High pressure airless sprayer operating points

Before painting, prepare the necessary items for painting. The necessary items for painting include paints and thinners, paint agitators, weighing tools, spraying machines and related equipment, paint and coating inspection instruments, etc. . In addition, the preparation of paints and the commissioning of machines are also required.

1. Preparation of paint

(1) Confirm coating

According to the coating requirements, confirm the type and quality of the coating and find that the problem has been corrected in time.

(2) Adjust the paint viscosity

Stir the paint thoroughly and measure the viscosity of the paint. If the viscosity is too high, the thinner should be properly adjusted to the proper viscosity.

2. Sprayer installation and inspection

(1) Installation

Properly install and connect the parts and auxiliary parts of the prepared sprayer.

(2) Inspection

Sprayer installation and connection is completed, into the state to be sprayed, before spraying to check whether the power source is operating normally, then inhale the paint, check whether the high pressure paint cylinder pressure is normal, whether the transmission hose leaks, accessories are tightly connected, spray gun and Whether the filter is clogged or not. Find faults and eliminate them in time.

(3) Coating environmental conditions control

Measure the temperature and humidity of the spraying environment, meet the painting conditions, and can perform coating operations. Outdoor coating should also take into account the weather, from the spraying to the coating surface dry for a period of time, should avoid the rainy days and high wind speed, sandstorm weather.

The coating operation is mainly the operation and application problems of the spray gun. Improper use of the spray gun can cause coating coating defects. The coating coating defects are mainly manifested in three aspects: First, the coating is uneven, and the main manifestation is the presence of joint marks. , coating color is inconsistent, coating smoothness is poor. Second, the coating is too thick, mainly manifested as sag phenomenon, the coating surface is dry and the deep layer does not dry, the phenomenon of coating crust. Third, the coating is too thin; the main manifestation is that the coating can not reach the required thickness after being coated by conventional spraying. The use of spray guns focuses on three issues.

Gun distance

The distance between the mouth of the spray gun and the object to be coated is called the gun distance, and the distance between the gun is 300 to 400 mm. The gun distance is too small, the spraying pressure is too large, the recoil force is also large, the coating unevenness is prone to occur, and the spray width (sector width) is small, so that the sprayed material is excessively sprayed locally and the coating film is too thick. The gun distance is too large, the spray pressure loss is large, the paint is easy to dissipate, and the spray width is too large, so that the sprayed material is too little locally, and the coating film cannot reach the thickness requirement.

2. Spray fan angle

Spraying the fan and the surface to be coated should be perpendicular to each other. When manually operating the spray gun, it should be noted that each spraying width should not be too large, otherwise the inconvenience caused by the operation will cause obvious changes in the angle of the spray fan, resulting in uneven coating.

3. Spray gun running direction and speed

The direction of the spray gun should always be parallel to the surface of the object to be coated and perpendicular to the spray fan to ensure the uniformity of the coating. The operating speed of the spray gun should be stable, preferably 300~400mm/s. The operating speed is unstable, the coating thickness is not uniform, the running speed is too fast, the coating is too thin, and the too slow coating is too thick.

When finishing or temporary paragraphs of painting construction, attention should be paid to finishing work.

1. Cleaning of spray equipment

The paint inside the machine is sprayed and then sprayed with solvent instead of paint to wash the paint in the machine's feeding pipeline and spray gun. When the discharged material is relatively clear, it can be. Then remove the gun and disassemble the easily dismantled parts for detailed cleaning with solvent. If you are spraying an aqueous coating, clean the machine and the spray gun with water.

2. Maintenance of spraying equipment

After cleaning the spray equipment, disassemble the parts that need to be dismantled, and use proper maintenance measures to handle the parts. For coating water, the maintenance of spray guns and nozzles is mainly used.

3. Coating and auxiliary equipment finishing

The remaining paint after use should be sealed and the auxiliary utensils (agitators, testing tools, weighing tools, etc.) should be cleaned and stored.

4. Inspection of coating quality

Coating quality inspection is the same as air spraying.