[Chinese Packaging News] Polystyrene (PS) film typically has a thickness ranging from 0.004 mm to 0.1 mm. Unlike some other films, PS film is not brittle when it's not stretched, which makes it ideal for biaxial stretching. This process enhances its mechanical properties and makes it more suitable for various packaging applications. The film is known for its high transparency, excellent dimensional stability, and non-toxic nature. However, it is relatively rigid compared to other flexible films.
Due to its moderate breathability, polystyrene film is well-suited for packaging fresh products that continue to respire during storage, such as fish, meat, and vegetables. It helps maintain the freshness of these items by allowing controlled gas exchange.
Polystyrene film is one of the easiest materials to stretch-oriented, beginning to soften at around 100°C. Even with a high melt viscosity, it can still be stretched effectively up to 130°C. After biaxial orientation, the film’s barrier properties improve significantly, making it more resistant to moisture and gases. Two common methods for producing oriented PS film are the bubble or flat-film techniques.
In addition to its use in regular packaging, PS film is also suitable for thermoforming. It is often used to produce containers like bowls, trays, and cups, where the film thickness is generally above 0.100 mm. Its rigidity and heat resistance make it ideal for these applications.
Another notable feature of PS film is its ability to act as a heat-shrinkable film. It can shrink by up to 45-55% when exposed to temperatures between 70°C and 120°C, making it a popular choice for shrink wrapping.
Lastly, due to its excellent optical clarity, polystyrene film is frequently used as a window material in packaging. This allows consumers to see the product inside without opening the package, enhancing both aesthetics and functionality.
Overall, polystyrene film remains a versatile and widely used material in the packaging industry, offering a balance of transparency, strength, and cost-effectiveness.
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