The Core of Spinning Production Line: Micro-Manufacturing Code of the Molding Process

The efficient operation of spinning production line and the quality assurance of fiber products all depend on the core link - spinning molding process. This process is like a sophisticated and complex micro-manufacturing "symphony". Each step is closely coordinated and linked. Each note contains exquisite scientific principles and process skills to accurately shape the fiber morphology and performance that meet the needs. ​
Precisely controlled starting notes
The prelude to spinning molding is played by the precise delivery of spinning solution. Whether it is the spinning solution made by polymer and solvent in solution spinning, or the polymer melt formed by heating in melt spinning, stable and accurate transmission is the key. In the solution spinning system, the dissolution of fiber-forming polymers requires strict control of solvent type, concentration and temperature to ensure that the solution is uniform, stable and has good spinnability. As the core component of the solution delivery, the metering pump, with its precise mechanical structure and control system, delivers the spinning solution to the spinneret at a constant flow rate and stable pressure according to the production process requirements, laying the foundation for subsequent fiber molding. The precise control of flow and pressure in this process is like the conductor of an orchestra accurately grasping the rhythm, which is the key to the accurate start of the entire spinning "symphony". ​
Magical Variations at the Microscopic Scale​
When the spinning solution reaches the spinneret, the magical variation at the microscopic scale begins. The spinneret is made of high-precision alloy materials, and the surface is densely covered with spinneret holes with micron-sized apertures. These tiny channels are the starting point for the shaping of fiber morphology. The spinning solution is extruded from the spinneret hole under pressure, and the diameter changes instantly due to the orifice expansion effect. Then, under the action of the tensile force, the thin stream is quickly stretched and thinned, and gradually transformed into a fiber morphology. In melt spinning, the spinnerets of different shapes on the spinneret give the fiber different cross-sectional characteristics, and different cross-sections directly affect the fiber's gloss, feel, hygroscopicity and other properties. The spinneret is like a musical instrument in a symphony, giving the fiber a unique performance "gene" with a variety of "timbres", transforming the initial form of the spinning solution into a fiber prototype with specific properties.​
Harmonious symphony of solidification and molding
After the fiber prototype is formed, external environmental factors become the key symphony of fiber solidification and molding. Taking wet spinning as an example, the thin stream of stock solution extruded from the spinneret enters the coagulation bath, and the solvent and coagulant diffuse bidirectionally between the thin stream and the coagulation bath, causing the polymer concentration to increase until precipitation and solidification. The composition, temperature and flow rate of the coagulation bath, like the harmony in a symphony, play a decisive role in the quality of fiber molding. By adjusting these parameters, the microscopic characteristics of the fiber's cross-sectional shape and pore structure can be controlled, which in turn affects the fiber's macroscopic properties such as mechanical properties and adsorption properties. The synergistic effect of this environment and the thin stream of stock solution allows the fiber to complete the transition from liquid to solid at the microscopic level, just like the various musical instruments in a symphony cooperate with each other to perform a complete movement together. ​
The art of conducting in precision manufacturing
In the spinning production line, the precise control of process parameters is the art of conducting to ensure the harmonious performance of the "symphony". Parameters such as spinning temperature, spinning speed, stretching force and coagulation bath conditions are interrelated and affect each other. Any slight fluctuation may change the microstructure and macroscopic properties of the fiber. For example, the spinning temperature affects the fluidity and stability of the polymer. Too high a temperature may lead to degradation, while too low a temperature may affect the smoothness of spinning. The spinning speed and stretching force jointly determine the diameter and orientation of the fiber. To ensure the stability of the spinning process, advanced sensors and automatic control systems monitor various parameters in real time and make precise adjustments according to the preset process requirements, just like a band conductor controls the overall rhythm and balance, so that the spinning process is always in the best state and ensures the consistency and stability of fiber quality. The spinning process plays a core role in the spinning production line with its sophisticated and complex operating mechanism. From the precise control of the raw liquid delivery, to the micro-shaping of the spinning and shaping, to the environmental synergy of the solidification and shaping, and the precise command of the parameter control, each link follows scientific principles and integrates process wisdom to play the precise movement of fiber manufacturing together.