Film blowing is a manufacturing process where a plastic material is melted and inflated into a thin film. It’s a popular method for producing plastic bags, films for packaging, and agricultural films. Because of its versatility and efficiency, film blowing is widely used for the production of a wide range of products.

PHA (Polyhydroxyalkanoates) is a bio-based polymer produced naturally by bacteria during their growth phase, also known as fermentation. Its environmentally friendly properties make it a compelling alternative to traditional plastics. PHA can be composted and is readily biodegradable in various environments without leaving harmful residues, like microplastics, making it a sustainable and responsible choice for plastic replacement.

While most PHA types can be processed similarly to other plastics, there are some unique characteristics to consider.

For instance, PHA has a lower melting temperature than many conventional plastics, meaning it consumes less energy. However, most PHA types also require longer cooling periods to facilitate the polymer’s crystallization. Particularly for film blowing, blowing the bubble with heated air is a requirement for stable production. Furthermore, PHA is more sensitive to moisture and high-shear rates than most other plastics, which can result in quality issues with the final product if not handled correctly within its proper processing window. Hence, it requires careful storage and preparation, like pre-drying, to ensure optimal results.

 

In some cases PHA can also be blended with other bioplastics like PBAT, in order to achieve a stable process.

 

Proper film blowing of PHA requires a thorough understanding of the material and its unique properties, as well as modifications to the standard processes. However, with its environmentally friendly attributes and potential for high production speeds, PHA undoubtedly offers the potential to become a more sustainable and efficient alternative to traditional plastics. With the right knowledge, preparation, and attention to detail, the use of PHA in film blowing can be a profitable, sustainable, and responsible choice for the future of plastic production.