Semi-automatic hoist electrophoretic coating line
Semi-automatic hoist electrophoretic coating line
A defining engineering feature of this line is its tank geometry: all process tanks — pre-treatment, e-coat, and rinse stages — are designed as rectangular tanks with internal dimensions only marginally larger than the work hanger's swept volume. This tight-fitting design dramatically reduces bath volume compared to continuous flow-through tanks used in automatic lines. Less bath volume means less e-coat paint inventory, less pre-treatment chemical fill, lower heating energy consumption, and lower cost of bath maintenance and disposal — all directly reducing operating cost per unit produced.
The hoist mechanism transforms the physical handling of large, heavy workpieces from a two- or three-person manual operation into a controlled, single-operator task. By enabling precise entry angle control as the hanger swings into the e-coat bath, the hoist also delivers a key quality benefit unavailable on fixed-position automatic systems: air pockets trapped in cavities, blind holes, and complex internal geometries are displaced as the workpiece enters the bath at a controlled angle, guaranteeing complete surface coverage on even the most geometrically challenging workpieces. LEDE supplies this system as a complete,turnkey E-Coat Line.
Complete E-Coating Line Process Flow
LEDE supplies the complete semi-automatic electrophoretic coating line— pre-treatment tanks,e-coat tankwith rectifier,UF unit, pure water equipment, curing oven, and all auxiliary systems — as a fully integrated, turnkey package. Takingblack epoxy electrophoretic coatingfor iron workpieces as an example, the standard process sequence is:
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Process Stage |
Details |
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|
1 |
Loading |
Workpieces are mounted on hangers or racks at the loading station. Hanger geometry is customized for workpiece dimensions and e-coat coverage requirements. |
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2 |
Pre-Degreasing (Spray / Immersion) |
Alkaline degreaser removes bulk oils, lubricants, drawing compounds, and metalworking fluids. Bath temperature 50–65 °C. |
|
3 |
Main Degreasing |
Complete surface cleaning. Critical for downstream phosphating adhesion and e-coat film quality. |
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4 |
Water Rinsing |
One or more rinse stages remove degreaser residues. Final rinse uses DI water. |
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5 |
Surface Conditioning |
Titanium colloid activates the metal surface for uniform, fine-grained phosphate crystal nucleation. |
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6 |
Phosphating |
Zinc or iron phosphate conversion coating; 3–5× improvement in e-coat adhesion and corrosion resistance. |
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7 |
Pure Water Final Rinse |
DI water rinse ( |
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8 |
Electrophoretic Coating |
Motor-driven or hoist-controlled immersion in e-coat bath. DC voltage applied (50–400 V). Dwell: 1–2min. Uniform deposition on all surfaces. |
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9 |
UF Permeate Rinse |
Post-electrophoresis closed-loop rinse with UF permeate recovers > 90% of drag-out paint. |
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10 |
Curing Oven |
Workpieces baked at 180–190 °C for 20–30 min; e-coat film cross-links into a hard, corrosion-resistant finish. |
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11 |
Unloading & QC Inspection |
Finished workpieces unloaded, inspected for film thickness, adhesion, and surface quality. |
Process stages are engineered to your workpiece material, contamination profile, and coating quality specification. LEDE provides full process documentation and operator training for each project.
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