Composite film typically refers to a type of packaging material used in various industries, including food, pharmaceuticals, and consumer goods. It is made by laminating or bonding multiple layers of different materials together to create a single, cohesive structure that offers specific properties and functionalities.
The composition of composite films can vary widely depending on the intended use, but they often consist of layers such as:
1. Barrier layers: These are designed to provide protection against external factors such as moisture, oxygen, light, and aroma, which can degrade the quality and shelf life of the product. Materials commonly used for barrier layers include aluminum foil, metallized films, and specialized polymers.
2. Sealant layers: These layers are responsible for forming a strong seal to contain the contents of the package and prevent leakage or contamination. Polyethylene (PE), polypropylene (PP), and other thermoplastic materials are commonly used as sealants due to their heat-sealing properties.
3. Structural layers: These layers provide strength, durability, and dimensional stability to the composite film. They may include materials such as polyester (PET), nylon (PA), or oriented polypropylene (OPP).
4. Print layers: If the packaging requires branding, product information, or decorative elements, a printable layer may be included to allow for high-quality printing using various printing techniques.
Composite films can be customized to meet specific requirements regarding barrier properties, flexibility, transparency, printability, and compatibility with different packaging processes (e.g., form-fill-seal machines). They are widely used for packaging a wide range of products, including snacks, beverages, frozen foods, medical devices, and more, due to their versatility and ability to provide protection and preserve product freshness.
