Manual Spray Booth Retrofit for Plastic Parts
A 3C plastic parts manufacturer upgraded their existing manual spray booth with a robotic painting workstation, improving coating consistency and reducing labor dependency.
Background
A mid-size manufacturer in Southeast Asia producing plastic enclosures for consumer electronics relied entirely on manual spray painting. With 8–10 operators working two shifts, the factory faced growing challenges: difficulty recruiting skilled spray painters, inconsistent coating quality between operators and shifts, and increasing customer complaints about film thickness variation. The company wanted to automate but was concerned about the cost and disruption of installing a completely new line.
Customer Pain Points
Unstable manual spraying quality — film thickness variation of ±5μm across operators
High labor dependency with 10 manual spray painters, 2 of whom left every quarter
Paint utilization rate below 45%, resulting in significant material waste
Frequent rework due to runs, sags, and uneven coverage on complex geometries
Worker health concerns from prolonged VOC exposure in the spray booth
Proposed Solution
We proposed a phased retrofit approach: rather than replacing the existing spray booth entirely, we integrated a robotic painting workstation into the current setup. This included installing a 6-axis painting robot with automatic spray gun, upgrading the ventilation and filtration system, and implementing recipe-based process control for consistent spray parameters across all product types.
System Configuration
1x 6-axis painting robot with explosion-proof certification
Integrated electrostatic rotary bell atomizer
Automatic gun toggling with recipe-based parameter control
Part rotation fixture for complete 360° coverage
Upgraded exhaust filtration system (dry filter + activated carbon)
Touch-screen HMI with product recipe management
Ionizing air system for static elimination on plastic parts
Project Results
Coating consistency improved — film thickness variation reduced to ±2μm
Manual spraying work reduced from 10 operators to 3 (loading/unloading only)
Paint utilization improved from ~45% to ~68%
Rework rate dropped by approximately 60%
More stable production rhythm with consistent cycle times
ROI achieved within approximately 14 months
Suitable Applications
Plastic housings and enclosures for consumer electronics
Phone cases, tablet frames, and laptop shells
Small to medium batch production with multiple product types
Factories looking to automate existing manual spray booths
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