Compressed air from automation production lines contains dust, lubricating oil mist and odor impurities, which scratch 3C product surfaces, contaminate food raw materials and damage precision sensors if directly blown onto workpieces. Graded pneumatic filters are mandatory for air purification. Mismatched filter materials clog within one month on machine tool oil stations and reduce air supply pressure to slow down production cycle.
| Filter Material | Standard Filtration Precision | Cutting Fluid & Oil Resistance | Standard Service Life (Clean Air Source) | Main Captured Impurities | Forbidden Application Scenarios |
| PP Polypropylene | 5μm coarse filtration | Poor, swells and clogs under long oil mist exposure | 3 months in dry clean workshop | Solid dust, rust particles, sediment impurities | Machine tool stamping oil stations, high-temperature compressed air pipelines |
| Glass Fiber | 0.01μm precision oil separation | Excellent, resist penetration of machine oil & cutting fluid mist | 6 months on general industrial lines | Micron oil mist, mixed fine solid dust | Food dust-free lines (fiber shedding contaminates raw materials) |
| Column Activated Carbon | Adsorption type without fixed precision | Medium, saturated fast under heavy oil mist | 4 months ventilated normal temp lines | Compressed air odor, organic volatile matter, trace oil vapor | Heavy machine tools with continuous massive oil mist generation |
1. Machine tool stamping oil lines: Stage 1 PP coarse dust filter + Stage 2 glass fiber precision oil removal; activated carbon only for terminal auxiliary deodorization, check pressure differential monthly; 2. 3C electronic precision assembly lines: Dual-stage PP pre-filter + glass fiber fine filter; activated carbon is forbidden to prevent fiber scratch on precision housings; 3. Food packaging dust-free lines: Full food-grade PP filter combination without glass fiber & activated carbon to avoid fiber mixing into food raw materials; 4. Automatic painting lines: Full three-stage configuration, PP dust removal + glass fiber oil separation + activated carbon deodorization to guarantee smooth paint surface without particle pits.
1. Pressure differential standard: Replace filter immediately when filter gauge pressure difference ≥0.08MPa indicating full clog; 2. Replacement operation rule: Shut down air supply and release pressure before disassembling filter bowl, clean oil dirt inside filter cylinder, blow pipeline dust before installing new element; 3. Scheduled replacement cycle: PP every 3 months, glass fiber every 6 months, activated carbon every 4 months for dry clean workshops; cut cycle by 50% for oil-contaminated machine tools; 4. Spare filter storage: Keep sealed in moisture-proof cartons to prevent early pore clogging by dust.