Ball mill for mixing and grinding the paint is a rotating drum with a hermetically closed the hatch through which you are loading and unloading. Full cover mills is impossible, since you have to maintain it at the top, bottom and middle positions of the hatch.
Load of dry pigment and binder are made by filling the top position of the hatch, unloaded - at the situation of the hatch, close to the bottom. Finally, the drum washing solvent (a rare operation) is performed with position openings close to the mean.
Movable slit sucking on the flexible hose, removable, depending on the location of the hatch (if not a rotating drum), did not prove. Exhaustion is obtained cumbersome it is difficult to rearrange the volume exhausted air is not enough. The only rational solution is stationary slotted pumps. These pumps are installed close to the hatch in its top - and bottom boot - unloading positions. Slotted semiring pumps are arranged in such a way as to prevent the rotation of the drum. Washing drum produced relatively rare, should be carried out at the position the hatch near the top.
Dilution gustotertyh paint solvents is usually performed in a vertical reactor equipped with a stirrer. Reactors have inspection hatches. Covers vehicles from the air is sucked in volume providing speed in opening the hatch from 0,5 to 0,7 m / sec, depending on the composition of the solvent.
Local exhaustion is also carried out on all the storage tanks and supplies from the measuring tanks. Tanks and measuring tanks have hatches for inspection, sampling by brushing. The volume of air exhausted is determined by the speed of opening the hatch, which should be somewhat lower than for reactors, namely, from 0,3 to 0,5 m / sec. With a significant number of tanks considered simultaneously open two hatches out of five. From tanks with closed hatches must be removed 30% of air exhausted from the tank with open hatches.
Packaging of finished products in metal cans is filling machines. Here we have a small amount of solvent vapors. Local exhaustion is organized in the form of cracks or craters, located close to kraskopodayuschego pipe. The volume of exhaust air, depending on the composition of the solvent - from 300 to 600 m3 / h for each machine. While filling a large container (over 5 kg) volume of the exhausted air should be increased and take in the range from 500 to 1000 m3 / h on the same machine.
In areas of packaging and packing cans, except for local suction, should be provided with an extract from the multiplicity of exchange between two to three per hour.
All premises kraskoterochnogo shop supply air must be supplied to the middle or upper area, preferably with the help of perforated panels. Supply plant should be located on the same spot, on which the premises served by them or below them. Fence supply air from the roof of the building is not recommended.
In the air, disposable systems, local exhaust ventilation, contains an appreciable amount of solvent vapors. Dust, by contrast, contains very little, except aspiration systems serving the path for the dry pigment. Cleaning the air of solvent vapors - complicated and expensive event: as a rule, it is not made. The foregoing obligation to output the exhaust pipes of ventilation systems as moleno higher above the roof of the building. Exhausts shall be flare at a rate of air output from the nozzle at least 20 m / sec. Must take into account the direction of prevailing winds and the location of nearby buildings, especially their air inlet.
Exhaust Centres recommended to place on floors or in the attic of the building. Room exhaust points should be isolated. Preferred mechanical general exchange extraction of these premises.