Prepainted Galvanized Steel Coil by Hannstar Industry in China

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Product Description

Product Description

PPGI is pre-painted galvanized steel, also known as prepainted galvanized steel coil , color coated steel etc.

PPGI Steel Coil Specification

Product Name	PPGI, Prepainted Galvanized Steel Coil
Technical Standard	AISI, ASTM, BS, DIN, GB, JIS3312
Material	SGCC/CGCC/TDC51DZM/TDC52DTS350GD/TS550GD/DX51D+Z
Thickness	0.13-1.20 mm
Width	600-1250mm
Zinc Coating	AZ30--AZ170, Z40--Z275
Color	all RAL Colors, or According to Customers Require/Sample
Coil ID	508/610mm
Top Side	Top paint: PVDF,HDP,SMP,PE,PU; Primer paint: Polyurethance, Epoxy, PE
Back side	Back paint:epoxy,modified polyester
Surface	Glossy (30%-90%) or Matt
Coil Weight	3-8 tons per coil
Package	Standard export package or customized
Hardness	soft (normal), hard, full hard(G300-G550)
T Bend	>=3T
Reverse Impact	>=9J
Pencil hardness	>2H
Salt Spray Resistance	>=500 hours

The total thickness of the pre-panted galvanized steel coil is composed of the base steel – coating -primer – top paint – protective layer thickness. The top paint thickness is 10-25μm, and the back paint thickness is 5-20μm. The thinner the base steel thickness, the higher the price of the ppgi steel coil, because the processing cost becomes higher.

Usually the paint coating material is polyester (PE) and the color of the back paint is white grey. The color can be customized according to the RAL color card or customer samples. Special patterns can be made, such as wood grain, flower print, camouflage, brick.

Production Line

Galvanized Steel Production Line

PPGI Production Process Flow Chart

ppgi-production-line-flow-chart.jpg.webp

Unrolling → Stitching machine → Entrance loop → Pretreatment → Initial coating → Bake → Cool down → Fine coating → Bake → Embossed film → Export loop → Inspection station → Cut → Coiling

In 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 top coat of the color coated steel coil to fall off during the press forming process.

PPGI & PPGL Sheet Coating Layer

Top (Finish) Coating (PE/HDP/PVDF, etc.)

Primer Coating

Pre Treatment (Chromate Coating)

Plating Layer (Zn, AL, 55%AL+Zn)

Base Metal (Cold Rolled Steel Sheet)

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

Pre Treatment (Chromate Coating)

Functional Painting (Epoxy, Polyester )

PPGI paint coating

Coating primer	Top paint coating	Service life(years)
1) Epoxy primer, good adhesion, water resistance, alkali resistance, chemical corrosion resistance, poor single toughness. 2) Polyester primer, good adhesion, good flexibility, sensitive to humid environment, chemical resistance is not as good as epoxy primer. 3) Acrylic primer, good adhesion, good toughness and high pretreatment requirements. 4) polyurethane primer, chemical resistance, abrasion resistance, durability, toughness	1) Polyester resin, good adhesion, molding and outdoor durability.	8-10
	2) Silicon Modified Polyester (SMP)	10-15
	3) High weather resistant polyester (HDP)	12-15
	4) Polyvinyl fluoride (PVC)	12-15
	5) Polyvinylidene fluoride/fluorocarbon (PVDF) It has good formability and color retention, good outdoor durability and powder resistance, solvent resistance, limited color and high price.	12-20

Quality Control

We have our own Physical & Chemical Testing Center Lab. to guarantee our product quality. Our test items & instrument fully meet international standards.