Single-Plate Hydraulic Four-Station Screen Changer for Plastic Strapping Production Lines
The single-plate hydraulic four-station screen changer serves as a critical filtration component in plastic strapping production lines (commonly processing PP, PET, and similar materials). Primarily designed to filter impurities from molten plastic while ensuring continuous production line operation, it significantly enhances strapping quality and production efficiency. Below are details regarding its specific applications:
Core Functions
Precise Impurity Filtration: Raw materials for plastic strapping may contain contaminants like dust, metal shavings, or agglomerated particles. This changer employs four independently cycling filter blocks to efficiently intercept such impurities. This prevents impurities from scratching extrusion dies or disrupting melt pump operation. It ensures smooth, uniform thickness in extruded strapping, enhances product strength, and prevents breakage during bundling caused by contaminants.
Ensuring Continuous Production: Traditional screen changes require shutdowns, reducing efficiency while causing material waste and inconsistent strapping performance due to temperature fluctuations. This equipment utilizes hydraulic drive to complete screen changes within seconds. With four positions cycling alternately, as one position withdraws for cleaning, a preheated standby position instantly takes over. This enables non-stop continuous production, significantly reducing output loss.
Outstanding Advantages for Production Lines
Addressing Heat-Sensitive Material Properties: PP, PET, and other strapping materials are prone to thermal degradation at high temperatures. This changer features a preheating station for filter blocks, ensuring the replacement filter matches the operating filter's temperature. This prevents low-temperature filters from entering the main flow channel and causing melt crystallization, thereby avoiding quality issues like crystalline spots and brittleness in strapping. Its venting structure also purges air from new filters, resolving common bubble defects in strapping production.
Suitable for High-Pressure, High-Temperature Conditions: Plastic strapping production involves high-temperature, high-pressure extrusion processes. Constructed from super-hard alloy materials with high-precision sealing structures, this screen changer withstands temperatures up to 300°C (580°F) and pressures up to 50 MPa (730 bar). It adapts to extreme production line environments while delivering superior sealing performance, preventing melt leakage that causes waste and safety hazards.
Reduces Production Losses: Its pre-filling function allows pre-prepared screens to expel air from the material before entering the main flow channel, minimizing scrap caused by bubbles or impurities. Simultaneously, minimal pressure fluctuations during screen changes prevent melt flow interruptions or sudden velocity changes, ensuring consistent strap dimensional accuracy and mechanical properties while reducing raw material waste.
Key Operational and Maintenance Points in Practical Application
Automated Convenient Control: The equipment is typically paired with a PLC or PID electronic control system, which can integrate pressure sensing and temperature control systems to automatically monitor melt pressure. When filter clogging causes pressure to exceed limits, the system can automatically trigger a screen change action or be manually operated, reducing labor intensity and adapting to production line automation requirements.
Targeted Maintenance for Extended Lifespan: Regularly inspect the cleanliness of hydraulic oil in the hydraulic station, as hydraulic system stability directly impacts screen-changing precision. The filter screen assembly features a detachable design, allowing individual removal for cleaning or replacement when clogged. Maintenance requires no disassembly of the entire equipment. The compact structure provides ample access space for repairs, minimizing maintenance downtime.
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