UV automatic coating processing technology to form small size mass production process automation, the use of automatic spraying, low temperature fast curing, high speed production line, selection of fast dry film, high gloss, good brightness, PU polyurethane coating fixation performance, mass production has bright appearance, good hand feeling, the cap shell parts.
1. upper material
The process flow of this set of painting production line is as follows
The operator in the work table top material area by hand will be half finished bottle cap, bottle and other parts of the fixture, through the transmission chain in turn through the production line of the various functional components.
2. Electrostatic dust removal
Because the plastic surface charge accumulation and air dust in the presence of charged particles, plastic surfaces tend to absorb large amounts of dust, the use of electrostatic precipitator in the work surface to form a high pressure negative ion flow field and the surface of the workpiece with high pressure air blowing, effectively remove dust and surface charge.
Through the flame treatment of the substrate through the transmission of the transmission chain into the spray chamber, the spray nozzle to its spray paint. At the same time the substrate by the forced rotation of the control system to produce rotation, so that the surface of the substrate to obtain a uniform coating.
4. Fast low temperature baking
After spray coating, substrate into the oven temperature to 60-70 Deg. C, bake for 1-2 minutes, the solvent reached 90%, coating resin cross-linking reaction, film hardening.
bottom coating by rapid low-temperature baking, film hardening, the substrate into the spray paint spray paint. Spray the same way with the bottom.
6. Baking paint
Finish the corresponding requirements baking baking time extended to 3 minutes, the film has a leveling process, and oven temperature should be uniform, the uniform of volatile solvent.
7. UV curing
UV is the abbreviation of Rays Ultraviolet English, namely ultraviolet light, ultraviolet (UV) is invisible to the naked eye, is a visible electromagnetic radiation was outside, usually in wavelength according to the nature of the different segments of the following section:
A vacuum ultraviolet (UV Vacuum), wavelength 10-200nm
B short wave ultraviolet (UV-C), wavelength nm 200-290
C ultraviolet (UV-B) wavelength, 290-320 NM
D long wave ultraviolet (UV-A), wavelength nm 320-400
E visible light (light Visible), wavelength nm 400-760
Ultraviolet (UV) for industrial health, the general use of long wave UV（UV-A）。
8. Cooling off the assembly line
The surface coating curing time is longer, the surface has a certain temperature, the film surface is too soft, so set up a cooling section, the ventilation flow away, the surface temperature of the paint film layer as soon as possible to harden, packaging line. After cooling the product from the conveyor chain to the next area, packaging line.