1. Immerse the pretreated profile into the bath solution for 2-5 minutes, lift the rack obliquely, drip the residual solution, dry it after two washes, and observe and test the chromizing effect of the profile surface. The chromized profile surface should be rainbow color.
　　
2. Drying: the drying temperature is 80-100 ℃, and the drying time is 10-15 minutes. The profiles dried until there is no liquid drop are hoisted into the drying oven for the specified time, and then hoisted to the lower row.
　　
3. Hanging: hang the profiles on the special spraying rack. The profiles of the same rack are required to be of the same type and specification. It is forbidden to hang profiles of different varieties on the same rack.
　　
4. Dust blowing: use 0.6-0.8Mpa compressed air to blow off the falling dust on the profile surface for the convenience of subsequent spraying operations.
　　
3、 Dusting
　　
1. Quality requirements of powder:
　　
Item Name Conductivity (Ω/cm) Particle size (μ m) Volatile matter (%)
　　
Requirements: 1010-1014 flat powder: 32-36; Yarn grain powder: 38-45 ≤ 0.5
　　
2. Precautions for spraying process operation:
　　
a. The gas shall be clean and dry, and it is forbidden to supply water, oil and other dirt;
　　
b. Recycle the powder to prevent pollution and deterioration;
　　
c. When changing powder, the powder room and powder bucket must be thoroughly cleaned to prevent different powders from polluting and mixing with each other;
　　
d. Polish the hanger to ensure good conductivity.
　　
4、 Curing: the temperature is 200 ± 10 ℃, and it is required to be slightly lower in the front and slightly higher in the rear. Curing time: 20-30 minutes.
　　
Control project voltage (KV) current (μ A) gun distance (mm) line speed (cm/mm) air pressure
　　
Control range 60-10025 Automatic gun 150-200
　　
Pistol 100-1502-3 Air supply pressure: 0.5-0.7Mpa
　　
Atomization pressure: 4-4.5pa
　　
Powder pressure 10-100pa
　　
5、 Quality control:
　　
Test item Surface quality Film thickness Glossiness Indentation Hardness Adhesion
　　
Control range Flat fabric 40-80 yarn texture fabric 40-90 Flat fabric 70 ± 10 High gloss fabric 80 ± 7 ≥ 800
　　
Operating Procedures for Spray Booth Equipment
　　
1. Power on the air compressor and cold gas turbine.
　　
2. Check whether the spray booth is clean, whether the powder color can permeate each other, and whether the powder buckets and small whirlwind devices are clean.
　　
3. Check whether manual and automatic guns and barrels are clean.
　　
4. Check whether the compressed air is clean and drain the filtered water frequently.
　　
5. Check whether the grounding wire of each equipment is in good condition.
　　
6. Select whether the lift program and front and rear positions are set within the correct range.
　　
7. Add the powder into the powder bucket, with a maximum of 25kg, otherwise the fluidized powder will overflow.
　　
8. Start the machine to fluidize for 30 seconds, and check whether the fluidization effect is slight and even.
　　
9. Adjust the amount of powder dispensed and the fan-shaped fog shape. The amount of powder dispensed should be between 60um and 100um.
　　
10. When adjusting the AC voltage, pay attention to the LEO display. If the section is complex, adjust the high voltage. Otherwise, adjust the low voltage if the section is simple. The voltage shall be controlled between 60 kW and 80 kW.
　　
Operating Procedures for Drying Oven Equipment
　　
1. When opening the electric cabinet and closing the power switch, attention should be paid to whether there is a sign prohibiting closing. If there is a sign, the tag holder must take it off before closing.
　　
2. Check whether the pressure of liquefied gas pressure gauge is 2mpa.
　　
3. Press the start switch to start the circulating fan.
　　
4. Press the start switch to start the smoke exhaust system, air curtain and combustion engine, and observe whether the combustion engine burns.
　　
5. Stop and check whether the temperature of each temperature control meter is 100~130 ℃.
　　
Operating Procedures for Curing Furnace
　　
1. Check whether the liquefied gas pressure gauge is normal.
　　
2. Start the circulating fan.
　　
3. Start the smoke exhaust system.
　　
4. Start the air curtain.
　　
5. Start 1 # and 2 # combustion engines and observe whether they burn.
　　
6. Check whether the temperature control meters rise normally. The temperature shall be controlled at 180~200 ℃.

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