1 Type of coating structure
2/1: Coat the top surface of the steel sheet twice, coat the lower surface once, and bake the sheet twice.
2/2: Coat the top/lower surface twice and bake twice.
2 Usage of different coating structures
2/1: The anti-corrosion property and scratch resistance of the single-layer backside coating is poor, however, its adhesive property is good. The prepainted steel sheet of this kind is mainly used for sandwich panel;
2/2: The anti-corrosion property, scratch resistance and processing property of the backside coating of prepainted steel sheet is better, so it is widely used for roll forming. But its adhesive property is poor, so it is not used for sandwich panel.
Category & Coding of Prepainted Steel Sheet:
Classification |
Item |
Code |
|
Application |
Constrution external use |
JW |
|
constrution internal use |
JN |
||
steel windows |
GC |
||
Household appliance |
JD |
||
Furnture |
JJ |
||
Others |
QT |
||
Surface finish |
Normal coated |
TC |
|
Embossed |
YA |
||
Printed |
YI |
||
Category of finish coatings |
PE |
PE |
|
High-durablity polyester |
HDP |
||
Silicon modified polyesters |
SMP |
||
Polyvinylidene fluoride |
PVDF |
||
Anti-static |
-- |
||
Easy-cleaning |
-- |
||
Base metal |
Electro-galvanized base metal |
DX |
|
Hot-dip zinc coated base metal |
Skin pass spangle |
RG |
|
|
No spangle |
RW |
|
Hot-dip zinc-aluminum coated |
LX |
||
Coating type |
Top surface |
Bottom surface |
|
Double coated |
Single coated |
|
|
Double coated |
Double coated |
|