➤Pre paintedGalvanized

 Steel Coils StructureTopFinishCoating

(PE/HDP/PVDF, etc.), 

When the thickness is above 20um, 

it can effectively prevent the damage of 

ultraviolet rays and 

harsh environments to 

the coating.

Primer CoatingSurface Treatment Layer

(Chromate Coating)

Metallic Coated Layer

 (Zn, AL, 55%AL+Zn)

Steel Substrate 

(Cold Rolled Steel Sheet)

Metallic Coated Layer 

(Zn, AL, 55%AL+Zn, Sn, Cr, etc.)

Surface Treatment Layer (Chromate Coating)

Back PrimerBack Finish Coating

(Epoxy, Polyester )

PPGI 

Coil Production

 ProcessUnrolling

 – Stitching machine – Entrance loop – Pretreatment – 

Initial coating – Bake – Cool down 

– Fine coating –

 Bake – Embossed film

 – Export loop – 

Inspection station – 

Cut – CoilingIn the above process,

 if the cleaning

degreasing process is not handled well, 

the adhesion of the primer of the color

 coated plate to the galvanized sheet is

not good, and it is easy to cause the 

topcoat of the color coated steel coil to fall 

off during the press forming process.

➤ Protective FilmThe protective 

film is a transparent or colored plastic 

film coated on the surface of 

the pre-painted galvanized steel coil. 

The purpose is to prevent scratches on the painted surface paint during cold roll forming. 

Our plastic film thickness is 30 microns, 

40 microns, 50 microns, 60 microns, and 80 microns.

➤Metallic coatingThe metallic coating of

 color coating for construction is 

hot-dip galvanized. 

The greater the thickness of the metallic coating, the better the corrosion resistance.

The thickness of the metallic coating mainly 

affects the cut corrosion performance of 

the pre-painted galvanized steel coils, 

and the influencing factors include the finish coating, primer, substrate thickness, 

and metallic coating thickness.We produce pre-painted steel coils

 for galvanized steel substrates with metallic coating of G40, G60, and G90. 

Please select the appropriate one according to the use environment.

Type Of CoatingsWe mainly use

 PE, SMP, and PVDF 

three kinds of 

coatings to produce 

PPGI Coil.

Polyester (PE) coating is suitable 

for ordinary

 residential roofing, 

the price is the cheapest, 

and it cannot withstand 

harsh environments. Silicone Modified Polyester (SMP)

 coating contains

 high weathering 

and super high weathering paints

 which can be applied in 

areas of

 high heat and cold, humid heat, 

and extreme cold. 

Polyvinylidene 

Difluoride (PVDF) coating has strong

 corrosion resistance, strong

 heat resistance, and the highest price.

 It is used in countries with humid heat, 

high temperatures, s and more rain.We work with beckers, Valspar, and Akzo.