The role and function of the screen changer in the production process of PVC sheets are mainly based on the following aspects:

1、 Filter impurities and improve product quality

The PVC raw material itself may contain impurities such as incompletely polymerized monomers and catalyst residues, and the impurity content in recycled plastics is even higher, such as labels, sediment, and other foreign objects. If these impurities enter plastic processing equipment, they will affect the quality of PVC sheets. The screen changer can effectively filter impurities in the melt through the filter screen on the filtering station, ensuring the purity of the plastic melt entering the mold, thereby improving the smoothness, uniformity, and pressure resistance of the product, making it more in line with market demand.

2、 Improve plasticizing effect and enhance product performance

After installing a screen changer, the back pressure of the machine head increases, which is beneficial for improving the plasticization and homogenization effect of raw materials. During the extrusion process of PVC sheets, the plasticizing effect directly affects the quality and performance of the product. The screen changer increases the back pressure of the machine head, allowing the raw materials to be more fully plasticized and homogenized during the extrusion process, thereby improving the texture and performance of the product.

3、 Avoiding product defects and improving overall quality

During the extrusion process of PVC sheets, product defects such as "winding patterns" may occur, which can affect the aesthetics and performance of the product. The application of screen changers can change the rheological behavior of materials. The "damping" effect of porous plates and filters can make the cross-sectional flow velocity of the melt more consistent, avoiding the occurrence of "polymer orientation" and laminar flow phenomena, and further improving the overall quality of the product.

4、 Improve production efficiency and reduce downtime

The screen changer significantly improves production efficiency through non-stop and fast screen changing technology. The hydraulic screen changer can perform screen changing operations without interrupting the production line, ensuring continuous operation of the production line, greatly reducing downtime, and improving production efficiency. At the same time, installing a screen changer is beneficial for removing water vapor and volatile substances from raw materials, reducing waste rates, and improving product qualification rates.

5、 Strong adaptability to meet diverse production needs

The screen changer is suitable for different types of PVC sheet extrusion production lines and can meet the production needs of products with different specifications and shapes. Its novel structure, high filtration efficiency, and automated screen changing process make the screen changer widely applicable in PVC sheet extrusion technology.

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