Processing of PHA
by Blow Molding
In this post, we explore another common method for plastic processing: blow molding. We focus primarily on the innovative and alternative material, PHA (Polyhydroxyalkanoates), and its behavior during the blow molding process. Additionally, we will also discuss the advantages and potential of PHA, and the challenges and important considerations when selecting this material for blow molding.
What is Blow Molding?
Blow molding is a manufacturing process where a heated plastic tube (or parison) is inflated into a mold and takes its shape after cooling. It’s a popular method for producing hollow plastic products like bottles, containers, and other similar items. Because of its versatility and efficiency, blow molding 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 Blow Molding?
While most PHA types can be processed similarly to other plastics, there are some unique characteristics to consider.
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. 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.
Typically, Extrusion Blow Molding (EBM) requires a very high melt strength and high viscosity. Our PHAradox-blends have already proven to provide this functionality in operations at various customers.
Conclusion
Proper blow molding 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 blow molding can be a profitable, sustainable, and responsible choice for the future of plastic production.
Try PHA
Want to learn more about PHA and its role in blow molding? Reach out to our team of experts. We’re here to help you navigate this innovative material and its potential in your manufacturing processes.