Application of single screw co-Extrusion pvc profile extruder melt pump

The application of melt pumps in single-layer co-extrusion PVC profile extrusion machines is mainly manifested in the following aspects:

I. Pressure Boosting and Stabilization

As a positive displacement pump, one of the primary functions of the melt pump is to boost and stabilize the pressure of the high-temperature PVC melt coming from the extruder. In the process of single-layer co-extrusion of PVC profiles, the melt pump achieves pressure boosting by creating variations in its working volume through the intermeshing of its internal gears. Simultaneously, it stabilizes the melt pressure, ensuring a consistent flow rate into the extrusion die. This is crucial for enhancing the dimensional accuracy and surface quality of the extruded products.

II. Control of Pressure Fluctuations

During the extrusion process, factors such as pulsations in screw rotation speed, fluctuations in barrel and die temperatures, etc., often lead to pressure fluctuations in the melt. These fluctuations can not only impact the quality of the extruded products but also potentially damage the extruder. The gears in the melt pump act as a rotating barrier, effectively isolating the pressure fluctuations in the feed zone from affecting the discharge zone, thereby stabilizing the melt pressure fluctuations. This is of great significance in ensuring the uniformity and consistency of the extruded products.

III. Increased Production Capacity and Reduced Energy Consumption

By integrating the melt pump with the single-layer co-extrusion PVC profile extrusion machine, the overall efficiency of the production line can be significantly improved. On the one hand, the stable extrusion capability of the melt pump reduces waste and increases production capacity. On the other hand, as the melt pump stabilizes the pressure and flow rate of the melt, the extruder does not need to generate excessive pressure to meet production demands, leading to lower energy consumption. Additionally, the use of a melt pump can extend the lifespan of the extruder and reduce maintenance costs.

IV. Streamlined Production Process

By installing a melt pump and various extruder heads (such as for tubes, sheets, films) onto single-screw or co-rotating twin-screw extruders, the granulation process can be eliminated, allowing for direct extrusion of products. This system is particularly suitable for PVC profile extrusion scenarios requiring blending and modification. By simplifying the production process, it not only shortens the production cycle but also achieves energy savings and consumption reduction.

V. Improved Product Quality

The use of a melt pump further enhances the quality of PVC profile products. By stabilizing the pressure and flow rate of the melt, it significantly improves the dimensional accuracy and surface quality of the extruded products. Moreover, the melt pump reduces the shearing effect on the melt during extrusion, preventing degradation or defects such as bubbles caused by excessive shearing.

In summary, the application of melt pumps in single-layer co-extrusion PVC profile extrusion machines offers notable advantages and effects. Through pressure boosting and stabilization, control of pressure fluctuations, increased production capacity and reduced energy consumption, streamlined production processes, and improved product quality, melt pumps provide robust support for PVC profile extrusion production.

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