- Process introduction
In order to ensure painting quality, it is necessary to prepare the
workpiece before painting, to remove dirt, oil, grease, rust etc.
- Process stage (in normal case)
Stage
| Process
| Treatment method |
| 1 | Pre Clean
| High pressure water cleaning
|
| 2 | Hot water
| Dip + spray
|
| 3 | Pre-degreasing | Dip + spray
|
| 3 | Degreasing | Dip + spray
|
| 4 | Rinse #1
| Dip/Spray
|
| 5 | Rinse #2
| Dip/Spray
|
| 6 | Surface condition
| Dip
|
| 7 | Phosphating
| Dip/Spray
|
| 8 | Rinse #3
| Dip/Spray
|
| 9 | Rinse #4
| Dip/Spray
|
| 10 | DI Rinse
| Dip/Spray
|
- Design description
3-1 Treatment tunnel
The tunnel is a created of the profile steel structure that
supports the overhead conveyor system and which is then covers with
normal steel sheets.
• Drain decks are welded between the tanks. The decks slope towards
the tanks next.
The interior of the tunnel is fitted with suitable walkways for
maintenance operation.
3-2 Dip I Spray
The tanks are manufactured from SUS steel plate as specified and
are reinforced with profile steel.
The dip tanks are provided with fully dip the car body and where
heated is needed, combined with the heating circuits.
The tanks are equipped with water connections for initial fill-up
and draining.
The tanks are provided with an inclined bottom for drainage.
.
The heated tanks are provided with 50mm insulation.
3-3 Spray system
Horizontal centrifugal pumps will be used for all zones.
A ball valve is installed at the inlet and a butterfly valve on
outlet of the pump.
A diaphragm pressure gauge is provided at each pump on discharge
side. In the outlet with big pressure fluctuate, damp pressure
gauge will be installed.
The spray will operate when a car body is rising from the surface
of solution when it is needed.
Spray nozzles of the spray system have 2 type, spray nozzle & mist
spray nozzle, it is installed according to the process requirement.
The recirculation pipes for the heating section will be insulated
with 50mm thickness rockwool.
3-4 Waste water treatment
In the outlet of each circulation pump, there is a waste discharge
valve, connecting to the special waste discharge pipe of the paint
shop, the waste liquid will discharge to the waste water treatment
station for further treatment.
The drain pits of waste water treatment are connected to waste
water collection pit.
3-6 Solution level control
Automatic level controls are installed on all tanks, unless
otherwise specified.
- Advantage
- Design meet industrial and international standard
- Process flow reasonable, which can meet tack time requirement while
use less area.
- Economic investment
- High stability in lifetime and performance
- High automation
- Environmental friendly and energy saving
- Better film quality
