Professional Zinc Alloy Surface Finishing Solutions
Barrel Painting
Barrel Painting
The advantages of barrel painting are more competitive than hand painting.
1. The "Universal Formula" (Mixing for Tumble)
Key Requirement
Thinner, slower-drying than hand paint; add anti-sticking agent. Viscosity Target: 12-14 Seconds (Ford Cup #4) Color Matching Key: Dry sample for comparison; record exact weight.
2. Barrel Painting Process
1. Sand Blasting
Automatic Sand Blasting Machine Barrel size:Φ60*110cm Machine size:120*120*186cm Process time:30-50KG/10 minutes RPM:25 Pressure:2-7kg/cm²
2. Degreasing & Polishing
Machines 1-Barrel Type Polishing Machine 2-Vibrating Type Polishing Machine 3-Whirlpool Type Polishing Machine 4-Automatic Whirlpool Type Polishing + Separating Machine 5-Centrifugal Type Polishing Machine 6-Product & Polishing Stone Separating Machine Materials 7-Round Shape Rough Polishing Stone 8-Triangle Shape Rough Polishing Stone 9-Derlin Coniform Shape Fine Polishing Stone 10-White Aluminum Round Refined Polishing Ball /Painting Stone 11-Porcelain Refined Polishing Stone 12-Aluminum and Porcelain Oblique and Round Column Refined Polishing Stone 13-Oil Cleaning/Degreasing Powder 14-Oil Cleaning/Degreasing Agent
If you want to know which machine and material are suitable for you, please send inquiry to us.
3. Phosphating & Cleaning
You can make the phosphorization by the machine or hand. If you make it by hand, you need to clean it. 1-Automatic phosphorization machine I. Tank Section II. Track Section III. Drum (non-conductive) IV. Transmission Section V. Crane VI. Electrical Control Section VII. Inlet and Drainage System 2-Phosphating Agent 25KG/barrel
4. Drying
1-Hot-wind Centrifugal Dryer (35KG)-Stainless steel inside and out I. Inner tank thickness: 3CM II. Bottom plate thickness: 3CM III. Net thickness: 1CM IV. Motor power: 0.75KW V. Heater power: 3KW Capcity: 30KG 2-Hot-wind Centrifugal Dryer (35KG)-The outside is iron, the inside is stainless steel I. Inner tank thickness: 3CM II. Bottom plate thickness: 3CM III. Net thickness: 1CM IV. Motor power: 0.75KW V. Heater power: 3KW Capcity: 30KG
5. Spray Painting with Barrel Painting Machine
Machines 1-Intelligent Barrel Painting Machine 2-Machine Painting Gun 3-Automatic Barrel Painting Machine Materials 4-Paint 5-Hardener 6-Thinner
3. Troubleshooting
4. Maintenance & Color Change
Spare Drum Strategy
Dedicated drums for different color series.
Gun Cleaning
Back-flush with thinner until clear.
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Workshop Planning Data
Barrel Painting — Data Zinc Alloy Finishing Managers Need
The painting line applies primer and topcoat by barrel spraying, rack spraying or cold spraying, then bakes to a durable finish with 100+ h salt spray, covering zinc alloy hardware in any RAL color.
600 m²Workshop Area
20 peopleTeam Size
220 kWInstalled Power
400-900k pcs/dayDaily Output (10 h)
Quality Inspection & Control
| Check item | Method | Acceptance standard |
|---|---|---|
| Film thickness | Coating thickness gauge | Primer 15-25 μm; topcoat 20-35 μm total 40-60 μm |
| Color match | Colorimeter ΔE | ΔE ≤ 1.0 vs approved RAL master |
| Adhesion | Cross-cut + tape | ISO 2409 rating 0-1 |
| Salt spray | NSS chamber | ≥ 100 h (with phosphating) |
| Bake cure | MEK rub test | No paint lift after 50 rubs |
| Appearance | Angle-light inspection | No orange peel, sagging, pinholes or overspray |
Workshop Layout & Floor Area
| Zone | Area |
|---|---|
| Pretreatment / phosphating | 110 m² |
| Spray booths (barrel + rack + cold) | 180 m² |
| Flash-off & curing ovens | 120 m² |
| Paint mixing / store | 60 m² |
| QA & color lab | 40 m² |
| Utility / compressed air | 50 m² |
| Packaging | 40 m² |
| Total workshop | 600 m² |
Manpower & Shift Plan
| Role | Headcount |
|---|---|
| Spray operators | 10 |
| Pretreatment operators | 3 |
| QC inspectors | 2 |
| Paint mixing technician | 1 |
| Oven / conveyor monitor | 1 |
| Supervisor | 1 |
| Maintenance | 1 |
| Packaging | 1 |
| Total (2 shifts × 10 h) | 20 |
Power & Utility Demand
| Equipment | Demand |
|---|---|
| Spray booths + extraction | 40 kW |
| Curing ovens (2 × 60 kW) | 120 kW |
| Air compressor | 22 kW |
| Conveyor / barrel drives | 15 kW |
| Paint pumps + mixer | 8 kW |
| Lighting & auxiliary | 15 kW |
| Installed total | 220 kW |
| Typical running load | ≈ 175 kW |
Production Flow Chart
PretreatmentDegrease → phosphate → dry
Load & MaskBarrel / rack / cold painting load
Primer CoatElectrostatic or air spray
Flash-off5-10 min solvent flash
TopcoatColor coat per RAL
Cure & QCBake 120-160 °C, inspect, pack
Daily Capacity — 10-Hour Operating Day
| Parameter | Value |
|---|---|
| Coating cycle | 40-70 min |
| Load per batch | 60-120 kg |
| Batches per 10 h day | 10-14 |
| Daily output | 400,000-900,000 pcs |
| Monthly output (26 days) | 10-23 million pcs |
Output Value Estimate
| Parameter | Value |
|---|---|
| Painting fee per piece | USD 0.008-0.02 |
| Daily output value (10 h) | USD 4,000-10,000 |
| Monthly output value | USD 104,000-260,000 |
| Annual output value | USD 1,250,000-3,120,000 |
Related Products — Complete Barrel Painting Solution
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