1. Efficient Screening: The left and right vibration motion helps to efficiently separate and classify the material being screened. As the material is fed onto the screen, the vibrations cause it to move in a linear motion across the screen surface. This movement allows for effective screening of the particles, ensuring proper separation based on size and shape.

2. Increased Throughput: The left and right vibration motion aids in increasing the throughput or capacity of the screening process. By moving the material in a controlled manner across the screen surface, more material can be processed within a given time frame. This is particularly important in industries where high production rates are required.

3. Improved Separation: The left and right vibration motion helps to prevent blinding or clogging of the screen mesh. When materials with high moisture content or fine particles are being screened, they can adhere to the screen surface and reduce the screening efficiency. The lateral vibration helps to dislodge and prevent these particles from sticking, ensuring continuous and effective separation.

4. Optimal Particle Flow: The left and right vibration promotes the ideal flow of particles on the screen surface. It minimizes the chance of particles getting trapped or clustering in one area, ensuring an even distribution across the screen. This uniform particle flow enhances the accuracy of the screening process and improves the quality of the separated fractions.

5. Reduced Screen Wear: The left and right vibration motion helps to distribute the load evenly on the screen surface, reducing localized wear and prolonging the screen's lifespan. By preventing concentrated force on specific areas, the vibrations ensure a more uniform wear pattern, leading to cost savings in screen maintenance and replacement.

Overall, the left and right vibration of a straight screen is a deliberate design feature that enhances the efficiency, throughput, and effectiveness of the screening process. It optimizes particle flow, prevents screen blinding, and promotes uniform wear, resulting in improved screening performance and higher-quality separated fractions.