Before the painting construction, the necessary items for painting must be prepared. The necessary items for painting are paint and thinner, paint mixer, weighing equipment, spraying machine and supporting equipment, paint and coating testing equipment . In addition, the preparation of mortar spraying machine paint and machine debugging are also required.
First, the deployment of paint
1. Confirm the paint
Confirm the variety and quality of the paint according to the paint requirements, and correct the problems in time.
2. Adjust paint viscosity
Stir the paint well and measure the viscosity of the paint. If the viscosity is too high, diluent should be added to adjust the viscosity.
2. Installation and inspection of mortar spraying machine
1. Installation
Install and connect the components and auxiliary accessories of the prepared mortar spraying machine correctly.
2. Check
After the installation and connection of the mortar spraying machine is completed, enter the state to be sprayed. Before spraying, check whether the power source is operating normally, then suck in the paint, check whether the high-pressure paint cylinder is pressurized normally, whether the conveying hose leaks, whether the connection between the accessories is tight, and the spray gun And whether the filter is clogged, etc. Find faults and eliminate them in time.
3. Control of coating environmental conditions
Measure the temperature and humidity of the spraying environment, in line with the coating conditions, and it can be used for coating operations. Weather should also be taken into consideration for outdoor painting. During the period from spraying to the surface of the coating being dry, it should avoid rainy days and weather with high wind speed and heavy sand.
Operation Process And Main Points Of Mortar Spraying Machine
3. Painting operation
The coating operation is mainly a problem of the operation and use of the spray gun. Improper use of the spray gun will cause coating coating defects. The coating defects are mainly manifested in three aspects: First, the coating is uneven, mainly manifested as stubble marks , Inconsistent coating color, poor coating smoothness, etc. Second, the coating is too thick, mainly manifested as sagging, the surface of the coating is dry but the deep layer is not dry, and the phenomenon of coating skinning occurs. Third, the coating is too thin; the main performance is that the coating does not reach the required thickness after the conventional spray coating.
The operation of the spray gun should pay attention to three issues
1. Gun distance
The distance between the spray gun mouth of the mortar spraying machine and the surface to be coated is called the gun distance, and the gun distance is preferably 300 ~ 400mm. The gun distance is too small, the spray pressure is too large, and the recoil force is also large, which is prone to uneven coating, and the spray width (fan width) is small, which causes too much local spraying of the coated object and the coating film is too thick. If the gun distance is too large, the spraying pressure loss is large, the paint is easy to be scattered, and the spraying width is too large, so that the local sprayed material is too little, and the coating film cannot meet the thickness requirements.
2. Angle of spraying fan
The spraying fan surface and the surface to be coated should be perpendicular to each other. When manually operating the spray gun, it should be noted that the spraying width should not be too large, otherwise the angle of the spraying fan surface will change significantly due to the inconvenience of operation, resulting in uneven coating.
3. Running direction and speed of spray gun
The running direction of the spray gun should always be parallel to the surface to be coated and perpendicular to the surface of the spraying fan to ensure the uniformity of the coating. The operating speed of the spray gun should be stable, preferably 300 ~ 400mm / s. The running speed is unstable, the coating thickness is uneven, if the running speed is too fast, the coating is too thin, and if it is too slow, the coating is too thick.
