What is the effect of processing conditions on the stability of my10 series pbt for filament spinning

In modern industry, factors such as temperature control, injection pressure and speed, mold design and cooling, ambient humidity and drying treatment play a vital role in the production quality and performance of PBT (polybutylene terephthalate) fibers.

Temperature control: ensuring the stability of the molecular chain
Temperature is one of the key factors affecting the quality of fiber processing. The melting point of MY10 series PBT is relatively high, and its molecular chain has strong mobility and tendency to rearrange under high temperature conditions. Therefore, during the spinning process, the temperature control of the barrel, mold and nozzle is particularly important. Zhejiang Amerisource New Material Co., Ltd. uses a high-precision temperature control system to ensure that the barrel temperature is controlled between 240 and 280°C (for glass fiber reinforced PBT, the temperature is set at 230 to 260°C), and the mold temperature is maintained at 40 to 60°C (60 to 80°C for glass fiber reinforced). This series of temperature control measures effectively maintains the stability of the PBT molecular chain, avoids molecular chain degradation caused by excessively high temperature or insufficient plasticization caused by too low temperature, thereby ensuring the uniformity and strength of the fiber.

Injection pressure and speed: affecting the orientation and structure of fibers
During the spinning process, injection pressure and speed have a direct impact on the orientation and internal structure of MY10 series PBT fibers. Zhejiang Amerisource New Material Co., Ltd. flexibly adjusts injection pressure and speed according to the needs of different fibers. Generally, PBT melt has low viscosity and good fluidity, so a medium injection pressure (60 to 90MPa, 80 to 100MPa for glass fiber reinforced type) can be used to ensure that the melt can evenly fill the mold. At the same time, appropriately increasing the injection speed can not only reduce the shrinkage and deformation of the fiber, but also effectively reduce the risk of overflow and nozzle drooling. To this end, the company's technical team precisely controls the injection speed and comprehensively considers various factors to strive to achieve the best balance between fiber structure and performance.

Mold design and cooling: ensuring dimensional stability and crystallinity
The design of the mold and its cooling conditions have an important impact on the dimensional stability and crystallinity of MY10 series PBT fibers. Zhejiang Amerisource New Material Co., Ltd. pays special attention to the short, thick and round design of the flow channel in mold design to reduce the resistance and pressure loss during the flow of the molten material, thereby improving the filling efficiency and product quality. At the same time, the company introduced an efficient cooling system to ensure that the mold temperature is quickly and evenly reduced, which is conducive to the rapid crystallization and dimensional stability of the fiber. This sophisticated design not only improves the crystallinity and strength of the fiber, but also effectively shortens the production cycle and improves the overall production efficiency.

Ambient humidity and drying treatment: Prevent molecular chain degradation
Although the MY10 series PBT has low hygroscopicity, moisture may still have a significant impact on the molecular chain under high temperature conditions, causing the material to darken in color, surface scars, and even degradation. Therefore, it is crucial to carry out sufficient drying treatment before spinning. Zhejiang Amerisource New Material Co., Ltd. uses advanced drying equipment to ensure that the raw materials are dried at 80 to 100°C for about 4 hours (or adjust the drying temperature and time according to the specific situation) to completely remove moisture from the raw materials. This treatment not only enhances the stability of the fiber, but also effectively extends the service life of the product.