Processing of PHA
by Film Blowing

image of film

In this post, we delve into yet another common method for plastic processing: film blowing. We focus primarily on the innovative and alternative material, PHA (Polyhydroxyalkanoates), and its behavior during the film blowing process. Additionally, we will also discuss the advantages and potential of PHA, and the challenges and important considerations when selecting this material for film blowing.

What is film blowing?

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.

What is PHA?

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.

How does PHA behave in film blowing?

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.
 

Conclusion

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.

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Want to learn more about PHA and its role in film blowing? Reach out to our team of experts. We’re here to help you navigate this innovative material and its potential in your manufacturing processes.

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