English
عربى
During the freezing process of frozen food, the moisture inside the food will condense into ice crystals, causing the food volume to expand. This phenomenon not only tests the flexibility and strength of the packaging material, but is also directly related to the safety of the food during storage and transportation. Traditional packaging materials, such as single-layer polyethylene film or paper-plastic composite materials, tend to become brittle and hard at low temperatures, and are difficult to withstand the pressure caused by the volume expansion of food, which can easily lead to packaging rupture, and then cause food contamination or quality degradation. Therefore, finding a packaging material that can maintain flexibility and strength under low temperature conditions and has good barrier properties has become an important topic in the food packaging industry.
It is in this context that the seven-layer asymmetric co-extruded low-temperature film came into being. This innovative packaging material is made by co-extruding seven layers of films with different materials and functions. Each layer is carefully designed and proportioned to achieve the best low-temperature stability and comprehensive performance.
Interlayer structure design: The uniqueness of the seven-layer asymmetric co-extruded low-temperature film lies in the ingenious design of its interlayer structure. Different material layers are closely connected by a special adhesive layer, which not only ensures the close bonding between the layers, but also avoids the separation between the layers caused by different thermal expansion coefficients of the materials. This design not only enhances the overall strength and toughness of the film, but also enables the film to maintain excellent flexibility and deformation resistance at low temperatures.
Deformation and rupture resistance: During the freezing process, the seven-layer asymmetric co-extruded low-temperature film can effectively cope with the pressure caused by the volume expansion of food with its excellent deformation and rupture resistance. Even under extreme low temperature conditions, the film can fit closely to the surface of the food to prevent food contamination or quality degradation caused by packaging rupture. This feature is due to the use of specially formulated polyethylene (PE) or other low-temperature tough materials in the film, which can maintain good molecular chain activity at low temperatures, thereby preventing the film from becoming hard and brittle.
Barrier properties: In addition to excellent low-temperature stability, the seven-layer asymmetric co-extruded low-temperature film also has excellent barrier properties. By precisely controlling the composition of each layer of materials, such as using high-efficiency barrier materials such as ethylene-vinyl alcohol copolymer (EVOH), the film can effectively block oxygen, moisture, carbon dioxide, etc., thereby delaying the oxidation and deterioration process of food and maintaining the original flavor, color and nutritional value of food. This feature is of great significance for extending the shelf life of frozen food and reducing food loss.
The application of seven-layer asymmetric co-extruded low-temperature film in frozen food packaging not only improves the safety and quality of food, but also optimizes the efficiency of various links such as packaging, transportation and storage.
Packaging link: During the packaging process, the seven-layer asymmetric co-extruded low-temperature film can fit tightly to the surface of the food, reduce the residual air inside the packaging, and thus reduce the risk of oxidation and deterioration. At the same time, the flexibility and strength of the film make the packaging process smoother, reducing breakage and waste.
Transportation link: During long-distance transportation, the seven-layer asymmetric co-extruded low-temperature film can effectively resist the impact and extrusion of the external environment and protect food from physical damage. Its excellent barrier properties can also prevent food from deteriorating due to temperature changes during transportation, ensuring that the food can still maintain the best quality when it arrives at its destination.
Storage link: Under frozen storage conditions, the seven-layer asymmetric co-extruded low-temperature film can maintain its excellent low-temperature stability and barrier properties, providing long-term and stable protection for food. This feature not only extends the shelf life of food, but also reduces food loss and waste caused by packaging rupture.
While pursuing high performance, the seven-layer asymmetric co-extruded low-temperature film also pays attention to environmental protection and sustainability. The use of recyclable materials reduces environmental pollution during the production process, which is in line with the modern packaging industry's pursuit of green and environmental protection. In addition, its efficient packaging performance reduces the loss of food during transportation and storage, and indirectly promotes the effective use of resources. With the increasing awareness of consumers about environmental protection and the global emphasis on sustainable development, the application prospects of the seven-layer asymmetric co-extruded low-temperature film in the field of green packaging will be broader.
