The prepainted steel sheet in coil is a product obtained by subjecting a hot-dipped galvanized steel sheet, an galvalume steel sheet, or an aluminum sheet to a surface chemical treatment (coating) , followed by baking and curing.
The decoiler machine unwinding, leveling, fixed length, cut the prepainted galvanized steel coil into a flat PPGI sheet of the required length and width and is processed into a PPGI&PPGL roofing sheet of various styles by a roll forming machine, such as corrugated steel sheet, wave tile, roman longtile profile.
The matt PPGI has big wrinkle PPGI and small wrinkle PPGI. The paint coating thickness is 20μm-45μm, which is used for roofing sheet which is not easy to discolor and has a longer service life.
Polyester color coated sheet in coil
It is coated on a metal sheet with a polyester coating and baked at a high temperature.
PVDF prepainted steel sheet in coil
It is coated on a metal plate with PVDF paint and baked at high temperature.
Brick pre-painted steel sheet in coil
The brick pattern is printed on a galvanized or galvalume steel sheet.
Marble color coated coil
The marble pattern is printed on a galvanized or galvalume steel sheet.
Matt Colour coated coil
Attached to a galvanized or galvalume steel sheet with a high performance polyester coating containing abrasive particles.
Camouflage color steel coil
Print camouflage patterns on galvanized or aluzinc steel sheets.
Wooden design prepainted steel coil
Print wood grain patterns on galvanized or aluzinc steel sheets.
HDP Colour coated steel coil
Attached to galvanized or galvalume steel sheet with high performance polyester coatings.
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 steel quality control according to the following:
|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|
Color coated steel coil/sheet (PPGI & PPGL) is widely used in:
|Material||CGCC, DX51D, Q195,Q235|
|Color||all RAL color, as Client's request|
|Paint||top paint- 10-30mic back paint-5-25mic|
|Paints||PE, SMP, HDP, PVDF|
|Surface||glossy and matt|
|Package||Standard export package|
|Hardness||Soft, hard, full hard|