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800–1500 Tons/Month Automatic Anodizing Production Line for Aluminum Eyeglass Frames
Overview
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.
Technical Specifications
Parameter
Specification
Applicable Workpieces
Aluminum eyeglass frames, sunglass temples, spring hinges, and decorative eyewear components
Operation Mode
Fully automatic overhead flight-bar gantry crane with PLC encoder positioning
Anodizing Type
Type II Sulfuric Acid Anodizing + Organic Dyeing / Electrolytic Coloring + Nickel-Free Hot Sealing
Anodizing Stage: Type II Sulfuric Acid Anodizing (18–21°C, 1.0-1.5 A/dm2, target film thickness 5–12 μm) → Multi-stage Counter-Current Rinsing
Coloring Stage: Precision Organic Dyeing / Electrolytic Metal Salt Coloring → Rinsing
Sealing Stage: Non-Nickel Thermal Sealing (90–98°C, pH 5.5–6.5) → DI Water Hot Rinse
Drying & Unloading: Hot Air Drying Tunnel (60–80°C) → Inspection & De-racking
Key Features
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.
Production Line Configuration
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.
Frequently Asked Questions
What is the standard anodizing film thickness for aluminum eyeglass frames?
The standard anodic film thickness for aluminum eyewear components ranges from 5 μm to 12 μm. This thickness provides adequate corrosion protection and color absorption while ensuring that lens groove dimensions and micro-hinge assembly tolerances remain intact.
Why is nickel-free sealing required for aluminum eyewear anodizing lines?
Eyeglass frames remain in direct contact with human skin for extended periods. International standards such as ISO 12870 and REACH regulations limit nickel release to prevent allergic contact dermatitis. The line utilizes nickel-free organic or bismuth-based sealing chemistry to comply with skin-safety requirements.
Which aluminum alloys are best suited for anodized eyeglass frames?
Aluminum-magnesium-silicon alloys such as 6063 and 6061 are widely used due to their excellent response to chemical polishing and uniform dye acceptance. High-strength 7075 aluminum is also used for ultra-lightweight performance frames, requiring precise temperature control during anodizing.
How does the line handle small, lightweight eyeglass components without part floatation or rack marks?
The line utilizes custom titanium or aluminum spring-tension racks designed specifically for eyewear geometries. Positive spring clamping ensures continuous electrical contact and prevents component displacement caused by tank agitation or air sparging.
Customized Anodizing Line Solution
Get a Customized Aluminum Anodizing Line Layout and Process Solution. Submit your target monthly output (tons or frame pairs), frame alloy specifications, factory floor dimensions, and local environmental discharge limits to our engineering team for a full technical evaluation and line CAD layout.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2011
Total Annual:
430000-10000000
Employee Number:
50~90
Ecer Certification：
Verified Supplier
Guangdong MEI-AL Technology | Leading Anodizing Line Manufacturer Since 2011
MEI-AL Technology has been committed to serve the aluminum profile surface treatment industry with its strong technical force, excellent production and processing, scientific management methods and excellent m... Guangdong MEI-AL Technology | Leading Anodizing Line Manufacturer Since 2011
MEI-AL Technology has been committed to serve the aluminum profile surface treatment industry with its strong technical force, excellent production and processing, scientific management methods and excellent m...
