value of the film can be further reduced and the transparency of the product can be improved.
Transparent EVOH sealing film with low haze is widely used and important in the packaging field. It not only ensures the true color and clear details of the products in the package, but also enhances the overall visual effect and attractiveness of the product. In food packaging, transparent EVOH sealing film with low haze allows consumers to clearly see the freshness and color of the food, enhancing their purchasing confidence. In the packaging of cosmetics and personal care products, low haze film can perfectly present the texture and color of the product, enhance the brand image and consumer experience. In the packaging of electronic products and precision instruments, transparent EVOH sealing film with low haze can show the exquisite design and detailed craftsmanship of the product, and enhance consumers' trust in the product quality.
In addition to improving the visual effect, transparent EVOH sealing film with low haze has many other advantages. For example, it can effectively block the penetration of harmful substances such as oxygen and moisture, and extend the shelf life of the product. It also has good heat resistance and chemical corrosion resistance, and can maintain stable performance in various harsh environments.
With the advancement of technology and the continuous improvement of consumer requirements for product quality, the performance of low-haze transparent EVOH sealing film is also being continuously optimized and upgraded. On the one hand, researchers are exploring new raw materials and formulas to obtain films with lower haze and higher transparency. On the other hand, manufacturers are also constantly improving production processes and equipment to improve product production efficiency and stability. In order to meet the diverse needs of packaging materials in different fields, researchers are also studying low-haze transparent EVOH sealing films with special functions, such as antibacterial, UV protection, and degradability.
