Packaging Film That Meets the Highest Standards of Food Safety.

A packaging film is considered "sealable" if it can form a strong, hermetic bond when heat and pressure are applied, which is how most flexible packages are closed. This property is usually provided by a specific sealant layer. For example, in a multi-layer potato chip bag, the outer layer might be a printable BOPP film, but the innermost layer will be a material like PE or a special co-polymer chosen for its low melting point and ability to form a quick, strong seal. The integrity of this seal is critical for product protection. The process of creating the film ensures this sealant layer is perfectly uniform, so that when it goes through a packaging machine, it seals reliably every time, preventing leaks and preserving freshness for the end consumer.

The choice of packaging film has a massive impact on a product's overall environmental footprint. The industry is actively moving in several sustainable directions. Firstly, "lightweighting" involves using the thinnest possible film that still meets performance requirements, thereby reducing the total amount of plastic used. Secondly, there is a major shift towards designing for recyclability, which favors the use of mono-materials over complex, non-recyclable laminates. Thirdly, there is growing interest in films made from recycled content (PCR - Post-Consumer Recycled) and bio-based plastics derived from renewable resources like corn or sugarcane. The converting machinery used to process this packaging film must also be efficient, minimizing energy consumption and material waste during the printing and coating processes.

Graphics are typically applied to a packaging film using high-speed printing processes, with flexography (flexo) and rotogravure being the most common for high-volume production. In flexo printing, a flexible plate transfers ink to the film's surface. Modern CI (Central Impression) flexo presses are renowned for their ability to print stunning, high-resolution graphics on a wide variety of delicate and extensible films. Often, the printing is done in "reverse" on the backside of a clear outer film. When this printed film is laminated to other layers, the ink becomes trapped between them, protecting it from scuffing and ensuring it never comes into contact with the product. This process is what creates the vibrant, durable branding seen on most flexible packaging film.

A mono-material packaging film is made from a single type of plastic (e.g., 100% Polyethylene). The primary advantage of this is its recyclability, as it can be easily sorted and processed in an established recycling stream. However, a single material may not possess all the required properties, such as a strong seal, a good gas barrier, and high print quality. This is where a multi-layer or laminated packaging film comes in. It is a composite structure where different materials are bonded together, with each layer contributing a specific function—one layer for strength, another for barrier, and an outer layer for printability. While historically offering higher performance, the industry is now heavily focused on developing high-performance mono-materials to improve sustainability.

A barrier packaging film is specifically designed to prevent or strictly limit the transmission of atmospheric gases, moisture, and light. This is absolutely critical for preserving the quality, freshness, and safety of sensitive products, especially food and pharmaceuticals. The barrier is created either by using a material with natural barrier properties (like aluminum foil) or, more commonly, by applying a specialized coating (like EVOH or metallized layers) to a base film. For example, a barrier packaging film used for coffee beans will prevent oxygen from entering and making the beans stale, while also keeping the coffee's own aromatic oils from escaping. Without effective barrier properties, the shelf life of many products would be reduced to mere days.

The world of packaging film is dominated by a few key polymers, each chosen for its unique properties. The most common is Polyethylene (PE), which includes variants like LDPE (Low-Density) for bags and HDPE (High-Density) for stronger applications. Polypropylene (PP), particularly Biaxially Oriented Polypropylene (BOPP), is prized for its exceptional clarity, stiffness, and printability, making it a favorite for snack foods and confectionery. Polyethylene Terephthalate (PET) is another major player, known for its excellent strength, heat resistance, and good barrier properties, often used in laminated structures. Each of these materials can be used on its own (as a monofilm) or combined with others to create a composite packaging film with tailored performance characteristics.