800–1500 Tons/Month Automatic Anodizing Production Line for Aluminum Eyeglass Frames with Type II Sulfuric Acid Anodizing and Nickel-Free Sealing

This fully automatic anodizing production line is specifically engineered for precision surface treatment of aluminum alloy eyeglass frames and sunglass temples. Designed for delicate geometries and high tactile quality requirements, the system integrates micro-tolerance chemical etching, high-purity sulfuric acid anodizing (Type II), precision organic or electrolytic dyeing, and nickel-free sealing. With an optimal monthly throughput of 800–1500 tons (approximately 400,000–750,000 individual frame sets), this system ensures uniform oxide film growth, corrosion resistance, and skin-contact safety for premium eyewear manufacturing.

• Controlled Film Thickness: Voltage ramping and pulse current regulation maintain anodic coating growth between 5 μm and 12 μm, preserving tight mechanical tolerances for hinge screws, lens grooves, and rim wires.
• Automated Process Control: Central PLC system manages hoist velocity, flight-bar drip delays, and precise immersion timing across all chemical stations to eliminate human operational variance.
• Batch Color Consistency: Closed-loop color bath agitation, automated chemical dosing, and spectrophotometer-linked bath maintenance stabilize color shade reproduction across mass production lots.
• Temperature & Filtration Control: Dedicated titanium plate heat exchangers, industrial chillers, and 5 μm continuous solution filtration prevent thermal spikes and bath contamination in the oxidation tank.
• Flexible Surface Finishing: Multi-tank line layout allows rapid switching between high-gloss chemical polishing, satin matte etching, and specialized optical frame color palettes.

• Automated Gantry Flight-Bar Crane: Overhead hoist system with frequency-inverter drive, laser positioning sensors, and automated drip trays to prevent cross-tank contamination.
• PP-H & SS316L Process Tanks: Reinforced Polypropylene-Homopolymer (PP-H) tanks for acid/alkali baths and SS316L tanks equipped with thermal insulation for high-temperature sealing.
• IGBT DC Power Supplies: High-precision pulse rectifiers with ripple factor ≤ 2%, featuring programmable voltage-current step profiles.
• Chilling & Heat Exchanger System: Centralized chilling unit paired with external titanium heat exchangers for accurate electrolyte bath temperature maintenance.
• Exhaust & Air Scrubber Unit: Push-pull lateral lip exhaust hoods connected to a vertical polypropylene packed-bed wet scrubber for acid mist neutralization.
• DI Water & Filtration Skid: Two-stage Reverse Osmosis (RO) + Deionization (DI) water system integrated with continuous magnetic-drive filtration units for process baths.