Coating apparatus – Projection or spray type – With hood or offtake for waste material
Patent
1992-07-16
1994-03-22
Jones, W. Gary
Coating apparatus
Projection or spray type
With hood or offtake for waste material
118634, 118 64, 118DIG7, 239104, 239288, B05B 1504
Patent
active
052960293
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for affecting the motions of gas-borne, especially air-borne, particles at a movable device, comprising an enclosure which encloses said device and is connected to a means for supplying or discharging a gas, such as air, to and, respectively, from said enclosure in such an amount that a positive pressure or a negative pressure is maintained therein.
In the first place, the invention relates to an arrangement for preventing paint particles from being deposited on a painting machine for spray painting e.g. a car body. In the second place, the invention relates to an arrangement for preventing the emission of dust particles from a manufacturing machine in what is generally referred to as a clean room for manufacturing e.g. electronic components.
The invention is, however, applicable also in many other fields.
DESCRIPTION OF THE PRIOR ART
Unfortunately, in spray painting of car bodies in a spray booth, paint particles adhere not only to the car bodies. A large amount of these particles accompany the ventilation air out of the booth, whereas a minor part of the particles adhere to painting machines or operators. The paint particles adhering to, for example, the painting machines will build up accumulations of paint particles thereon. In course of time these accumulations will grow and become so large and heavy that parts thereof come loose and are entrained by the ventilation air towards the floor of the spray booth and the car bodies advanced across the floor. There is a great risk that part of the dried paint particles falling down land on a car body and adhere to its not yet dry surface layer.
Owing to the high demands which consumers place on the quality of the surface layer of a car body, a few dry particles adhering to the surface layer are enough to necessitate extensive touch-up work, i.e. grinding and repainting of damaged parts of the surface layer, before the car body can be approved. Such touch-up work is both time-consuming and demands great resources, since in most cases manual work is involved.
In order to prevent the surface layer from being damaged, the painting machines must consequently be cleaned at such short intervals that no large and heavy accumulations of paint particles have time to form thereon. However, it is an inconvenient and time-consuming operation to clean the machines. To simplify the cleaning, the parts of the machines which are most subjected to paint deposit have recently become coated with a thin, gas-impermeable plastic film. As a result, a great part of the paint deposit occurs on the plastic films which must be replaced at certain intervals, for example 2-hour intervals, in order to prevent the formation of so large accumulations of paint particles on the plastic films that there is a risk that parts of the accumulations come loose from the plastic films and adhere to the surface layer of the car body. However, providing all painting machines with new plastic films several times during a working period is an operation which demands a great deal of work and is time-consuming as well as expensive. Besides, the parts of the machines which are less subjected to paint deposit and therefore are not coated still need to be cleaned. The reason why not the entire painting machines are coated with plastic film is that it will take longer to coat the entire machines than to clean the last-mentioned parts.
In the manufacture of electronic components, extremely high demands are frequently placed on the purity of the surrounding air. Certain components can be damaged even by very small particles. The manufacture therefore takes place in closed spaces which are known as clean rooms and to which finely filtered air is supplied. Unfortunately, some particles are also produced inside the clean room by the manufacturing machines and/or the people who are engaged in manufacturing the components. Consequently it is important that the particles present in the clean room are prevented as far as possible from contacting
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patent: 3741155 (1973-06-01), Hunder
patent: 3921576 (1975-11-01), Vertue
patent: 3951293 (1976-04-01), Schulz
patent: 4664061 (1987-05-01), Morioka et al.
patent: 4914752 (1990-04-01), Hinson et al.
Patent Abstracts of Japan, vol. 11, No. 63, C406, abstract of JP 61-222566, publ Mar. 10, 1986 (Nissan Shatai Co Ltd).
PCT International Publication No.: WO79/00478 (J. D. Toff) Jul. 26, 1979.
ABB Flakt AB
Jones W. Gary
Nguyen Dean T.
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