Spinning module precision controlled three roll traction machine

In wet spinning machines,Spinning module precision controlled three roll traction machine The function of high-precision traction equipment is more precise and complex compared to ordinary traction machines, and its core lies in the use ofHigh precision tension, speed, and synchronization controlTo achieve microstructure optimization and process stability improvement in fiber forming. Here are its key roles and technical details:

1. Ultra high precision tension control

• effect：

• Eliminate uneven stress inside fibersBy real-time monitoring and dynamic adjustment of traction tension (usually controlled within ± 1% error), fiber breakage, fuzz or micro cracks caused by excessive local stretching can be avoided.

• Improve molecular chain distributionA uniform tension environment enables polymer molecules to be arranged in a highly ordered manner along the fiber axis, enhancing the fiber's stabilitytensile strengthandModulus consistency(For example, the orientation degree of carbon fiber precursor directly affects the mechanical properties after carbonization).

• technical implementation：

• adoptServo motor+closed-loop feedback systemReal time adjustment of roller speed in combination with tension sensor.

• Multi stage roller segmented control (such as pre stretching, main stretching, and final shaping), with each segment independently adjusted to match the mechanical state of fibers at different stages.

2. Nanoscale speed synchronicity

• effect：

• Eliminate the fiber size deviation caused by speed fluctuationsThe synchronization error between the precision control tractor and the extrusion rate of the spinneret, as well as the reaction rate of the coagulation bath, can be controlled within 0.1% to ensure the uniformity of the fiber diameter (for example, the fluctuation of the fineness of medical fibers needs to be<± 2%).

• Adapt to complex process pathsIn multi-layer coagulation bath or segmented drying processes, the traction speed of different sections needs to be independently programmed (such as gradient acceleration/deceleration) to prevent fiber deformation due to sudden speed changes.

• technical implementation：

• Multi axis linkage control system (such as EtherCAT bus communication), achieving millisecond level response of each traction roller.

• Dynamic compensation algorithms (such as PID+feedforward control) are used to counteract the impact of mechanical inertia or load changes on speed.

3. Directional control of microstructure

• effect：

• Induced crystallization and phase separationBy precisely controlling the stretching ratio (such as gradually stretching from 1.5 times to 4 times in stages), the crystallinity, grain size, and pore structure of the fibers (such as the densification degree of PAN based carbon fiber precursor) can be regulated.

• Inhibit defect generation: In the process of fiber transformation from gel state to solid state, fine control traction can reduce surface wrinkles, core sheath structure separation and other defects (critical for applications such as high-performance filter fiber and battery separator).

• technical implementation：

• Real time feedback on fiber status and dynamic adjustment of process parameters through online detection methods such as laser calipers and ultrasonic testing.

• Temperature tension coupling control (such as introducing heating rollers in the hot stretching section to synchronously adjust temperature and stretching rate).

4. Compatibility with complex processes

• effect：

• Support for multi material systemsFor different spinning solutions (such as viscose, Lyocell, polyimide, etc.), the precision controlled traction machine can quickly switch preset process curves to meet diverse needs from flexible fibers to rigid fibers.

• Dealing with various working conditionsIn highly corrosive solidification baths (such as concentrated sulfuric acid/dimethylacetamide) or high-temperature environments, the sealing, corrosion-resistant materials (such as silicon carbide coated rollers), and thermal stability design of the traction machine ensure long-term operational accuracy.

• technical implementation：

• Modular design, supporting quick replacement of roller materials (ceramic, stainless steel) and surface treatments (anti stick coating).

• Environmental isolation technology (such as inert gas protection chambers) to prevent chemical vapor from corroding precision sensors.

summary

Spinning module precision controlled three roll traction machinepassPrecision electromechanical integration designandIntelligent control algorithmUpgrading the traction process of wet spinning from "macroscopic mechanical control" to "microscopic structural engineering" has solved the collaborative problem of "process accuracy product performance production efficiency" in high-performance fiber manufacturing, and is one of the core equipment in high-quality fiber industries such as aerospace, new energy, and biomedicine.