1. Spray hard foam polyurethane insulation material construction
Before the formal spraying operation, the trial spraying should be carried out. During the trial spraying, the air compressor should be turned on first, the compressed air switch should be turned on, and then the material pump of polyurethane hard foam
spraying machine should be started.
Adjust the discharge pressure of black material and white material, set the temperature of conveying pipe and heating system according to the site construction environment and base temperature, and make appropriate
adjustment according to the trial spraying situation.
The materials should be carefully injected into the black and white barrels for filtration. Check for leakage and blockage during material circulation.
Calibrate the flow of metering pump,
debug the proportional pump according to the required proportion, and the proportion error is not more than 4%.
In the process of material circulation, the discharge flow should be carefully observed. When the flow rate of material liquid is uniform
and continuous and the proportion of black and white material is normal, the trial spraying can be started.
During the construction, the minimum distance between the spray gun and the base is about 500mm, and the moving speed should be uniform.
The spraying sequence gradually moves from the lower air outlet to the upper air outlet, and the construction personnel face the lower air outlet and move backward.