I. Core Operational Stability Testing
1. Extrusion Output Stability Testing
Run continuously at full load for 8-12 hours, weighing the extruded molten material at fixed intervals. For excellent equipment, the output weight fluctuation rate should be controlled within ±3%.
Check the control accuracy of screw speed and traction speed; it should be within 0.1% to avoid uneven longitudinal wall thickness of the pipe caused by speed fluctuations.
2. Temperature Control System Stability Verification
During continuous operation, the temperature fluctuation of each section of the barrel should be controlled within ±3℃, with no frequent overheating or temperature drops, ensuring uniform plasticization of the raw material.
Focus on verifying the response speed of the heating coil and temperature control module to avoid material decomposition and surface defects in the product caused by temperature control lag.
II. Finished Product Quality Consistency Verification
1. Pipe Dimensional Accuracy Testing
Continuously sample and test the outer diameter and wall thickness of the pipe. The deviation of the outer diameter dimension should be controlled within the national standard allowable range, and the wall thickness uniformity fluctuation should not exceed ±5%.
After prolonged operation, the pipes exhibited no periodic vibration rings or excessive ellipticity, and the finished product qualification rate remained consistently above 98%.
2. Product Physical Performance Stability: The tensile strength, Vicat softening temperature, and longitudinal shrinkage rate of pipes from the same batch showed minimal fluctuations, with no instances of substandard batch performance.
For three-layer co-extrusion equipment, interlayer bonding strength and the precision of each layer's thickness control must consistently meet standards, with no localized thinning or delamination issues.
III. Long-Term Operational Reliability Assessment
1. Downtime Statistics: During a continuous 72-hour trial production period, the number of unplanned downtimes did not exceed one, with no frequent failures such as screw slippage or vacuum system malfunctions.
The core components of the equipment (gearbox, motor) exhibited normal temperature rise during operation, with no abnormal noises, oil leaks, or other potential hazards.
2. Energy Consumption and Load Performance: During full-load operation, the power consumption per ton of material remained stable without abnormal fluctuations, meeting the equipment's nominal energy-saving targets.
After prolonged high-load operation, the core components of the equipment showed no significant deformation or wear, ensuring a long service life.
IV. System and Supporting Equipment Reliability Verification
1. Stability of the Automated Control System
The PLC-based full-process control system operates smoothly without any lag, data loss, or false alarms. Remote monitoring and fault diagnosis functions are fully functional.
Each individual unit is grounded according to specifications, with no issues such as inaccurate length measurement or misaligned cutting caused by signal interference.
2. Manufacturer Qualifications and Case Studies
The equipment manufacturer possesses complete ISO9001 quality system certification and has long-term mass production benchmark cases of similar production lines, providing stable operation data from past customers as evidence.
Core components of the equipment (such as frequency converters and temperature control modules) use mainstream brands in the industry, ensuring high spare parts compatibility and reducing subsequent maintenance risks.
