Painting Line Upgrade for Appliance Components
A home appliance manufacturer upgraded their painting line to achieve more stable appearance quality and improved daily output for large panel components.
Background
A home appliance manufacturer producing refrigerator panels, washing machine covers, and AC housings needed to upgrade their aging painting line. The existing system could not deliver consistent surface finish quality across large panels, and production efficiency was low. With seasonal demand peaks requiring high output, the factory needed a solution that could maintain appearance quality while increasing throughput.
Customer Pain Points
Inconsistent surface finish on large appliance panels — visible orange peel and streaks
Low production efficiency — manual process could not meet seasonal demand peaks
Multiple color options for different appliance models causing frequent changeovers
Large panel sizes making manual spraying physically demanding and inconsistent
High reject rate for appearance defects — estimated 10–15% of production
Aging spray equipment with frequent breakdowns and maintenance issues
Proposed Solution
We designed a complete painting line upgrade covering automatic spraying, drying, and quality inspection workflow. The new system was engineered specifically for large appliance panels, with multiple robots working in coordination to cover wide surfaces. Quick color change capability and automated process control addressed the key production challenges.
System Configuration
Automatic conveyor system sized for large appliance panels
3x painting robots with coordinated coverage for wide panels
Automatic color change system with rapid flush cycle
IR + convection curing/drying oven with zone control
Online appearance inspection system (orange peel, streaks, defects)
Automatic loading/unloading stations for large panels
Paint supply system with viscosity and temperature control
Centralized PLC control with HMI and data logging
Project Results
More stable appearance quality — reject rate reduced from 10–15% to under 3%
Daily output improved significantly — approximately 2x increase in throughput
Consistent coating quality across all panel sizes and colors
Color changeover time reduced to support multi-model production
Labor reduced from 12 to 4 operators per shift
System reliability greatly improved vs. aging manual equipment
Suitable Applications
Refrigerator door panels and side panels
Washing machine tops and front panels
AC housings and microwave shells
Large appliance components requiring high-quality surface finish
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