Polyethylene Gel Spinning Melt Pump

 

This analysis focuses on the selection of the CX-RT-6CC melt pump for polyethylene gel spinning operations, covering four dimensions: technical compatibility, key performance parameters, potential optimization directions, and operational suggestions, providing a reference for actual production:

 

I. Technical Compatibility Verification

 

Viscosity and Speed ​​Matching

Polyethylene gel has a viscosity of up to 1 million CP, classifying it as an ultra-high viscosity fluid. The CX-RT-6CC's operating speed range of 25-35 rpm (maximum 45 rpm) meets the requirements for low-shear conveying, preventing melt molecular chain breakage or localized overheating caused by high-speed rotation, thus ensuring consistent fiber strength.

 

Recommendation: In actual operation, 25-30 rpm is preferred. If fine-tuning of the flow rate is required, it can be gradually increased to 35 rpm, but melt temperature and pressure fluctuations must be monitored.

 

Temperature Resistance

 

The pump body and gears are made of high-temperature alloy steel, with a temperature resistance limit far exceeding 260℃. The stainless steel heating rod (1.2KW power) can rapidly heat up and maintain melt temperature uniformity, reducing viscosity fluctuations caused by temperature gradients.

 

Recommendation: Add a temperature sensor and a PID control system to provide real-time feedback on heating power and ensure temperature fluctuations ≤ ±3℃.

 

Pressure Bearing Capacity: The outlet pressure is 10-30 kg (approximately 1-3 MPa), while the pump's pressure bearing capacity reaches 35 MPa, providing ample safety margin to handle sudden pressure shocks (such as clogging of the spinning assembly).

 

Recommendation: Install a pressure transmitter at the pump outlet and set an overpressure alarm threshold (e.g., 28 MPa) to prevent system overload.

 

II. Key Performance Parameter Analysis

 

Flow Rate and Output Calculation: Output 6 mL/rpm, combined with the rotation speed range:

Minimum Flow Rate: 25 rpm × 6 mL/rpm = 150 mL/min (9 L/h)

Maximum Flow Rate: 35 rpm × 6 mL/rpm = 210 mL/min (12.6 L/h)

Applicability: Suitable for small to medium-scale spinning lines (e.g., single-head spinning machines). For higher flow rates, consider connecting two pumps in series or selecting a larger pump (e.g., 12 CC). Drive and Heating Efficiency

 

Drive Power 1.5KW: Compared to traditional high-pressure pumps (typically ≥3KW), energy consumption is reduced by more than 50%, suitable for long-term continuous operation.

 

Heating Power 1.2KW: When used with an insulation jacket, thermal efficiency can reach over 85%, reducing energy loss.

 

Structural Advantages

 

Vertical Drive: Reduces floor space, facilitates vertical docking with the extruder, and reduces the risk of melt residue.

 

Left In, Right Out: Conforms to the layout habits of most spinning lines, reduces pipe bends, and lowers pressure drop.

 

III. Potential Optimization Directions

 

Flow Rate Expansion Solutions

 

Series Pump Set: Two 6CC pumps are connected in series via a coupling, with the flow rate superimposed to 300-420mL/min, but system pressure matching must be ensured (total pressure remains 35MPa).

 

Variable Frequency Speed ​​Control: Stepless flow rate adjustment is achieved by fine-tuning the speed (e.g., 25-40rpm) using a frequency converter, but the motor's heat dissipation performance must be confirmed.

 

Sealing and Leakage Protection

 

Double-End Mechanical Seal: For high-temperature conditions, high-temperature resistant fluororubber or perfluoroether rubber sealing rings are used, along with cooling water flushing, to extend seal life.

 

Packing Seal + Flushing: If cost is a concern, graphite packing seals can be used, but regular grease injection maintenance is required.

 

Material Upgrade Options

 

Gear Surface Treatment: High-temperature alloy steel gears are nitrided or hard chrome plated to improve surface hardness (HRC≥60) and reduce wear.

 

Pump Body Bushing: A polytetrafluoroethylene (PTFE) bushing is added to the inner wall of the pump chamber to reduce the risk of melt adhesion and facilitate cleaning.

 

IV. Operation and Maintenance Recommendations

 

Pre-Start Inspection

Confirm that the heating rod wiring is correct and the temperature sensor calibration is complete.

 

Check the gear clearance (standard value 0.1-0.15mm) to avoid jamming due to thermal expansion.

 

Manually rotate the gear 3-5 times to confirm there is no jamming or abnormal noise.

 

Key Points for Operation Monitoring

 

Temperature: Record the melt temperature every 2 hours. If abnormal, immediately stop the machine and check the heating system.

 

Pressure: Monitor the inlet and outlet pressure difference (normal value ≤ 5MPa). A sustained increase may indicate filter blockage.

 

Noise: Operating noise should be ≤ 75dB. If a sharp friction sound occurs, stop the machine and check gear wear.

 

Regular Maintenance Plan:

Every 500 hours: Change the lubricating oil (high-temperature lithium-based grease recommended) and clean the filter.

Every 2000 hours: Disassemble the pump body and check gear wear and seal aging.

Every 5000 hours: Perform a complete machine balancing test to ensure vibration ≤ 3mm/s.

 

V. Summary: The CX-RT-6CC melt pump perfectly matches the requirements of polyethylene gel spinning in terms of core parameters such as viscosity, temperature, and pressure. Its low energy consumption, high precision, and easy maintenance significantly improve production stability. Further optimization of flow rate or extension of service life can be achieved by connecting pump sets in series, upgrading sealing materials, or surface treatment. 

 

If you have any specific questions regarding the selection and pricing of spinning pumps and melt pumps, please feel free to contact CIXIFM. Winny:
Email: sales01@cxflowmeter.com WhatsApp: 008618049841995