Process Flow Diagram
The primary course of is the Preparation course of. On this course of, the car is pushed into the spray cubicles. The car is then sanded over the whole physique floor in order to make sure that all of the irregularities are eliminated and to additionally take away all uneven surfaces on the car’s physique in order to make sure that because the car is being sprayed with a brand new coat of paint, it spreads evenly over the whole floor of the car. This additionally completed in order to make sure that adhesion of the coat of paint of the car floor is improved so that a good ending paint coat is completed on the floor of the car which is sturdy and has superior floor end.
Secondly, the air spray weapons are ready. That is completed by pressurizing the paint within the hoses. This paint, is pushed on the nozzle throat the place it’s pressurized to an air strain of about 30 to 90 kilos per sq. inch. That is completed to make sure that the paint comes out as a twig on the nozzle. The spray on this type ensures that minimal paint is used and likewise a great floor end is completed on the car. Minimal paint utilization additionally means discount in paint emissions to the environment and thus air pollution can also be lowered.
Within the spraying course of, an electrostatic spraying mechanism is utilised. After the paint is pressurized to about 30-90 psi, it’s transformed into a twig on the nozzles these paint particles are charged electrostatically as these particles come out via the nozzle opening the physique floor additionally acquires an reverse cost to those particles by induction. Borrowing from the precept of expenses that in contrast to expenses entice, these particles fall on the car’s physique leading to a great and everlasting spray end.
The opposite course of is the face. Face is the world via which the consumption airflows within the spray portray cubicles. Within the sales space, there exists a portray cycle. To help this, the sales space is supplied with provide air followers and exhaust air followers. The provision air followers, transfer air from outdoors the store via a warmth exchanger after which via a system of filters after which into the spraying
Cubicles. The exhaust air followers however, exhaust air strikes via filters after which out of the cubicles (Heitbrink, 1995). This ensures that air emissions are lowered and likewise that the well being of the personnel working within the sales space is effectively taken care of. On this case there are numerous kinds of face areas relying on kind of sales space. A number of designs could also be adopted that’s Cross draft spray cubicles, Downdraft spray cubicles, Semi-Downdraft cubicles.
Within the case of my design I undertake a cross draft spray sales space. This as a result of they supply a clear working atmosphere and effectively take away over sprays from the sales space. On this technique, air enters via filters on the entrance of sales space and exhausted via filters behind the sales space (Heitbrink). It blows horizontally over the car to be painted. Exhaust filters effectively take away and acquire paint particles as they’re exhausted up via the exhaust stack.
Additionally a great Stack Designs was adopted for the spray cubicles. These stacks supply rain safety with out obstructing air stream that is consistent with sustaining air high quality emissions regulatory compliance for the ability. Spray particles emissions within the spray sales space ought to stream via this stacks. Since a few of the emissions could react with atmospheric moisture and result in the manufacturing of acidic rainfall equivalent to Sulphur dioxide and Nitrogen dioxide.
The final course of is the Drying course of. On this case, the ability makes use of heaters to hurry up the speed of drying of the paint coating on the car that is consistent with Texas Laws that the method of drying the paint on automobiles ought to be accelerated in order to minimise emissions into the atmosphere and in the long term shield it. After this the car is pushed out of the sales space. The sales space is then given a wash-down in order to take away any extreme paint that will have remained after the completion of the portray course of.
REFERENCES
– Texas Administrative Code on Environmental High quality, Texas Fee on Environmental High quality.(TCEQ)
– The Michigan Division of Environmental High quality (MDEQ) report on VOC and ES emissions
– TCEQ Regulatory Steerage – floor coating services – February 2011.
– Steerage on Emission to Environment Steerage be aware of 2004.
