The core role of material melting and measurement in melt spinning

1、 Material melting process

1. 1Melting mechanism of screw extruder‌

2. ·Solid polymer chips (such as polyester and polypropylene) are melted into a uniform viscous flow state melt through segmented heating and shear action of a screw extruder, and their temperature needs to be strictly controlled between the melting point and decomposition temperature to prevent degradation.

3. ·The screw spiral structure drives the melt to be transported to the spinning box, and maintains stable melt flow through segmented temperature control (heating/cooling) to avoid uneven composition caused by local overheating or cooling.

4. 2Melting quality control‌

5. ·In the direct spinning method, the polymerized melt is directly fed into the screw extruder to reduce the influence of intermediate links on the thermal stability of the melt; The slicing spinning method requires melting the pre crystallized and dried slices to improve the purity of the melt.

2、 Melt Measurement Technology

1. 1Accurate control of metering pumps‌

2. ·The metering pump (high-temperature gear pump) precisely adjusts the melt flow rate through gear meshing, with a flow range of 0.1-150cc/rev, ensuring fiber line density and uniformity.

3. ·The multi-layer and multi outlet metering pump can adapt to the needs of multi head spinning, simplify the transmission structure, and increase production.

4. 2Collaborative regulation of pressure and flow‌

5. ·The melt pipeline and distribution system evenly distributes the melt output by the metering pump to each spinning position, and adjusts the pump speed through real-time monitoring of fiber line density feedback to achieve dynamic calibration.

6. ·The spinning component is equipped with multiple layers of filtering materials (such as metal sand) to filter impurities and protect the metering pump and spinneret, while stabilizing the melt pressure gradient and reducing flow fluctuations.

3、 The synergistic relationship between melting and measurement

• The stable feeding of the screw extruder is a prerequisite for the precise measurement of the metering pump. If the melt temperature or pressure fluctuates, it will cause a decrease in the gear meshing efficiency of the metering pump, affecting the uniformity of the fibers.

• The high-pressure melt output by the metering pump further drives the extrusion molding of the nozzle hole, and its accuracy directly affects the fiber fineness and cross-sectional shape.

Material melting and metering, as key processes in melt spinning, ensure fiber quality and production efficiency through equipment collaboration and parameter optimization.