What are the precautions in the production process of my10 series pbt for filament spinning

In the modern textile industry, the raw material preparation stage is regarded as a crucial link in the production process. Due to its unique water absorption, MY10 series polybutylene terephthalate (PBT) must be strictly dried before production. Usually, the required drying temperature is 130 to 150°C for 4 to 6 hours to ensure that the moisture content drops below 0.02%. If the moisture content exceeds the standard, the material may undergo hydrolysis during the subsequent high-temperature spinning process, resulting in defects such as silver threads and bubbles on the fiber surface. This not only affects the appearance of the fiber, but also significantly reduces its mechanical and thermal properties. Therefore, the effectiveness of the drying process is directly related to the quality of the final product.

After the raw material is dried, temperature control becomes the core link in the spinning production of MY10 series PBT. The precise setting of the spinning temperature is the key to ensure that the material is fully melted and has good fluidity. The temperature of the barrel is usually set between 260 and 290°C, while the nozzle temperature is slightly lower, about 250 to 280°C. If the temperature is too high, the material may decompose; if the temperature is too low, the material will not have sufficient fluidity and cannot form fibers smoothly. Therefore, it is crucial to maintain temperature stability to prevent temperature fluctuations from negatively affecting fiber quality.

Pressure regulation is also an important factor affecting the production process. During the spinning process of MY10 series PBT, the spinning pressure usually needs to be maintained between 100 and 140MPa. Due to the relatively high melt viscosity of the material, a large pressure needs to be applied to ensure that the material passes smoothly through the spinneret hole to form fibers. The holding pressure is generally set to 60% to 80% of the injection pressure, and the holding time needs to be adjusted according to the thickness and length of the fiber, usually between 15 and 40 seconds. Reasonable pressure regulation can not only effectively reduce the shrinkage of the fiber, but also significantly improve the dimensional accuracy of the product.

In the selection of spinning speed, it is necessary to carefully balance production efficiency and product quality. Too fast spinning speed may cause shear heat in the fiber, thereby causing changes in material properties and increasing the risk of defects such as broken wires; while too slow speed will delay production progress and affect overall efficiency. Therefore, the spinning speed should be kept within a moderate range, and the specific value can be flexibly adjusted according to the actual production situation.