Single column screen changer for PC corrugated extrusion line

The single column screen changer can be used in PC corrugated extrusion line. Its features such as double-station alternating work, high temperature and high pressure resistance, and quick screen change can effectively meet the stringent requirements of impurity filtration, production continuity and product quality in the PC material extrusion process. The following is a specific analysis:

The core advantages of the single-column screen changer and the matching of PC corrugated sheet extrusion requirements

Dual-station alternating work to ensure continuous production

The PC corrugated board production line needs to run continuously to maintain stable molding temperatures and haul-off speeds. Conventional screen-changing stoppages can lead to deformation of the boards and a drop in light transmission. The single-column screen changer adopts a dual-filtering station design, where one station filters the melt while the other stands by. The hydraulic system realizes rapid switching within 0.5-2 seconds, with pressure fluctuations of<0.5MPa, ensuring the continuity of PC melt flow and avoiding brittle cracking of the sheet caused by temperature fluctuations.

Resistant to high temperature and high pressure, suitable for PC material properties

PC melting point of 220-260 ℃, extrusion temperature is usually controlled at 240-280 ℃, and high sensitivity to impurities. The main body of single-column screen changer is made of high-temperature alloy steel, with a maximum working temperature of 350℃ and a pressure resistance of 30-50MPa, which can stably filter the impurities of recycled materials such as paper scraps, aluminum foils, sand and gravels in the PC melt, and prevent the degradation of the melt due to the clogging of the filter screen.

Optimized flow channel design to reduce material residue

PC material is prone to thermal degradation due to long retention time, resulting in yellowing of the sheet and performance degradation. Single-column screen changer can optimize the flow channel through rheology, eliminate dead corners, ensure the smooth passage of melt, reduce residue, with high-precision screen (such as 200-400 mesh), can significantly improve the light transmission rate of PC sheet (from 85% to more than 92%) and weather resistance.

Typical application scenarios of single-column screen changer in PC corrugated extrusion

High proportion of recycled PC material

The proportion of PC recycled material can reach 30%-50%, but the impurity content is high. Single-column screen changer extends the life of the screen through graded filtration (coarse filter followed by fine filter). The case study of an enterprise shows that after using the duplex screen changer, the replacement cycle of the screen is extended from 4 to 12 hours, which saves 200,000 yuan in annual screen cost, and at the same time, reduces the scrap rate due to impurities (from 15% to less than 5%).

High value-added PC sheet production

Medical-grade and optical-grade PC sheets have extremely high purity requirements. The single-column screen changer can be integrated with a backwashing function to clean the screen through the melt backflow, extending the screen life to three times that of the traditional solution, reducing the interference of frequent screen changes on the production rhythm, and ensuring that the surface of the sheet is free of defects and the light transmission rate is stable.

Synergistic application with melt pump

In the precision molding production line of PC lampshade and corrugated board, single-column screen changer is often used in tandem with melt pump. After the screen changer filters the impurities, the melt pump provides stable pressure (fluctuation<0.1MPa) to ensure the uniformity of sheet thickness (error <0.05mm) to meet the demand of high-end market.

The single-column screen changer is the ideal choice for PC corrugated extrusion lines due to its features of high efficiency filtration, continuous production, and resistance to high temperature and pressure. It is recommended to give priority to the hydraulic drive, double-station, high-precision screen model, and pay attention to the synergistic design with the melt pump and extruder head to achieve the double optimization of quality and cost.