The reason why a dual-column dual-station screen changer must be installed horizontally is primarily based on its working principle and structural characteristics.

First, from the perspective of its working principle, the dual-column dual-station screen changer adopts a dual-column dual-channel design, with two screens operating simultaneously. While one station is undergoing a screen change, the other station can continue to operate, ensuring continuous production. This design makes the screen changing process more efficient, enabling screen changing without stopping the machine and without interrupting the material flow. Horizontal installation ensures more stable melt flow within the screen changer, reducing flow resistance or pressure fluctuations caused by improper installation angles.

Secondly, from a structural perspective, the dual-column dual-station screen changer has a robust structure capable of withstanding high operating pressures. Horizontal installation provides better support for the screen changer's weight, minimizing deformation or damage caused by gravitational forces. Additionally, horizontal installation facilitates maintenance and servicing of the screen changer, enabling operators to perform inspections, cleaning, and filter replacement with ease.

Furthermore, while horizontal installation is a common method for dual-column dual-station screen changers, the specific installation location must be determined based on factors such as the type of extruder, production line layout, and production requirements. In certain special cases, such as space constraints or production process requirements, alternative installation methods like inclined or vertical installation may be necessary. However, regardless of the installation method chosen, it is essential to ensure the screen changer functions properly and meets production requirements.

In summary, the horizontal installation of a dual-column, dual-station screen changer is primarily based on its working principle and structural characteristics to ensure the efficiency of the screen changing process and the continuity of production. At the same time, the specific installation method should be determined based on actual conditions.