I. Core Equipment Maintenance
Screw System
Use gradual compression or long-barreled abrupt compression screws (L/D ratio 25:1-30:1, compression ratio 3:1) to avoid shear-induced overheating causing degradation or gels.
Inspect screw wear daily; lubricate ball screws weekly (Grease volume = thread clearance × 1.5).
Die & Screen Packs
Use 80-120 mesh screens to prevent impurity accumulation; replace regularly to avoid melt pressure instability.
Die design must be dead-space-free with sufficient land length. Inspect for residue monthly using a borescope and clean.
Drying System
Strictly dry raw materials (95-110°C / 3 hours). Excessive moisture causes melt degradation and viscosity issues.
Check dryer temperature stability daily; clean filter water traps weekly.
II. Process Parameter Monitoring
Temperature Control
Implement a “Low-High-Low” profile: Lower feed zone → Higher metering zone → Lower die lip temperatures to minimize degradation from prolonged high-heat exposure.
Excessively high die lip temperature risks insufficient melt strength; control near the material supplier’s recommended lower limit.
Cooling & Tension
Cooling rolls require multi-zone uniform cooling to prevent edge-center temperature differences causing film curling.
Calibrate tension control systems daily to ensure film flatness.
III. Preventive Maintenance Schedule
Daily: Clean machine body/control panels; check hydraulic/pneumatic systems and sensors for abnormalities (e.g., unusual noise, scratches).
Weekly: Deep clean guide rails; lubricate moving parts; calibrate camera positioning accuracy.
Monthly: Check coupling clearance (≤0.03mm) and belt tension (vibration <4mm/s); replace full-synthetic high-temperature grease.
IV. Raw Material & Environment Management
Maintain constant temperature and moisture prevention in raw material silos. Avoid moisture-laden TPU pellets causing degradation; optimize filler ratios experimentally to prevent uneven shrinkage.
Perform regular workshop dust removal, especially around drive components, to reduce equipment failure rates.
Critical Note: New equipment requires an intensified maintenance schedule during the first month (Twice-daily checks / Weekly maintenance every 3 days / Monthly maintenance every 15 days). Establish lubrication point diagrams to enhance maintenance efficiency. Preventive maintenance can reduce sudden failures by 80% and significantly extend equipment lifespan.
Post time: Aug-15-2025