The fibrillation degree of polypropylene yarn, particularly in pp fibrillated yarn production, is influenced by several critical factors. Firstly, the polymer's molecular weight plays a significant role; higher molecular weights can lead to increased strength but may reduce the extent of fibrillation. The spinning process, including the type of spinning method employed—whether it be wet, dry, or melt spinning—also affects how the fibers behave during production.
Temperature is another crucial factor; higher processing temperatures can enhance the fibrillation process, leading to finer filaments. Additionally, the presence of additives such as slip agents and antistatic agents can modify the surface properties of the yarn, impacting fibrillation. The draw ratio during the stretching phase is essential, as a higher draw ratio typically results in greater alignment of the polymer chains, promoting fibrillation.
Finally, the cooling rate post-spinning can significantly influence fibrillation; rapid cooling may lock the fibers in a less fibrillated state, while slower cooling allows for better fibrillation development. Understanding these factors is vital for manufacturers aiming to optimize the properties of PP fibrillated yarn for various applications, such as geotextiles and agricultural products.