Huatao Lover Ltd Product Control Requirements
1. Material Control
Polyurethane Screens:
Prepolymer MDI/TDI + polyol mixing (CNC mixer, NCO content retest every 4hrs).
Metal skeleton: Sandblasted (Sa2.5), adhesive bonding strength ≥8MPa.
Stainless Steel Screens:
304/316 steel (Cr/Ni ratio 18/8), wire diameter tolerance ≤±0.05mm.
2. Process Control
Polyurethane:
Molding: 80-120℃/0.3-1.5MPa, vulcanization (150℃±3℃, 40min±5min).
Laser cutting: Hole size tolerance ≤±0.1mm.
Stainless Steel:
Laser cutting: ±0.05mm precision, burr-free edges.
Welding: Pulse welding (current 150-200A), seam strength ≥600MPa.
3. Surface Treatment
Polyurethane: Deburring, flatness ≤0.5mm deviation.
Stainless Steel: Electrolytic polishing (Ra ≤0.8μm), passivation (nitric acid, pH 1.5-2.5).
4. Testing Standards
Physical:
Polyurethane: Shore A 70-95, tensile strength ≥25MPa.
Stainless Steel: Tensile ≥600MPa, hole tolerance ≤±0.1mm.
Functional:
Vibration test (50-100Hz, 8hrs), penetration rate ≥95%.
Salt spray test ≥500hrs (stainless steel), wear resistance ≥200k cycles.
5. Final Inspection
100% visual check (no cracks/voids), 10% batch sampling for destructive testing.
Compliance: ASTM E11 (sieve), GB/T 5330-2025 (stainless steel).
