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What Causes 77% Shrink Rate PLA Film?
The 77% shrink rate of PLA film is primarily caused by the inherent properties of polylactic acid (PLA) itself. PLA is a biodegradable polymer derived from renewable resources such as corn starch or sugarcane. This biopolymer has gained popularity in recent years due to its eco-friendly nature and versatility in various applications, including packaging films.
The high shrink rate of PLA film can be attributed to its low glass transition temperature (Tg) and low melting point. PLA has a Tg of around 60-65°C, which means that the polymer begins to soften and deform at relatively low temperatures. When subjected to heat, PLA film shrinks significantly due to the molecular rearrangement and relaxation of polymer chains.
Furthermore, the crystallinity of PLA also plays a crucial role in determining its shrink rate. Crystalline regions in the polymer structure tend to restrict molecular movement, resulting in low shrinkage. However, PLA has relatively low crystallinity compared to other polymers, leading to higher shrink rates.
The high shrink rate of PLA film has both positive and negative implications. On the one hand, the shrinkability of PLA film makes it ideal for packaging applications where tight wrapping around products is desired. This can help improve product presentation and reduce the amount of packaging material required.
On the other hand, the high shrink rate poses challenges in terms of processing and handling. During the production of PLA film, manufacturers need to carefully control processing conditions such as temperature and cooling rate to minimize shrinkage variations. Additionally, the shrinkage of PLA film can affect the dimensional stability of packaged products, especially in high-temperature environments.
In conclusion, the 77% shrink rate of PLA film is predominantly influenced by the polymer's low Tg, low melting point, and low crystallinity. Understanding the factors contributing to PLA film shrinkage is essential for optimizing production processes and ensuring the quality of packaged products. Despite the challenges posed by high shrink rates, the eco-friendly nature of PLA film continues to drive its demand in the packaging industry. Embracing innovative solutions and advancements in PLA technology can further enhance the performance and sustainability of PLA film in the future.
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