PPGI & PPGL Production Line — PPGI.LTD
35,000 Tons Monthly Capacity | Continuous Color Coating Factory
Stable Supply for volume orders.
Strict Consistency per batch.
Reliable Lead Times for export.
Continuous Color Coating Workflow
4 Core Steps Ensuring Superior Paint Adhesion, Color Precision & Weatherability
01 Substrate Cleaning
Continuous degreasing and washing with chemical conversion to ensure optimal paint adhesion.
02 Primer & Curing
Double-sided primer roller application followed by primary high-temperature baking.
03 Color & Baking
Precision topcoat coating (PE/PVDF) with secondary baking for long-term weatherability.
04 Inspect & Recoil
Real-time film thickness and T-bend testing before seaworthy export rewinding.
Inside Our Factory: Step-by-Step Production Line
01. Uncoiling & Surface Pretreatment
High-Speed Uncoiling
Smooth uncoiling system to feed substrate steel into the line continuously.
Strip Stitching
Fast hydraulic stitching joins coil ends for non-stop production.
Alkaline Washing
Thorough surface cleaning to remove oil and impurities from the steel.
Chemical Conversion
Pretreatment layer applied to enhance corrosion resistance and paint adhesion.
02. Primer Coating & Curing
Top-Side Primer
Precision roller applies anti-corrosive primer evenly to the top surface.
Back-Side Primer
Simultaneous bottom-side primer coating for dual-sided protection.
Primary Baking
High-temperature oven cures the primer layer onto the steel substrate.
03. Topcoat & In-Line Customization
Topcoat Finish
Precision roller application of selected color coating (PE, PVDF, or HDP).
Secondary Baking
Final thermal curing locks in color, gloss, and outdoor weatherability.
Pattern Printing (Optional)
Precision roller printing for wood grain, brick, or decorative designs.
Protective Film (Optional)
Applies protective transparent film to prevent surface scratches during transport.
04. Inspection, Recoiling & Packaging
Surface Inspection
Continuous visual and physical inspection during high-speed running.
Tight Recoiling
Precision rewinding into clean, tight coils ready for seaworthy packaging.
Seaworthy Packaging
Standard export waterproof wrapping with steel strapping and eye protectors.
Custom Deep Processing Services
Embossing (Optional)
Mechanical roller embossing for textured surfaces like orange peel or diamond patterns.
Roofing Roll Forming (Optional)
Presses steel coils into corrugated or trapezoidal roofing and wall sheets.
Cut-to-Length Shearing (Optional)
Precision uncoiling and cutting into flat steel sheets per custom dimensions.
Coil Slitting Service (Optional)
Slits master steel coils into narrow strips for specialized manufacturing needs.
Strict Quality Control: 3-Step Inspection System
To ensure consistent quality before shipment, every steel coil undergoes a rigorous 3-step testing and verification process—from raw substrate to final dispatch.
Raw Material & Substrate Check
Verifying zinc coating layer, substrate thickness, and surface cleanliness before entering the coating line.
In-Line Surface & Quality Control
Continuous monitoring during production for color matching, surface smoothness, flatness, paint thickness, and T-bend performance.
Marking, Recoiling & Final Check
Clear inkjet marking, high-precision recoiling, seaworthy protective packaging, and final piece/weight verification before dispatch.
Buyer Concern (FAQ)
Q: Why do global buyers source steel coils directly from PPGI.LTD manufacturing facility?
A: PPGI.LTD supplies prepainted steel and aluminum coils directly from production lines to lower procurement costs and ensure quality control. Operating dedicated coating, slitting, and profiling units, PPGI.LTD provides custom paint thickness, precise width cutting, and 3-step quality testing with direct factory pricing.
Q: What customized manufacturing options are available for steel coil orders?
A: Custom manufacturing covers top and back paint coat thickness (PE, PVDF, HDP), standard RAL color matching, pattern printing (wood, brick, matt), coil width slitting from 600mm to 1250mm, and custom inner coil diameters (508mm or 610mm).
Q: What is the standard factory lead time for customized coil production?
A: Standard manufacturing lead time is 15 to 25 days upon order confirmation and deposit receipt. Lead time varies based on total tonnage, specialized paint resin availability, and custom color matching verification.
