Pre-Painted Steel
Pre-Painted Steel Coil & Sheet
High-performance pre-painted galvanized steel designed for roofing, wall cladding, warehouses, industrial buildings and commercial construction projects worldwide.
Durable Color-coated Steel for Modern Construction
PPGI (Pre-painted Galvanized Iron) is produced by coating galvanized steel with high-quality paint systems through continuous roller coating and baking processes.
It combines excellent corrosion resistance, attractive appearance, lightweight structure and long-term durability, making it ideal for industrial and commercial applications.
- Excellent corrosion resistance
- Lightweight and easy processing
- RAL color customization support
- Long service life
- Suitable for roofing and cladding
Product Technical Parameters
| Product | PPGI Steel Coil / Sheet |
|---|---|
| Thickness | 0.12mm – 1.5mm |
| Width | 600mm – 1500mm |
| Coating Type | PE / SMP / HDP / PVDF |
| Paint System | 2/1, 2/2, 1/1 coating systems |
| Top Paint | 5+20 micron |
| Back Paint | 5–10 micron |
| Color | RAL Color / Customized |
| Surface | Glossy / Matte / Wood Grain / Pattern |
| Application | Roofing, Cladding, Garage Door, Warehouse |
PPGI Color Coating Process Flow
A continuous pre-painted steel process from substrate preparation to coating, curing, cooling and recoiling.
Continuous Color Coating Workflow
The PPGI line integrates substrate preparation, chemical treatment, primer coating, finish coating, curing, cooling and recoiling into one continuous production workflow.
Uncoiler
Steel coil is loaded and uncoiled to provide a continuous strip feed for the color coating line.
Welder
The tail of one coil is welded to the head of the next coil to keep the line running continuously.
Entry Looper
The entry looper stores strip length temporarily, allowing coil change and welding without stopping production.
Degreasing
Oil, dust and surface residues are removed from the steel strip before pretreatment and coating.
Pretreatment
Chemical pretreatment improves paint adhesion, corrosion resistance and long-term coating performance.
Primer Coating
Primer coating is applied to build a stable base layer and improve bonding with the finish coating.
Primer Baking Oven
The primer layer is baked and cured under controlled temperature to form a durable base coating.
Primer Cooling
The strip is cooled after primer baking to stabilize the coating before the finish coating stage.
Finish Coating
The finish paint layer is applied according to the required color, gloss, texture and coating system.
Finish Baking Oven
The finish coating is baked and cured to achieve required adhesion, durability and surface performance.
Finish Cooling
The coated strip is cooled after finish baking to stabilize the paint film and surface quality.
Exit Looper
The exit looper balances downstream speed and supports smooth continuous recoiling.
Recoiler
The finished pre-painted steel strip is recoiled into PPGI coils for packaging, storage and shipment.
Wide Range of Construction Uses
Strict Inspection Process
Every steel coil undergoes comprehensive inspection procedures including coating thickness testing, T-bend testing, impact testing, gloss measurement and adhesion testing.