Ứng dụng của máy bơm chân không vòng chất lỏng trong ngành công nghiệp nhựa

Liquid Ring Vacuum Pumps are essential equipment in the plastics industry, providing reliable vacuum solutions for various critical processes. Their ability to handle wet gases and vapors makes them particularly well-suited for this sector.

1. Plastic Pellet Production and Devolatilization

In the production of engineering plastics or compounding of recycled materials, the polymer melt often contains undesirable volatile components such as moisture, residual monomers, solvents, or low-molecular-weight oligomers. Liquid ring vacuum pumps are used in devolatilization extruders to create a high vacuum that forcibly removes these volatiles. This process is crucial for enhancing product purity, improving mechanical properties, and ensuring final product quality by preventing defects like bubbles and streaks.

2. Injection and Compression Molding - Mold Degassing

When molten plastic is injected into a mold, trapped air and gases released from the material itself can cause defects. Liquid ring vacuum pumps are connected to vents in the mold cavity to evacuate air immediately before injection. This application is vital for eliminating surface defects such as burn marks, short shots, and flow lines, resulting in high-gloss, flawless surfaces, especially for critical components like optical lenses or automotive parts.

3. Extrusion Processes - Melt Degassing

Similar to pellet production, vacuum degassing is employed during sheet, film, pipe, or cable extrusion. Liquid ring pumps are used in conjunction with vacuum sizing tanks or calibration units. They remove entrapped air and volatiles from the melt, ensuring precise product dimensions, excellent surface finish, and improved mechanical strength by achieving a dense, bubble-free structure.

4. Vacuum Thermoforming

This process involves heating a plastic sheet until pliable and then using vacuum force to draw it onto a mold. Liquid ring vacuum pumps provide the rapid and powerful suction required to accurately form the sheet into complex shapes, capturing intricate mold details. This is essential for manufacturing products like food packaging, refrigerator liners, and automotive interior panels.

Why Liquid Ring Vacuum Pumps are Ideal for the Plastics Industry:

Tolerance for Water Vapor and Moisture: This is their primary advantage. Plastic degassing generates significant water vapor and condensable gases. The pump's sealing liquid (typically water) can directly condense and absorb these contaminants without risk of pump damage, a common issue for dry pumps.

Robustness and High Reliability: Their simple design, with only one rotating impeller and no metal-to-metal contact inside the pumping chamber, ensures minimal wear and tear, allowing for continuous 24/7 operation.

Smooth and Quiet Operation: The compression process within the liquid ring is gentle, resulting in low vibration and noise levels, which improves the working environment.

Xử lý các luồng khí khó khăn: Mặc dù không dành cho môi trường nhiều bụi, nhưng chúng có thể xử lý các luồng khí có thể mang theo dấu vết của chất ngưng tụ nhựa hoặc oligome tốt hơn so với các máy bơm có khe hở bên trong chính xác.

Chi phí bảo trì tương đối thấp: Cấu trúc đơn giản giúp bảo trì dễ dàng, chủ yếu bao gồm thay chất lỏng làm kín thường xuyên và kiểm tra phớt cơ khí thường xuyên, giúp giảm chi phí phụ tùng thay thế.

Tóm lại, Bơm chân không vòng nước là thiết bị không thể thiếu trong ngành nhựa để đảm bảo chất lượng sản phẩm, hỗ trợ các quy trình phức tạp và nâng cao hiệu quả sản xuất từ ​​khâu chuẩn bị nguyên liệu thô đến khâu định hình cuối cùng. Độ tin cậy của chúng trong việc xử lý các quy trình ướt khiến chúng trở thành lựa chọn tiết kiệm chi phí và thiết thực để tạo ra môi trường chân không cần thiết.